A method, device, electronic device and storage medium for characterizing branch waterway configuration

Abstract

The present application provides a method, device, electronic device, and storage medium for characterizing branch channel configurations. The method comprises: compiling a core profile of a core well based on collected geological data, well logging curves, and production data from a relevant well area; obtaining a lithologic rhythm combination and well logging curve morphology based on the core profile; identifying level 3 to 5 configuration interfaces based on the lithologic rhythm combination and well logging curve morphology; characterizing level 3, level 4, and level 5 configurations using a hierarchical configuration control branch channel configuration body combination method; and obtaining internal interconnected bodies within the sand body based on level 3, level 4, and level 5 configuration interfaces to predict and quantitatively characterize the distribution of high permeability zones and internal interlayers within the sand body interconnected body level. This method lays a solid foundation for correctly understanding the laws of remaining oil enrichment and improving oil recovery. The method provided in this application has achieved excellent results in the evaluation of branch channel sandstones in the delta front of the BR oilfield.

Description

Technical Field

[0001] The present application belongs to the technical field of oil and gas field development, and specifically relates to a method, device, electronic device and storage medium for characterizing the configuration of delta front branch waterways. Background Art

[0002] The study of the finest vertical division of reservoirs and the corresponding sandbody architecture has always been a key focus of developmental geology research. The goal is to accurately restore the sedimentary structure of underground reservoirs, thereby enabling detailed characterization of interlayers, interconnected sandbody structures, and high-permeability zones within the sandbody. Because relatively thick sandbodies often develop high-permeability zones with high permeability and interlayers, these unique geological intervals may be relatively thin, sometimes comprising only 10-20% of the sandbody thickness. Their varying combinations with other conventional reservoir layers within the sandbody can form a complex reservoir structure with complex connectivity, thus varying the impact on oilfield recovery. During waterflooding, high-permeability zones are prone to water channeling, resulting in ineffective water injection and low recovery. Interlayer-developed areas can complicate the accumulation of remaining oil, making it difficult to enhance recovery. The vertical stratification accuracy for sedimentary microfacies such as composite channels is small, essentially the smallest unit of stratigraphic division in development geology based on well logging curve morphology. This stratigraphic unit accuracy is clearly too coarse for predicting and characterizing internal interlayers, high-permeability zones, and reservoir interconnected bodies. Therefore, for such reservoirs, if a sufficient number of core wells are available, efforts can be made to improve the accuracy of vertical stratigraphic division to further investigate the internal reservoir architecture. This requires not only detailed core observation data and microscopic core experimental data, but also, ideally, mature oil fields with a high well density. Secondly, the subdivision of interfaces at the well level introduces uncertainty in the connectivity of interwell subdivision interfaces, or in other words, uncertainty in the splicing of reservoir architecture. Effectively improving the accuracy of vertical reservoir division while controlling the adverse consequences of this increased uncertainty and achieving the most accurate quantitative characterization possible is a relatively difficult task. Judging from the current literature, although architectural research has accumulated a lot of results in the dissection of relatively thick sand bodies such as rivers, it is still basically in the exploratory stage. Most of them can be attributed to the characterization of small layer precision and corresponding sedimentary microfacies. Due to data limitations and large interface uncertainties, further characterization of single sand bodies and internal architecture is basically in a conceptual representation state and is not widely used in actual oil fields.

[0003] The patent application, "A Method for Quantitatively Characterizing Braided River Reservoir Architecture Units," provides a quantitative characterization method for braided river reservoir architecture units. By establishing a quantitative model for the relationship between single braided channel width and architecture units in modern braided rivers, a quantitative characterization method based on this single braided channel width is proposed. Compared with traditional methods for quantitative characterization of braided river reservoir architecture units, the key parameter, single braided channel width, is easier to obtain and more reliable, enabling more accurate quantitative characterization of braided river reservoir architecture units and prediction of braided river spatial distribution. This method focuses on the combination of channels and bars on a five-level braided channel plane and does not address the internal architecture of a channel or bar.

