Rock component content determination method and lithology interpretation method for low-clay fine-grained mixed rock

Abstract

The invention provides a rock component content determination method and a lithology interpretation method for low-clay fine-grained mixed rock. The lithology interpretation method comprises the steps that on the basis of logR logging data, compensated density logging data and compensated neutron logging data of a target low-clay fine-grained mixed rock stratum section, the long quartz content of the target low-clay fine-grained mixed rock stratum section is determined by combining a low-clay fine-grained mixed rock component content determination model; determining the carbonate content of the target low-clay fine-grained mixed rock stratum section by combining a mathematical relationship model of the long quartz content and the carbonate content of the low-clay fine-grained mixed rock; based on the long quartz content and the carbonate content of the target low-clay fine-grained mixed rock stratum section, the lithology of the target low-clay fine-grained mixed rock stratum section is determined. Wherein the model for determining the rock component content of the low-clay fine-grained mixed rock is a mathematical relational expression model of the long quartz content of the low-clay fine-grained mixed rock and logR data, compensation density data and compensation neutron data.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas exploration and development, and in particular to a method for determining the rock component content of low-clay fine-grained mixed rock and a method for interpreting the lithology of low-clay fine-grained mixed rock. Background Art

[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 rocks have gradually become a hot spot in sedimentological research. Fine-grained mixed rocks refer to sedimentary rocks with a particle content of more than 50% of particles with a particle size of <0.0625mm. The fine-grained mixed rocks discovered so far are mainly composed of terrigenous clastic particles such as clay (particle size <0.004mm) and silt (0.004-0.0625mm) or carbonate and biogenic silica particles endogenous to the basin, and are characterized by "complex mineral composition, diverse lithology, and high abundance of organic matter".

[0003] Low-clay fine-grained mixed rock (referring to fine-grained mixed rock with a clay content of no more than 10%) has different degrees of development in multiple basins. In addition to being controlled by the sedimentary environment and paleoclimate, its distribution is also obviously related to volcanic activity, and its plane and vertical heterogeneity is extremely strong. Drilling in low-clay fine-grained mixed rock formations generally shows abundant oil and gas shows, but the production varies greatly. Compared with other types of fine-grained mixed rocks, low-clay fine-grained mixed rocks have the characteristics of "high felsic + carbonate content (the content of both is generally higher than 85%), basically no clay, and generally contain organic matter". The particularity of this mineral component brings great difficulty to the interpretation of lithology; at the same time, affected by the intensity of volcanic activity and the frequent changes in water salinity, oxidation-reduction degree, and paleoclimate, the lithology changes very quickly in the vertical and horizontal directions, usually showing the characteristics of inter-distribution of felsic, carbonate, and organic matter laminae, and developing more than 20 types of lithofacies such as laminar, layered, massive structures, and laminated dolomite tuff and layered tuff; core data show that TOC, physical properties, oil content and production capacity of different lithofacies are significantly different. Therefore, the accuracy of lithology identification directly determines the vertical layer selection and plane selection of shale oil "sweet spots".

[0004] The existing methods for distinguishing the lithology of fine-grained mixed rocks are generally based on the calculation of the main mineral content based on conventional logging curves such as GR, RXO, and AC, and are divided into mudstone, silt-fine sandstone, carbonate rock, and transitional rocks according to the relative content of the three end-member components of clay, terrigenous debris, and carbonate. For low-clay fine-grained mixed rocks, due to their special mineral components, there is currently no effective lithology fine evaluation method, which seriously restricts the evaluation and exploration deployment of the "sweet spot" of this type of shale oil. Summary of the invention

[0005] The object of the present invention is to provide a technical solution that can quickly and effectively determine the rock component content and interpret the lithology of low-clay fine-grained mixed rocks.

[0006] In order 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 rock, wherein the method comprises:

[0008] Obtain △logR logging data, compensated density logging data and compensated neutron logging data of the target low-clay fine-grained mixed rock layer;

[0009] Based on the △logR logging data, compensated density logging data and compensated neutron logging data of the target low-clay fine-grained mixed rock section, combined with the rock component content determination model of low-clay fine-grained mixed rock, the felsic content of the target low-clay fine-grained mixed rock section is determined; among which, the rock component content determination model of low-clay fine-grained mixed rock is a mathematical relationship model between the felsic content of low-clay fine-grained mixed rock and the △logR 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 rock further comprises:

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

[0012] According to a preferred embodiment of the first aspect, the rock component content determination model of low-clay fine-grained mixed rock is:

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

[0014] Where: V 长英质 is the felsic content of low-clay fine-grained mixed rock, in %; C DEN It is the compensated density logging data of low clay fine-grained mixed rock, unit is g / cm 3 ; C CN is the compensated neutron logging data of low-clay fine-grained mixed rock, unit: %; C △logR is the △logR logging data of low-clay fine-grained mixed rock, and the unit is dimensionless; β0, β1, β2, and β3 are coefficients, which can be calibrated by the rock component content data and logging data of the coring section of low-clay fine-grained mixed rock.

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

[0016] Among them, the model for determining the rock component content of low-clay fine-grained mixed rock includes:

[0017] Obtain the felsic content data, △logR logging data, compensated density logging data and compensated neutron logging data of the continuous coring section of low-clay fine-grained mixed rock;

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

[0019] More preferably, based on the felsic content data of the continuous coring section of the low-clay fine-grained mixed rock, ΔlogR logging data, compensated density logging data and compensated neutron logging data, the mathematical calculation formula of the felsic content of the low-clay fine-grained mixed rock with respect to the ΔlogR logging data, the compensated density logging data and the compensated neutron logging data is fitted, that is, the rock component content determination model of the low-clay fine-grained mixed rock includes:

[0020] Based on the felsic content data, △logR logging data, compensated density logging data and compensated neutron logging data of the continuous coring section of the low-clay fine-grained mixed rock, the cumulative probability curve of the felsic content data, the cumulative probability curve of the △logR logging data, the cumulative probability curve of the compensated density logging data and the cumulative probability curve of the compensated neutron logging data of the continuous coring section of the low-clay fine-grained mixed rock are determined;

[0021] Based on the cumulative probability curve of felsic content data of the continuous coring section of low-clay fine-grained mixed rock, the cumulative probability curve of △logR logging data, the cumulative probability curve of compensated density logging data and the cumulative probability curve of compensated neutron logging data, the felsic content data, △logR logging data, compensated density logging data and compensated neutron logging data corresponding to multiple cumulative probability quantiles are determined;

[0022] Based on the felsic content data, △logR 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 low-clay fine-grained mixed rock with respect to △logR 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 rock.

