Method for determining rock component content of low clay fine particle polymict rock and lithology interpretation method

Abstract

The application provides a rock component content determination method and a lithology interpretation method for low-clay fine-grained polymictic rocks. The lithology interpretation method comprises the following steps: based on the delta log R logging data, the compensated density logging data and the compensated neutron logging data of a target low-clay fine-grained polymictic rock layer section, combining a low-clay fine-grained polymictic rock rock component content determination model, determining the felsic content of the target low-clay fine-grained polymictic rock layer section; then combining a mathematical relationship model of the felsic content and the carbonate content of the low-clay fine-grained polymictic rock, determining the carbonate content of the target low-clay fine-grained polymictic rock layer section; based on the felsic content and the carbonate content of the target low-clay fine-grained polymictic rock layer section, determining the lithology of the target low-clay fine-grained polymictic rock layer section. The low-clay fine-grained polymictic rock rock component content determination model is a mathematical relationship model of the felsic content of the low-clay fine-grained polymictic rock and the delta log R data, the compensated density data and the compensated neutron data.

Description

Technical Field

[0001] This specification relates to the field of oil and gas exploration and development technology, and in particular to a method for determining the rock component content of low-clay fine-grained mixed sedimentary rocks and a method for interpreting the lithology of low-clay fine-grained mixed sedimentary rocks. Background Technology

[0002] Unconventional oil and gas resources, represented by shale oil and gas, are currently the focus of oil and gas exploration. In recent years, with the rapid advancement of tight oil and shale oil and gas exploration and development, fine-grained mixed sedimentary rocks have gradually become a hot topic in sedimentary research. Fine-grained mixed sedimentary rocks refer to sedimentary rocks with a particle size <0.0625mm containing more than 50% of the material. Currently discovered fine-grained mixed sedimentary rocks are mainly composed of terrigenous clastic particles such as clay (particle size <0.004mm) and silt (0.004-0.0625mm), or intrabasic carbonate and biogenic silica particles, characterized by "complex mineral composition, diverse lithology, and high organic matter abundance".

[0003] Low-clay fine-grained mixed sedimentary rocks (referring to fine-grained mixed sedimentary rocks with a clay content of no more than 10%) are developed to varying degrees in multiple basins. Their distribution is not only controlled by sedimentary environment and paleoclimate, but is also clearly related to volcanic activity, exhibiting extremely strong heterogeneity in both planar and vertical directions. Abundant oil and gas shows have been commonly observed in well drilling of low-clay fine-grained mixed sedimentary rock formations, but the production varies considerably. Compared to other types of fine-grained mixed sedimentary rocks, low-clay fine-grained mixed sedimentary rocks are characterized by "high felsic content + carbonate content (both generally exceeding 85%), virtually no clay, and widespread organic matter content." This unique mineral composition presents significant challenges to lithological interpretation. Furthermore, influenced by frequent changes in volcanic activity, water salinity, redox levels, and paleoclimate, lithology varies rapidly both vertically and horizontally. It typically exhibits an interlayered distribution of felsic materials, carbonates, and organic matter, resulting in over 20 different lithofacies, including laminated, layered, and massive structures, as well as laminated dolomitic tuff and layered tuff. Core data reveals significant differences in TOC, physical properties, oil-bearing capacity, and productivity among different lithofacies. Therefore, the accuracy of lithological identification directly determines the vertical and horizontal selection of shale oil "sweet spots."

[0004] Existing methods for identifying the lithology of fine-grained mixed sedimentary rocks generally rely on conventional well logging curves such as GR, RXO, and AC to calculate the content of major minerals. Based on the relative contents of clay, terrigenous clastics, and carbonate end-member components, they are classified into mudstone / shale, siltstone / fine sandstone, carbonate rocks, and transitional rocks among these three types. For low-clay fine-grained mixed sedimentary rocks, due to their unique mineral composition, there is currently no effective method for precise lithological evaluation, which severely restricts the evaluation and exploration deployment of this type of shale oil "sweet spot." Summary of the Invention

[0005] The purpose of this invention is to provide a technical solution that can quickly and effectively determine the rock component content and lithological interpretation of low-clay fine-grained mixed sedimentary rocks.

[0006] To achieve the above objectives, the present invention provides the following ten technical solutions.

[0007] In a first aspect, the present invention provides a method for determining the rock component content of low-clay fine-grained mixed sedimentary rocks, wherein the method includes:

[0008] Acquire ΔlogR logging data, compensated density logging data, and compensated neutron logging data for the target low-clay fine-grained mixed sedimentary rock interval;

[0009] Based on the ΔlogR logging data, compensated density logging data, and compensated neutron logging data of the target low-clay fine-grained mixed sedimentary rock interval, and combined with the rock component content determination model of the low-clay fine-grained mixed sedimentary rock interval, the felsic content of the target low-clay fine-grained mixed sedimentary rock interval is determined. Among them, the rock component content determination model of the low-clay fine-grained mixed sedimentary rock interval is a mathematical relationship model between the felsic content of the low-clay fine-grained mixed sedimentary rock and the ΔlogR data, compensated density data, and compensated neutron data.

[0010] According to a preferred embodiment of the first aspect, the method for determining the rock component content of low-clay fine-grained mixed sedimentary rocks further includes:

[0011] Based on the felsic content of the target low-clay fine-grained mixed sedimentary rock section, and combined with the mathematical relationship model between the felsic content and carbonate content of the low-clay fine-grained mixed sedimentary rock section, the carbonate content of the target low-clay fine-grained mixed sedimentary rock section is determined.

[0012] According to the preferred embodiment of the first aspect, the model for determining the rock component content of low-clay fine-grained mixed sedimentary rocks is as follows:

[0013] V 长英质 =β0+β1·C DEN +β2·C CN +β3·C △logR

[0014] In the formula: V 长英质 The fels content of low-clay fine-grained mixed sedimentary rocks is expressed in %; C DEN Compensated density logging data for low-clay fine-grained mixed sedimentary rocks, unit: g / cm³ 3 C CN Compensated neutron logging data for low-clay fine-grained mixed sedimentary rocks, unit: %; C △logR The ΔlogR logging data represents low-clay fine-grained mixed sedimentary rocks, with dimensionless units. β0, β1, β2, and β3 are coefficients that can be obtained by calibrating the rock composition data and logging data from the core section of the low-clay fine-grained mixed sedimentary rocks.

[0015] According to a preferred embodiment of the first aspect, the method for determining the rock component content of low-clay fine-grained mixed sedimentary rocks further includes: obtaining a model for determining the rock component content of low-clay fine-grained mixed sedimentary rocks;

[0016] Among them, the models for determining the rock component content of low-clay fine-grained mixed sedimentary rocks include:

[0017] Data on fels content, ΔlogR logging data, compensated density logging data, and compensated neutron logging data were obtained from the continuous core section of low-clay fine-grained mixed sedimentary rocks.

[0018] Based on the felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data of the continuous core section of the low-clay fine-grained mixed sedimentary rock, the mathematical calculation formula of the felsic content of the low-clay fine-grained mixed sedimentary rock with respect to the ΔlogR logging data, compensated density logging data, and compensated neutron logging data is fitted, which is the rock component content determination model of the low-clay fine-grained mixed sedimentary rock.

[0019] More preferably, based on the felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data of the continuously cored sections of low-clay fine-grained mixed sedimentary rocks, the mathematical formula for calculating the felsic content of the low-clay fine-grained mixed sedimentary rocks with respect to the ΔlogR logging data, compensated density logging data, and compensated neutron logging data is fitted, which is the rock component content determination model of the low-clay fine-grained mixed sedimentary rocks, including:

[0020] Based on fels content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data from continuous coring sections of low-clay fine-grained mixed sedimentary rocks, the cumulative probability curves of fels content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data from continuous coring sections of low-clay fine-grained mixed sedimentary rocks were determined.

[0021] Based on the cumulative probability curves of felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data of continuous coring sections of low-clay fine-grained mixed sedimentary rocks, the felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data corresponding to multiple cumulative probability quantiles were determined.

[0022] Based on the felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data corresponding to each cumulative probability quantile, the mathematical formula for calculating the felsic content of the low-clay fine-grained mixed sedimentary rock with respect to the ΔlogR logging data, compensated density logging data, and compensated neutron logging data is fitted, which is the rock component content determination model of the low-clay fine-grained mixed sedimentary rock.

[0023] According to the preferred embodiment of the first aspect, the mathematical relationship between the felsic content and carbonate content of low-clay fine-grained mixed sedimentary rocks is as follows:

[0024] V 碳酸盐 =α1V 长英质 +α0

[0025] In the formula: V 长英质 The fels content of low-clay fine-grained mixed sedimentary rocks, in %; V 碳酸盐 The carbonate content of low-clay fine-grained mixed sedimentary rocks is expressed in %; α0 and α1 are coefficients that can be obtained by calibrating the felsic content and carbonate content data of core samples from low-clay fine-grained mixed sedimentary rocks.

[0026] According to the preferred embodiment of the first aspect, the method for determining the rock component content of low-clay fine-grained mixed sedimentary rocks further includes: obtaining a mathematical relationship model between the felsic content and carbonate content of low-clay fine-grained mixed sedimentary rocks.