[0004] The patent application for "A Method for Identifying Submarine Fan Channel Reservoir Configuration" relates to a method for identifying submarine fan channel reservoir configuration, comprising the following steps: 1) identifying configuration unit characteristics through precise calibration of well and seismic horizons; 2) determining the three-dimensional configuration distribution model corresponding to each configuration unit based on the configuration unit characteristics; and 3) combining the three-dimensional configuration distribution models corresponding to each configuration unit to obtain a submarine fan channel reservoir configuration model. This method fully and rationally incorporates the configuration heterogeneity of submarine fan channel reservoirs, facilitates understanding of reservoir internal connectivity, and provides important technical support for the efficient development of submarine fan channel-type oil and gas reservoirs. This configuration identification method targets the identification of channel sedimentary microfacies, equivalent to solving the sand body combination problem at the level of the fifth-level configuration.

[0005] The patent application for "A method for characterizing the configuration of a single sand body in a clastic reservoir" relates to a method for characterizing the configuration of a single sand body in a clastic reservoir, comprising the following steps: establishing a vertical configuration model of a single sand body corresponding to core characteristics; establishing a vertical configuration model of a single sand body corresponding to the response characteristics of a logging curve; then, through rock-electrical relationship feature matching, using attribute clustering analysis to establish a vertical configuration model of a single sand body corresponding to the core characteristics and the response characteristics of the logging curve, and using this model to interpret the configuration model of a single sand body in the vertical direction of an uncored single well; further determining the lateral configuration model of a single sand body; and combining reservoir configuration theory to complete the quantitative characterization of the single sand body configuration. The present invention establishes a model between the interior of the sand body and between wells, focusing on constructing the configuration of coreless wells through logging curves. The disadvantage is that it is too conceptual and difficult to operate.

[0006] The paper "Characterization of the Reservoir Architecture of the Lobe-shaped Shallow Delta in the Southern Bohai Sea" takes the 1167 sand body in the BZ28 oilfield in the southern Bohai Sea as an example. Under the guidance of the modern sedimentary evolution model of shallow delta, it comprehensively applies high-resolution seismic attribute logging, horizontal well geological guidance and production dynamics data to divide the sand body architecture units step by step according to the internal sedimentary lobes of the composite channel diversion sand bar. The paper still mainly focuses on the combination of the sedimentary microfacies of the diversion channel and the estuary sand bar. It does not provide a clear division and combination method for the internal architecture of the sand body, and does not involve interlayers and sand body connections.

[0007] The paper "Quantitative Characterization of Overlapping Relationships in Deepwater Turbidite Channel Reservoir Architecture" explored the quantitative characterization of the Z reservoir in the AKPO oilfield in the Niger Basin to precisely characterize the overlapping relationships between individual channel sandbodies within deepwater turbidite composite channel sandbodies. The study found that the different overlapping relationships between individual channel sandbodies in deepwater turbidite channel reservoirs can be quantitatively characterized using the "overlapping ratio" parameter, which can be further divided into vertical and lateral overlapping ratios. The overlapping ratio between individual channel sandbodies is correlated with the sinuosity of the composite channel sandbodies within which they reside, and channel sinuosity is highly correlated with geological factors such as basin slope and provenance. The overlapping ratio between individual channel sandbodies is also correlated with the connectivity within the composite sandbodies, and a "connectivity coefficient" can be fitted to assess internal reservoir connectivity. This paper focuses on the overlapping relationship between composite channels and individual channels, and the role of overlapping ratio in the connectivity of composite sandbodies. It does not address the characterization of individual channels within a composite channel or the characterization of internally connected bodies.

[0008] The paper "Detailed Characterization of Braided River Reservoir Architecture in the Guantao Formation, Nanpu 2-1 Block, Bohai Bay Basin" states that the spatial distribution of braided river reservoir sandstone structure and seepage barriers is a key geological factor affecting the effectiveness of waterflooding in the Nanpu 2-1 block. Using a combination of core, well logging, and 3D seismic data, a detailed reservoir characterization was conducted based on the spatial distribution of four-level structural units in the braided river reservoir. Based on a dense well pattern analysis, we identified four-level structural units of three genetic types: bar, braided channel, and overflow bank. Three vertical stacking patterns (bar-bar stacking, braided channel-bar stacking, and overflow bank-bar stacking) and three lateral stacking patterns (bar downstream progradational overlay, braided channel separated bar, and bar-distributary braided channel) were established for these units. Using root mean square amplitude and frequency-divided RGB fusion stratigraphic slicing techniques, we predicted the planar distribution of the four-level structural units in the NgⅡ-6 layer of the Nanpu 2-1 area. The geometry and size of the bar reservoir units, as well as their contact with the braided channels that act as seepage barriers, were revealed. This provides a direct geological basis for optimizing waterflooding development plans and improving oilfield development effectiveness. The architecture described in this paper also corresponds to the microfacies level. The internal structure of the sand bodies is primarily conceptual, and no specific division or characterization methods are mentioned.