[0023] According to a preferred implementation of the first aspect, the mathematical relationship model between the felsic content and the carbonate content of the low-clay fine-grained mixed rock is:

[0024] V 碳酸盐 =α1V 长英质 +α0

[0025] Where: V 长英质 V is the felsic content of low-clay fine-grained mixed rock, in %; 碳酸盐 is the carbonate content of low-clay fine-grained mixed rock, in %; α0 and α1 are coefficients, which can be calibrated by the felsic content data and carbonate content data of the core of the low-clay fine-grained mixed rock coring section.

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

[0027] Among them, the mathematical relationship model between the felsic content and carbonate content of low-clay fine-grained mixed rocks includes:

[0028] Obtain the felsic content data and carbonate content data of the core of the low-clay fine-grained mixed rock coring section;

[0029] Based on the felsic content data and carbonate content data of the core of the coring section of the low-clay fine-grained mixed rock, the mathematical calculation formula for the felsic content of the carbonate content data of the low-clay fine-grained mixed rock is fitted, which is the mathematical relationship model between the felsic content and the carbonate content of the low-clay fine-grained mixed rock.

[0030] In a second aspect, the present invention provides a lithology interpretation method for low-clay fine-grained mixed rock, wherein the method comprises:

[0031] Determine the felsic content and carbonate content of the target low-clay fine-grained mixed rock layer section using the rock component content determination method of the low-clay fine-grained mixed rock provided in the first aspect;

[0032] The lithology of the target low-clay fine-grained mixed rock section is determined based on the felsic content and carbonate content of the target low-clay fine-grained mixed rock section.

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

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

[0035] When the felsic content of the target low-clay fine-grained mixed rock section is less than 75% and greater than or equal to 50%, the lithology of the target low-clay fine-grained mixed 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 rock section is less than 50% and greater than 25%, the lithology of the target low-clay fine-grained mixed rock section is defined as tuffaceous dolomite (a transitional lithology between tuff and dolomite);

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

[0038] In a third aspect, the present invention provides a device for determining rock component content of low-clay fine-grained mixed rock, wherein the device comprises:

[0039] Target layer data acquisition module: used to obtain △logR logging data, compensated density logging data and compensated neutron logging data of the target low-clay fine-grained mixed rock layer;

[0040] The module for determining the felsic content is used to determine the felsic content of the target low-clay fine-grained mixed rock section based on the △logR logging data, compensated density logging data and compensated neutron logging data of the target low-clay fine-grained mixed rock section, combined with the rock component content determination model of the low-clay fine-grained mixed rock; wherein, the rock component content determination model of the low-clay fine-grained mixed rock is a mathematical relationship model between the felsic content of the low-clay fine-grained mixed rock and the △logR 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 rock further comprises:

[0042] Carbonate content determination module: used to determine the carbonate content of the target low-clay fine-grained mixed rock section based on the felsic content of the target low-clay fine-grained mixed rock section and the mathematical relationship model between the felsic content and carbonate content of the low-clay fine-grained mixed rock.

[0043] According to a preferred implementation of the third aspect, the rock component content determination model of low-clay fine-grained mixed rock is:

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

[0045] Where: V 长英质 is the felsic content of low-clay fine-grained mixed rock, in %; C DENIt is the compensated density logging data of low clay fine-grained mixed rock, unit is g / cm 3 ; C CN is the compensated neutron logging data of low-clay fine-grained mixed rock, unit: %; C △logR is the △logR logging data of low-clay fine-grained mixed rock, and the unit is dimensionless; β0, β1, β2, and β3 are coefficients, which can be calibrated by the rock component content data and logging data of the coring section of low-clay fine-grained mixed rock.

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

[0047] The first model acquisition module is used to obtain a rock component content determination model for low-clay fine-grained mixed rock;

[0048] Wherein, the first model acquisition module includes:

[0049] Continuous coring section data acquisition submodule: used to obtain the felsic content data, △logR logging data, compensated density logging data and compensated neutron logging data of the continuous coring section of low-clay fine-grained mixed rock;

[0050] The first model determination submodule is used to fit the felsic content data of the continuous coring section of the low-clay fine-grained mixed rock, the △logR logging data, the compensated density logging data and the compensated neutron logging data to obtain the mathematical calculation formula of the felsic content of the low-clay fine-grained mixed rock with respect to the △logR logging data, the compensated density logging data and the compensated neutron logging data, which is the rock component content determination model of the low-clay fine-grained mixed rock;

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

[0052] Probability curve determination unit: used for determining the cumulative probability curve of the felsic content data of the continuous coring section of the low-clay fine-grained mixed rock, the cumulative probability curve of the △logR logging data, the cumulative probability curve of the compensated density logging data and the cumulative probability curve of the compensated neutron logging data based on the felsic content data of the continuous coring section of the low-clay fine-grained mixed rock, the △logR logging data, the compensated density logging data and the compensated neutron logging data;

[0053] A unit for determining data corresponding to cumulative probability quantiles: used to determine the felsic content data, △logR logging data, compensated density logging data and compensated neutron logging data corresponding to a plurality of cumulative probability quantiles based on the cumulative probability curve of the felsic content data of the continuous coring section of the low-clay fine-grained mixed rock, the cumulative probability curve of the △logR logging data, the cumulative probability curve of the compensated density logging data and the cumulative probability curve of the compensated neutron logging data;

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

[0055] According to a preferred implementation of the third aspect, the mathematical relationship model between the felsic content and the carbonate content of the low-clay fine-grained mixed rock is:

[0056] V 碳酸盐 =α1V 长英质 +α0

[0057] Where: V 长英质 V is the felsic content of low-clay fine-grained mixed rock, in %; 碳酸盐 is the carbonate content of low-clay fine-grained mixed rock, in %; α0 and α1 are coefficients, which can be calibrated by the felsic content data and carbonate content data of the core of the low-clay fine-grained mixed rock coring section.

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

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

[0060] Wherein, the second model acquisition module includes:

[0061] Core data acquisition submodule: used to obtain the felsic content data and carbonate content data of the core of the low-clay fine-grained mixed rock coring section;

[0062] The second model determination submodule is used to fit the mathematical calculation formula of the carbonate content data of the low-clay fine-grained mixed rock with respect to the felsic content based on the felsic content data and carbonate content data of the core of the coring section of the low-clay fine-grained mixed rock, which is the mathematical relationship model between the felsic content and the carbonate content of the low-clay fine-grained mixed rock.

[0063] In a fourth aspect, the present invention further provides a lithology interpretation device for low-clay fine-grained mixed rock, wherein the device comprises:

[0064] The rock component content determination device of low-clay fine-grained mixed rock provided in the third aspect of the present invention is used to determine the felsic content and carbonate content of the target low-clay fine-grained mixed rock layer section;

[0065] Lithology determination module: used to determine the lithology of the target low-clay fine-grained mixed rock layer based on the felsic content and carbonate content of the target low-clay fine-grained mixed rock layer.

