A method and system for mapping multi-source background clastic rock sedimentary microfacies

Abstract

The application discloses a kind of multi-source background clastic rock sedimentary microfacies plan compilation method and system, method includes: the sedimentary facies background and source background of determining the mapping area;Acquire the clastic rock sample of mapping area, carry out source area-convergent zone comparative analysis with different source area sediment source background by test analysis result;Draw the sandstone thickness contour map, stratigraphic thickness contour map and ratio contour map of mapping area;Draw the sandstone thickness contour map and ratio contour map of each type of sedimentary microfacies;Based on the above analysis result, in combination with sandstone geophysical prediction result, the sedimentary microfacies plan is obtained by compiling the sedimentary microfacies plan of mapping area distribution characteristics, analysis.The application is quantitatively, qualitatively analyzed data, comprehensive multi-parameter, effectively determine the source direction of sand body, channel sand body distribution direction, and in combination with the geophysical prediction result of reservoir, effectively improve the accuracy of sedimentary microfacies plan drawing.

Description

Technical Field

[0001] This invention relates to the field of oil and gas exploration, and in particular to a method and system for compiling microfacies planar maps of clastic rocks with multiple provenance backgrounds. Background Technology

[0002] Clastic reservoirs are the most common reservoir type in oil and gas basins, showing increasing exploration potential. However, due to the complex formation mechanisms and difficulty in reconstructing the evolution of physical properties, oil and gas exploration in clastic reservoirs presents significant challenges. Sedimentary microfacies in clastic reservoirs refer to the smallest sedimentary units with unique lithological, structural, and tectonic characteristics formed in specific sedimentary environments. They play a crucial role in controlling the macroscopic distribution of reservoir sand bodies and the variability in reservoir quality. During oilfield development, sedimentary microfacies research is an important geological task because it can guide the establishment of complex structural models and reservoir models, analyze the distribution of remaining oil, and improve oilfield production.

[0003] Existing studies typically use sandstone thickness and sandstone thickness / stratum thickness methods to determine the distribution of sedimentary microfacies, combining these methods with geophysical predictions. However, this method has limitations. It cannot reflect the degree and extent of influence of each source on the sedimentary area, cannot determine which source influenced the sedimentary body, and cannot clearly define the main river distribution direction. Furthermore, the determination of river distribution and extension directions is also limited. Moreover, since most sedimentary microfacies can be developed in sandstone, the simple sandstone thickness / stratum thickness method results in low accuracy of sedimentary microfacies planar maps, thus affecting the precision and effectiveness of sedimentary microfacies planar distribution analysis. This leads to low accuracy of sedimentary microfacies planar distribution maps and cannot provide effective support for geophysical predictions. Studies have shown that multiple source backgrounds exist in the terrestrial clastic rock depositional processes of several basins in China, including the Sichuan Basin, Ordos Basin, and Tarim Basin. Sources from different directions play a decisive role in the sedimentary environment, and the sedimentary materials they provide also vary. It is evident that existing methods for mapping sedimentary microfacies planes of clastic reservoirs do not consider the influence of different sources of material on the sedimentary environment, nor do they distinguish the differences between each type of sedimentary microfacies sandstone, resulting in low accuracy of the sedimentary microfacies plane distribution map. Summary of the Invention

[0004] The purpose of this invention is to overcome the problem that existing methods for compiling sedimentary microfacies plans of clastic reservoirs do not consider the influence of different sources on the sedimentary environment, nor do they consider the differences in sandstone deposited by each sedimentary microfacies, resulting in low accuracy of the sedimentary microfacies planar distribution map. This invention provides a method and system for compiling clastic sedimentary microfacies planar distribution maps with multiple sources. Based on a multi-source background, this method utilizes multiple parameters from source to sink to improve the accuracy and effectiveness of the map, provide guidance for geophysical prediction, and enhance prediction reliability.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution: A method for compiling microfacies planar maps of clastic rocks with multiple provenances includes the following steps: Determine the sedimentary facies background of the mapping area; Clastic rock samples from different source areas were obtained, and the clastic rock samples were tested and analyzed. Combined with the sedimentary facies background of the mapped area, the sedimentary source background was obtained. Clastic rock samples were obtained from the mapping area, and the test and analysis results of the clastic rock samples were compared with the sedimentary provenance background of different provenance areas to conduct a provenance-convergence area comparison analysis. Collect data on sandstone thickness, stratigraphic thickness, and the ratio of sandstone thickness to stratigraphic thickness in the mapping area, and draw sandstone thickness contour maps, stratigraphic thickness contour maps, and ratio contour maps respectively. Based on the sedimentary facies background, sedimentary microfacies analysis was conducted on multiple single wells in the mapping area to obtain sandstone thickness and sandstone thickness / stratum thickness ratio data for each type of sedimentary microfacies. Sandstone thickness contour maps and ratio contour maps were then drawn for each type of sedimentary microfacies. Based on the comparative analysis results of the source area-convergence area, the sandstone thickness contour maps and stratigraphic thickness contour maps and ratio contour maps of the mapping area, and the sandstone thickness contour maps and ratio contour maps of each sedimentary microfacies, combined with the sandstone geophysical prediction results, the planar distribution characteristics of sedimentary microfacies in the mapping area were analyzed, and a sedimentary microfacies planar map was compiled.