[0009] In summary, the study of the vertical subdivision interface and corresponding configuration in thick sand bodies is a direction of fine reservoir research. At present, due to the limitation of the number of coring wells, the characterization effect of the internal structure of the sand body is not significant, and generally only the accuracy of reflecting the configuration of the composite water channel sedimentary microfacies can be achieved. Further in-depth research and better technical advancement are needed for the characterization of smaller-scale configurations.

[0010] The BR layer of the BR oilfield in Canada is a marine deltaic sedimentary reservoir, which mainly develops delta front branch channels, estuary bar and far sand bar sand bodies with a thickness of about 10-30 meters. High permeability strips and calcareous interlayers are developed inside the sand bodies. The structure is relatively complex. The oilfield wells are relatively shallow, about 1,500 meters deep. During the development process, the foreign party found that the reservoir porosity and permeability are effective in guiding production, and the coring cost is not high. Therefore, a large amount of coring was carried out. Almost 80% of the reservoir sections of the development wells have coring. In addition, it has been developed for nearly 40 years, with a high well network density and a well spacing of about 200 meters. From the data perspective, it is very suitable for a detailed reservoir configuration study. This paper refers to the MAIL architectural classification standard and conducts a detailed dissection and characterization of a branch channel development area in the region. A 5-level architecture is used to correspond to composite channel sedimentary microfacies, a 4-level architecture to a single channel, and a 3-level architecture to sedimentary bodies of identical lithology at different locations within a single channel. Based on the architectural body, the prediction of the interconnected bodies between interlayers and sand bodies is constrained, achieving a detailed characterization of the reservoir, thus laying a good foundation for predicting the distribution of remaining oil in the reservoir and improving the recovery rate and economic benefits of oil and gas fields. Summary of the Invention

[0011] In view of this, the present application provides a method, device, electronic device and storage medium for characterizing the configuration of a branch waterway, so as to solve the problem in the prior art that due to the limitation of the number of core wells, the characterization effect of the internal structure of the sand body is not significant, and generally it can only reflect the accuracy of the configuration of the composite waterway sedimentary microfacies, and the characterization effect for smaller-level configurations is not obvious.

[0012] In a first aspect, an embodiment of the present application provides a method for characterizing a branched waterway configuration, comprising:

[0013] Based on the collected geological data, well logging curves and production data of the relevant well areas, the core profile of the inner well in the area with thick sand bodies in the branch channel is compiled;

[0014] According to the core section of the core well, the lithologic rhythm combination and the logging curve shape are obtained;

[0015] According to the obtained lithologic rhythm combination and logging curve morphology, a third-level structural interface, a fourth-level structural interface, and a fifth-level structural interface are identified;

[0016] According to the sedimentary pattern of branch channel outcrops in the surrounding area, the hierarchical configuration-controlled branch channel configuration body combination method was used to characterize the branch channel level 3 configuration body corresponding to the level 3 configuration interface, the branch channel level 4 configuration body corresponding to the level 4 configuration interface, and the branch channel level 5 configuration body corresponding to the level 5 configuration interface.

[0017] Based on the third-level structural interface, the fourth-level configuration interface and the fifth-level configuration interface, the internal connected body of the sand body is obtained, and the distribution prediction and quantitative characterization of the internal interlayers at the high permeability zone and the sand body connected body level are realized.

[0018] In a possible implementation, identifying the third-level structural interface, the fourth-level configuration interface, and the fifth-level configuration interface based on the obtained lithologic rhythm combination and the well logging curve morphology includes:

[0019] The five-level configuration interface is identified by the composite lithologic rhythm of the core section and the typical changes of the well logging curve, representing the beginning or end of a composite sedimentary process;

[0020] The fourth-level structural interface is identified by the rhythmic morphological changes of a single sand body in the core section of the core well, representing a smaller-scale sedimentary process;

[0021] The third-level configuration interface is identified by the lithologic changes of the core well, and corresponds to an obvious lithologic interface of a certain thickness within a rhythmic segment.