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

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

[0068] When the felsic content of the target low-clay fine-grained mixed rock section is less than 75% and greater than or equal to 50%, the lithology of the target low-clay fine-grained mixed 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 rock section is less than 50% and greater than 25%, the lithology of the target low-clay fine-grained mixed rock section is defined as tuffaceous dolomite (a transitional lithology between tuff and dolomite);

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

[0071] In a fifth aspect, an embodiment of the present specification also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the method for determining the rock component content of low-clay fine-grained mixed rock provided in the first aspect is implemented.

[0072] In a sixth aspect, an embodiment of the present specification also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the lithology interpretation method for low-clay fine-grained mixed rock provided in the second aspect is implemented.

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

[0074] In an eighth aspect, the present invention provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the lithology interpretation method for low-clay fine-grained mixed rock provided in the second aspect.

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

[0076] In a tenth aspect, the present invention provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, it implements the lithology interpretation method of low-clay fine-grained mixed rock provided in the second aspect.

[0077] The technical solution provided by the present invention can quickly and effectively determine the rock component content of low-clay fine-grained mixed rock, and can quickly and effectively interpret the lithology of low-clay fine-grained mixed rock. The technical solution provided by the present invention can effectively carry out the fine determination of the mineral content of low-clay fine-grained mixed rock and the automatic and continuous identification of lithology. Compared with the results of the fine description of the core, it is found that the compliance rate of the lithology prediction of the well to be evaluated can reach more than 85%. The technical solution provided by the present invention not only provides a sufficient basis for the real-time identification of lithology at the drilling site of low-clay fine-grained mixed rock, but also provides support for the evaluation of shale oil sweet spots and later fracturing, reducing the cost of shale oil exploration and development. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. The drawings described below are only some embodiments recorded in this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

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

[0080] Figure 1B This is the triangular diagram of mineral composition classification of the continuous coring section of Well LY1.

[0081] Figure 2 This is the relationship between the felsic content and carbonate content in the continuous coring section of Well LY1.

[0082] Figure 3 The frequency distribution histogram and cumulative probability curve of felsic content and carbonate content in the continuous coring section of Well LY1.

[0083] Figure 4 This is the intersection diagram of the felsic content, carbonate content and logging curves in the continuous coring section of Well LY1.

[0084] Figure 5 This is the frequency distribution histogram and cumulative probability curve of logging data in the continuous coring section of Well LY1.

[0085] Figure 6 This is the relationship diagram between the felsic content and the compensated density logging data, compensated neutron logging data, and △logR logging data in the continuous coring section of Well LY1.

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

[0087] The technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, rather than all of the embodiments. The specific embodiments described herein are only used to explain the present disclosure, rather than to limit the present disclosure. Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art are within the scope of protection of the present 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] An embodiment of the present invention provides a method for determining rock component content of low-clay fine-grained mixed rock, wherein the method comprises:

[0089] Step S11: acquiring ΔlogR logging data, compensated density logging data and compensated neutron logging data of the target low-clay fine-grained mixed rock layer;

[0090] Step S12: Based on the △logR logging data, compensated density logging data and compensated neutron logging data of the target low-clay fine-grained mixed rock layer section, combined with the rock component content determination model of the low-clay fine-grained mixed rock, the felsic content of the target low-clay fine-grained mixed rock layer section is determined; wherein the rock component content determination model of the low-clay fine-grained mixed rock is a mathematical relationship model of the felsic content of the low-clay fine-grained mixed rock and the △logR data, the compensated density data and the compensated neutron data;

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

[0092] In some embodiments, the rock component content determination model of low-clay fine-grained mixed rock is:

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

[0094] Where: V 长英质 is the felsic content of low-clay fine-grained mixed rock, in %; C DEN It is the compensated density logging data of low clay fine-grained mixed rock, unit is g / cm 3 ; C CN is the compensated neutron logging data of low-clay fine-grained mixed rock, unit: %; C △logR is the △logR logging data of low-clay fine-grained mixed rock, and the unit is dimensionless; β0, β1, β2, and β3 are coefficients, which can be obtained by calibrating the rock component content data and logging data of the low-clay fine-grained mixed rock core section;

[0095] Furthermore, the rock component content determination model of low-clay fine-grained mixed rock 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 rock further includes:

[0097] Step S14: obtaining a rock component content determination model for low-clay fine-grained mixed rock;

[0098] Wherein, step S14 obtains the rock component content determination model of low-clay fine-grained mixed rock, including:

[0099] Step S141: obtaining felsic content data, ΔlogR logging data, compensated density logging data and compensated neutron logging data of a continuous coring section of low-clay fine-grained mixed rock;

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

[0101] Further, step S142 is based on the felsic content data of the continuous coring section of the low-clay fine-grained mixed rock, the ΔlogR logging data, the compensated density logging data and the compensated neutron logging data, and the mathematical calculation formula of the felsic content of the low-clay fine-grained mixed rock with respect to the ΔlogR logging data, the compensated density logging data and the compensated neutron logging data is fitted, that is, the rock component content determination model of the low-clay fine-grained mixed rock includes:

[0102] Step S1421: determining a cumulative probability curve of the felsic content data of the continuous coring section of the low-clay fine-grained mixed rock, a cumulative probability curve of the ΔlogR logging data, a cumulative probability curve of the compensated density logging data, and a cumulative probability curve of the compensated neutron logging data based on the felsic content data of the continuous coring section of the low-clay fine-grained mixed rock, the cumulative probability curve of the ΔlogR logging data, the cumulative probability curve of the compensated density logging data, and the cumulative probability curve of the compensated neutron logging data;

[0103] Step S1422: determining the felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data corresponding to a plurality of cumulative probability quantiles based on the cumulative probability curve of the felsic content data of the continuous coring section of the low-clay fine-grained mixed rock, the cumulative probability curve of the ΔlogR logging data, the cumulative probability curve of the compensated density logging data, and the cumulative probability curve of the compensated neutron logging data;

[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, a mathematical calculation formula of the felsic content of the low-clay fine-grained mixed rock with respect to the ΔlogR logging data, the compensated density logging data and the compensated neutron logging data is fitted, which is the rock component content determination model of the low-clay fine-grained mixed rock;

[0105] Further, in the process of 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 relationship model between the felsic content and the carbonate content of the low-clay fine-grained mixed rock is:

[0107] V 碳酸盐 =α1V 长英质 +α0

[0108] Where: V 长英质 V is the felsic content of low-clay fine-grained mixed rock, in %; 碳酸盐 is the carbonate content of low-clay fine-grained mixed rock, in %; α0 and α1 are coefficients, which can be obtained by calibrating the felsic content data and carbonate content data of the core of the low-clay fine-grained mixed rock coring section;

[0109] Furthermore, the mathematical relationship model between the felsic content and the carbonate content of the low-clay fine-grained mixed rock is: 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 rock further includes:

[0111] Step S15: obtaining a mathematical relationship model between the felsic content and the carbonate content of the low-clay fine-grained mixed rock;

[0112] Among them, the mathematical relationship model of the felsic content and carbonate content of the low-clay fine-grained mixed rock in step S15 includes:

[0113] Step S151: obtaining data on the felsic content and carbonate content of the core of the low-clay fine-grained mixed rock coring section;

[0114] Step S142: Based on the felsic content data and carbonate content data of the core of the coring section of the low-clay fine-grained mixed rock, a mathematical calculation formula for the carbonate content data of the low-clay fine-grained mixed 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 rock.