[0006] In the technical solution of this invention, the sedimentary facies background of the mapping area is first determined. The sedimentary provenance background is obtained through testing and analysis of clastic rock samples, clarifying the differences in clastic material from different provenance areas. Clastic rock samples from the mapping area are obtained and tested to determine the differences in clastic material within the mapping area. The test and analysis results of the clastic rock samples from the mapping area are then compared with the sedimentary provenance backgrounds of different provenance areas to determine the influence range of different provenance directions on the mapping area and to determine the direction of clastic material origin within the mapping area. Thickness contour maps and ratio contour maps of the mapping area are then determined. Based on the contour maps, the distribution patterns and planar variation characteristics of sandstone areas in the mapping area are analyzed. Thickness contour maps and ratio contour maps of each type of sedimentary microfacies are then determined to analyze the distribution patterns and planar variation characteristics of each type of sedimentary microfacies. Finally, based on the above analysis results and combined with sandstone geophysical prediction results, the planar distribution characteristics of sedimentary microfacies are comprehensively analyzed to compile a sedimentary microfacies planar map.

[0007] Through the above technical solutions, this invention, targeting a multi-source background, clarifies the source direction and river channel distribution characteristics through source analysis. Combined with sedimentary characteristics, it analyzes sandstone thickness, stratigraphic thickness, and the sandstone thickness / stratigraphic thickness ratio in the mapping area. It also uses quantitative analysis methods, such as analyzing the thickness of sand bodies for each type of sedimentary microfacies and the sand body thickness / stratigraphic thickness ratio, to achieve a fine depiction of the distribution characteristics of sedimentary microfacies and improve the accuracy of sedimentary microfacies planar prediction. The method for compiling clastic sedimentary microfacies planar maps based on source-sink analysis provided by this invention obtains the sedimentary microfacies planar map of the mapping area by using quantitative analytical data and integrating multi-parameter methods. Since most sedimentary microfacies can deposit sandstone, this sandstone statistical method based on sedimentary microfacies can effectively avoid the misleading results of solely statistically analyzing sandstone thickness. Integrating multiple parameters can effectively determine the source direction of sand bodies, the distribution direction of channel sand bodies, and the distribution law of relatively dominant facies, thereby providing theoretical support for reservoir geophysical prediction and effectively improving prediction accuracy.

[0008] As a preferred embodiment of the present invention, the method for determining the sedimentary facies background of the mapping area is as follows: Obtain field profiles, well cores, drilling data, seismic data, and existing research data; analyze the data; determine the sedimentary background of the mapping area based on clastic sedimentary theory; and determine the sedimentary facies type of the mapping area. Data on the sedimentary background and sedimentary evolution process of the mapping area can be obtained by thoroughly investigating previous research results on the mapping area, analyzing the data, and determining the sedimentary facies type of the mapping area based on clastic sedimentary theory.

[0009] As a preferred embodiment of the present invention, the method for determining the sedimentary source background is as follows: based on the geological background of the mapping area, clastic rock samples from different source areas are tested and analyzed. The analysis methods include, but are not limited to, heavy mineral assemblage type and ZTR index analysis, quantitative analysis of detrital zircon U-Pb, analysis and graphical analysis of macro-element parameters, analysis and graphical analysis of trace element parameters, analysis and graphical analysis of rare earth element parameters, identification results of sandstone clastic components, Dickinson triangulation, etc. Based on the analysis results and the sedimentary facies background of the mapping area, the sedimentary source background is determined, and the differences in clastic materials in different source areas are clarified.

[0010] The ZTR index is the percentage content of zircon, tourmaline, and rutile in transparent heavy minerals. It is used to assess the maturity of sediments. A higher ZTR index indicates a higher maturity of the sediments and may also indicate that the sediments have undergone a long transport distance or a long transport process.

[0011] As a preferred embodiment of the present invention, the geological background of the mapping area is obtained by surveying relevant literature, and the geological background includes the tectonic background and the regional source region background.

[0012] As a preferred embodiment of the present invention, clastic rock samples of the mapping area are obtained by drilling wells in the mapping area, wherein the selected wells are representative and can be evenly distributed in the mapping area.

[0013] As a preferred embodiment of the present invention, when testing and analyzing clastic rock samples from the mapping area, a testing and analysis method that shows significant differences in the testing and analysis of clastic rock samples from the source area is selected.

[0014] As a preferred embodiment of the present invention, the data on sandstone thickness, formation thickness, and sandstone thickness / formation thickness ratio in the mapping area are obtained from drilling logging and well logging data. Corresponding sandstone thickness contour maps and formation thickness contour maps are drawn based on the sandstone thickness and formation thickness data, respectively, and ratio contour maps are drawn based on the sandstone thickness / formation thickness ratio data.

[0015] As a preferred embodiment of the present invention, the requirement for a single well within the mapping area is that multiple single wells can cover the mapping area on a plane. Based on the principle of clastic sedimentology, single-well sedimentary microfacies analysis is carried out to obtain sandstone thickness and sandstone thickness / formation thickness ratio data for each type of sedimentary microfacies. Then, line maps are drawn, and analysis is performed based on the thickness contour maps and ratio contour maps of each type of sedimentary microfacies.