[0022] In one possible implementation, based on the outcrop sedimentary pattern of the branch channel in the surrounding area, a hierarchical configuration-controlled branch channel configuration body combination method is used to perform combined characterization on the branch channel level 3 configuration body corresponding to the level 3 configuration interface, the branch channel level 4 configuration body corresponding to the level 4 configuration interface, and the branch channel level 5 configuration body corresponding to the level 5 configuration interface, respectively, including:

[0023] The combination of the five-level structural bodies of the branch channel, which correspond to the composite channel sedimentary microfacies and have little lateral variation, is used to compile a sand body thickness map based on the outcrop sedimentary pattern of the branch channel between core wells, thereby predicting the morphology and boundaries of the composite channel.

[0024] The combination of the four-level structural bodies of branch channels, which correspond to single channels and are a rhythmic segment of positive cycles, is first restricted by the boundaries of the five-level composite channels. Secondly, under the control of the water flow direction, based on the dense well network and guided by the sedimentary structural pattern of the branch channel outcrops in the surrounding area, the well-connected profile in the direction of water flow is determined. Then, guided by the sedimentary structural pattern of the branch channel outcrops in the surrounding area, the distribution of single channels on the core well is combined. The thickness of the sandstone of the five-level composite channel is used to constrain the superposition of multiple single channels in the longitudinal direction to determine the boundaries of each single channel. Again, the single channel combination is carried out on the profile perpendicular to the water flow direction and the profile closure is verified. Finally, the profile in any direction is verified and the thickness map of the sand body of each single channel is compiled.

[0025] The combination of the three-level structural bodies of the branch waterway, within the single river channel of the four-level structural body, the fine particles at the top of the coarse-grained sediment level at the bottom of the waterway inside the single river channel of the four-level structural body are combined according to the binary sedimentation law of the single river channel to determine the thickness and boundary of the bottom riverbed or top embankment sediment corresponding to the three-level structural body.

[0026] In one possible implementation, the method is based on the third-level structural interface, the fourth-level configuration interface, and the fifth-level configuration interface to obtain the internal interconnected body of the sand body, and realize the distribution prediction and quantitative characterization of the high permeability zone and the internal interlayer of the sand body interconnected body level, including:

[0027] The internal interlayer characterization refers to the characterization of interlayer distribution within the three-level configuration body. Specifically, different interlayers are first identified and then combined accordingly between wells. Based on the well point data and using the boundary constraints of the three-level configuration body, multiple interlayer plane thickness maps are obtained.

[0028] The characterization of the internal connected bodies of the sand body is carried out by determining the number and distribution of the internal connected bodies of the sand body based on the distribution of the larger interlayers and the interface of the structural body. The thickness of the internal interlayers and the thickness of the three-level structural body are combined to obtain the plane thickness map of different connected bodies. The liquid production profile and water absorption profile are used for verification and corresponding adjustment.

[0029] The high permeability zone is characterized as a connected body developed inside the coarse-grained sandstone at the bottom of the river channel sediments. The high permeability zone identified by the well points forms a plane thickness map and boundary of the high permeability zone under the constraint of the third-level structural body.

[0030] In a second aspect, an embodiment of the present application provides a branch waterway configuration characterization device, comprising:

[0031] The core well core profile acquisition device is used to compile the core well core profile of the branch channel thick sand body development area based on the collected geological data, well logging curves and production data of the relevant well area;

[0032] Rhythm and logging curve acquisition device, used to obtain lithologic rhythm combination and logging curve morphology based on core well rock profile;

[0033] A branch channel configuration interface identification device is used to identify the third-level configuration interface, the fourth-level configuration interface and the fifth-level configuration interface based on the obtained lithologic rhythm combination and the logging curve morphology;

[0034] The device for combining various structural bodies at different levels is used to combine and characterize the third-level structural body of the branch channel corresponding to the third-level structural interface, the fourth-level structural body of the branch channel corresponding to the fourth-level structural interface, and the fifth-level structural body of the branch channel corresponding to the fifth-level structural interface, based on the sedimentary pattern of the branch channel outcrops in the surrounding area.

[0035] The sand body connectivity characterization device is used to obtain the internal connected bodies of the sand body based on the 3rd level structural interface, 4th level configuration interface and 5th level configuration interface, and realize the distribution prediction and quantitative characterization of the high permeability zone and the internal interlayer of the sand body connected body level.

[0036] In a third aspect, an embodiment of the present application provides an electronic device, including:

[0037] processor;

[0038] Memory;

[0039] and a computer program, wherein the computer program is stored in the memory, and the computer program includes instructions, which, when executed by the processor, enable the electronic device to perform any one of the methods described in the first aspect.