[0115] An embodiment of the present invention provides a lithology interpretation method for low-clay fine-grained mixed rock, wherein the method comprises:

[0116] Step S21: acquiring ΔlogR logging data, compensated density logging data and compensated neutron logging data of the target low-clay fine-grained mixed rock layer;

[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 rock section, combined with the rock component content determination model of the low-clay fine-grained mixed rock, the felsic content of the target low-clay fine-grained mixed rock section is determined; wherein the rock component content determination model of the low-clay fine-grained mixed rock is a mathematical relationship model of the felsic content of the low-clay fine-grained mixed rock and the ΔlogR data, the compensated density data and the compensated neutron data;

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

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

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

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

[0122] When the felsic content of the target low-clay fine-grained mixed rock section is less than 75% and greater than or equal to 50%, the lithology of the target low-clay fine-grained mixed 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 rock section is less than 50% and greater than 25%, the lithology of the target low-clay fine-grained mixed rock section is defined as tuffaceous dolomite (a transitional lithology between tuff and dolomite);

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

[0125] In some embodiments, the rock component content determination model of low-clay fine-grained mixed rock is:

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

[0127] Where: V 长英质 is the felsic content of low-clay fine-grained mixed rock, in %; C DEN It is the compensated density logging data of low clay fine-grained mixed rock, unit is g / cm 3 ; C CN is the compensated neutron logging data of low-clay fine-grained mixed rock, unit: %; C △logR is the △logR logging data of low-clay fine-grained mixed rock, and the unit is dimensionless; β0, β1, β2, and β3 are coefficients, which can be obtained by calibrating the rock component content data and logging data of the low-clay fine-grained mixed rock core section;

[0128] Furthermore, the rock component content determination model of low-clay fine-grained mixed rock 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 rock further includes:

[0130] Step S25: obtaining a rock component content determination model for low-clay fine-grained mixed rock;

[0131] Wherein, step S25 obtains the rock component content determination model of low-clay fine-grained mixed rock, including:

[0132] Step S251: obtaining felsic content data, ΔlogR logging data, compensated density logging data and compensated neutron logging data of a continuous coring section of low-clay fine-grained mixed rock;

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

[0134] Further, step S252 is based on the felsic content data of the continuous coring section of the low-clay fine-grained mixed rock, the ΔlogR logging data, the compensated density logging data and the compensated neutron logging data, and the mathematical calculation formula of the felsic content of the low-clay fine-grained mixed rock with respect to the ΔlogR logging data, the compensated density logging data and the compensated neutron logging data is fitted, that is, the rock component content determination model of the low-clay fine-grained mixed rock includes:

[0135] Step S2521: determining a cumulative probability curve of the felsic content data of the continuous coring section of the low-clay fine-grained mixed rock, a cumulative probability curve of the ΔlogR logging data, a cumulative probability curve of the compensated density logging data, and a cumulative probability curve of the compensated neutron logging data based on the felsic content data of the continuous coring section of the low-clay fine-grained mixed rock, the cumulative probability curve of the ΔlogR logging data, the cumulative probability curve of the compensated density logging data, and the cumulative probability curve of the compensated neutron logging data;

[0136] Step S2522: determining the felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data corresponding to a plurality of cumulative probability quantiles based on the cumulative probability curve of the felsic content data of the continuous coring section of the low-clay fine-grained mixed rock, the cumulative probability curve of the ΔlogR logging data, the cumulative probability curve of the compensated density logging data, and the cumulative probability curve of the compensated neutron logging data;

[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, a mathematical calculation formula of the felsic content of the low-clay fine-grained mixed rock with respect to the ΔlogR logging data, the compensated density logging data and the compensated neutron logging data is fitted, which is the rock component content determination model of the low-clay fine-grained mixed rock;

[0138] Further, in the process of 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 relationship model between the felsic content and the carbonate content of the low-clay fine-grained mixed rock is:

[0140] V 碳酸盐 =α1V 长英质 +α0

[0141] Where: V 长英质 V is the felsic content of low-clay fine-grained mixed rock, in %; 碳酸盐 is the carbonate content of low-clay fine-grained mixed rock, in %; α0 and α1 are coefficients, which can be obtained by calibrating the felsic content data and carbonate content data of the core of the low-clay fine-grained mixed rock coring section;

[0142] Furthermore, the mathematical relationship model between the felsic content and the carbonate content of the low-clay fine-grained mixed rock is: 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 rock further includes:

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

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

[0146] Step S261: obtaining data on the felsic content and carbonate content of the core of the low-clay fine-grained mixed rock coring section;

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

[0148] The embodiments of this specification provide a device for determining the rock component content of low-clay fine-grained mixed rock, as described in the following embodiments. Since the principle of solving the problem by the device is similar to the method for determining the rock component content of low-clay fine-grained mixed rock, the implementation of the device can refer to the implementation of the method for determining the rock component content of low-clay fine-grained mixed rock, and the repeated parts will not be repeated.

[0149] The rock component content determination device of low-clay fine-grained mixed rock provided by the embodiment of the present invention comprises:

[0150] Target layer data acquisition module 31: used to acquire △logR logging data, compensated density logging data and compensated neutron logging data of the target low-clay fine-grained mixed rock layer;

[0151] The felsic content determination module 32 is used to determine the felsic content of the target low-clay fine-grained mixed rock section based on the △logR logging data, the compensated density logging data and the compensated neutron logging data of the target low-clay fine-grained mixed rock section, combined with the rock component content determination model of the low-clay fine-grained mixed rock; wherein the rock component content determination model of the low-clay fine-grained mixed rock is a mathematical relationship model between the felsic content of the low-clay fine-grained mixed rock and the △logR data, the compensated density data and the 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 rock segment based on the felsic content of the target low-clay fine-grained mixed rock segment and a mathematical relationship model between the felsic content and the carbonate content of the low-clay fine-grained mixed rock segment.