[0016] Another aspect of the present invention provides a system for compiling microfacies plans of clastic rocks with multiple provenance backgrounds, the system comprising: The first determining module is used to determine the sedimentary facies background of the mapping area; The second determination module is used to obtain clastic rock samples from different source areas, test and analyze the clastic rock samples, and combine them with the sedimentary facies background of the mapped area to obtain the sedimentary source background. The comparative analysis module is used to obtain clastic rock samples from the mapping area and conduct a comparative analysis of the test and analysis results of the clastic rock samples with the sedimentary provenance background of different provenance areas. The first mapping module is used to collect data on sandstone thickness, stratigraphic thickness, and the ratio of sandstone thickness to stratigraphic thickness in the mapping area, and to draw sandstone thickness contour maps, stratigraphic thickness contour maps, and ratio contour maps respectively. The second mapping module is used to perform sedimentary microfacies analysis on multiple single wells in the mapping area based on the sedimentary facies background, obtain sandstone thickness and sandstone thickness / stratum thickness ratio data for each type of sedimentary microfacies, and draw sandstone thickness contour maps and ratio contour maps for each type of sedimentary microfacies respectively. The comprehensive analysis module is used to analyze the planar distribution characteristics of sedimentary microfacies in the mapping area based on the comparative analysis results of the source area-convergence area, the sandstone thickness contour map and stratigraphic thickness contour map and ratio contour map of the mapping area, the sandstone thickness contour map and ratio contour map of each type of sedimentary microfacies, and the sandstone geophysical prediction results, and to compile a planar map of sedimentary microfacies.

[0017] The present invention also provides an electronic device, including at least one processor and a memory communicatively connected to the at least one processor; the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform the above-described method for compiling a multi-source background clastic sedimentary microfacies planar map.

[0018] The present invention also provides a computer-readable storage medium storing at least one instruction, at least one program, code set, or instruction set, wherein the at least one instruction, the at least one program, the code set, or the instruction set is loaded and executed by a processor to implement the above-described method for compiling a multi-source background clastic sedimentary microfacies planar map.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention provides a method for compiling sedimentary microfacies planar maps. First, the sedimentary facies background of the mapping area is determined. The provenance background of sediments is obtained through testing and analysis of clastic rock samples, clarifying the differences in clastic material from different provenance areas. Clastic rock samples from the mapping area are acquired and tested to determine the differences in clastic material within the mapping area. The test and analysis results of the clastic rock samples in the mapping area are compared with the provenance backgrounds of different provenance areas to conduct a provenance-convergence zone comparison analysis, determining the influence range of provenance from different directions on the mapping area and identifying the direction of clastic material origin within the mapping area. Thickness contour maps and ratio contour maps of the mapping area are determined. Based on the contour maps, the distribution patterns and planar variation characteristics of sandstone regions in the mapping area are obtained. Thickness contour maps and ratio contour maps of each type of sedimentary microfacies are determined to analyze the distribution patterns and planar variation characteristics of each type of sedimentary microfacies. Finally, based on the above analysis results and combined with sandstone geophysical prediction results, the planar distribution characteristics of sedimentary microfacies are comprehensively analyzed to compile a sedimentary microfacies planar map. This invention, through quantitative and qualitative analysis of data and integration of multiple parameters, can effectively determine the source direction of sand bodies, the distribution direction of channel sand bodies, and the distribution law of relatively dominant facies. Combined with the geophysical prediction results of reservoirs, it can effectively improve the accuracy of the study of the planar distribution of sedimentary microfacies and enhance the accuracy of the characterization of the planar distribution of sedimentary microfacies.

[0020] 2. This invention is based on comparative analysis of source and convergence zones and clarifies the distribution range of sandstones with different source backgrounds, thereby better guiding geophysical prediction. Using this method, sedimentary microfacies studies can be carried out in greater detail. This not only helps to better locate favorable reservoirs and deploy exploration wells during the exploration process, thus obtaining better oil and gas exploration and development results, but also provides evidence for regional sedimentary backgrounds, a more effective understanding of sedimentary evolution processes, and regional tectonic evolution processes. It also provides support for predicting favorable reservoir distribution. Furthermore, this technology is not limited by region and has a wide range of applications, and can be used in multiple oil and gas basins in China. Attached Figure Description