[0027] The mathematical model relating felsic content to carbonate content in low-clay fine-grained mixed sedimentary rocks includes:

[0028] Obtain felsic and carbonate content data from the core samples of the low-clay fine-grained mixed sedimentary rocks;

[0029] Based on the felsic and carbonate content data of the core samples from the low-clay fine-grained mixed sedimentary rocks, a mathematical formula for calculating the carbonate content of the low-clay fine-grained mixed sedimentary rocks with respect to the felsic content was fitted. This formula is the mathematical relationship model between the felsic and carbonate content of the low-clay fine-grained mixed sedimentary rocks.

[0030] Secondly, the present invention provides a lithological interpretation method for low-clay fine-grained mixed sedimentary rocks, wherein the method includes:

[0031] The felsic content and carbonate content of the target low-clay fine-grained mixed sedimentary rock section are determined using the rock component content determination method provided in the first aspect.

[0032] Based on the felsic and carbonate contents of the target low-clay fine-grained mixed sedimentary rock section, the lithology of the target low-clay fine-grained mixed sedimentary rock section was determined.

[0033] According to the preferred embodiment of the second aspect, the lithology of the target low-clay fine-grained mixed sedimentary rock section is determined by the following criteria:

[0034] When the fels content of the target low-clay fine-grained mixed sedimentary rock section is ≥75% and the carbonate content is ≤25%, the lithology of the target low-clay fine-grained mixed sedimentary rock section is defined as tuff.

[0035] When the felsic content of the target low-clay fine-grained mixed sedimentary rock section is less than 75% and greater than or equal to 50%, the lithology of the target low-clay fine-grained mixed sedimentary rock section is defined as dolomitic tuff (a transitional lithology between tuff and dolomite).

[0036] When the felsic content of the target low-clay fine-grained mixed sedimentary rock section is less than 50% but greater than 25%, the lithology of the target low-clay fine-grained mixed sedimentary rock section is defined as tuffaceous dolomite (a transitional lithology between tuff and dolomite).

[0037] When the fels content of the target low-clay fine-grained mixed sedimentary rock section is ≤25% and the carbonate content is ≥75%, the lithology of the target low-clay fine-grained mixed sedimentary rock section is determined to be dolomite.

[0038] Thirdly, the present invention provides an apparatus for determining the rock component content of low-clay fine-grained mixed sedimentary rocks, wherein the apparatus comprises:

[0039] Target Formation Data Acquisition Module: Used to acquire ΔlogR logging data, compensated density logging data, and compensated neutron logging data of the target low-clay fine-grained mixed sedimentary rock formation;

[0040] Fels content determination module: Based on the ΔlogR logging data, compensated density logging data, and compensated neutron logging data of the target low-clay fine-grained mixed sedimentary rock interval, and combined with the rock component content determination model of low-clay fine-grained mixed sedimentary rock, the fels content of the target low-clay fine-grained mixed sedimentary rock interval is determined. The rock component content determination model of low-clay fine-grained mixed sedimentary rock is a mathematical relationship model between the fels content of low-clay fine-grained mixed sedimentary rock and the ΔlogR data, compensated density data, and compensated neutron data.

[0041] According to a preferred embodiment of the third aspect, the device for determining the rock component content of low-clay fine-grained mixed sedimentary rocks further includes:

[0042] Carbonate content determination module: Based on the felsic content of the target low-clay fine-grained mixed sedimentary rock section, and combined with the mathematical relationship model between the felsic content and carbonate content of the low-clay fine-grained mixed sedimentary rock section, the carbonate content of the target low-clay fine-grained mixed sedimentary rock section is determined.

[0043] According to the preferred embodiment of the third aspect, the model for determining the rock component content of low-clay fine-grained mixed sedimentary rocks is as follows:

[0044] V 长英质 =β0+β1·C DEN +β2·C CN +β3·C △logR

[0045] In the formula: V 长英质 The fels content of low-clay fine-grained mixed sedimentary rocks is expressed in %; C DENCompensated density logging data for low-clay fine-grained mixed sedimentary rocks, unit: g / cm³ 3 C CN Compensated neutron logging data for low-clay fine-grained mixed sedimentary rocks, unit: %; C △logR The ΔlogR logging data represents low-clay fine-grained mixed sedimentary rocks, with dimensionless units. β0, β1, β2, and β3 are coefficients that can be obtained by calibrating the rock composition data and logging data from the core section of the low-clay fine-grained mixed sedimentary rocks.

[0046] According to a preferred embodiment of the third aspect, the device for determining the rock component content of low-clay fine-grained mixed sedimentary rocks further includes:

[0047] First model acquisition module: used to acquire a model for determining the rock component content of low-clay fine-grained mixed sedimentary rocks;

[0048] The first model acquisition module includes:

[0049] Continuous coring section data acquisition submodule: used to acquire felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data of continuous coring sections of low-clay fine-grained mixed sedimentary rocks;

[0050] The first model determination submodule is used to fit the felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data of the continuous core section of the low-clay fine-grained mixed sedimentary rock to obtain the mathematical calculation formula of the felsic content of the low-clay fine-grained mixed sedimentary rock with respect to the ΔlogR logging data, compensated density logging data, and compensated neutron logging data. This formula is the rock component content determination model of the low-clay fine-grained mixed sedimentary rock.

[0051] More preferably, the first model determining submodule includes:

[0052] Probability curve determination unit: used to determine the cumulative probability curves of felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data of continuously cored sections of low-clay fine-grained mixed sedimentary rocks based on felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data of continuously cored sections of low-clay fine-grained mixed sedimentary rocks;

[0053] The cumulative probability quantile corresponding data determination unit is used to determine the cumulative probability curves of felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data based on the cumulative probability curves of felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data of felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data corresponding to multiple cumulative probability quantiles.

[0054] The first model determination unit is used to fit the felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data corresponding to each cumulative probability quantile to obtain the mathematical calculation formula of felsic content in low-clay fine-grained mixed sedimentary rocks with respect to ΔlogR logging data, compensated density logging data, and compensated neutron logging data. This formula is the rock component content determination model of the low-clay fine-grained mixed sedimentary rocks.

[0055] According to the preferred embodiment of the third aspect, the mathematical relationship between the felsic content and carbonate content of low-clay fine-grained mixed sedimentary rocks is as follows:

[0056] V 碳酸盐 =α1V 长英质 +α0

[0057] In the formula: V 长英质 The fels content of low-clay fine-grained mixed sedimentary rocks, in %; V 碳酸盐 The carbonate content of low-clay fine-grained mixed sedimentary rocks is expressed in %; α0 and α1 are coefficients that can be obtained by calibrating the felsic content and carbonate content data of core samples from low-clay fine-grained mixed sedimentary rocks.

[0058] According to a preferred embodiment of the third aspect, the device for determining the rock component content of low-clay fine-grained mixed sedimentary rocks further includes:

[0059] The second model acquisition module is used to obtain the mathematical relationship model between the felsic content and carbonate content of low-clay fine-grained mixed sedimentary rocks.

[0060] The second model acquisition module includes:

[0061] Core data acquisition submodule: used to acquire felsic content data and carbonate content data of core samples from low-clay fine-grained mixed sedimentary rocks;

[0062] The second model determination submodule is used to fit the felsic content data and carbonate content data of the core sample of the low-clay fine-grained mixed sedimentary rock to obtain the mathematical calculation formula of the carbonate content data of the low-clay fine-grained mixed sedimentary rock with respect to the felsic content. This formula is the mathematical relationship model between the felsic content and carbonate content of the low-clay fine-grained mixed sedimentary rock.

[0063] Fourthly, the present invention also provides a lithological interpretation apparatus for low-clay fine-grained mixed sedimentary rocks, wherein the apparatus comprises:

[0064] The third aspect of the present invention provides a device for determining the rock component content of low-clay fine-grained mixed sedimentary rocks: used to determine the felsic content and carbonate content of a target low-clay fine-grained mixed sedimentary rock section;

[0065] Lithology Determination Module: Used to determine the lithology of the target low-clay fine-grained mixed sedimentary rock section based on the felsic and carbonate contents.

[0066] According to the preferred embodiment of the fourth aspect, the lithology of the target low-clay fine-grained mixed sedimentary rock section is determined by the following criteria:

[0067] When the fels content of the target low-clay fine-grained mixed sedimentary rock section is ≥75% and the carbonate content is ≤25%, the lithology of the target low-clay fine-grained mixed sedimentary rock section is defined as tuff.

[0068] When the felsic content of the target low-clay fine-grained mixed sedimentary rock section is less than 75% and greater than or equal to 50%, the lithology of the target low-clay fine-grained mixed sedimentary rock section is defined as dolomitic tuff (a transitional lithology between tuff and dolomite).

[0069] When the felsic content of the target low-clay fine-grained mixed sedimentary rock section is less than 50% but greater than 25%, the lithology of the target low-clay fine-grained mixed sedimentary rock section is defined as tuffaceous dolomite (a transitional lithology between tuff and dolomite).

[0070] When the fels content of the target low-clay fine-grained mixed sedimentary rock section is ≤25% and the carbonate content is ≥75%, the lithology of the target low-clay fine-grained mixed sedimentary rock section is determined to be dolomite.