[0153] In some embodiments, the rock component content determination model of low-clay fine-grained mixed rock is:

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

[0155] Where: V 长英质 is the felsic content of low-clay fine-grained mixed rock, in %; C DEN It is the compensated density logging data of low clay fine-grained mixed rock, unit is g / cm 3 ; C CN is the compensated neutron logging data of low-clay fine-grained mixed rock, unit: %; C △logR is the △logR logging data of low-clay fine-grained mixed rock, and the unit is dimensionless; β0, β1, β2, and β3 are coefficients, which can be obtained by calibrating the rock component content data and logging data of the low-clay fine-grained mixed rock core section;

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

[0157] In some embodiments, the device for determining the rock component content of low-clay fine-grained mixed rock further comprises:

[0158] The first model acquisition module 34 is used to obtain a rock component content determination model for low-clay fine-grained mixed rock;

[0159] Wherein, the first model acquisition module 34 includes:

[0160] Continuous coring section data acquisition submodule 341: used to obtain felsic content data, △logR logging data, compensated density logging data and compensated neutron logging data of continuous coring section of low clay fine-grained mixed rock;

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

[0162] Further, the first model determination submodule 342 includes:

[0163] The probability curve determining unit 3421 is used to determine the cumulative probability curve of the felsic content data of the continuous coring section of the low-clay fine-grained mixed rock, the cumulative probability curve of the △logR logging data, the cumulative probability curve of the compensated density logging data, and the cumulative probability curve of the compensated neutron logging data based on the felsic content data of the continuous coring section of the low-clay fine-grained mixed rock, the △logR logging data, the compensated density logging data, and the compensated neutron logging data;

[0164] The cumulative probability quantile corresponding data determining unit 3422 is used to determine the felsic content data, △logR logging data, compensated density logging data and compensated neutron logging data corresponding to multiple cumulative probability quantiles based on the cumulative probability curve of the felsic content data of the continuous coring section of the low-clay fine-grained mixed rock, the cumulative probability curve of the △logR logging data, the cumulative probability curve of the compensated density logging data and the cumulative probability curve of the compensated neutron logging data;

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

[0166] Further, in the process of 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 relationship model between the felsic content and the carbonate content of the low-clay fine-grained mixed rock is:

[0168] V 碳酸盐 =α1V 长英质 +α0

[0169] Where: V 长英质 V is the felsic content of low-clay fine-grained mixed rock, in %; 碳酸盐 is the carbonate content of low-clay fine-grained mixed rock, in %; α0 and α1 are coefficients, which can be obtained by calibrating the felsic content data and carbonate content data of the core of the low-clay fine-grained mixed rock coring section;

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

[0171] In some embodiments, the device for determining the rock component content of low-clay fine-grained mixed rock further comprises:

[0172] The second model acquisition module 35 is used to obtain a mathematical relationship model between the felsic content and the carbonate content of the low-clay fine-grained mixed rock;

[0173] Wherein, the second model acquisition module 35 includes:

[0174] Core data acquisition submodule 351: used to obtain the felsic content data and carbonate content data of the core of the low-clay fine-grained mixed rock coring section;

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

[0176] The embodiment of this specification provides a lithology interpretation device for low-clay fine-grained mixed rock, as described in the following embodiment. Since the principle of the device to solve the problem is similar to the lithology interpretation method for low-clay fine-grained mixed rock, the implementation of the device can refer to the implementation of the lithology interpretation method for low-clay fine-grained mixed rock, and the repeated parts will not be repeated.

[0177] The lithology interpretation device for low-clay fine-grained mixed rock provided by the embodiment of the present invention comprises:

[0178] Target layer data acquisition module 41: used to acquire △logR logging data, compensated density logging data and compensated neutron logging data of the target low-clay fine-grained mixed rock layer;

[0179] The felsic content determination module 42 is used to determine the felsic content of the target low-clay fine-grained mixed rock layer based on the △logR logging data, the compensated density logging data and the compensated neutron logging data of the target low-clay fine-grained mixed rock layer, combined with the rock component content determination model of the low-clay fine-grained mixed rock; wherein the rock component content determination model of the low-clay fine-grained mixed rock is a mathematical relationship model of the felsic content of the low-clay fine-grained mixed rock and the △logR data, the compensated density data and the compensated neutron data;

[0180] The carbonate content determination module 43 is used to determine the carbonate content of the target low-clay fine-grained mixed rock layer section based on the felsic content of the target low-clay fine-grained mixed rock layer section and in combination with the mathematical relationship model between the felsic content of the low-clay fine-grained mixed rock and the carbonate content;

[0181] The lithology determination module 44 is used to determine the lithology of the target low-clay fine-grained mixed rock layer section based on the felsic content and carbonate content of the target low-clay fine-grained mixed rock layer section.

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

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

[0184] When the felsic content of the target low-clay fine-grained mixed rock section is less than 75% and greater than or equal to 50%, the lithology of the target low-clay fine-grained mixed 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 rock section is less than 50% and greater than 25%, the lithology of the target low-clay fine-grained mixed rock section is defined as tuffaceous dolomite (a transitional lithology between tuff and dolomite);

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

[0187] In some embodiments, the rock component content determination model of low-clay fine-grained mixed rock is:

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

[0189] Where: V 长英质 is the felsic content of low-clay fine-grained mixed rock, in %; C DEN It is the compensated density logging data of low clay fine-grained mixed rock, unit is g / cm 3 ; C CN is the compensated neutron logging data of low-clay fine-grained mixed rock, unit: %; C △logR is the △logR logging data of low-clay fine-grained mixed rock, and the unit is dimensionless; β0, β1, β2, and β3 are coefficients, which can be obtained by calibrating the rock component content data and logging data of the low-clay fine-grained mixed rock core section;

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

[0191] In some embodiments, the device for determining the rock component content of low-clay fine-grained mixed rock further comprises:

[0192] The first model acquisition module 45 is used to obtain a rock component content determination model for low-clay fine-grained mixed rock;

[0193] Wherein, the first model acquisition module 45 includes:

[0194] Continuous coring section data acquisition submodule 451: used to obtain felsic content data, △logR logging data, compensated density logging data and compensated neutron logging data of continuous coring section of low clay fine-grained mixed rock;

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

[0196] Further, the first model determination submodule 452 includes:

[0197] The probability curve determining unit 4521 is used to determine the cumulative probability curve of the felsic content data of the continuous coring section of the low-clay fine-grained mixed rock, the cumulative probability curve of the △logR logging data, the cumulative probability curve of the compensated density logging data, and the cumulative probability curve of the compensated neutron logging data based on the felsic content data of the continuous coring section of the low-clay fine-grained mixed rock, the △logR logging data, the compensated density logging data, and the compensated neutron logging data;

[0198] The cumulative probability quantile corresponding data determining unit 4522 is used to determine the felsic content data, △logR logging data, compensated density logging data and compensated neutron logging data corresponding to multiple cumulative probability quantiles based on the cumulative probability curve of the felsic content data of the continuous coring section of the low-clay fine-grained mixed rock, the cumulative probability curve of the △logR logging data, the cumulative probability curve of the compensated density logging data and the cumulative probability curve of the compensated neutron logging data;