[0021] Figure 1 A flowchart illustrating the method for compiling clastic sedimentary microfacies planar maps based on multiple parameters from source to sink in a multi-source context, as provided in this invention. Figure 2 This is a map showing the extent of the opposite bank in the middle section of the Sichuan West Depression in Example 1; Figure 3 This is a planar distribution diagram of the sedimentary facies of the Xu-2 Member in the Sichuan Basin in Example 1; Figure 4 Examples 1 show the sedimentary characteristics of the Xu-2 Member of the Sichuan West Depression in the Mianzhu area (a) and Pengzhou area (b) in the field profile. Figure 5The following are drilling sedimentary features of the Xu-2 Member in the Sichuan West Depression in Example 1: (a) 4451.4-4451.6m; (b) 4480.5-4480.7m. Figure 6 This is a columnar section of sedimentary facies from the X3 well in the middle section of the western Sichuan depression in Example 1. Figure 7 This is a planar distribution diagram of the sedimentary facies of the upper sub-member of the Xu'er Formation in the middle section of the Sichuan Basin in Example 1; Figure 8 This is a distribution map of zircon U-pb ages from the Xujiahe Formation in eastern Sichuan in Example 1; Figure 9 This is a distribution map of zircon U-pb ages from the Xujiahe Formation in northern Sichuan in Example 1; Figure 10 This is a distribution map of zircon U-pb ages from the Xujiahe Formation in southern Sichuan in Example 1; Figure 11 This is a distribution map of data points from the source-sink comparison analysis in Example 1; Figure 12 This is a contour map of the strata thickness of the No. 1 sandstone group in the upper sub-member of the Xu'er section of the central Sichuan section in Example 1. Figure 13 This is a contour map of the sandstone thickness of the No. 1 sandstone group in the upper sub-member of the Xuer section of the central Sichuan section in Example 1. Figure 14 This is a contour map of sandstone thickness / strata thickness in the first sandstone group of the upper sub-member of the second section of the central section of western Sichuan in Example 1. Figure 15 This is a contour map of the thickness of the estuary bar sedimentary microfacies sandstone in the upper sub-member of the second section of the western Sichuan Basin in Example 1. Figure 16 This is a contour map of sandstone thickness / strata thickness in the first sandstone group of the upper sub-member of the second section of the central section of western Sichuan in Example 1. Figure 17 Geophysical prediction results of the thickness of the No. 1 sandstone group in the upper sub-member of the Xu'er section in the northern part of the central section of western Sichuan. Figure 18 Geophysical prediction results of the thickness of sandstone in the upper sub-member of the second sandstone group in the northern part of the central section of western Sichuan; Figure 19 This is a planar distribution map of sedimentary microfacies in the upper sub-member 1 sandstone group of the northern part of the central section of western Sichuan. Detailed Implementation

[0022] To more clearly describe the inventive objectives, technical solutions, and advantages of the specific embodiments of this invention, the solutions in the specific embodiments will be described in detail below with reference to the accompanying drawings. The specific technical solutions involved in the following specific embodiments are merely for the purpose of clearly and completely describing the innovative technical solutions of this invention. They are only a part of the specific implementation methods that this invention can adopt, not all the embodiments, and should not be construed as limiting the innovative solutions of this invention. Any solution that adopts the same inventive concept as this invention should be included within the protection scope of this invention.

[0023] Secondly, the descriptions in the accompanying drawings of the specific embodiments of this invention are merely for the convenience of those skilled in the art to understand the invention. The details shown in the drawings are for the purpose of clearly presenting the technical solution, and should not be construed as including all technical features in the drawings in the specific implementation examples, nor should the details in the drawings be considered as additional limitations on the innovative technical solution of this invention. The components in the various embodiments described and shown in the drawings can be combined and arranged in different configurations. These variations in combination and arrangement should be considered as part of all embodiments of the innovative solution of this invention and included within the scope of protection of this invention.

[0024] In summary, the solutions or descriptions presented in the specific embodiments and accompanying drawings of this invention are not intended to limit the scope of protection claimed, but merely to illustrate selected embodiments / examples to help those skilled in the art understand the relevant innovative solutions. All other equivalent or parallel embodiments obtained by those skilled in the art based on these embodiments without inventive effort are within the scope of protection claimed by this invention.

[0025] Example 1 This embodiment provides a method for compiling a microfacies planar map of clastic rocks with multiple provenance backgrounds. This embodiment selects the Upper Sub-Member 1 of the Xujiahe Formation II in western Sichuan as the research target. Figure 1 To compile a planar map of clastic sedimentary microfacies, the mapping area covers the central section of the Sichuan Basin, such as... Figure 2 The steps include: Step S1: Determine the sedimentary facies background; During the investigation of the sedimentary background and evolution of the survey area, data such as field profiles, well cores, well data, seismic data, and previous research results were analyzed. Based on the theory of clastic sedimentology, the sedimentary background of the mapping area was determined, and the main sedimentary facies types of the mapping area were identified.

[0026] A detailed investigation of previous research findings confirmed that the Xu-2 Member in the Sichuan Basin represents a fluvial-deltaic sedimentary environment extending from multiple source areas in northern, eastern, and southern Sichuan into western Sichuan. Figure 3Previous studies included field profiles, well core samples, and single-well columnar section analysis. Field profile analysis in the Mianzhu area revealed parallel bedding and underwater distributary channel sedimentary characteristics, such as... Figure 4 (a); In the field profile of Pengzhou area, it is characterized by lenticular sandstone stacking and underwater distributary channel sandstone stacking, such as Figure 4 (b) Drill cores were taken from formation depths of 4451.4–4451.6 m and 4480.5–4480.7 m, respectively. At 4451.4–4451.6 m, the rock consisted of medium-grained feldspathic lithic sandstone with parallel bedding, strong hydrodynamic characteristics, and underwater distributary channel deposits, such as… Figure 5 (a); At 4480.5–4480.7 m, medium-grained feldspathic lithic sandstone, massive structure with strong hydrodynamic characteristics, underwater distributary channel deposition, such as Figure 5 (b). Single-well columnar section as follows Figure 6 As shown. Analysis of field profiles, well cores, and single-well columnar sections indicates that the sedimentary facies of the mapped area are delta front underwater distributary channel deposits. Based on the sand / soil ratio, a sedimentary plan of the central section of the Sichuan Basin was compiled, as shown below. Figure 7 .

[0027] Step S2: Obtain clastic rock samples from different source areas, test and analyze the clastic rock samples, and determine the sedimentary source background by combining the sedimentary facies background of the mapped area.