[0071] Fifthly, embodiments of this specification also provide a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the method for determining the rock component content of low-clay fine-grained mixed sedimentary rocks provided in the first aspect.

[0072] In a sixth aspect, embodiments of this specification also provide a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the lithological interpretation method for low-clay fine-grained mixed sedimentary rocks provided in the second aspect.

[0073] In a seventh aspect, the present invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the method for determining the rock component content of low-clay fine-grained mixed sedimentary rocks provided in the first aspect.

[0074] Eighthly, the present invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the lithological interpretation method for low-clay fine-grained mixed sedimentary rocks provided in the second aspect.

[0075] In a ninth aspect, the present invention provides a computer program product comprising a computer program that, when executed by a processor, implements the method for determining the rock component content of low-clay fine-grained mixed sedimentary rocks provided in the first aspect.

[0076] In a tenth aspect, the present invention provides a computer program product comprising a computer program that, when executed by a processor, implements the lithological interpretation method for low-clay fine-grained mixed sedimentary rocks provided in the second aspect.

[0077] The technical solution provided by this invention can quickly and effectively determine the rock component content of low-clay fine-grained mixed sedimentary rocks, and can quickly and effectively interpret the lithology of low-clay fine-grained mixed sedimentary rocks. Using the technical solution provided by this invention, the fine determination of mineral content and automatic continuous lithology identification of low-clay fine-grained mixed sedimentary rocks can be effectively carried out. Comparison with the results of fine core description shows that the accuracy rate of lithology prediction for the well to be evaluated can reach over 85%. The technical solution provided by this invention not only provides sufficient basis for real-time lithology identification in drilling sites for low-clay fine-grained mixed sedimentary rocks, but also provides support for shale oil sweet spot evaluation and subsequent fracturing, reducing the cost of shale oil exploration and development. Attached Figure Description

[0078] To more clearly illustrate the technical solutions in the embodiments or prior art of this specification, the drawings used in the description of the embodiments or prior art will be briefly introduced below. The drawings described below are only some embodiments recorded in this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0079] Figure 1A This is a statistical chart of mineral content from whole-rock X-ray diffraction analysis of the continuously cored section of well LY1.

[0080] Figure 1B A triangular diagram showing the mineral composition classification of the continuous coring section of well LY1.

[0081] Figure 2 This is a graph showing the relationship between the long fels content and carbonate content in the continuous coring section of well LY1.

[0082] Figure 3 Histograms and cumulative probability curves of the frequency distribution of felsic and carbonate content in the continuous coring section of well LY1.

[0083] Figure 4 This is a cross-plot of the long fels content, carbonate content, and logging curves of the continuous coring section of well LY1.

[0084] Figure 5 The histogram of frequency distribution and cumulative probability curve of logging data from the continuous coring section of well LY1.

[0085] Figure 6 This is a graph showing the relationship between the long fels content and compensated density logging data, compensated neutron logging data, and ΔlogR logging data of the continuous coring section of well LY1.

[0086] Figure 7 This is a comparison chart of mineral content determined using the model in Example 1 and mineral content determined by core analysis. Detailed Implementation

[0087] The technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this specification, and not all embodiments. The specific embodiments described herein are only used to explain this disclosure, and not to limit this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure are within the scope of protection of this disclosure. In addition, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0088] This invention provides a method for determining the rock component content of low-clay fine-grained mixed sedimentary rocks, wherein the method includes:

[0089] Step S11: Obtain ΔlogR logging data, compensated density logging data, and compensated neutron logging data for the target low-clay fine-grained mixed sedimentary rock section;

[0090] Step S12: Based on the ΔlogR logging data, compensated density logging data, and compensated neutron logging data of the target low-clay fine-grained mixed sedimentary rock interval, and combined with the rock component content determination model of the low-clay fine-grained mixed sedimentary rock, determine the felsic content of the target low-clay fine-grained mixed sedimentary rock interval; wherein, the rock component content determination model of the low-clay fine-grained mixed sedimentary rock is a mathematical relationship model between the felsic content of the low-clay fine-grained mixed sedimentary rock and the ΔlogR data, compensated density data, and compensated neutron data;

[0091] Optionally, step S13: Based on the felsic content of the target low-clay fine-grained mixed sedimentary rock section, and combined with the mathematical relationship model between the felsic content and carbonate content of the low-clay fine-grained mixed sedimentary rock section, determine the carbonate content of the target low-clay fine-grained mixed sedimentary rock section.

[0092] In some embodiments, the model for determining the rock component content of low-clay fine-grained mixed sedimentary rocks is as follows:

[0093] V 长英质 =β0+β1·C DEN +β2·CCN +β3·C △logR

[0094] In the formula: V 长英质 The fels content of low-clay fine-grained mixed sedimentary rocks is expressed in %; C DEN Compensated density logging data for low-clay fine-grained mixed sedimentary rocks, unit: g / cm³ 3 C CN Compensated neutron logging data for low-clay fine-grained mixed sedimentary rocks, unit: %; C △logR The data represents the ΔlogR logging data for low-clay fine-grained mixed sedimentary rocks, with dimensionless units; β0, β1, β2, and β3 are coefficients that can be obtained by calibrating the rock composition data and logging data from the core section of the low-clay fine-grained mixed sedimentary rocks.

[0095] Furthermore, the model for determining the rock component content of low-clay fine-grained mixed sedimentary rocks is: V 长英质 =169.19-62C DEN +22.75C CN +12.80C △logR .

[0096] In some embodiments, the method for determining the rock component content of low-clay fine-grained mixed sedimentary rocks further includes:

[0097] Step S14: Obtain a model for determining the rock component content of low-clay fine-grained mixed sedimentary rocks;

[0098] The model for determining the rock component content of low-clay fine-grained mixed sedimentary rocks in step S14 includes:

[0099] Step S141: Obtain felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data from the continuous core section of low-clay fine-grained mixed sedimentary rocks;

[0100] Step S142: Based on the felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data of the continuous core section of the low-clay fine-grained mixed sedimentary rock, the mathematical calculation formula for the felsic content of the low-clay fine-grained mixed sedimentary rock with respect to the ΔlogR logging data, compensated density logging data, and compensated neutron logging data is fitted to obtain the rock component content determination model of the low-clay fine-grained mixed sedimentary rock.

[0101] Further, step S142, based on the felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data from the continuously cored sections of the low-clay fine-grained mixed sedimentary rock, fits the mathematical formula for calculating the felsic content of the low-clay fine-grained mixed sedimentary rock with respect to the ΔlogR logging data, compensated density logging data, and compensated neutron logging data. This formula constitutes the rock component content determination model for the low-clay fine-grained mixed sedimentary rock, which includes:

[0102] Step S1421: Based on the felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data of the continuous coring section of the low-clay fine-grained mixed sedimentary rock, determine the cumulative probability curves of the felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data of the continuous coring section of the low-clay fine-grained mixed sedimentary rock.

[0103] Step S1422: Based on the cumulative probability curves of felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data of the continuous coring section of low clay fine-grained mixed sedimentary rocks, determine the felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data corresponding to multiple cumulative probability quantiles;

[0104] Step S1423: Based on the felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data corresponding to each cumulative probability quantile, the mathematical calculation formula for the felsic content of the low-clay fine-grained mixed sedimentary rock with respect to the ΔlogR logging data, compensated density logging data, and compensated neutron logging data is fitted to obtain the rock component content determination model of the low-clay fine-grained mixed sedimentary rock.

[0105] Furthermore, in determining the felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data corresponding to multiple cumulative probability quantiles, the multiple cumulative probability quantiles include 2%, 10%, 30%, 50%, 70%, 90%, and 98%.

[0106] In some embodiments, the mathematical model relating felsic content to carbonate content in low-clay fine-grained mixed sedimentary rocks is as follows:

[0107] V 碳酸盐 =α1V 长英质 +α0

[0108] In the formula: V 长英质 The fels content of low-clay fine-grained mixed sedimentary rocks, in %; V 碳酸盐 The carbonate content of low-clay fine-grained mixed sedimentary rocks is expressed in %; α0 and α1 are coefficients that can be obtained by calibrating the felsic content and carbonate content data of the core samples from the low-clay fine-grained mixed sedimentary rocks.

[0109] Furthermore, the mathematical model for the relationship between the felsic content and carbonate content of the low-clay fine-grained mixed sedimentary rock is as follows: V 碳酸盐 = -0.9893V 长英质 +95.172.

[0110] In some embodiments, the method for determining the rock component content of low-clay fine-grained mixed sedimentary rocks further includes:

[0111] Step S15: Obtain a mathematical model relating felsic content and carbonate content in low-clay fine-grained mixed sedimentary rocks;

[0112] The mathematical model relating felsic content to carbonate content in the low-clay fine-grained mixed sedimentary rocks in step S15 includes:

[0113] Step S151: Obtain felsic content data and carbonate content data of the core sample from the low-clay fine-grained mixed sedimentary rock core section;

[0114] Step S142: Based on the felsic content data and carbonate content data of the core sample section of the low-clay fine-grained mixed sedimentary rock, the mathematical formula for calculating the carbonate content of the low-clay fine-grained mixed sedimentary rock with respect to the felsic content is fitted, which is the mathematical relationship model between the felsic content and the carbonate content of the low-clay fine-grained mixed sedimentary rock.

