Method and device for quick division of deep stratum while drilling

Abstract

This invention provides a method and apparatus for rapid deep stratigraphic delineation during drilling, belonging to the field of geological analysis technology. The method includes: obtaining the chloride and carbonate contents of rock cuttings samples from multiple sampling points; sorting the rock cuttings samples based on their collection depth to obtain sorted data; obtaining a chloride content variation sequence with collection depth based on the chloride content of each rock cutting sample in the sorted data; obtaining a carbonate content variation sequence with collection depth based on the carbonate content of each rock cutting sample in the sorted data; and obtaining the stratigraphic delineation result based on the chloride content and chloride content variation sequence with collection depth, as well as the carbonate content and carbonate content variation sequences with collection depth of each rock cutting sample. This invention achieves rapid stratigraphic delineation based on the chloride and carbonate contents of rock cuttings samples, and the method is simple and highly accurate.

Description

Technical Field

[0001] This invention relates to the field of geological analysis technology, specifically to a method for rapid segmentation of deep formations while drilling, a device for rapid segmentation of deep formations while drilling, an electronic device, and a readable storage medium. Background Technology

[0002] Stratigraphic framework delineation, as a fundamental research component in geological exploration, is essential for understanding regional geological background, tectonic evolution characteristics, sedimentary system studies, reservoir characteristic analysis, source rock evaluation, and the establishment of hydrocarbon accumulation models. It has long relied on delineation techniques based on biostratigraphy, lithological stratigraphy, and electrical properties. These techniques have played a crucial role in shallow and intermediate stratigraphic delineation, establishing the basic stratigraphic framework for various oilfields. In oilfields at the intermediate to advanced exploration stages, the discovery and reserve reporting of conventional oil and gas reservoirs in shallow and intermediate layers have been largely completed. The exploration focus then shifts to deep, low-permeability, tight, and unconventional exploration areas. Generally, 3500m is considered the boundary between shallow and intermediate layers and deep layers; depths greater than 3500m are considered deep exploration areas. Deep exploration is driven not only by economic factors but, more importantly, by the significant challenges involved. For example, seismic interpretation can identify strata up to 20m deep in shallow and intermediate layers, while in deep layers, strata exceeding 200m can be identified. Furthermore, the actual drilling and seismic interpretation stratigraphic agreement rate is only 60%. Meanwhile, because deep sediments are generally inherited, equivalent to deep-lake and semi-deep-lake sediments in geological history, the sediments are relatively fine and lack distinctive lithologies such as gravel layers, red beds, carbonate rocks, and volcanic rocks, making lithological stratigraphy lacking a basis. As strata deepen, diagenesis intensifies, and the evolution of paleontology such as pollen and algae increases, manifested in the disappearance of surface ornamentation, darkening of color, and shrinkage and shriveling of individual organisms; characteristics used for species identification gradually disappear.

[0003] The aforementioned problems directly lead to difficulties in delineating deep stratigraphic frameworks. Furthermore, additional unfavorable factors arise during drilling operations. Currently, PDC drill bits are commonly used in drilling. During deep drilling, the temperature at the drill bit's cutting edge is estimated to be above 600°C. This heat is rapidly transferred to the fine, broken rock cuttings, causing a rapid temperature rise in the cuttings and quenching of the drilling mud. This results in the rapid carbonization of fossils such as spores and algae, leaving no traceable fossils for analysis. From 3800m onwards, it becomes difficult to find identifiable fossils in the cuttings. However, fossils have been identified in core samples below 5000m, indicating their presence. The inability to analyze and identify them due to depth and drilling challenges necessitates finding more effective and reliable methods for stratigraphic delineation. More importantly, exploratory well drilling urgently requires lithological and stratigraphic information, necessitating rapid completion of analysis while drilling. Summary of the Invention

[0004] The purpose of this invention is to provide a method and apparatus for rapid deep formation segmentation during drilling, so as to at least solve the problems mentioned above regarding the seismic interpretation accuracy of conventional logging methods for deep oil and gas reservoirs, and the inability to achieve formation analysis and identification through paleontological methods due to drilling and other factors.

[0005] To achieve the above objectives, a first aspect of the present invention provides a method for rapid deep formation delineation during drilling, the method comprising: Obtain the chloride and carbonate contents of rock cuttings samples from multiple sampling points; Multiple rock cutting samples were sorted based on their collection depth to obtain sorted data. Based on the chloride content of each rock fragment sample in the sorted data, a sequence of chloride content variation with sampling depth was obtained. Based on the carbonate content of each rock fragment sample in the sorted data, a sequence of carbonate variation with sampling depth was obtained. Based on the chloride content and chloride variation sequence with sampling depth of each rock cutting sample, as well as the carbonate content and carbonate variation sequence with sampling depth of each rock cutting sample, stratigraphic division results were obtained.

[0006] Optionally, multiple rock cutting samples are sorted based on their collection depth to obtain sorted data, including: The rock cutting samples were sorted according to their collection depth from smallest to largest or from largest to smallest, resulting in sorted data.