[0028] Based on the geological background of the mapped area, clastic rock samples from different source areas were tested and analyzed. The analytical methods included heavy mineral assemblage type and ZTR index analysis, quantitative analysis of detrital zircon U-Pb, analysis and graphical analysis of macro-element parameters, analysis and graphical analysis of trace element parameters, analysis and graphical analysis of rare earth element parameters, and Dickinson triangulation of sandstone detrital component characteristics. In this embodiment, the source background was determined by testing and analysis methods such as heavy mineral analysis, zircon dating analysis, trace element analysis, rare earth element analysis, and sandstone detrital component characteristic analysis of clastic rock samples from the basin margin and basin interior, clarifying the differences in clastic materials provided by each source area.

[0029] The heavy mineral analysis results of the clastic rock samples are shown in Table 1. According to the heavy mineral analysis, there are certain differences in the heavy mineral characteristics of the Xu-2 Member sandstone in the periphery of the Sichuan Basin. In southern Sichuan, the combination of zircon-magnetite-leucoxene is shown, in northern Sichuan, the combination of alkaline stone-tourmaline-leucoxene is shown, and in eastern Sichuan, the combination of alkaline stone-tourmaline-leucoxene is shown.

[0030] Zircon dating analysis results are as follows Figures 8-10The results indicate that the zircon ages of the Xujiahe Formation in the periphery of the Sichuan Basin are mainly concentrated in the age ranges of ~200 Ma, ~400 Ma, ~800 Ma, ~1800 Ma, ~2200 Ma, and ~2500 Ma. There are no significant differences between different regions. The ~800 Ma and ~2200 Ma ages are missing in eastern Sichuan, the ~2500 Ma age is missing in northern Sichuan, and the ~2200 Ma age is missing in southern Sichuan.

[0031] The results of trace element analysis are shown in Table 2. There are significant differences between eastern Sichuan and northern and southern Sichuan. Eastern Sichuan has relatively higher levels of V, Rb, and Ba, while southern Sichuan has relatively higher levels of Cr.

[0032] The results of rare earth element analysis are shown in Table 3. There is little difference between southern and eastern Sichuan, while there are some differences between northern Sichuan and eastern and southern Sichuan, with relatively lower rare earth element content.

[0033] The results of the sandstone clastic component analysis are shown in Table 4. The quartz and feldspar contents in the northern Sichuan region are significantly lower, while the rock fragment contents are significantly higher. In contrast, the sandstone in the eastern Sichuan region has higher quartz and feldspar contents. In terms of rock fragment types, the sedimentary rock fragments in the northern Sichuan region are more abundant, while the metamorphic and igneous rock fragments in the eastern Sichuan region are less abundant.

[0034] Table 1. Heavy mineral characteristics of the Xu-2 Formation in the periphery of the Sichuan Basin

[0035] Table 2. Trace element characteristics of the second segment of the Sichuan Basin periphery

[0036] Table 3. Rare Earth Element Characteristics of the Xu-2 Formation in the Periphery of the Sichuan Basin

[0037] Table 4. Clastic composition characteristics of the Xu-2 Formation sandstone in the periphery of the Sichuan Basin

[0038] Step S3: Obtain clastic rock samples from the mapping area, and conduct a comparative analysis of the test and analysis results of the clastic rock samples with the sedimentary provenance background of different provenance areas, and carry out a provenance-convergence area analysis.

[0039] Clastic rock samples were obtained by drilling in the mapping area. Wells that were representative and evenly distributed within the mapping area were selected. In this embodiment, 26 wells covering the mapping area were chosen, and their distribution is as follows: Figure 11As shown; simultaneously, the test and analysis methods with significant differences in clastic rock samples from the source area are selected to conduct source-sink comparative analysis, clarifying the direction of clastic material source in the mapped area. In the specific implementation process, 2-3 test and analysis data can be selected for source-sink comparative analysis based on drilling test and analysis data. Given the differences in test and analysis results of clastic rock samples from different source areas, this study uses heavy minerals, trace elements, and sandstone clastic components for source-sink comparative analysis. The test and analysis results of clastic rock samples are compared with the sedimentary source background of different source areas to further determine the influence range of different source directions on the mapped area. Based on these results, the distribution direction of different source channels is determined by combining geophysical predictions of sand body distribution trends. Relevant analyses are conducted for different wells, as follows: Heavy mineral analysis: The results are shown in Table 5. Based on the comparison of heavy mineral characteristics, the areas around wells X3, X6, X9, and X10 are more affected by the source material from southern Sichuan, the areas around wells X1, X11, X19, X21, and X24 are more affected by the source material from eastern Sichuan, and well X25 is affected by the source material from the north.

[0040] Trace element analysis: The results are shown in Table 6. The area around wells X4, X6, X8, and X10 is greatly affected by the source material from southern Sichuan, the area around wells X11, X15, X19, and X22 is greatly affected by the source material from eastern Sichuan, and well X25 is affected by the source material from the north.

[0041] Analysis of sandstone clastic composition characteristics: The results are shown in Table 7. The area around wells X1, X2, X4, X5, X8, X9, and X10 is affected by the southern source, the area around wells X11, X13, X14, X15, X18, X19, X20, X24, and X26 is affected by the eastern source, and well X25 is affected by the northern source.

[0042] Table 5. Heavy mineral characteristics of the upper sub-section of the second member of the central section of western Sichuan and its surrounding areas in the Sichuan Basin.