[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, a mathematical calculation formula of the felsic content of the low-clay fine-grained mixed rock with respect to the ΔlogR logging data, the compensated density logging data and the compensated neutron logging data is fitted, which is the rock component content determination model of the low-clay fine-grained mixed rock;

[0200] Further, in the process of 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 relationship model between the felsic content and the carbonate content of the low-clay fine-grained mixed rock is:

[0202] V 碳酸盐 =α1V 长英质 +α0

[0203] Where: V 长英质 V is the felsic content of low-clay fine-grained mixed rock, in %; 碳酸盐 is the carbonate content of low-clay fine-grained mixed rock, in %; α0 and α1 are coefficients, which can be obtained by calibrating the felsic content data and carbonate content data of the core of the low-clay fine-grained mixed rock coring section;

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

[0205] In some embodiments, the device for determining the rock component content of low-clay fine-grained mixed rock further comprises:

[0206] The second model acquisition module 46 is used to obtain a mathematical relationship model between the felsic content and the carbonate content of the low-clay fine-grained mixed rock;

[0207] Wherein, the second model acquisition module 46 includes:

[0208] Core data acquisition submodule 461: used to obtain the felsic content data and carbonate content data of the core of the low-clay fine-grained mixed rock coring section;

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

[0210] An embodiment of the present 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, the method for determining the rock component content of low-clay fine-grained mixed rock provided in an embodiment of the present invention is implemented.

[0211] The embodiment of 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, wherein when the processor executes the computer program, the lithology interpretation method of low-clay fine-grained mixed rock provided in the embodiment of the present invention is implemented.

[0212] The embodiments of this specification also provide a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the method for determining the rock component content of low-clay fine-grained mixed rock provided in the embodiments of the present invention is implemented.

[0213] The embodiments of this specification also provide a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the lithology interpretation method of low-clay fine-grained mixed rock provided in the embodiments of the present invention is implemented.

[0214] The embodiments of this specification also provide a computer program product, which includes a computer program. When the computer program is executed by a processor, it implements the method for determining the rock component content of low-clay fine-grained mixed rock provided in the embodiments of the present invention.

[0215] The embodiments of this specification also provide a computer program product, which includes a computer program. When the computer program is executed by a processor, the lithology interpretation method of low-clay fine-grained mixed rock provided in the embodiments of the present invention is implemented.

[0216] Example 1

[0217] This embodiment provides a lithology interpretation method for low-clay fine-grained mixed rock, wherein the method comprises:

[0218] 1. Obtain a model for determining the rock component content of low-clay fine-grained mixed rock, including:

[0219] Step (1) selecting a core of a continuous coring section of low-clay fine-grained mixed rock, conducting a correlation analysis between the rock component content and the well logging curve, and determining a well logging curve that can identify the main rock components of the low-clay fine-grained mixed rock.

[0220] ①Systematic observation and description of the continuous coring section of Well LY1, sampling every 10 cm, and conducting whole-rock X-ray diffraction and organic carbon test analysis to determine the mineral composition and content of each sample. Core analysis data show that (e.g. Figure 1A , Figure 1B As shown in Figure 2, the mineral components of the shale section include quartz, feldspar, calcite, dolomite, clay, analcime, pyrite, etc. Among them, the content of quartz + feldspar is 18%-94% (average 54%), the content of calcite + dolomite is 5%-82% (average 42%), and the content of clay is 0.1%-9% (average 1.6%). According to the mineral content, the rock components of Well LY1 are divided into two categories: felsic and carbonate. Felsic includes quartz and feldspar, and carbonate includes calcite and dolomite. The contents of the two are significantly negatively correlated, with a correlation coefficient of 0.94 (as shown in Figure 2). Figure 2 shown).

[0221] ② Obtain the logging curve of the continuous coring section of Well LY1, which includes natural gamma, acoustic time difference, compensated density logging data, compensated neutron, and ΔlogR curve calculated by overlapping acoustic time difference logging data and resistivity logging data. Carry out correlation analysis between rock minerals and logging curves. It can be seen from the comparative analysis of rock components and logging data (such as Figure 4 As shown in the figure, the correlation between felsic and carbonate contents and natural gamma and resistivity curves is poor. In comparison, there is a certain correlation between felsic and carbonate contents and acoustic time difference logging data, compensated density logging data, compensated neutron logging data and △logR logging data (the complex correlation coefficient is about 0.3). Therefore, acoustic time difference logging data, compensated density logging data, compensated neutron logging data and △logR logging data are preliminarily determined as logging curves that can identify the main rock components.

[0222] Step (2) analyzes the content of the main rock components and the numerical distribution characteristics of the logging curves in the continuous coring section, and selects rock components and logging curves with normal distribution rules as sensitive rock electrical parameters for the rock component content determination model of low-clay fine-grained mixed rock.

[0223] According to the mineral content and logging curve data of the whole rock X-ray diffraction analysis of the continuous coring section of Well LY1, the frequency distribution histograms and cumulative probability curves of the felsic content and carbonate content, as well as the frequency distribution histograms and cumulative probability curves of the acoustic time difference logging data, compensated density logging data, compensated neutron logging data, and △logR curve data were prepared. Analyze which parameters have normal distribution characteristics. It can be seen from each frequency distribution histogram that ( Figure 3 , Figure 5 ), among the rock component contents, the frequency distribution of felsic content has good normality, while the frequency distribution of carbonate content has poor normality; among the well logging curve data, the frequency distribution of compensated density has good normality, which is almost a straight line on the cumulative probability curve, followed by compensated neutron logging data and △logR logging data, while the frequency distribution of acoustic time difference logging data has poor normality. Therefore, compensated density logging data, △logR logging data, compensated neutron logging data, and felsic content are selected as sensitive rock electrical parameters for the model to determine the rock component content of low-clay fine-grained mixed rock.

[0224] Step (3) determines the felsic content data, ΔlogR logging data, compensated density logging data, and compensated neutron logging data corresponding to multiple cumulative probability quantiles based on the cumulative probability curve of the felsic content data of the continuous coring section of Well LY1, the cumulative probability curve of the ΔlogR logging data, the cumulative probability curve of the compensated density logging data, and the cumulative probability curve of the compensated neutron logging data.

[0225] From the cumulative probability curves of the felsic content data of the continuous coring section of Well LY1, the cumulative probability curves of the △logR logging data, the cumulative probability curves of the compensated density logging data and the cumulative probability curves of the compensated neutron logging data, the seven quantiles of cumulative probability quantiles of 2%, 10%, 30%, 50%, 70%, 90% and 98% were picked up by interpolation, and the felsic content data, △logR logging data, compensated density logging data and compensated neutron logging data corresponding to each cumulative probability quantile were determined. The results are shown in Table 1. Then, the correlation between the felsic content of each cumulative probability quantile and the compensated density logging data, compensated neutron logging data and △logR logging data was fitted respectively. The results are shown in Table 1. Figure 6 shown.