[0007] Optionally, based on the chloride content and chloride variation sequence with sampling depth of each rock fragment sample, and the carbonate content and carbonate variation sequence with sampling depth of each rock fragment sample, stratigraphic division results are obtained, including: Based on the chloride content and chloride variation sequence with sampling depth of each rock fragment sample, as well as the carbonate content and carbonate variation sequence with sampling depth, the upper and lower boundaries of different strata were obtained. Stratigraphic division results are obtained based on the top and bottom boundaries between different strata.

[0008] Optionally, the stratigraphic division results include the Sha-3 strata, the Sha-4 strata, and the Mesozoic strata.

[0009] Optionally, based on the chloride content and chloride variation sequence with sampling depth of each rock fragment sample, and the carbonate content and carbonate variation sequence with sampling depth, the top and bottom boundaries of different strata are obtained, including: The first stratigraphic region is defined as the sampling depth where the chloride content is within the first preset chloride range and the fluctuation of the chloride content at adjacent sampling points in the sequence of chloride content changes with sampling depth is greater than the first preset chloride threshold. The second stratigraphic region is defined as the sampling depth where the carbonate content in the first stratigraphic region is within the first preset carbonate range, and the fluctuation of the carbonate content in the sequence of changes with sampling depth is greater than the first preset carbonate threshold. The top and bottom surfaces of the second stratigraphic region are taken as the top and bottom boundaries of the Sha-3 stratigraphic region.

[0010] Optionally, based on the chloride content and chloride variation sequence with sampling depth of each rock fragment sample, and the carbonate content and carbonate variation sequence with sampling depth, the upper and lower boundaries between different strata are obtained, including: The third stratigraphic region is defined as the sampling depth where the chloride content is within the second preset chloride range and the fluctuation of adjacent sampling points in the chloride content variation sequence with sampling depth is less than or equal to the first preset chloride threshold. The fourth stratum region is defined as the stratum region where the carbonate content in the third stratum region is within the second preset carbonate range, and the fluctuation of the carbonate content in the sequence of changes with the sampling depth is greater than the second preset carbonate threshold. The top and bottom surfaces of the fourth stratum region are taken as the top and bottom boundaries of the Sha-4 stratum.

[0011] Optionally, based on the chloride content and chloride variation sequence with sampling depth of each rock fragment sample, and the carbonate content and carbonate variation sequence with sampling depth, the upper and lower boundaries between different strata are obtained, including: The fifth stratigraphic region is defined as the sampling depth where the chloride content is in the third preset chloride range and the fluctuation of the chloride content in the sequence of chloride content changes with sampling depth is less than or equal to the first preset chloride threshold. The sixth stratum region is defined as the stratum region where the carbonate content in the fifth stratum region is within the third preset carbonate range, and the fluctuation of the carbonate content in the sequence of changes with the sampling depth is less than or equal to the third preset carbonate threshold. The top and bottom surfaces of the sixth stratigraphic region are taken as the top and bottom boundaries of the Mesozoic strata.

[0012] Optionally, the rock fragments are collected at preset intervals.

[0013] Optionally, the preset interval distance is 5-15m.

[0014] Optionally, the rock fragment samples include: mudstone samples or shale samples.

[0015] Optionally, the number of sampling points is at least 6, and the number of rock cutting samples at each sampling point is multiple; The chloride content of the rock cuttings samples at each sampling point is the average chloride content of all rock cuttings samples at that sampling point; The carbonate content of the rock debris samples at each sampling point is the average carbonate content of all rock debris samples at that sampling point.

[0016] A second aspect of the present invention also provides a rapid deep formation segmentation device while drilling, the device comprising: The parameter acquisition module is used to acquire the chloride and carbonate contents of rock cuttings samples from multiple sampling points; The data processing module is used to sort multiple rock cutting samples based on their collection depth to obtain sorted data. The first sequence determination module is used to obtain the sequence of chloride content changes with collection depth based on the chloride content of each rock cutting sample in the sorted data. The second sequence determination module is used to obtain the sequence of carbonate variation with collection depth based on the carbonate content of each rock fragment sample in the sorted data. The results output module is used to obtain stratigraphic division results based on the chloride content and chloride variation sequence with collection depth of each rock cutting sample, as well as the carbonate content and carbonate variation sequence with collection depth of each rock cutting sample.

[0017] Optionally, the data processing module is specifically used for: The rock cutting samples were sorted according to their collection depth from smallest to largest or from largest to smallest, resulting in sorted data.

[0018] Optionally, the result output module includes: The top and bottom boundary delineation module is used to obtain the top and bottom boundaries of different strata based on the chloride content and chloride variation sequence with sampling depth of each rock cutting sample, as well as the carbonate content and carbonate variation sequence with sampling depth. The stratigraphic division module is used to obtain stratigraphic division results based on the top and bottom boundaries between different strata.