[0043] Table 6. Trace element characteristics of the upper sub-section of the second member of the central section of western Sichuan and its relationship with the surrounding areas of the Sichuan Basin.

[0044] Table 7. Content of clastic components in the upper sub-member of the second member of the central section of western Sichuan and its relationship with the surrounding sandstones of the Sichuan Basin.

[0045] Step S4: Collect data on sandstone thickness, stratum thickness, and sandstone thickness / stratum thickness ratio in the mapping area, and draw sandstone thickness contour maps, stratum thickness contour maps, and ratio contour maps respectively.

[0046] Based on the drilling logging and well logging data, the sandstone thickness, formation thickness, and sandstone thickness / formation thickness ratio data of the mapping area are statistically analyzed. Corresponding sandstone thickness contour maps and formation thickness contour maps are drawn based on the sandstone thickness and formation thickness data, respectively. A ratio contour map is drawn based on the sandstone thickness / formation thickness ratio data. Specific implementation methods are as follows: Stratigraphic thickness contour maps were compiled to understand the stratigraphic variation characteristics of the mapped area and guide sedimentary background research. Through the compilation of these contour maps, the overall stratigraphic thickness in the mapped area shows a trend of gradual increase from southwest to northeast. Figure 12 As shown.

[0047] Sand body thickness contour maps were compiled to understand the distribution characteristics of sand bodies in the mapped area. Based on the sand body thickness distribution characteristics, the sand bodies in this mapped area generally show a gradual thinning from southeast to northwest, which is consistent with the stratigraphic distribution characteristics. Figure 13 As shown.

[0048] The contour map of the sandstone thickness / strata thickness ratio also shows that the distribution trend of the sand bodies is consistent with that of the sand bodies. In the region mapped in this edition, the sandstone content gradually decreases from southeast to northwest, and the hydrodynamics of the sedimentary facies gradually weakens. Figure 14 .

[0049] Step S5: Based on the sedimentary facies background, perform sedimentary microfacies analysis on multiple single wells in the mapping area to obtain sandstone thickness and sandstone thickness / stratum thickness ratio data for each type of sedimentary microfacies, and draw sandstone thickness contour maps and ratio contour maps for each type of sedimentary microfacies.

[0050] The requirement for single wells within the mapping area is that they must cover the entire mapping area on a planar surface. Since the stratigraphic thickness remains constant in each region, sedimentary microfacies do not need to be statistically analyzed after obtaining the stratigraphic thickness contour maps of the mapping area. Based on the principles of clastic sedimentology, single-well sedimentary microfacies analysis is conducted to obtain sandstone thickness and sandstone thickness / stratigraphic thickness ratio data for each type of sedimentary microfacies. Then, line maps are plotted, and analysis is performed based on the thickness contour maps and ratio contour maps for each type of sedimentary microfacies. Firstly, based on sedimentary characteristics, the sedimentary environment of the Xuer Member sandstone in the mapping area is mainly divided into two types of sedimentary microfacies: underwater distributary channels and mouth bars. This study mainly statistically analyzes the sandstone thickness of the underwater distributary channel microfacies and mouth bar microfacies in each single well and compiles sandstone thickness contour maps to clarify their distribution patterns.

[0051] Based on sedimentological principles, multiple single wells covering the mapped area were selected on a planar surface. Single-well sedimentary microfacies analysis was conducted according to the principles of clastic sedimentology. Statistical analysis of different single wells revealed that the estuary bar microfacies distribution area is mainly located in the region of wells X1-X2-X19-X20-X16-X17-X18-X22-X24-X26, gradually thinning towards the south and east. Figure 15 The underwater distributary channel sedimentary microfacies are mainly distributed in the eastern and southern regions of the mapping area, such as... Figure 16 .

[0052] Step S6: Based on the comparative analysis results of the source area-convergence area, the sandstone thickness contour map and stratigraphic thickness contour map and ratio contour map of the mapping area, the sandstone thickness contour map and ratio contour map of each type of sedimentary microfacies, and combined with the sandstone geophysical prediction results, analyze the planar distribution characteristics of sedimentary microfacies in the mapping area, and compile a sedimentary microfacies planar map.

[0053] Based on the contour line distribution characteristics and source-sink correlation analysis, it can be seen that the central section of the Sichuan Basin is mainly influenced by sediment sources from the south, east, and north, with its depositional center located in the central and western parts of the mapped area. According to the analysis of sandstone thickness and the thickness of each type of sedimentary microfacies, three deltaic sedimentary bodies extending from the north, east, and south towards the depositional center exist in the central section of the Sichuan Basin.

[0054] Based on sandstone geophysical predictions in some areas of the work area, rock physical modeling and seismic data inversion methods were used. Some results are as follows: Figure 17 , Figure 18 Due to data limitations, it is currently impossible to conduct geophysical predictions for the entire mapping area. The geophysical prediction results will be compared with sand body thickness distribution characteristics, sand / land ratio distribution characteristics, and sedimentary microfacies sandstone thickness maps. Figures 12-16 ), combined with the sedimentary facies analysis of single wells drilled in the area ( Figure 6 As required, all well-drilled sedimentary facies analyses must be performed. Not all results are presented here. The final result is a multi-parameter source-sink clastic sedimentary microfacies planar map. Figure 19 ).