[0115] This invention provides a lithological interpretation method for low-clay fine-grained mixed sedimentary rocks, wherein the method includes:

[0116] Step S21: Obtain ΔlogR logging data, compensated density logging data, and compensated neutron logging data for the target low-clay fine-grained mixed sedimentary rock interval;

[0117] Step S22: Based on the ΔlogR logging data, compensated density logging data, and compensated neutron logging data of the target low-clay fine-grained mixed sedimentary rock interval, and combined with the rock component content determination model of the low-clay fine-grained mixed sedimentary rock, determine the felsic content of the target low-clay fine-grained mixed sedimentary rock interval; wherein, the rock component content determination model of the low-clay fine-grained mixed sedimentary rock is a mathematical relationship model between the felsic content of the low-clay fine-grained mixed sedimentary rock and the ΔlogR data, compensated density data, and compensated neutron data;

[0118] Step S23: Based on the felsic content of the target low-clay fine-grained mixed sedimentary rock section, and combined with the mathematical relationship model between the felsic content and carbonate content of the low-clay fine-grained mixed sedimentary rock section, determine the carbonate content of the target low-clay fine-grained mixed sedimentary rock section.

[0119] Step S24: Determine the lithology of the target low-clay fine-grained mixed sedimentary rock section based on the felsic and carbonate contents.

[0120] In some embodiments, the lithology of the target low-clay fine-grained mixed sedimentary rock section is determined by the following criteria:

[0121] When the fels content of the target low-clay fine-grained mixed sedimentary rock section is ≥75% and the carbonate content is ≤25%, the lithology of the target low-clay fine-grained mixed sedimentary rock section is defined as tuff.

[0122] When the felsic content of the target low-clay fine-grained mixed sedimentary rock section is less than 75% and greater than or equal to 50%, the lithology of the target low-clay fine-grained mixed sedimentary rock section is defined as dolomitic tuff (a transitional lithology between tuff and dolomite).

[0123] When the felsic content of the target low-clay fine-grained mixed sedimentary rock section is less than 50% but greater than 25%, the lithology of the target low-clay fine-grained mixed sedimentary rock section is defined as tuffaceous dolomite (a transitional lithology between tuff and dolomite).

[0124] When the fels content of the target low-clay fine-grained mixed sedimentary rock section is ≤25% and the carbonate content is ≥75%, the lithology of the target low-clay fine-grained mixed sedimentary rock section is determined to be dolomite.

[0125] In some embodiments, the model for determining the rock component content of low-clay fine-grained mixed sedimentary rocks is as follows:

[0126] V 长英质 =β0+β1·C DEN +β2·C CN +β3·C △logR

[0127] In the formula: V 长英质 The fels content of low-clay fine-grained mixed sedimentary rocks is expressed in %; C DEN Compensated density logging data for low-clay fine-grained mixed sedimentary rocks, unit: g / cm³ 3 C CN Compensated neutron logging data for low-clay fine-grained mixed sedimentary rocks, unit: %; C △logR The data represents the ΔlogR logging data for low-clay fine-grained mixed sedimentary rocks, with dimensionless units; β0, β1, β2, and β3 are coefficients that can be obtained by calibrating the rock composition data and logging data from the core section of the low-clay fine-grained mixed sedimentary rocks.

[0128] Furthermore, the model for determining the rock component content of low-clay fine-grained mixed sedimentary rocks is: V 长英质 =169.19-62C DEN +22.75C CN +12.80C △logR .

[0129] In some embodiments, the method for determining the rock component content of low-clay fine-grained mixed sedimentary rocks further includes:

[0130] Step S25: Obtain a model for determining the rock component content of low-clay fine-grained mixed sedimentary rocks;

[0131] The model for determining the rock component content of low-clay fine-grained mixed sedimentary rocks in step S25 includes:

[0132] Step S251: Obtain felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data from the continuous core section of the low-clay fine-grained mixed sedimentary rock.

[0133] Step S252: Based on the felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data of the continuous core section of the low-clay fine-grained mixed sedimentary rock, the mathematical calculation formula for the felsic content of the low-clay fine-grained mixed sedimentary rock with respect to the ΔlogR logging data, compensated density logging data, and compensated neutron logging data is fitted to obtain the rock component content determination model of the low-clay fine-grained mixed sedimentary rock.

[0134] Further, step S252, based on the felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data from the continuously cored sections of the low-clay fine-grained mixed sedimentary rock, fits the mathematical formula for calculating the felsic content of the low-clay fine-grained mixed sedimentary rock with respect to the ΔlogR logging data, compensated density logging data, and compensated neutron logging data. This formula constitutes the rock component content determination model for the low-clay fine-grained mixed sedimentary rock, which includes:

[0135] Step S2521: Based on the felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data of the continuous coring section of the low-clay fine-grained mixed sedimentary rock, determine the cumulative probability curves of the felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data of the continuous coring section of the low-clay fine-grained mixed sedimentary rock.

[0136] Step S2522: Based on the cumulative probability curves of felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data of the continuous coring section of low clay fine-grained mixed sedimentary rocks, determine the felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data corresponding to multiple cumulative probability quantiles;

[0137] Step S2523: Based on the felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data corresponding to each cumulative probability quantile, the mathematical calculation formula for the felsic content of the low-clay fine-grained mixed sedimentary rock with respect to the ΔlogR logging data, compensated density logging data, and compensated neutron logging data is fitted to obtain the rock component content determination model of the low-clay fine-grained mixed sedimentary rock.

[0138] Furthermore, in determining the felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data corresponding to multiple cumulative probability quantiles, the multiple cumulative probability quantiles include 2%, 10%, 30%, 50%, 70%, 90%, and 98%.

[0139] In some embodiments, the mathematical model relating felsic content to carbonate content in low-clay fine-grained mixed sedimentary rocks is as follows:

[0140] V 碳酸盐 =α1V 长英质 +α0

[0141] In the formula: V 长英质 The fels content of low-clay fine-grained mixed sedimentary rocks, in %; V 碳酸盐 The carbonate content of low-clay fine-grained mixed sedimentary rocks is expressed in %; α0 and α1 are coefficients that can be obtained by calibrating the felsic content and carbonate content data of the core samples from the low-clay fine-grained mixed sedimentary rocks.

[0142] Furthermore, the mathematical model for the relationship between the felsic content and carbonate content of the low-clay fine-grained mixed sedimentary rock is as follows: V 碳酸盐 = -0.9893V 长英质 +95.172.

[0143] In some embodiments, the method for determining the rock component content of low-clay fine-grained mixed sedimentary rocks further includes:

[0144] Step S26: Obtain a mathematical model of the relationship between felsic content and carbonate content in low-clay fine-grained mixed sedimentary rocks;

[0145] Among them, the mathematical relationship model between the felsic content and carbonate content of the low-clay fine-grained mixed sedimentary rocks in step S26 includes:

[0146] Step S261: Obtain felsic content data and carbonate content data of the core sample from the low-clay fine-grained mixed sedimentary rock core section;

[0147] Step S262: Based on the felsic content data and carbonate content data of the core sample from the low-clay fine-grained mixed sedimentary rock, the mathematical formula for calculating the carbonate content of the low-clay fine-grained mixed sedimentary rock with respect to the felsic content is fitted, which is the mathematical relationship model between the felsic content and carbonate content of the low-clay fine-grained mixed sedimentary rock.

[0148] This specification provides an apparatus for determining the rock component content of low-clay fine-grained mixed sedimentary rocks, as described in the following embodiments. Since the principle underlying this apparatus is similar to the method for determining the rock component content of low-clay fine-grained mixed sedimentary rocks, the implementation of this apparatus can refer to the implementation of the method for determining the rock component content of low-clay fine-grained mixed sedimentary rocks; therefore, repeated details will not be elaborated upon.

[0149] The device for determining the rock component content of low-clay fine-grained mixed sedimentary rocks provided in this embodiment of the invention includes:

[0150] Target Formation Data Acquisition Module 31: Used to acquire ΔlogR logging data, compensated density logging data, and compensated neutron logging data of the target low-clay fine-grained mixed sedimentary rock formation;

[0151] Fels content determination module 32: Based on the ΔlogR logging data, compensated density logging data, and compensated neutron logging data of the target low-clay fine-grained mixed sedimentary rock interval, and combined with the rock component content determination model of low-clay fine-grained mixed sedimentary rock, the fels content of the target low-clay fine-grained mixed sedimentary rock interval is determined; wherein, the rock component content determination model of low-clay fine-grained mixed sedimentary rock is a mathematical relationship model between the fels content of low-clay fine-grained mixed sedimentary rock and the ΔlogR data, compensated density data, and compensated neutron data;

[0152] Optionally, the carbonate content determination module 33 is used to determine the carbonate content of the target low-clay fine-grained mixed sedimentary rock section based on the felsic content of the target low-clay fine-grained mixed sedimentary rock section and a mathematical relationship model between the felsic content and carbonate content of the low-clay fine-grained mixed sedimentary rock section.