[0019] Optionally, the stratigraphic division results include the Sha-3 strata, the Sha-4 strata, and the Mesozoic strata.

[0020] Optionally, the top and bottom boundary division module is specifically used for: The first stratigraphic region is defined as the sampling depth where the chloride content is within the first preset chloride range and the fluctuation of the chloride content at adjacent sampling points in the sequence of chloride content changes with sampling depth is greater than the first preset chloride threshold. The second stratigraphic region is defined as the sampling depth where the carbonate content in the first stratigraphic region is within the first preset carbonate range, and the fluctuation of the carbonate content in the sequence of changes with sampling depth is greater than the first preset carbonate threshold. The top and bottom surfaces of the second stratigraphic region are taken as the top and bottom boundaries of the Sha-3 stratigraphic region.

[0021] Optionally, the top and bottom boundary division module is specifically used for: The third stratigraphic region is defined as the sampling depth where the chloride content is within the second preset chloride range and the fluctuation of adjacent sampling points in the chloride content variation sequence with sampling depth is less than or equal to the first preset chloride threshold. The fourth stratum region is defined as the stratum region where the carbonate content in the third stratum region is within the second preset carbonate range, and the fluctuation of the carbonate content in the sequence of changes with the sampling depth is greater than the second preset carbonate threshold. The top and bottom surfaces of the fourth stratum region are taken as the top and bottom boundaries of the Sha-4 stratum.

[0022] Optionally, the top and bottom boundary division module is specifically used for: The fifth stratigraphic region is defined as the sampling depth where the chloride content is in the third preset chloride range and the fluctuation of the chloride content in the sequence of chloride content changes with sampling depth is less than or equal to the first preset chloride threshold. The sixth stratum region is defined as the stratum region where the carbonate content in the fifth stratum region is within the third preset carbonate range, and the fluctuation of the carbonate content in the sequence of changes with the sampling depth is less than or equal to the third preset carbonate threshold. The top and bottom surfaces of the sixth stratigraphic region are taken as the top and bottom boundaries of the Mesozoic strata.

[0023] A third aspect of the present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the above-described method for rapid deep formation segmentation while drilling.

[0024] On the other hand, the present invention also provides a readable storage medium storing instructions for causing a machine to perform the above-described method for rapid subdivision of deep formations while drilling.

[0025] This technical solution achieves rapid stratigraphic division based on the chloride content and chloride variation sequence with sampling depth of each rock cutting sample, as well as the carbonate content and carbonate variation sequence with sampling depth of each rock cutting sample. It requires less data, is simple in method, has high accuracy, and has a high seismic interpretation stratigraphic consistency rate.

[0026] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0027] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a flowchart of the method for rapid deep formation segmentation while drilling provided by the present invention; Figure 2 This is a flowchart of the process for obtaining stratigraphic division results provided by the present invention; Figure 3 This is the first scatter plot of chloride and carbonate content in different formations as a function of well depth provided by this invention; Figure 4 This is a scatter plot showing the variation of chloride and carbonate contents in different formations with well depth, as provided by the present invention. Figure 5 This is a structural block diagram of the rapid deep formation segmentation device provided by the present invention. Detailed Implementation

[0028] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0029] In the embodiments of the present invention, the terms "first", "second", "third", etc. are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0030] Figure 1 This is a flowchart of the method for rapid deep formation segmentation while drilling provided by the present invention; Figure 2 This is a flowchart of obtaining stratigraphic division results provided by the present invention; Figure 3 This is the first scatter plot of chloride and carbonate content in different formations as a function of well depth provided by this invention; Figure 4 This is a scatter plot showing the variation of chloride and carbonate contents in different formations with well depth, as provided by the present invention. Figure 5 This is a structural block diagram of the rapid deep formation segmentation device provided by the present invention.