[0040] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium includes a stored program, wherein the device where the computer-readable storage medium is located in the time and space where the program is running executes any one of the methods described in the first aspect.

[0041] In the examples of this application, a method for characterizing the configuration of branch channel sand bodies in dense well patterns in mature oil fields with abundant core data is provided. This method can accurately reflect the internal sedimentary structure of the sand body and, based on this detailed configuration, effectively predict the distribution of high-permeability zones, interconnected sand bodies, and interlayers within the sand body, providing technical support for the distribution of remaining oil and improving oil field recovery. This inventive method has achieved excellent results in the evaluation of branch channel sandstones in the delta front of the BR oil field. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0043] Figure 1 A flow chart of a method for characterizing a branched waterway configuration provided in an embodiment of the present application;

[0044] Figure 2 A flowchart of a specific implementation of a branched waterway configuration characterization method provided in an embodiment of the present application;

[0045] Figure 3 An example diagram of a preferred branch waterway development area provided in an embodiment of the present application;

[0046] Figure 4 A single well core profile description diagram provided in an embodiment of the present application;

[0047] Figure 5 This is a diagram of the interface division of the branch waterway configuration provided in an embodiment of the present application;

[0048] Figure 6 A cross-sectional view of the internal wells of a five-level configuration provided in an embodiment of the present application;

[0049] Figure 7 A plane distribution diagram of a 4-level configuration provided in an embodiment of the present application;

[0050] Figure 8 A distribution diagram of interlayers and high permeability zones on a well provided in an embodiment of the present application;

[0051] Figure 9 A cross-sectional distribution diagram of a connected body provided in an embodiment of the present application;

[0052] Figure 10 A structural diagram of a branch waterway configuration characterization device provided in an embodiment of the present application;

[0053] Figure 11A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0054] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0055] It should be clear that the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0056] The terms used in the embodiments of the present application are for the purpose of describing specific embodiments only and are not intended to limit the present application. The singular forms "a", "an", "the" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise.

[0057] It should be understood that the term "and / or" as used herein simply describes a relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A alone, A and B together, or B alone. Furthermore, the character " / " in this document generally indicates an "or" relationship between the associated objects.

[0058] The study of the vertical subdivision interface and corresponding configuration in thick sand bodies is a direction of fine reservoir research. At present, due to the limitation of the number of coring wells, the characterization effect of the internal structure of the sand body is not significant, and generally only the accuracy of reflecting the configuration of the composite water channel sedimentary microfacies can be achieved. Further in-depth research and better technical advancement are needed for the characterization of smaller-level configurations.

[0059] In response to the above problems, the present application provides a method, device, electronic equipment and storage medium for characterizing the configuration of a branch waterway, so as to solve the problem in the prior art that due to the limitation of the number of core wells, the characterization effect of the internal structure of the sand body is not significant, and generally only the accuracy of reflecting the configuration of the composite waterway sedimentary microfacies can be achieved, and the characterization effect for smaller-level configurations is not obvious.

[0060] To further clarify the technical content and advantages of the present invention, the present invention is further described below with reference to the accompanying drawings and an example of a branch channel development zone in Block B of the BR Oilfield in Canada. It should be noted that, unless otherwise defined, the relevant terms used in this invention are technical terms that are understood by persons of ordinary skill in the art to which the present invention belongs, and are described in detail below with reference to the accompanying drawings.

[0061] See also Figure 1, a flow chart of a branch waterway configuration characterization method provided in an embodiment of the present application. Figure 1 As shown, it mainly includes the following steps.

[0062] S101: Based on the collected geological data, well logging curves and production data of the relevant well areas, compile the core profile of the inner well in the area where the thick sand body of the branch waterway is developed.

[0063] In the embodiment of the present application, a typical injection-production well area with relatively thick sand bodies and developed branch waterways is first selected in a targeted manner, and geological data in the well area are collected. The collected geological data mainly include core data, logging data and injection-production well production data; all core wells within the production well are observed and described in detail, and a core well core profile description diagram is compiled, focusing on describing the core well lithology and sedimentary structure.