[0226] Table 1

[0227] Cumulative probability quantile Felsic content (%) <![CDATA[Compensated density (g / cm 3 )]]> Compensated 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 multivariate linear regression analysis on the felsic content data, △logR 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 the felsic content with respect to △logR logging data, compensated density logging data and compensated neutron logging data, which is a model for determining the rock component content of low-clay fine-grained mixed rock.

[0229] Taking the felsic content corresponding to each cumulative probability quantile as the dependent variable, and the compensated density logging data, compensated neutron logging data, and △logR logging data corresponding to each cumulative probability quantile as the independent variables, Python software was used to perform multiple regression on the felsic content and the compensated density logging data, compensated neutron logging data, and △logR logging values, and the relationship between the felsic content and each logging data was fitted. The mathematical calculation formula of the felsic content with respect to △logR logging data, compensated density logging data, and compensated neutron logging data was established, which is the rock component content determination model of low-clay fine-grained mixed rock:

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

[0231] Where: V 长英质 is the felsic content of low-clay fine-grained mixed rock, in %; C DEN It is the compensated density logging data of low clay fine-grained mixed rock, unit is g / cm 3 ; C CN is the compensated neutron logging data of low-clay fine-grained mixed rock, unit: %; C △logR It is the △logR logging data of low-clay fine-grained mixed rock, and the unit is dimensionless.

[0232] 2. Obtain the mathematical relationship model between the felsic content and carbonate content of low-clay fine-grained mixed rock, including:

[0233] The felsic content data and carbonate content data of the core of the coring section of the low-clay fine-grained mixed rock are obtained; based on the felsic content data and carbonate content data of the core of the coring section of the low-clay fine-grained mixed rock, a mathematical calculation formula for the felsic content of the carbonate content data of the low-clay fine-grained mixed rock is fitted, which is the mathematical relationship model between the felsic content and the carbonate content of the low-clay fine-grained mixed rock.

[0234] According to the felsic content and carbonate content of the continuous coring section of Well LY1, the mathematical calculation formula of carbonate content data for felsic content is fitted, which is the mathematical relationship model of felsic content and carbonate content in low-clay fine-grained mixed rock:

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

[0236] Where: V 长英质 V is the felsic content of low-clay fine-grained mixed rock, in %; 碳酸盐 It is the carbonate content of low-clay fine-grained mixed rock, in %.

[0237] 3. Obtain the △logR logging data, compensated density logging data and compensated neutron logging data of the target low-clay fine-grained mixed rock layer, i.e. the target layer of Well LU1.

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

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

[0240] -0.9893V 长英质 +95.172, the carbonate content of the target low-clay fine-grained mixed rock interval, i.e. the target interval of Well LU1, is determined. The results are as follows Figure 7 As shown, Figure 7 The carbonate content calculated by logging 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 highly consistent with the rock component contents obtained by core analysis, and the rock components are mainly felsic and carbonate.

[0242] 6. Based on the felsic content and carbonate content of the target low-clay fine-grained mixed rock interval, i.e., the target interval of Well LU1, the lithology of the target low-clay fine-grained mixed rock interval, i.e., the target interval of Well LU1, is determined using the following standards:

[0243] When the target low-clay fine-grained mixed rock interval, i.e. the target interval of Well LU1, has a felsic content of ≥75% and a carbonate content of ≤25%, the lithology of the target low-clay fine-grained mixed rock interval is defined as tuff;

[0244] When the felsic content of the target low-clay fine-grained mixed rock interval, i.e. the target interval of Well LU1, is less than 75% and greater than or equal to 50%, the lithology of the target low-clay fine-grained mixed rock interval is defined as dolomitic tuff (a transitional lithology between tuff and dolomite);

[0245] When the felsic content of the target low-clay fine-grained mixed rock interval, i.e. the target interval of Well LU1, is less than 50% and greater than 25%, the lithology of the target low-clay fine-grained mixed rock interval is defined as tuffaceous dolomite (a transitional lithology between tuff and dolomite);

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

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

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

[0249] Those skilled in the art will appreciate that this specification may be provided as a method, system, or computer program product. Therefore, this specification may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, this specification may take the form of a computer program product implemented 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 the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products of the embodiments of this specification. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. The computer can be a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

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

[0252] Those skilled in the art will understand that the description of each embodiment in this specification has its own emphasis. For parts not described in detail in a certain embodiment, reference can be made to the relevant description of other embodiments. In addition, it is understood that after reading this specification, those skilled in the art can think of any combination of some or all of the embodiments listed in this specification without creative work, and these combinations are also within the scope of disclosure and protection of this specification.

[0253] Although the present specification is described by way of examples, it is known to those skilled in the art that the above examples are only used to help understand the core idea of ​​the present specification. It is understood by those skilled in the art that there are many variations and changes in the present specification. It is hoped that the appended claims include these variations and changes without departing from the spirit of the present specification.

Claims

1. A method for determining the rock component content of low-clay fine-grained mixed rock, wherein: The method includes: Obtain △logR logging data, compensated density logging data and compensated neutron logging data of the target low-clay fine-grained mixed rock layer; Based on the △logR logging data, compensated density logging data and compensated neutron logging data of the target low-clay fine-grained mixed rock section, combined with the rock component content determination model of the low-clay fine-grained mixed rock, the felsic content of the target low-clay fine-grained mixed rock section is determined; wherein, the rock component content determination model of the low-clay fine-grained mixed rock is a mathematical relationship model between the felsic content of the low-clay fine-grained mixed rock and the △logR data, compensated density data and compensated neutron data; Optionally, the carbonate content of the target low-clay fine-grained mixed rock section is determined based on the felsic content of the target low-clay fine-grained mixed rock section and in combination with a mathematical relationship model between the felsic content and the carbonate content of the low-clay fine-grained mixed rock section.

2. The method according to claim 1, wherein: The model for determining the rock component content of low-clay fine-grained mixed rock is: V 长英质 =β0+β1·C DEN +β2·C CN +β3·C △logR Where: V 长英质 is the felsic content of low-clay fine-grained mixed rock, in %; C DEN It is the compensated density logging data of low clay fine-grained mixed rock, unit is g / cm 3 ; C CN is the compensated neutron logging data of low-clay fine-grained mixed rock, unit: %; C △logR is the △logR logging data of low-clay fine-grained mixed rock, and the unit is dimensionless; β0, β1, β2, and β3 are coefficients.