[0031] Specifically, deep strata generally exhibit fine-grained sediments, with mudstone and shale being common. During the initial deposition of mudstone and shale, porosity can reach as high as 90%, with these pores filled with formation water. As overlying sediments accumulate and burial depth increases, porosity typically decreases to below 10% at deeper layers. The formation water in these pores remains in a state of drainage, undisturbed by external fluids, and retains the minerals released during the initial deposition and the diagenetic evolution of the mudstone itself. The mineralization and ion concentration of formation water in mudstone and shale are inherent characteristics, their levels primarily controlled by factors such as paleoclimate, provenance, depositional environment, tectonic sealing, and hydrodynamic conditions, and undergo slight changes with time, temperature, pressure, and other external factors during diagenetic evolution. Formation water mineralization shows a clear linear relationship with chloride content in mudstone. Chloride content in mudstone is a good indicator of the original water's properties; the chloride content in mudstone increases sequentially from freshwater lakes to saline lakes to brine lakes. The carbonate content in mudstone is mainly controlled by paleoclimate, provenance, sedimentary environment, and diagenetic evolution. Under arid conditions, with carbonate rock provenance, saline lakes, and strong diagenesis, the carbonate content is high, and vice versa. These two parameters form the basis of this method. The chlorides adsorbed and bound in mudstone and shale are free from external interference factors; the current carbonate content in mudstone and shale is formed by a combination of factors including paleoclimate, provenance, sedimentary environment, and diagenesis. The chloride and carbonate contents, and their distribution characteristics at burial depth, are direct evidence. Therefore, this invention analyzes the inherent and quantitative chloride and carbonate contents of mudstone and shale in various strata, establishes the chloride and carbonate content characteristics of each stratum, and conducts deep stratigraphic division based on the chloride and carbonate content and distribution characteristics. Two other advantages are that both experimental projects can be completed within one day using rock fragment samples. This method, applied in stratigraphic segmentation during deep drilling analysis, solves the problem of its inapplicability to biostratigraphy, lithological stratigraphy, and electrical stratigraphy segmentation techniques, making it a rapid and effective means of stratigraphic segmentation in deep exploration. Therefore, as... Figure 1 As shown, this invention provides a method for rapid deep formation delineation during drilling, the method comprising: Step 1: Obtain the chloride and carbonate contents of rock cuttings samples from multiple sampling points; Step 2: Sort multiple rock cutting samples based on their collection depth to obtain sorted data; Step 3: Based on the chloride content of each rock fragment sample in the sorted data, obtain the chloride content variation sequence with sampling depth; Step 4: Based on the carbonate content of each rock fragment sample in the sorted data, obtain the carbonate variation sequence with sampling depth; Step 5: Based on the chloride content and chloride variation sequence with sampling depth of each rock cutting sample, as well as the carbonate content and carbonate variation sequence with sampling depth of each rock cutting sample, the stratigraphic division results are obtained.

[0032] Specifically, in this embodiment, since the chloride and carbonate contents, as well as the variation patterns of chloride and carbonate contents with sampling depth, are completely different in different strata, this scheme analyzes the chloride and carbonate contents of collected rock fragment samples. Based on the chloride content and chloride variation sequence with sampling depth of each rock fragment sample, as well as the carbonate content and carbonate variation sequence with sampling depth of each rock fragment sample, stratigraphic division results can be obtained. Furthermore, this method enables rapid stratigraphic division with small data volume, simple method, high accuracy, and high seismic interpretation stratigraphic consistency.

[0033] More specifically, the above scheme is a method for determining the stratigraphic position for a single sampling well. When it is necessary to divide the strata in a region, sampling wells are set up at preset intervals to collect rock cuttings. Furthermore, the above scheme is used to analyze each sampling well to obtain the stratigraphic division structure corresponding to each sampling well. Then, by connecting the same strata in sequence in a radial manner from the center to the edge, the distribution of strata in the region can be determined.

[0034] Furthermore, multiple rock cutting samples were sorted based on their collection depth to obtain sorted data, including: The rock cutting samples were sorted according to their collection depth from smallest to largest or from largest to smallest, resulting in sorted data.

[0035] Specifically, in this embodiment, the rock cutting samples are sorted in ascending order of collection depth or in descending order of collection depth to obtain sorted data, thereby characterizing the variation pattern of the rock cutting samples and enabling subsequent stratigraphic division.

[0036] Furthermore, based on the chloride content and chloride variation sequence with sampling depth of each rock fragment sample, and the carbonate content and carbonate variation sequence with sampling depth of each rock fragment sample, stratigraphic division results were obtained, such as... Figure 2 As shown, it includes: S51. Based on the chloride content and chloride variation sequence with sampling depth of each rock fragment sample, as well as the carbonate content and carbonate variation sequence with sampling depth, the upper and lower boundaries of different strata are obtained. S52. Based on the top and bottom boundaries between different strata, the stratigraphic division results are obtained.

[0037] Specifically, in this embodiment, the chloride content and its variation, as well as the carbonate content and its variation, are similar in each identical stratum. Therefore, the top and bottom boundaries of different strata can be accurately determined based on the chloride content and its variation with sampling depth, as well as the carbonate content and its variation with sampling depth of each rock fragment sample, thereby achieving rapid stratigraphic division.

[0038] Furthermore, the stratigraphic division results include the Sha-3 strata, the Sha-4 strata, and the Mesozoic strata.

[0039] Furthermore, based on the chloride content and chloride variation sequence with sampling depth of each rock fragment sample, as well as the carbonate content and carbonate variation sequence with sampling depth, the upper and lower boundaries of different strata were obtained, including: The first stratigraphic region is defined as the sampling depth where the chloride content is within the first preset chloride range and the fluctuation of the chloride content at adjacent sampling points in the sequence of chloride content changes with sampling depth is greater than the first preset chloride threshold. The second stratigraphic region is defined as the sampling depth where the carbonate content in the first stratigraphic region is within the first preset carbonate range, and the fluctuation of the carbonate content in the sequence of changes with sampling depth is greater than the first preset carbonate threshold. The top and bottom surfaces of the second stratigraphic region are taken as the top and bottom boundaries of the Sha-3 stratigraphic region.