[0153] In some embodiments, the model for determining the rock component content of low-clay fine-grained mixed sedimentary rocks is as follows:

[0154] V 长英质 =β0+β1·C DEN +β2·C CN +β3·C △logR

[0155] In the formula: V 长英质 The fels content of low-clay fine-grained mixed sedimentary rocks is expressed in %; C DEN Compensated density logging data for low-clay fine-grained mixed sedimentary rocks, unit: g / cm³ 3 C CN Compensated neutron logging data for low-clay fine-grained mixed sedimentary rocks, unit: %; C △logR The data represents the ΔlogR logging data for low-clay fine-grained mixed sedimentary rocks, with dimensionless units; β0, β1, β2, and β3 are coefficients that can be obtained by calibrating the rock composition data and logging data from the core section of the low-clay fine-grained mixed sedimentary rocks.

[0156] Furthermore, the model for determining the rock component content of low-clay fine-grained mixed sedimentary rocks is: V 长英质 =169.19-62C DEN +22.75C CN +12.80C △logR .

[0157] In some embodiments, the apparatus for determining the rock component content of low-clay fine-grained mixed sedimentary rocks further includes:

[0158] First model acquisition module 34: used to acquire a model for determining the rock component content of low-clay fine-grained mixed sedimentary rocks;

[0159] The first model acquisition module 34 includes:

[0160] Continuous coring section data acquisition submodule 341: used to acquire felsic content data, ΔlogR logging data, compensated density logging data and compensated neutron logging data of continuous coring sections of low clay fine-grained mixed sedimentary rocks;

[0161] The first model determination submodule 342 is used to fit the felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data of the continuous core section of the low-clay fine-grained mixed sedimentary rock to obtain the mathematical calculation formula of the felsic content of the low-clay fine-grained mixed sedimentary rock with respect to the ΔlogR logging data, compensated density logging data, and compensated neutron logging data. This formula is the rock component content determination model of the low-clay fine-grained mixed sedimentary rock.

[0162] Furthermore, the first model determining submodule 342 includes:

[0163] Probability curve determination unit 3421: used to determine the cumulative probability curves of felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data of continuous coring sections of low-clay fine-grained mixed sedimentary rocks based on felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data of continuous coring sections of low-clay fine-grained mixed sedimentary rocks;

[0164] Cumulative probability quantile corresponding data determination unit 3422: used to determine the cumulative probability curves of felsic content data, ΔlogR logging data, compensated density logging data and compensated neutron logging data based on the cumulative probability curves of felsic content data, ΔlogR logging data, compensated density logging data and compensated neutron logging data of felsic content data, ΔlogR logging data and compensated density logging data of felsic content data, ΔlogR logging data and compensated neutron logging data of felsic content data, ΔlogR logging data and compensated density logging data of felsic content data, ΔlogR logging data and compensated neutron logging data of felsic content data, ΔlogR logging data and compensated density logging data of felsic content data, ΔlogR logging data and compensated neutron logging data of felsic content data, ΔlogR logging data and compensated density logging data and compensated neutron logging data of felsic content data, ΔlogR logging data and compensated density logging data and compensated neutron logging data of felsic content data, ΔlogR logging data and compensated density logging data and compensated neutron logging data of felsic content data, ΔlogR logging data and compensated neutron logging data of felsic content data, ΔlogR logging data and compensated density logging data and compensated neutron logging data of felsic content data, ΔlogR logging data and compensated neutron logging data based on the cumulative probability curves ...

[0165] The first model determination unit 3423 is used to fit the felsic content of the low-clay fine-grained mixed sedimentary rock with respect to the ΔlogR logging data, compensated density logging data, and compensated neutron logging data based on the felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data corresponding to each cumulative probability quantile. The mathematical calculation formula of the felsic content of the low-clay fine-grained mixed sedimentary rock with respect to the ΔlogR logging data, compensated density logging data, and compensated neutron logging data is the rock component content determination model of the low-clay fine-grained mixed sedimentary rock.

[0166] Furthermore, in determining the felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data corresponding to multiple cumulative probability quantiles, the multiple cumulative probability quantiles include 2%, 10%, 30%, 50%, 70%, 90%, and 98%.

[0167] In some embodiments, the mathematical model relating felsic content to carbonate content in low-clay fine-grained mixed sedimentary rocks is as follows:

[0168] V 碳酸盐 =α1V 长英质 +α0

[0169] In the formula: V 长英质 The fels content of low-clay fine-grained mixed sedimentary rocks, in %; V 碳酸盐 The carbonate content of low-clay fine-grained mixed sedimentary rocks is expressed in %; α0 and α1 are coefficients that can be obtained by calibrating the felsic content and carbonate content data of the core samples from the low-clay fine-grained mixed sedimentary rocks.

[0170] Furthermore, the mathematical model for the relationship between the felsic content and carbonate content of the low-clay fine-grained mixed sedimentary rock is as follows: V 碳酸盐 = -0.9893V 长英质 +95.172.

[0171] In some embodiments, the apparatus for determining the rock component content of low-clay fine-grained mixed sedimentary rocks further includes:

[0172] Second model acquisition module 35: used to acquire the mathematical relationship model between felsic content and carbonate content in low clay fine-grained mixed sedimentary rocks;

[0173] The second model acquisition module 35 includes:

[0174] Core data acquisition submodule 351: used to acquire felsic content data and carbonate content data of core samples from low-clay fine-grained mixed sedimentary rocks;

[0175] The second model determination submodule 352 is used to fit the felsic content data and carbonate content data of the core sample section of the low-clay fine-grained mixed sedimentary rock to obtain the mathematical calculation formula of the carbonate content data of the low-clay fine-grained mixed sedimentary rock with respect to the felsic content. This formula is the mathematical relationship model between the felsic content and carbonate content of the low-clay fine-grained mixed sedimentary rock.

[0176] This specification provides a lithological interpretation apparatus for low-clay fine-grained mixed sedimentary rocks, as described in the following embodiments. Since the principle underlying this apparatus is similar to the lithological interpretation method for low-clay fine-grained mixed sedimentary rocks, its implementation can be referenced from the implementation of the lithological interpretation method for low-clay fine-grained mixed sedimentary rocks; repeated details will not be elaborated further.

[0177] The lithological interpretation device for low-clay fine-grained mixed sedimentary rocks provided in this embodiment of the invention includes:

[0178] Target Formation Data Acquisition Module 41: Used to acquire ΔlogR logging data, compensated density logging data, and compensated neutron logging data of the target low-clay fine-grained mixed sedimentary rock formation;

[0179] Fels content determination module 42: Based on the ΔlogR logging data, compensated density logging data, and compensated neutron logging data of the target low-clay fine-grained mixed sedimentary rock interval, and combined with the rock component content determination model of low-clay fine-grained mixed sedimentary rock, the fels content of the target low-clay fine-grained mixed sedimentary rock interval is determined; wherein, the rock component content determination model of low-clay fine-grained mixed sedimentary rock is a mathematical relationship model between the fels content of low-clay fine-grained mixed sedimentary rock and the ΔlogR data, compensated density data, and compensated neutron data;

[0180] Carbonate content determination module 43: Used to determine the carbonate content of the target low-clay fine-grained mixed sedimentary rock section based on the felsic content of the target low-clay fine-grained mixed sedimentary rock section and the mathematical relationship model between the felsic content and carbonate content of the low-clay fine-grained mixed sedimentary rock section.

[0181] Lithology Determination Module 44: Used to determine the lithology of the target low-clay fine-grained mixed sedimentary rock section based on the felsic and carbonate contents.

[0182] In some embodiments, the lithology of the target low-clay fine-grained mixed sedimentary rock section is determined by the following criteria:

[0183] When the fels content of the target low-clay fine-grained mixed sedimentary rock section is ≥75% and the carbonate content is ≤25%, the lithology of the target low-clay fine-grained mixed sedimentary rock section is defined as tuff.

[0184] When the felsic content of the target low-clay fine-grained mixed sedimentary rock section is less than 75% and greater than or equal to 50%, the lithology of the target low-clay fine-grained mixed sedimentary rock section is defined as dolomitic tuff (a transitional lithology between tuff and dolomite).

[0185] When the felsic content of the target low-clay fine-grained mixed sedimentary rock section is less than 50% but greater than 25%, the lithology of the target low-clay fine-grained mixed sedimentary rock section is defined as tuffaceous dolomite (a transitional lithology between tuff and dolomite).

[0186] When the fels content of the target low-clay fine-grained mixed sedimentary rock section is ≤25% and the carbonate content is ≥75%, the lithology of the target low-clay fine-grained mixed sedimentary rock section is determined to be dolomite.

[0187] In some embodiments, the model for determining the rock component content of low-clay fine-grained mixed sedimentary rocks is as follows:

[0188] V 长英质 =β0+β1·C DEN +β2·C CN +β3·C △logR

[0189] In the formula: V 长英质 The fels content of low-clay fine-grained mixed sedimentary rocks is expressed in %; C DEN Compensated density logging data for low-clay fine-grained mixed sedimentary rocks, unit: g / cm³ 3 C CN Compensated neutron logging data for low-clay fine-grained mixed sedimentary rocks, unit: %; C △logR The data represents the ΔlogR logging data for low-clay fine-grained mixed sedimentary rocks, with dimensionless units; β0, β1, β2, and β3 are coefficients that can be obtained by calibrating the rock composition data and logging data from the core section of the low-clay fine-grained mixed sedimentary rocks.