[0055] Compared to traditional sedimentary microfacies maps compiled based on a single sand / soil ratio ( Figure 7 The planar maps compiled using the method of this invention can not only more objectively reflect the influence characteristics of different water flow directions, but also better depict the planar distribution characteristics of each type of sedimentary microfacies, thus effectively improving the accuracy of map compilation.

[0056] Example 2 This embodiment provides a system for compiling microfacies planar maps of clastic rocks with multiple provenance backgrounds, used to implement the compilation method of Embodiment 1. The system includes: The first determining module is used to determine the sedimentary facies background of the mapping area; The second determination module is used to obtain clastic rock samples from different source areas, test and analyze the clastic rock samples, and combine them with the sedimentary facies background of the mapped area to obtain the sedimentary source background. The comparative analysis module is used to obtain clastic rock samples from the mapping area and conduct a comparative analysis of the test and analysis results of the clastic rock samples with the sedimentary provenance background of different provenance areas. The first mapping module is used to collect data on sandstone thickness, stratigraphic thickness, and the ratio of sandstone thickness to stratigraphic thickness in the mapping area, and to draw sandstone thickness contour maps, stratigraphic thickness contour maps, and ratio contour maps respectively. The second mapping module is used to perform sedimentary microfacies analysis on multiple single wells in the mapping area based on the sedimentary facies background, obtain sandstone thickness and sandstone thickness / stratum thickness ratio data for each type of sedimentary microfacies, and draw sandstone thickness contour maps and ratio contour maps for each type of sedimentary microfacies respectively. The comprehensive analysis module is used to analyze the planar distribution characteristics of sedimentary microfacies in the mapping area based on the comparative analysis results of the source area-convergence area, the sandstone thickness contour map and stratigraphic thickness contour map and ratio contour map of the mapping area, the sandstone thickness contour map and ratio contour map of each type of sedimentary microfacies, and the sandstone geophysical prediction results, and to compile a planar map of sedimentary microfacies.

[0057] The systems or modules described in the above embodiments can be implemented by computer chips or physical entities, or by products with certain functions. For ease of description, the above devices are described in terms of function, divided into various modules. Of course, in implementing this application, the functions of each module can be implemented in one or more software and / or hardware, or a module that performs the same function can be implemented by a combination of multiple sub-modules, etc.

[0058] This embodiment also provides an electronic device, including at least one processor, a memory communicatively connected to the at least one processor, and at least one input / output interface communicatively connected to the at least one processor; the memory stores instructions executable by the at least one processor, which, when executed by the at least one processor, enables the at least one processor to perform the method for compiling a multi-source background clastic sedimentary microfacies planar map according to Embodiment 1 above. The input / output interface may include a display, keyboard, mouse, and USB interface for inputting and outputting data.

[0059] The electronic device can be an electronic device for the client, such as a mobile phone, laptop, tablet, desktop computer, etc., to execute the method for compiling a multi-source background clastic sedimentary microfacies planar map of Embodiment 1.

[0060] Those skilled in the art will understand that all or part of the steps of the above method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it performs the steps of the above method embodiments. The aforementioned storage medium includes various media that can store program code, such as mobile storage devices, read-only memory (ROM), magnetic disks, or optical disks.

[0061] When the integrated units of this invention are implemented as software functional units and sold or used as independent products, they can also be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the embodiments of this invention, or the parts that contribute to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as mobile storage devices, ROMs, magnetic disks, or optical disks.

[0062] This embodiment also provides a computer-readable storage medium storing at least one instruction, at least one program, code set, or instruction set. The at least one instruction, the at least one program, the code set, or the instruction set is loaded and executed by a processor to implement the above-described method for compiling a multi-source background clastic sedimentary microfacies planar map.

[0063] A computer-readable storage medium can be a tangible device that holds and stores instructions for use by an instruction execution device. A computer-readable storage medium can be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any combination thereof.

[0064] For those skilled in the art, when understanding the solutions described in the specific embodiments of the present invention, conventional technical manuals in the field can be consulted. At the same time, appropriate understandings or adjustments can be made to the above-mentioned terms to deduce the same or similar technical solutions without creative effort.

[0065] The above embodiments describe only the basic principles, main features and / or advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and the description of the invention content in the specification are only the principles or specific cases of the present invention. Without departing from the essence of the innovative idea of ​​the present invention, there are various changes and improvements to the innovative solution of the present invention, and all such changes and improvements fall within the scope of protection claimed by the present invention.

Claims

1. A method for compiling a microfacies planar map of clastic rocks with multiple provenance backgrounds, characterized in that, Includes the following steps: Determine the sedimentary facies background of the mapping area; Clastic rock samples from different source areas were obtained, and the clastic rock samples were tested and analyzed. Combined with the sedimentary facies background of the mapped area, the sedimentary source background was obtained. Clastic rock samples were obtained from the mapping area, and the test and analysis results of the clastic rock samples were compared with the sedimentary provenance background of different provenance areas to conduct a provenance-convergence area comparison analysis. Collect data on sandstone thickness, stratigraphic thickness, and the ratio of sandstone thickness to stratigraphic thickness in the mapping area, and draw sandstone thickness contour maps, stratigraphic thickness contour maps, and ratio contour maps respectively. Based on the sedimentary facies background, sedimentary microfacies analysis was conducted on multiple single wells in the mapping area to obtain sandstone thickness and sandstone thickness / stratum thickness ratio data for each type of sedimentary microfacies. Sandstone thickness contour maps and ratio contour maps were then drawn for each type of sedimentary microfacies. Based on the comparative analysis results of the source area-convergence area, the sandstone thickness contour maps and stratigraphic thickness contour maps and ratio contour maps of the mapping area, and the sandstone thickness contour maps and ratio contour maps of each type of sedimentary microfacies, combined with the sandstone geophysical prediction results, the planar distribution characteristics of sedimentary microfacies in the mapping area were analyzed, and a sedimentary microfacies planar map was compiled.