[0040] Furthermore, based on the chloride content and chloride variation sequence with sampling depth of each rock fragment sample, as well as the carbonate content and carbonate variation sequence with sampling depth, the upper and lower boundaries between different strata were obtained, including: The third stratigraphic region is defined as the sampling depth where the chloride content is within the second preset chloride range and the fluctuation of adjacent sampling points in the chloride content variation sequence with sampling depth is less than or equal to the first preset chloride threshold. The fourth stratum region is defined as the stratum region where the carbonate content in the third stratum region is within the second preset carbonate range, and the fluctuation of the carbonate content in the sequence of changes with the sampling depth is greater than the second preset carbonate threshold. The top and bottom surfaces of the fourth stratum region are taken as the top and bottom boundaries of the Sha-4 stratum.

[0041] Furthermore, based on the chloride content and chloride variation sequence with sampling depth of each rock fragment sample, as well as the carbonate content and carbonate variation sequence with sampling depth, the upper and lower boundaries between different strata were obtained, including: The fifth stratigraphic region is defined as the sampling depth where the chloride content is in the third preset chloride range and the fluctuation of the chloride content in the sequence of chloride content changes with sampling depth is less than or equal to the first preset chloride threshold. The sixth stratum region is defined as the stratum region where the carbonate content in the fifth stratum region is within the third preset carbonate range, and the fluctuation of the carbonate content in the sequence of changes with the sampling depth is less than or equal to the third preset carbonate threshold. The top and bottom surfaces of the sixth stratigraphic region are taken as the top and bottom boundaries of the Mesozoic strata.

[0042] Specifically, for three different strata (Sand III strata, Sand IV strata, and Mesozoic strata), the above three schemes can achieve rapid stratigraphic division with small data volume, simple methods, high accuracy, and high consistency with seismic interpretation of stratigraphy. Among them, there is no data correlation between the first and third preset chloride intervals, while the minimum value in the second preset chloride interval is located within the first preset chloride interval, and the maximum value in the second preset chloride interval is located within the third preset chloride interval. Furthermore, the first preset carbonate interval has the widest range, the second preset carbonate interval is located within the first preset carbonate interval (a sub-interval of the first preset carbonate interval), and the third preset carbonate interval is located within the second preset carbonate interval (a sub-interval of the second preset carbonate interval).

[0043] Furthermore, the rock fragment samples are collected at preset intervals.

[0044] Furthermore, the preset interval distance is 5-15m.

[0045] Specifically, in this embodiment, the spacing between sampling points is set to 5-15m, which can be adjusted according to the actual sampling situation to ensure that the number of rock fragment samples collected is sufficient, thereby ensuring the accuracy of subsequent stratigraphic division.

[0046] Furthermore, the rock fragment samples include mudstone samples or shale samples.

[0047] Furthermore, the number of sampling points is at least 6, and the number of rock fragment samples at each sampling point is multiple; The chloride content of the rock cuttings samples at each sampling point is the average chloride content of all rock cuttings samples at that sampling point; The carbonate content of the rock debris samples at each sampling point is the average carbonate content of all rock debris samples at that sampling point.

[0048] Specifically, in this implementation, the number of sampling points is at least six, and can be adjusted according to the actual sampling situation to ensure that the number of rock cutting samples collected is sufficient, thereby ensuring the accuracy of subsequent stratigraphic division. Furthermore, to avoid inaccurate stratigraphic judgment due to random errors at each sampling point and to reduce the impact of random errors from single sample data, multiple rock cutting samples are collected at each sampling point. For each sampling point, the average chloride content of all rock cutting samples at that sampling point is taken as the chloride content of the rock cutting sample at that sampling point; similarly, the average carbonate content of all rock cutting samples at that sampling point is taken as the carbonate content of the rock cutting sample at that sampling point.

[0049] In one specific implementation method, taking the deep stratigraphic division of a certain well as an example, the method of stratigraphic division based on chloride and carbonate content is explained in detail. This well is a high-risk exploration well, and the deep strata cannot be divided according to seismic interpretation. The lithology lacks particularly indicative lithologies, and the analyzed pollinic algae fossils are few, and the carbonization and analysis identification processes are lengthy, making species identification impossible and failing to meet the requirements of analysis while drilling. Therefore, there is an urgent need to establish a new and reliable method for stratigraphic division and to build a stratigraphic framework to lay the foundation for further exploration.