[0190] Furthermore, the model for determining the rock component content of low-clay fine-grained mixed sedimentary rocks is: V 长英质 =169.19-62C DEN +22.75C CN +12.80C △logR .

[0191] In some embodiments, the apparatus for determining the rock component content of low-clay fine-grained mixed sedimentary rocks further includes:

[0192] First model acquisition module 45: used to acquire a model for determining the rock component content of low clay fine-grained mixed sedimentary rocks;

[0193] The first model acquisition module 45 includes:

[0194] Continuous coring section data acquisition submodule 451: used to acquire felsic content data, ΔlogR logging data, compensated density logging data and compensated neutron logging data of continuous coring sections of low clay fine-grained mixed sedimentary rocks;

[0195] The first model determination submodule 452 is used to fit the felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data of the continuous core section of the low-clay fine-grained mixed sedimentary rock to obtain the mathematical calculation formula of the felsic content of the low-clay fine-grained mixed sedimentary rock with respect to the ΔlogR logging data, compensated density logging data, and compensated neutron logging data. This formula is the rock component content determination model of the low-clay fine-grained mixed sedimentary rock.

[0196] Furthermore, the first model determining submodule 452 includes:

[0197] Probability curve determination unit 4521: used to determine the cumulative probability curves of felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data of continuous coring sections of low-clay fine-grained mixed sedimentary rocks based on felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data of continuous coring sections of low-clay fine-grained mixed sedimentary rocks;

[0198] Cumulative probability quantile corresponding data determination unit 4522: used to determine the cumulative probability curves of felsic content data, ΔlogR logging data, compensated density logging data and compensated neutron logging data based on the cumulative probability curves of felsic content data, ΔlogR logging data, compensated density logging data and compensated neutron logging data of felsic content data, ΔlogR logging data and compensated density logging data of felsic content data, ΔlogR ... based on the cumulative core section of felsic fine-grained mixed sedimentary rock.

[0199] Step S4523: Based on the felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data corresponding to each cumulative probability quantile, the mathematical calculation formula for the felsic content of the low-clay fine-grained mixed sedimentary rock with respect to the ΔlogR logging data, compensated density logging data, and compensated neutron logging data is fitted to obtain the rock component content determination model of the low-clay fine-grained mixed sedimentary rock.

[0200] Furthermore, in determining the felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data corresponding to multiple cumulative probability quantiles, the multiple cumulative probability quantiles include 2%, 10%, 30%, 50%, 70%, 90%, and 98%.

[0201] In some embodiments, the mathematical model relating felsic content to carbonate content in low-clay fine-grained mixed sedimentary rocks is as follows:

[0202] V 碳酸盐 =α1V 长英质 +α0

[0203] In the formula: V 长英质 The fels content of low-clay fine-grained mixed sedimentary rocks, in %; V 碳酸盐 The carbonate content of low-clay fine-grained mixed sedimentary rocks is expressed in %; α0 and α1 are coefficients that can be obtained by calibrating the felsic content and carbonate content data of the core samples from the low-clay fine-grained mixed sedimentary rocks.

[0204] Furthermore, the mathematical model for the relationship between the felsic content and carbonate content of the low-clay fine-grained mixed sedimentary rock is as follows: V 碳酸盐 = -0.9893V 长英质 +95.172.

[0205] In some embodiments, the apparatus for determining the rock component content of low-clay fine-grained mixed sedimentary rocks further includes:

[0206] Second model acquisition module 46: used to acquire the mathematical relationship model between felsic content and carbonate content in low clay fine-grained mixed sedimentary rocks;

[0207] The second model acquisition module 46 includes:

[0208] Core data acquisition submodule 461: used to acquire felsic content data and carbonate content data of core samples from low-clay fine-grained mixed sedimentary rocks;

[0209] The second model determination submodule 462 is used to fit the felsic content data and carbonate content data of the core sample section of the low-clay fine-grained mixed sedimentary rock to obtain the mathematical calculation formula of the carbonate content data of the low-clay fine-grained mixed sedimentary rock with respect to the felsic content. This formula is the mathematical relationship model between the felsic content and carbonate content of the low-clay fine-grained mixed sedimentary rock.

[0210] This specification also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the method for determining the rock component content of low-clay fine-grained mixed sedimentary rocks provided in this embodiment of the invention.

[0211] This specification also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the lithological interpretation method for low-clay fine-grained mixed sedimentary rocks provided in this embodiment of the invention.

[0212] This specification also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the method for determining the rock component content of low-clay fine-grained mixed sedimentary rocks provided in this embodiment of the invention.

[0213] This specification also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the lithological interpretation method for low-clay fine-grained mixed sedimentary rocks provided in this embodiment of the invention.

[0214] This specification also provides a computer program product, which includes a computer program that, when executed by a processor, implements the method for determining the rock component content of low-clay fine-grained mixed sedimentary rocks provided in this embodiment of the invention.

[0215] This specification also provides a computer program product, which includes a computer program that, when executed by a processor, implements the lithological interpretation method for low-clay fine-grained mixed sedimentary rocks provided in this embodiment of the invention.

[0216] Example 1

[0217] This embodiment provides a lithological interpretation method for low-clay fine-grained mixed sedimentary rocks, wherein the method includes:

[0218] 1. Obtain a model for determining the composition of low-clay fine-grained mixed sedimentary rocks, specifically including:

[0219] Step (1) Select core samples from a continuous core section of low-clay fine-grained mixed sedimentary rock, conduct a correlation analysis between rock component content and logging curves, and determine logging curves that can identify the main rock components of low-clay fine-grained mixed sedimentary rock.

[0220] ① A systematic observation and description of the continuously cored section of well LY1 was conducted, with samples taken every 10 cm. Whole-rock X-ray diffraction and organic carbon analysis were performed to determine the mineral composition and content of each sample. Core analysis data indicates (e.g.) Figure 1A , Figure 1B As shown in the figure, the shale section's mineral composition includes quartz, feldspar, calcite, dolomite, clay, analcime, pyrite, etc. Among them, the quartz + feldspar content ranges from 18% to 94% (average 54%), the calcite + dolomite content ranges from 5% to 82% (average 42%), and the clay content ranges from 0.1% to 9% (average 1.6%). Based on mineral content, the rock composition of well LY1 is divided into two main categories: felsic rocks and carbonate rocks. Felsic rocks include quartz and feldspar, while carbonate rocks include calcite and dolomite. The contents of the two categories show a significant negative correlation, with a correlation coefficient of 0.94 (e.g., ...). Figure 2 (As shown).

[0221] ② Obtain logging curves from the continuously cored section of well LY1. These logging curves include natural gamma ray, sonic transit time, compensated density logging data, compensated neutron logging data, and the ΔlogR curve calculated using the overlap method of sonic transit time logging data and resistivity logging data. Conduct correlation analysis between rock minerals and logging curves. Comparative analysis of rock composition and logging data reveals (e.g.) Figure 4 As shown in the figure, the felsic and carbonate contents have poor correlation with the natural gamma and resistivity curves. In contrast, the felsic and carbonate contents have a certain correlation with the sonic transit time logging data, compensated density logging data, compensated neutron logging data, and ΔlogR logging data (the multiple correlation coefficient is around 0.3). Therefore, the sonic transit time logging data, compensated density logging data, compensated neutron logging data, and ΔlogR logging data are preliminarily determined as logging curves that can identify the main rock components.

[0222] Step (2) Analyze the content of main rock components and the numerical distribution characteristics of logging curves in the continuous core section, and select rock components and logging curves with normal distribution as sensitive rock electrical parameters for determining the rock component content of low clay fine-grained mixed sedimentary rocks.

[0223] Based on the mineral content and logging data from the whole-rock X-ray diffraction analysis of the continuously cored section of well LY1, frequency distribution histograms and cumulative probability curves for felsic and carbonate contents, as well as frequency distribution histograms and cumulative probability curves for sonic transit time logging data, compensated density logging data, compensated neutron logging data, and ΔlogR curve data, were constructed. The analysis focused on which parameters exhibited normal distribution characteristics. The frequency distribution histograms show that... Figure 3 , Figure 5 Among the rock component contents, the frequency distribution of felsic content showed good normality, while the frequency distribution of carbonate content showed poor normality. In well logging data, the frequency distribution of compensated density showed good normality, almost appearing as a straight line on the cumulative probability curve, followed by compensated neutron logging data and ΔlogR logging data, while the frequency distribution of sonic transit time logging data showed poor normality. Therefore, compensated density logging data, ΔlogR logging data, compensated neutron logging data, and felsic content were selected as sensitive rock electrical parameters for determining the rock component contents of low-clay fine-grained mixed sedimentary rocks.

[0224] Step (3) Based on the cumulative probability curves of felsic content data, ΔlogR logging data, compensated density logging data and compensated neutron logging data of the continuous coring section of well LY1, determine the felsic content data, ΔlogR logging data, compensated density logging data and compensated neutron logging data corresponding to multiple cumulative probability quantiles.