3. The method according to claim 1 or 2, wherein: The method for determining the rock component content of low-clay fine-grained mixed rock also includes: obtaining a rock component content determination model for low-clay fine-grained mixed rock; Among them, the model for determining the rock component content of low-clay fine-grained mixed rock includes: Obtain the felsic content data, △logR logging data, compensated density logging data and compensated neutron logging data of the continuous coring section of low-clay fine-grained mixed rock; Based on the felsic content data of the continuous coring section of the low-clay fine-grained mixed rock, △logR logging data, compensated density logging data and compensated neutron logging data, the mathematical calculation formula of the felsic content of the low-clay fine-grained mixed rock with respect to the △logR logging data, the compensated density logging data and the compensated neutron logging data is fitted, which is the rock component content determination model of the low-clay fine-grained mixed rock; Preferably, based on the felsic content data of the continuous coring section of the low-clay fine-grained mixed rock, ΔlogR logging data, compensated density logging data and compensated neutron logging data, the mathematical calculation formula of the felsic content of the low-clay fine-grained mixed rock with respect to ΔlogR logging data, compensated density logging data and compensated neutron logging data is fitted, that is, the rock component content determination model of the low-clay fine-grained mixed rock includes: Based on the felsic content data, △logR logging data, compensated density logging data and compensated neutron logging data of the continuous coring section of the low-clay fine-grained mixed rock, the cumulative probability curve of the felsic content data, the cumulative probability curve of the △logR logging data, the cumulative probability curve of the compensated density logging data and the cumulative probability curve of the compensated neutron logging data of the continuous coring section of the low-clay fine-grained mixed rock are determined; Based on the cumulative probability curve of felsic content data of the continuous coring section of low-clay fine-grained mixed rock, the cumulative probability curve of △logR logging data, the cumulative probability curve of compensated density logging data and the cumulative probability curve of compensated neutron logging data, the felsic content data, △logR logging data, compensated density logging data and compensated neutron logging data corresponding to multiple cumulative probability quantiles are determined; Based on the felsic content data, △logR 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 low-clay fine-grained mixed rock with respect to △logR 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 rock.

4. The method according to claim 1, wherein: The mathematical relationship model between the felsic content and carbonate content of low-clay fine-grained mixed rock is: V 碳酸盐 =α1V 长英质 +a0 Where: V 长英质 V is the felsic content of low-clay fine-grained mixed rock, in %; 碳酸盐 is the carbonate content of low-clay fine-grained mixed rock, in %; α0 and α1 are coefficients.

5. The method according to claim 1 or 4, wherein: The method for determining the rock component content of the low-clay fine-grained mixed rock also includes: obtaining a mathematical relationship model between the felsic content and the carbonate content of the low-clay fine-grained mixed rock; Among them, the mathematical relationship model between the felsic content and carbonate content of low-clay fine-grained mixed rocks includes: Obtain the felsic content data and carbonate content data of the core of the low-clay fine-grained mixed rock coring section; Based on the felsic content data and carbonate content data of the core of the coring section of the low-clay fine-grained mixed rock, the mathematical calculation formula for the felsic content of the carbonate content data of the low-clay fine-grained mixed rock is fitted, which is the mathematical relationship model between the felsic content and the carbonate content of the low-clay fine-grained mixed rock.

6. A lithological interpretation method for low-clay fine-grained mixed rock, wherein: The method includes: Determine the felsic content and carbonate content of the target low-clay fine-grained mixed rock layer section using the rock component content determination method of low-clay fine-grained mixed rock according to any one of claims 1 to 5; The lithology of the target low-clay fine-grained mixed rock section is determined based on the felsic content and carbonate content of the target low-clay fine-grained mixed rock section.

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

8. A device for determining the rock component content of low-clay fine-grained mixed rock, wherein: The device includes: Target layer data acquisition module: used to obtain △logR logging data, compensated density logging data and compensated neutron logging data of the target low-clay fine-grained mixed rock layer; The module for determining the felsic content is used to determine the felsic content of the target low-clay fine-grained mixed rock section based on the △logR logging data, compensated density logging data and compensated neutron logging data of the target low-clay fine-grained mixed rock section, combined with the rock component content determination model of the low-clay fine-grained mixed rock; wherein, the rock component content determination model of the low-clay fine-grained mixed rock is a mathematical relationship model between the felsic content of the low-clay fine-grained mixed rock and the △logR data, compensated density data and compensated neutron data; Optionally, the carbonate content determination module is used to determine the carbonate content of the target low-clay fine-grained mixed rock segment based on the felsic content of the target low-clay fine-grained mixed rock segment and a mathematical relationship model between the felsic content and the carbonate content of the low-clay fine-grained mixed rock segment.

9. The device according to claim 8, wherein: The model for determining the rock component content of low-clay fine-grained mixed rock is: V 长英质 =β0+β1·C DEN +β2·C CN +β3·C △logR Where: V 长英质 is the felsic content of low-clay fine-grained mixed rock, in %; C DEN It is the compensated density logging data of low clay fine-grained mixed rock, unit is g / cm 3 ; C CN is the compensated neutron logging data of low-clay fine-grained mixed rock, unit: %; C △logR is the △logR logging data of low-clay fine-grained mixed rock, the unit is dimensionless; β0, β1, β2, β3 are coefficients; The mathematical relationship model between the felsic content and carbonate content of low-clay fine-grained mixed rock is: V 碳酸盐 =α1V 长英质 +a0 Where: V 长英质 V is the felsic content of low-clay fine-grained mixed rock, in %; 碳酸盐 is the carbonate content of low-clay fine-grained mixed rock, in %; α0 and α1 are coefficients.

10. A lithology interpretation device for low-clay fine-grained mixed rock, wherein the device comprises: The rock component content determination device of low-clay fine-grained mixed rock according to claim 8 or 9: used to determine the felsic content and carbonate content of the target low-clay fine-grained mixed rock layer section; Lithology determination module: used to determine the lithology of the target low-clay fine-grained mixed rock layer based on the felsic content and carbonate content of the target low-clay fine-grained mixed rock layer; Preferably, the lithology of the target low-clay fine-grained mixed rock layer is determined by the following criteria: When the felsic content of the target low-clay fine-grained mixed rock section is ≥75% and the carbonate content is ≤25%, the lithology of the target low-clay fine-grained mixed rock section is defined as tuff; When the felsic content of the target low-clay fine-grained mixed rock section is less than 75% and greater than or equal to 50%, the lithology of the target low-clay fine-grained mixed rock section is determined to be dolomitic tuff; When the felsic content of the target low-clay fine-grained mixed rock section is less than 50% and greater than 25%, the lithology of the target low-clay fine-grained mixed rock section is determined to be tuffaceous dolomite; When the felsic content of the target low-clay fine-grained mixed rock section is ≤25% and the carbonate content is ≥75%, the lithology of the target low-clay fine-grained mixed rock section is determined to be dolomite.

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