[0050] Based on the established stratigraphic divisions in the shallow and intermediate layers, the chloride and carbonate content and distribution characteristics were established. Secondly, based on the chloride and carbonate content analysis results of a key exploration well sample mainly composed of rock cuttings, a scatter plot was created relative to well depth. Figure 3-4 As shown in Table 1, the boundaries of the three stratigraphic units are clearly indicated. Each time, at least one rock fragment sample was selected every 10 meters, with a minimum of six samples used for stratigraphic division, and the process was completed within one day. Based on stratigraphic division criteria such as shallow and medium-depth seismic activity, paleontological analysis and identification, and lithological analysis, core and rock fragment samples were selected for chloride and carbonate content analysis. Samples were selected at a density of one 10-meter block, and chloride and carbonate content analysis was conducted on the superimposed stratigraphic units to establish the chloride and carbonate content and distribution characteristics of each stratigraphic unit. The portion of mudstone and shale with chloride content ranging from 0 to 40 mg / kg (first preset chloride range), with an average of 20 mg / kg, and exhibiting significant fluctuations with burial depth (the fluctuations in chloride content at adjacent sampling points in the sequence of changes with sampling depth are all greater than the first preset chloride threshold); and the portion of mudstone and shale with carbonate content ranging from 0 to 90% (first preset carbonate range), with an average of 10%, and exhibiting significant fluctuations with burial depth (the fluctuations in carbonate content at adjacent sampling points in the sequence of changes with sampling depth are all greater than the first preset carbonate threshold), was identified as stratum one (i.e., the Sha-3 stratum). The portion of mudstone and shale with chloride content ranging from 7 to 180 mg / kg (second preset chloride range), with an average of 55 mg / kg, showing relatively small fluctuations with burial depth (the amount of variation in chloride content between adjacent sampling points in the sequence of changes with sampling depth); and the portion of mudstone and shale with carbonate content ranging from 0 to 85% (second preset carbonate range), with an average of 22%, showing relatively large fluctuations with burial depth (the amount of variation in carbonate content between adjacent sampling points in the sequence of changes with sampling depth is greater than the second preset carbonate threshold) was identified as stratum two (i.e., Sha-4 stratum). The portions of mudstone and shale with chloride content ranging from 60 to 220 mg / kg (third preset chloride range), with an average of 95 mg / kg, and exhibiting minimal fluctuations with burial depth (the variation in chloride content between adjacent sampling points in the sampling depth variation sequence is less than or equal to the first preset chloride threshold); and the portions of mudstone and shale with carbonate content ranging from 0 to 12% (third preset carbonate range), with an average of 6%, and exhibiting minimal fluctuations with burial depth (the variation in carbonate content between adjacent sampling points in the sampling depth variation sequence is less than or equal to the third preset carbonate threshold) are identified as strata three (i.e., Mesozoic strata). Table 1. Statistical table of chloride and carbonate contents in major stratigraphic units

[0051] like Figure 5 As shown, this invention also provides a rapid deep formation segmentation device while drilling, the device comprising: The parameter acquisition module is used to acquire the chloride and carbonate contents of rock cuttings samples from multiple sampling points; The data processing module is used to sort multiple rock cutting samples based on their collection depth to obtain sorted data. The first sequence determination module is used to obtain the sequence of chloride content changes with collection depth based on the chloride content of each rock cutting sample in the sorted data. The second sequence determination module is used to obtain the sequence of carbonate variation with collection depth based on the carbonate content of each rock fragment sample in the sorted data. The results output module is used to obtain stratigraphic division results based on the chloride content and chloride variation sequence with collection depth of each rock cutting sample, as well as the carbonate content and carbonate variation sequence with collection depth of each rock cutting sample.

[0052] Furthermore, the data processing module is specifically used for: The rock cutting samples were sorted according to their collection depth from smallest to largest or from largest to smallest, resulting in sorted data.

[0053] Furthermore, the result output module includes: The top and bottom boundary delineation module is used to obtain the top and bottom boundaries of different strata based on the chloride content and chloride variation sequence with sampling depth of each rock cutting sample, as well as the carbonate content and carbonate variation sequence with sampling depth. The stratigraphic division module is used to obtain stratigraphic division results based on the top and bottom boundaries between different strata.

[0054] Furthermore, the stratigraphic division results include the Sha-3 strata, the Sha-4 strata, and the Mesozoic strata.

[0055] Furthermore, the top and bottom boundary division module is specifically used for: The first stratigraphic region is defined as the sampling depth where the chloride content is within the first preset chloride range and the fluctuation of the chloride content at adjacent sampling points in the sequence of chloride content changes with sampling depth is greater than the first preset chloride threshold. The second stratigraphic region is defined as the sampling depth where the carbonate content in the first stratigraphic region is within the first preset carbonate range, and the fluctuation of the carbonate content in the sequence of changes with sampling depth is greater than the first preset carbonate threshold. The top and bottom surfaces of the second stratigraphic region are taken as the top and bottom boundaries of the Sha-3 stratigraphic region.