[0225] From the cumulative probability curves of felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data in the continuous coring section of well LY1, seven quantiles (2%, 10%, 30%, 50%, 70%, 90%, and 98%) were selected by interpolation. The corresponding felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data for each cumulative probability quantile were determined. The results are shown in Table 1. Furthermore, the correlations between felsic content at each cumulative probability quantile and the compensated density logging data, compensated neutron logging data, and ΔlogR logging data were fitted. The results are shown in Table 1. Figure 6 As shown.

[0226] Table 1

[0227] Cumulative probability quantiles Long-lasting fructose content (%) <![CDATA[Compensated density (g / cm 3 )]]> Compensating neutrons (%) △logR 2％ 81 2.20 0.305 3.07 10％ 70 2.29 0.258 2.65 30％ 58 2.37 0.22 1.90 50％ 46 2.44 0.193 1.45 70％ 35 2.51 0.163 1.00 90％ 19 2.58 0.11 0.25 98％ 9 2.64 0.095 0.00

[0228] Step (4) uses Python software to perform multiple linear regression analysis on the felsic content data, ΔlogR logging data, compensated density logging data and compensated neutron logging data corresponding to each cumulative probability quantile determined in step (3), and establishes a mathematical calculation formula for felsic content with respect to ΔlogR logging data, compensated density logging data and compensated neutron logging data, which is the model for determining the rock component content of low clay fine-grained mixed sedimentary rocks.

[0229] Using the felsic content corresponding to each cumulative probability quantile as the dependent variable, and the compensated density logging data, compensated neutron logging data, and ΔlogR logging data corresponding to each cumulative probability quantile as independent variables, multiple regression was performed on the felsic content and the compensated density logging data, compensated neutron logging data, and ΔlogR logging values ​​using Python software. The relationship between the felsic content and each logging data was fitted, and a mathematical formula for calculating the felsic content with respect to ΔlogR logging data, compensated density logging data, and compensated neutron logging data was established. This formula forms the model for determining the rock component content of low-clay fine-grained mixed sedimentary rocks.

[0230] V 长英质 =169.19-62C DEN +22.75C CN +12.80C △logR R 2 =0.995

[0231] In the formula: V 长英质 The fels content of low-clay fine-grained mixed sedimentary rocks is expressed in %; C DEN Compensated density logging data for low-clay fine-grained mixed sedimentary rocks, unit: g / cm³ 3 C CN Compensated neutron logging data for low-clay fine-grained mixed sedimentary rocks, unit: %; C △logR The data are ΔlogR logging data for low-clay fine-grained mixed sedimentary rocks, with dimensionless units.

[0232] 2. Obtain a mathematical model relating felsic content to carbonate content in low-clay fine-grained mixed sedimentary rocks, specifically including:

[0233] Data on felsic and carbonate content were obtained from the core samples of the low-clay fine-grained mixed sedimentary rocks. Based on the felsic and carbonate content data of the core samples of the low-clay fine-grained mixed sedimentary rocks, a mathematical formula for calculating the carbonate content of the low-clay fine-grained mixed sedimentary rocks with respect to felsic content was fitted, which is the mathematical relationship model between the felsic and carbonate content of the low-clay fine-grained mixed sedimentary rocks.

[0234] Based on the felsic and carbonate contents of the continuously cored sections of well LY1, a mathematical formula for calculating the carbonate content with respect to the felsic content was fitted, which is the mathematical relationship model between the felsic and carbonate contents of low-clay fine-grained mixed sedimentary rocks:

[0235] V 碳酸盐 = -0.9893V 长英质 +95.172R 2 =0.9423

[0236] In the formula: V 长英质 The fels content of low-clay fine-grained mixed sedimentary rocks, in %; V 碳酸盐 The carbonate content of low-clay fine-grained mixed sedimentary rocks is expressed as a percentage.

[0237] 3. Obtain ΔlogR logging data, compensated density logging data, and compensated neutron logging data for the target low-clay fine-grained mixed sedimentary rock section, i.e., the target section of well LU1.

[0238] 4. Based on the ΔlogR logging data, compensated density logging data, and compensated neutron logging data of the target low-clay fine-grained mixed sedimentary rock interval, i.e., the target interval of well LU1, and combined with the rock component content of the low-clay fine-grained mixed sedimentary rock determined in step 1, determine model V. 长英质 =169.19-62C DEN +22.75C CN +12.80C △logR The fels content of the target low-clay fine-grained mixed sedimentary rock section, namely the target section of well LU1, was determined, and the results are as follows: Figure 7 As shown, Figure 7 The fels content calculated from the well logging data is the fels content determined in this embodiment.

[0239] 5. Based on the felsic content of the target low-clay fine-grained mixed sedimentary rock section, i.e., the target section of well LU1, and combined with the mathematical relationship model V between the felsic content and carbonate content of the low-clay fine-grained mixed sedimentary rock determined in step 2. 碳酸盐 =

[0240] -0.9893V 长英质 +95.172, determined the carbonate content of the target low-clay fine-grained mixed sedimentary rock section, i.e., the target section of well LU1, and the results are as follows. Figure 7 As shown, Figure 7 The carbonate content calculated from the well logging data is the carbonate content determined in this embodiment.

[0241] Depend on Figure 7 It can be seen that the rock component contents (felsic content and carbonate content) determined in this embodiment are in high agreement with the rock component contents obtained from core analysis, and the rock components are mainly felsic and carbonate.

[0242] 6. Based on the felsic and carbonate contents of the target low-clay fine-grained mixed sedimentary rock section, i.e., the target section of well LU1, the lithology of the target low-clay fine-grained mixed sedimentary rock section, i.e., the target section of well LU1, is determined using the following criteria:

[0243] When the felsic content of the target low-clay fine-grained mixed sedimentary rock section, namely the target section of well LU1, is ≥75% and the carbonate content is ≤25%, the lithology of the target low-clay fine-grained mixed sedimentary rock section is defined as tuff.

[0244] When the felsic content of the target low-clay fine-grained mixed sedimentary rock section, i.e. the target section of well LU1, is less than 75% but greater than or equal to 50%, the lithology of the target low-clay fine-grained mixed sedimentary rock section is determined to be dolomitic tuff (a transitional lithology between tuff and dolomite).

[0245] When the felsic content of the target low-clay fine-grained mixed sedimentary rock section, i.e. the target section of well LU1, is less than 50% but greater than 25%, the lithology of the target low-clay fine-grained mixed sedimentary rock section is determined to be tuffaceous dolomite (a transitional lithology between tuff and dolomite).

[0246] When the felsic content of the target low-clay fine-grained mixed sedimentary rock section, i.e., the target section of well LU1, is ≤25% and the carbonate content is ≥75%, the lithology of the target low-clay fine-grained mixed sedimentary rock section is determined to be dolomite.

[0247] The results are as follows Figure 7 As shown. (From...) Figure 7 It can be seen that the lithology of the target stratum in well LU1 is mainly tuff, dolomite, and transitional lithology between the two.

[0248] The technical solution provided by this invention can quickly carry out the calculation of mineral composition and continuous interpretation of lithology of low clay fine-grained mixed sedimentary rocks. It has strong adaptability and good implementation effect, and can provide a reliable basis for subsequent sweet spot evaluation and oil testing and selection, effectively improving the success rate of low clay shale oil exploration and development.

[0249] Those skilled in the art will understand that this specification can be provided as a method, system, or computer program product. Therefore, this specification may take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware. Furthermore, this specification may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0250] This specification is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments thereof. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. The computer may be a personal computer, laptop computer, cellular phone, camera phone, smartphone, personal digital assistant, media player, navigation device, email device, game console, tablet computer, wearable device, or any combination of these devices.

[0251] The functional units in the embodiments of this specification can be integrated into one processing unit, or each functional unit can exist physically separately, or two or more functional units can be integrated into one processing unit.

[0252] Those skilled in the art will understand that the descriptions of the various embodiments in this specification have different focuses, and parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments. Furthermore, it is understood that those skilled in the art, after reading this specification, can conceive of any combination of some or all of the embodiments listed in this specification without creative effort, and such combinations are also within the scope of disclosure and protection of this specification.

[0253] Although this specification has been described through embodiments, those skilled in the art will understand that the above embodiments are merely illustrative of the core ideas of this specification. Those skilled in the art will appreciate that many variations and modifications are possible with this specification. It is intended that the appended claims encompass these variations and modifications without departing from the spirit of this specification.

Claims

1. A method for determining the rock component content of low-clay fine-grained mixed sedimentary rocks, wherein, The method includes: Acquire ΔlogR logging data, compensated density logging data, and compensated neutron logging data for the target low-clay fine-grained mixed sedimentary rock interval; Based on the ΔlogR logging data, compensated density logging data, and compensated neutron logging data of the target low-clay fine-grained mixed sedimentary rock interval, and combined with the rock component content determination model of the low-clay fine-grained mixed sedimentary rock interval, the felsic content of the target low-clay fine-grained mixed sedimentary rock interval is determined; wherein, the rock component content determination model of the low-clay fine-grained mixed sedimentary rock interval is a mathematical relationship model between the felsic content of the low-clay fine-grained mixed sedimentary rock and the ΔlogR logging data, compensated density logging data, and compensated neutron logging data. The model for determining the rock component content of low-clay fine-grained mixed sedimentary rocks is as follows: V 长英质 =β0+β1·C DEN +β2·C CN +β3·C △logR In the formula: V 长英质 The fels content of low-clay fine-grained mixed sedimentary rocks is expressed in %; C DEN Compensated density logging data for low-clay fine-grained mixed sedimentary rocks, unit: g / cm³ 3 C CN Compensated neutron logging data for low-clay fine-grained mixed sedimentary rocks, unit: %; C △logR The data are ΔlogR logging data for low-clay fine-grained mixed sedimentary rocks, with dimensionless units; β0, β1, β2, and β3 are coefficients.