2. The method for compiling a microfacies planar map of clastic rocks with multiple provenance backgrounds according to claim 1, characterized in that, The method for determining the sedimentary facies background of the mapping area is as follows: obtain field profiles, well cores, well data, seismic data, and existing research results; analyze the data; determine the sedimentary background of the mapping area based on clastic sedimentology theory; and determine the sedimentary facies type of the mapping area.

3. The method for compiling a microfacies planar map of clastic rocks with multiple provenance backgrounds according to claim 1, characterized in that, The method for determining the sedimentary provenance background is as follows: Based on the geological background of the mapping area, clastic rock samples from different provenance areas are tested and analyzed. The analytical methods include heavy mineral assemblage type and ZTR index analysis, quantitative analysis of detrital zircon U-Pb, analysis and graphical analysis of major element parameters, analysis and graphical analysis of trace element parameters, analysis and graphical analysis of rare earth element parameters, and Dickinson triangulation of sandstone clastic component characteristics. Based on the analysis results and the sedimentary facies background of the mapping area, the sedimentary provenance background is determined, and the differences in clastic materials in different provenance areas are clarified.

4. The method for compiling a microfacies planar map of clastic rocks with multiple provenance backgrounds according to claim 3, characterized in that, When testing and analyzing clastic rock samples from the mapping area, testing and analysis methods that show significant differences in the analysis of clastic rock samples from the source area were selected.

5. The method for compiling a microfacies planar map of clastic rocks with multiple provenance backgrounds according to claim 1, characterized in that, Clastic rock samples from the mapping area were obtained by drilling wells in the mapping area. The selected wells were representative and evenly distributed in the mapping area.

6. The method for compiling a microfacies planar map of clastic rocks with multiple provenance backgrounds according to claim 1, characterized in that, The data on sandstone thickness, formation thickness, and sandstone thickness / formation thickness ratio within the mapping area were obtained from drilling logging and well logging data. Corresponding sandstone thickness contour maps and formation thickness contour maps were drawn based on the sandstone thickness and formation thickness data, respectively, and a ratio contour map was drawn based on the sandstone thickness / formation thickness ratio data.

7. The method for compiling a microfacies planar map of clastic rocks with multiple provenance backgrounds according to claim 1, characterized in that, The requirement for a single well within the mapping area is that it must be a multi-well well that can cover the mapping area on a plane. Based on the principles of clastic sedimentology, a single-well sedimentary microfacies analysis is carried out to obtain the sandstone thickness and sandstone thickness / stratum thickness ratio data for each type of sedimentary microfacies. Then, line maps are drawn, and the analysis is based on the thickness contour maps and ratio contour maps for each type of sedimentary microfacies.

8. A system for compiling microfacies planar maps of clastic rocks with multiple provenances, characterized in that, The system includes: The first determining module is used to determine the sedimentary facies background of the mapping area; The second determination module is used to obtain clastic rock samples from different source areas, test and analyze the clastic rock samples, and combine them with the sedimentary facies background of the mapped area to obtain the sedimentary source background. The comparative analysis module is used to obtain clastic rock samples from the mapping area and conduct a comparative analysis of the test and analysis results of the clastic rock samples with the sedimentary provenance background of different provenance areas. The first mapping module is used to collect data on sandstone thickness, stratigraphic thickness, and the ratio of sandstone thickness to stratigraphic thickness in the mapping area, and to draw sandstone thickness contour maps, stratigraphic thickness contour maps, and ratio contour maps respectively. The second mapping module is used to perform sedimentary microfacies analysis on multiple single wells in the mapping area based on the sedimentary facies background, obtain sandstone thickness and sandstone thickness / stratum thickness ratio data for each type of sedimentary microfacies, and draw sandstone thickness contour maps and ratio contour maps for each type of sedimentary microfacies respectively. The comprehensive analysis module is used to analyze the planar distribution characteristics of sedimentary microfacies in the mapping area based on the comparative analysis results of the source area-convergence area, the sandstone thickness contour map and stratigraphic thickness contour map and ratio contour map of the mapping area, the sandstone thickness contour map and ratio contour map of each type of sedimentary microfacies, and the sandstone geophysical prediction results, and to compile a planar map of sedimentary microfacies.

9. An electronic device comprising at least one processor and a memory communicatively connected to said at least one processor; said memory storing instructions executable by said at least one processor, characterized in that, The instructions are executed by the at least one processor to enable the at least one processor to perform the method for compiling a multi-source background clastic sedimentary microfacies planar map as described in any one of claims 1-7.

10. A computer-readable storage medium storing at least one instruction, at least one program, a code set, or an instruction set, characterized in that, The at least one instruction, the at least one program segment, the code set, or the instruction set are loaded and executed by the processor to implement the method for compiling a multi-source background clastic sedimentary microfacies planar map as described in any one of claims 1-7.

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