[0056] Furthermore, the top and bottom boundary division module is specifically used for: The third stratigraphic region is defined as the sampling depth where the chloride content is within the second preset chloride range and the fluctuation of adjacent sampling points in the chloride content variation sequence with sampling depth is less than or equal to the first preset chloride threshold. The fourth stratum region is defined as the stratum region where the carbonate content in the third stratum region is within the second preset carbonate range, and the fluctuation of the carbonate content in the sequence of changes with the sampling depth is greater than the second preset carbonate threshold. The top and bottom surfaces of the fourth stratum region are taken as the top and bottom boundaries of the Sha-4 stratum.

[0057] Furthermore, the top and bottom boundary division module is specifically used for: The fifth stratigraphic region is defined as the sampling depth where the chloride content is in the third preset chloride range and the fluctuation of the chloride content in the sequence of chloride content changes with sampling depth is less than or equal to the first preset chloride threshold. The sixth stratum region is defined as the stratum region where the carbonate content in the fifth stratum region is within the third preset carbonate range, and the fluctuation of the carbonate content in the sequence of changes with the sampling depth is less than or equal to the third preset carbonate threshold. The top and bottom surfaces of the sixth stratigraphic region are taken as the top and bottom boundaries of the Mesozoic strata.

[0058] This invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the above-described method for rapid deep formation segmentation while drilling.

[0059] This invention also provides a readable storage medium storing instructions for causing a machine to execute the above-described method for rapid deep formation segmentation while drilling.

[0060] Those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. This program is stored in a storage medium and includes several instructions to cause a microcontroller, chip, or processor to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0061] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy distinction and are not intended to limit the scope of protection of this invention.

[0062] The optional embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details described above. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the protection scope of the embodiments of the present invention. It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not further describe the various possible combinations.

[0063] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the embodiments of the present invention, they should also be regarded as the content disclosed by the embodiments of the present invention.

Claims

1. A method for fast division of deep formation while drilling, characterized in that, The method includes: Obtain the chloride and carbonate contents of rock cuttings samples from multiple sampling points; Multiple rock cutting samples were sorted based on their collection depth to obtain sorted data. Based on the chloride content of each rock fragment sample in the sorted data, a sequence of chloride content variation with sampling depth was obtained. Based on the carbonate content of each rock fragment sample in the sorted data, a sequence of carbonate variation with sampling depth was obtained. Based on the chloride content and chloride variation sequence with sampling depth of each rock cutting sample, as well as the carbonate content and carbonate variation sequence with sampling depth of each rock cutting sample, stratigraphic division results were obtained.

2. The method of claim 1, wherein, Multiple rock cuttings samples were sorted based on their collection depth to obtain sorted data, including: The rock cutting samples were sorted according to their collection depth from smallest to largest or from largest to smallest, resulting in sorted data.

3. The method of claim 1, wherein, Based on the chloride content and chloride variation sequence with sampling depth of each rock cutting sample, and the carbonate content and carbonate variation sequence with sampling depth of each rock cutting sample, stratigraphic division results were obtained, including: Based on the chloride content and chloride variation sequence with sampling depth of each rock fragment sample, as well as the carbonate content and carbonate variation sequence with sampling depth, the upper and lower boundaries of different strata were obtained. Stratigraphic division results are obtained based on the top and bottom boundaries between different strata.

4. The method of claim 3, wherein, The stratigraphic division results include the Sha-3 strata, the Sha-4 strata, and the Mesozoic strata.

5. The method of claim 4, wherein, Based on the chloride content and chloride variation sequence with sampling depth of each rock cutting sample, as well as the carbonate content and carbonate variation sequence with sampling depth, the upper and lower boundaries of different strata were obtained, including: The first stratigraphic region is defined as the sampling depth where the chloride content is within the first preset chloride range and the fluctuation of adjacent sampling points in the chloride content variation sequence with sampling depth is greater than the first preset chloride threshold. The second stratigraphic region is defined as the sampling depth where the carbonate content in the first stratigraphic region is within the first preset carbonate range, and the fluctuation of the carbonate content in the sequence of changes with sampling depth is greater than the first preset carbonate threshold. The top and bottom surfaces of the second stratigraphic region are taken as the top and bottom boundaries of the Sha-3 stratigraphic region.

6. The method of claim 4, wherein, Based on the chloride content and chloride variation sequence with sampling depth of each rock cutting sample, as well as the carbonate content and carbonate variation sequence with sampling depth, the upper and lower boundaries between different strata were obtained, including: The third stratigraphic region is defined as the sampling depth where the chloride content is within the second preset chloride range and the fluctuation of the chloride content at adjacent sampling points in the sequence of chloride content changes with sampling depth is less than or equal to the first preset chloride threshold. The fourth stratum region is defined as the stratum region where the carbonate content in the third stratum region is within the second preset carbonate range, and the fluctuation of the carbonate content in the sequence of changes with the sampling depth is greater than the second preset carbonate threshold. The top and bottom surfaces of the fourth stratum region are taken as the top and bottom boundaries of the Sha-4 stratum.