2. The method according to claim 1, wherein, The method for determining the rock component content of low-clay fine-grained mixed sedimentary rocks also includes: obtaining a model for determining the rock component content of low-clay fine-grained mixed sedimentary rocks; Among them, the models for determining the rock component content of low-clay fine-grained mixed sedimentary rocks include: Data on fels content, ΔlogR logging data, compensated density logging data, and compensated neutron logging data were obtained from the continuous core section of low-clay fine-grained mixed sedimentary rocks. Based on the felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data of the continuously cored sections of low-clay fine-grained mixed sedimentary rocks, a mathematical formula for calculating the felsic content of the low-clay fine-grained mixed sedimentary rocks with respect to the ΔlogR logging data, compensated density logging data, and compensated neutron logging data is fitted, which is the model for determining the rock component content of the low-clay fine-grained mixed sedimentary rocks.

3. The method according to claim 2, wherein, Based on felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data from continuously cored sections of low-clay fine-grained mixed sedimentary rocks, a mathematical formula for calculating the felsic content of low-clay fine-grained mixed sedimentary rocks with respect to ΔlogR logging data, compensated density logging data, and compensated neutron logging data was fitted. This formula constitutes the model for determining the rock component content of the aforementioned low-clay fine-grained mixed sedimentary rocks, including: Based on fels content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data from continuous coring sections of low-clay fine-grained mixed sedimentary rocks, the cumulative probability curves of fels content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data from continuous coring sections of low-clay fine-grained mixed sedimentary rocks were determined. Based on the cumulative probability curves of felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data of continuous coring sections of low-clay fine-grained mixed sedimentary rocks, the felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data corresponding to multiple cumulative probability quantiles were determined. Based on the felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data corresponding to each cumulative probability quantile, the mathematical formula for calculating the felsic content of the low-clay fine-grained mixed sedimentary rock with respect to the ΔlogR logging data, compensated density logging data, and compensated neutron logging data is fitted, which is the rock component content determination model of the low-clay fine-grained mixed sedimentary rock.

4. The method according to any one of claims 1-3, wherein, Methods for determining the rock component content of low-clay fine-grained mixed sedimentary rocks also include: Based on the felsic content of the target low-clay fine-grained mixed sedimentary rock section, and combined with the mathematical relationship model between the felsic content and carbonate content of the low-clay fine-grained mixed sedimentary rock section, the carbonate content of the target low-clay fine-grained mixed sedimentary rock section is determined. The mathematical model for the relationship between felsic content and carbonate content in low-clay fine-grained mixed sedimentary rocks is as follows: V 碳酸盐 =α1V 长英质 +a0 In the formula: V 长英质 The fels content of low-clay fine-grained mixed sedimentary rocks, in %; V 碳酸盐 The carbonate content is expressed as % for low-clay fine-grained mixed sedimentary rocks; α0 and α1 are coefficients.

5. The method according to claim 4, wherein, Methods for determining the rock component content of low-clay fine-grained mixed sedimentary rocks also include: obtaining a mathematical model of the relationship between felsic content and carbonate content in low-clay fine-grained mixed sedimentary rocks; The mathematical model relating felsic content to carbonate content in low-clay fine-grained mixed sedimentary rocks includes: Obtain felsic and carbonate content data from the core samples of the low-clay fine-grained mixed sedimentary rocks; Based on the felsic and carbonate content data of the core samples from the low-clay fine-grained mixed sedimentary rocks, a mathematical formula for calculating the carbonate content of the low-clay fine-grained mixed sedimentary rocks with respect to the felsic content was fitted. This formula is the mathematical relationship model between the felsic and carbonate content of the low-clay fine-grained mixed sedimentary rocks.

6. A lithological interpretation method for low-clay fine-grained mixed sedimentary rocks, wherein, The method includes: The felsic content and carbonate content of the target low-clay fine-grained mixed sedimentary rock section are determined using the rock component content determination method of claim 4 or 5. Based on the felsic and carbonate contents of the target low-clay fine-grained mixed sedimentary rock section, the lithology of the target low-clay fine-grained mixed sedimentary rock section was determined.

7. The method according to claim 6, wherein, The lithology of the target low-clay fine-grained mixed sedimentary rock section was determined using the following criteria: When the fels content of the target low-clay fine-grained mixed sedimentary rock section is ≥75% and the carbonate content is ≤25%, the lithology of the target low-clay fine-grained mixed sedimentary rock section is defined as tuff. When the felsic content of the target low-clay fine-grained mixed sedimentary rock section is less than 75% and greater than or equal to 50%, the lithology of the target low-clay fine-grained mixed sedimentary rock section is determined to be dolomitic tuff. When the felsic content of the target low-clay fine-grained mixed sedimentary rock section is less than 50% but greater than 25%, the lithology of the target low-clay fine-grained mixed sedimentary rock section is defined as tuffaceous dolomite. When the fels content of the target low-clay fine-grained mixed sedimentary rock section is ≤25% and the carbonate content is ≥75%, the lithology of the target low-clay fine-grained mixed sedimentary rock section is determined to be dolomite.

8. A device for determining the rock component content of low-clay fine-grained mixed sedimentary rocks, wherein, The device includes: Target Formation Data Acquisition Module: Used to acquire ΔlogR logging data, compensated density logging data, and compensated neutron logging data of the target low-clay fine-grained mixed sedimentary rock formation; Fels content determination module: This module is used to determine the fels content of the target low-clay fine-grained mixed sedimentary rock interval based on the ΔlogR logging data, compensated density logging data, and compensated neutron logging data, combined with the rock component content determination model of low-clay fine-grained mixed sedimentary rock. The rock component content determination model of low-clay fine-grained mixed sedimentary rock is a mathematical relationship model between the fels content of low-clay fine-grained mixed sedimentary rock and the ΔlogR logging data, compensated density logging data, and compensated neutron logging data. The model for determining the rock component content of low-clay fine-grained mixed sedimentary rocks is as follows: V 长英质 =β0+β1·C DEN +β2·C CN +β3·C △logR In the formula: V 长英质 The fels content of low-clay fine-grained mixed sedimentary rocks is expressed in %; C DEN Compensated density logging data for low-clay fine-grained mixed sedimentary rocks, unit: g / cm³ 3 C CN Compensated neutron logging data for low-clay fine-grained mixed sedimentary rocks, unit: %; C △logR The data are ΔlogR logging data for low-clay fine-grained mixed sedimentary rocks, with dimensionless units; β0, β1, β2, and β3 are coefficients.

9. The apparatus according to claim 8, wherein, The device for determining the rock component content of low-clay fine-grained mixed sedimentary rocks also includes: Carbonate content determination module: Based on the felsic content of the target low-clay fine-grained mixed sedimentary rock section, and combined with the mathematical relationship model between the felsic content and carbonate content of the low-clay fine-grained mixed sedimentary rock section, the carbonate content of the target low-clay fine-grained mixed sedimentary rock section is determined. The mathematical model for the relationship between felsic content and carbonate content in low-clay fine-grained mixed sedimentary rocks is as follows: V 碳酸盐 =α1V 长英质 +a0 In the formula: V 长英质 The fels content of low-clay fine-grained mixed sedimentary rocks, in %; V 碳酸盐 The carbonate content is expressed as % for low-clay fine-grained mixed sedimentary rocks; α0 and α1 are coefficients.

10. A lithological interpretation apparatus for low-clay fine-grained mixed sedimentary rocks, wherein the apparatus comprises: The device for determining the rock component content of low-clay fine-grained mixed sedimentary rocks as described in claim 9: used to determine the felsic content and carbonate content of the target low-clay fine-grained mixed sedimentary rock section; Lithology Determination Module: Used to determine the lithology of the target low-clay fine-grained mixed sedimentary rock section based on the felsic and carbonate contents.

11. The apparatus according to claim 10, wherein, The lithology of the target low-clay fine-grained mixed sedimentary rock section was determined using the following criteria: When the fels content of the target low-clay fine-grained mixed sedimentary rock section is ≥75% and the carbonate content is ≤25%, the lithology of the target low-clay fine-grained mixed sedimentary rock section is defined as tuff. When the felsic content of the target low-clay fine-grained mixed sedimentary rock section is less than 75% and greater than or equal to 50%, the lithology of the target low-clay fine-grained mixed sedimentary rock section is determined to be dolomitic tuff. When the felsic content of the target low-clay fine-grained mixed sedimentary rock section is less than 50% but greater than 25%, the lithology of the target low-clay fine-grained mixed sedimentary rock section is defined as tuffaceous dolomite. When the fels content of the target low-clay fine-grained mixed sedimentary rock section is ≤25% and the carbonate content is ≥75%, the lithology of the target low-clay fine-grained mixed sedimentary rock section is determined to be dolomite.

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