7. The method of claim 4, wherein, Based on the chloride content and chloride variation sequence with sampling depth of each rock cutting sample, as well as the carbonate content and carbonate variation sequence with sampling depth, the upper and lower boundaries between different strata were obtained, including: The fifth stratigraphic region is defined as the sampling depth where the chloride content is in the third preset chloride range and the fluctuation of the chloride content in the sequence of chloride content changes with sampling depth is less than or equal to the first preset chloride threshold. The sixth stratum region is defined as the stratum region where the carbonate content in the fifth stratum region is within the third preset carbonate range, and the fluctuation of the carbonate content in the sequence of changes with the sampling depth is less than or equal to the third preset carbonate threshold. The top and bottom surfaces of the sixth stratigraphic region are taken as the top and bottom boundaries of the Mesozoic strata.

8. The method of claim 1, wherein, The rock fragments were collected at preset intervals.

9. The method of claim 8, wherein, The preset interval distance is 5-15m.

10. The method of claim 1, wherein, The rock fragment samples include mudstone samples or shale samples.

11. The method of claim 1, wherein, The number of sampling points is at least 6, and the number of rock fragment samples at each sampling point is multiple; The chloride content of the rock cuttings samples at each sampling point is the average chloride content of all rock cuttings samples at that sampling point; The carbonate content of the rock debris samples at each sampling point is the average carbonate content of all rock debris samples at that sampling point.

12. A device for rapid division of deep formation while drilling, characterized in that, The device includes: The parameter acquisition module is used to acquire the chloride and carbonate contents of rock cuttings samples from multiple sampling points; The data processing module is used to sort multiple rock cutting samples based on their collection depth to obtain sorted data. The first sequence determination module is used to obtain the sequence of chloride content changes with collection depth based on the chloride content of each rock fragment sample in the sorted data. The second sequence determination module is used to obtain the sequence of carbonate variation with collection depth based on the carbonate content of each rock fragment sample in the sorted data. The results output module is used to obtain stratigraphic division results based on the chloride content and chloride variation sequence with collection depth of each rock cutting sample, as well as the carbonate content and carbonate variation sequence with collection depth of each rock cutting sample.

13. The apparatus of claim 12, wherein, The data processing module is specifically used for: The rock cutting samples were sorted according to their collection depth from smallest to largest or from largest to smallest, resulting in sorted data.

14. The apparatus of claim 12, wherein, The result output module includes: The top and bottom boundary delineation module is used to obtain the top and bottom boundaries of different strata based on the chloride content and chloride variation sequence with sampling depth of each rock cutting sample, as well as the carbonate content and carbonate variation sequence with sampling depth. The stratigraphic division module is used to obtain stratigraphic division results based on the top and bottom boundaries between different strata.

15. The apparatus of claim 14, wherein, The stratigraphic division results include the Sha-3 strata, the Sha-4 strata, and the Mesozoic strata.

16. The apparatus of claim 15, wherein, The top and bottom boundary division module is specifically used for: The first stratigraphic region is defined as the sampling depth where the chloride content is within the first preset chloride range and the fluctuation of adjacent sampling points in the chloride content variation sequence with sampling depth is greater than the first preset chloride threshold. The second stratigraphic region is defined as the sampling depth where the carbonate content in the first stratigraphic region is within the first preset carbonate range, and the fluctuation of the carbonate content in the sequence of changes with sampling depth is greater than the first preset carbonate threshold. The top and bottom surfaces of the second stratigraphic region are taken as the top and bottom boundaries of the Sha-3 stratigraphic region.

17. The apparatus of claim 15, wherein, The top and bottom boundary division module is specifically used for: The third stratigraphic region is defined as the sampling depth where the chloride content is within the second preset chloride range and the fluctuation of the chloride content at adjacent sampling points in the sequence of chloride content changes with sampling depth is less than or equal to the first preset chloride threshold. The fourth stratum region is defined as the stratum region where the carbonate content in the third stratum region is within the second preset carbonate range, and the fluctuation of the carbonate content in the sequence of changes with the sampling depth is greater than the second preset carbonate threshold. The top and bottom surfaces of the fourth stratum region are taken as the top and bottom boundaries of the Sha-4 stratum.

18. The apparatus of claim 15, wherein, The top and bottom boundary division module is specifically used for: The fifth stratigraphic region is defined as the sampling depth where the chloride content is in the third preset chloride range and the fluctuation of the chloride content in the sequence of chloride content changes with sampling depth is less than or equal to the first preset chloride threshold. The sixth stratum region is defined as the stratum region where the carbonate content in the fifth stratum region is within the third preset carbonate range, and the fluctuation of the carbonate content in the sequence of changes with the sampling depth is less than or equal to the third preset carbonate threshold. The top and bottom surfaces of the sixth stratigraphic region are taken as the top and bottom boundaries of the Mesozoic strata.

19. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method for rapid deep formation segmentation during drilling as described in any one of claims 1-11.

20. A readable storage medium, characterized by, The readable storage medium stores instructions for causing a machine to perform the rapid deep formation partitioning method as described in any one of claims 1-11.

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