[0064] In a specific embodiment, a configuration dissection is performed on a fast branch channel development area in the B area of ​​the BR oil field in Canada. A B sand body with a relatively thick sand body in the B area is selected for dissection. The thickness is 10-30 meters. This is a typical injection and production well area with branch channel development. Figure 3 As shown in Figure 1, priority is given to the development of branch channels; geological data, well logging data, and production data of 70 injection and production wells and 53 core wells were collected in Area B. This area is rich in core wells, accounting for nearly 81%. Detailed core observations were conducted on the reservoir sections of all core wells in this area, and single well core profile descriptions were compiled, as shown in Figure 1. Figure 4 As shown, the focus is on describing the changes in lithologic grain size and bedding structure as the basis for the study of architectural bodies.

[0065] S102: Obtaining lithologic rhythm combinations and well logging curve morphology based on the core well core profile description diagram;

[0066] S103: Identifying a level 3 structural interface, a level 4 structural interface, and a level 5 structural interface based on the obtained lithologic rhythm combination and the well logging curve morphology;

[0067] like Figure 2 As shown, it is a specific implementation flow chart of a branch waterway configuration characterization method provided in an embodiment of the present application.

[0068] In the embodiment of the present application, the stratigraphic cycle comparison method is adopted, and the lithologic composite rhythm and logging curve are used as the main data to divide the 5-level configuration interface, that is, the 5-level configuration interface is identified by the composite lithologic rhythm and typical changes of the logging curve of the core section of the core well, representing the beginning or end of a composite sedimentary process; within the 5-level configuration interface, the lithologic profile data of the core observation is used to divide the 4-level configuration interface according to a relatively complete positive cycle rhythm of the lithology, specifically, the 4-level configuration interface is identified by the rhythmic morphological changes of a single sand body in the core section of the core well, representing a smaller-scale sedimentary process; within the 4-level configuration interface, the 3-level configuration interface is divided according to different lithologic change surfaces of a certain thickness, that is, the lithologic changes of the core well core are identified at the 3-level configuration interface, corresponding to an obvious lithologic boundary interface of a certain thickness within a rhythmic segment; the division of the branch waterway configuration interface is as follows Figure 5 shown.

[0069] S104: Based on the sedimentary pattern of the branch channel outcrops in the surrounding area, the hierarchical configuration-controlled branch channel configuration body combination method is used to combine and characterize the branch channel level 3 configuration body corresponding to the level 3 configuration interface, the branch channel level 4 configuration body corresponding to the level 4 configuration interface, and the branch channel level 5 configuration body corresponding to the level 5 configuration interface;

[0070] In one possible implementation, Figure 2 As shown in the figure, the combination of the 5-level structural bodies of the branch channel corresponds to the composite channel sedimentary microfacies. The 5-level structural body has little lateral variation. The sand body thickness map is compiled through the sedimentary pattern of the branch channel outcrops between core wells, and then the morphology and boundary of the composite channel are predicted. The 5-level structural body of the branch channel determines the boundary, water flow direction, and sand body thickness distribution of the branch channel based on the dense section network, as shown in the figure. Figure 6 The cross-section of the internal wells of the 5-level configuration shown in the figure shows that inside the 5-level branch waterway and along the river direction, thickness constraints are used to combine the 4-level single channels to determine the plane distribution of the single channel and the superposition style of different channels.

[0071] The combination of the 4-level structural bodies of branch channels, the 4-level structural body corresponds to a single channel, which is a rhythmic segment of a positive cycle. For the combination of single channels of the 4-level structural body, the boundary of the 5-level composite channel is first used as a restriction; secondly, under the control of water flow direction, based on the dense well network and guided by the sedimentary structural pattern of the branch channel outcrops in the surrounding area, the well-jointed profile along the water flow direction is determined. Then, guided by the sedimentary structural pattern of the branch channel outcrops in the surrounding area, the distribution of single channels on the core well is combined. The thickness of the sandstone of the 5-level composite channel is used to constrain the superposition of multiple single channels in the longitudinal direction to determine the boundary of each single channel; again, the single channel is combined on the profile perpendicular to the water flow direction and the profile closure is verified; finally, the profile in any direction is verified, and the sand body thickness map of each single channel is compiled. The scale data of the 4-level single channel are shown in Table 1. Figure 7This is a planar distribution diagram of the 4-level configuration body of the embodiment of this application.

[0072] Table 1 Scale of single waterway in this area

[0073] category Length (m) Width (m) Thickness (m) River 1 7000 1600 15 River 2 5000 1200 10 River 3 4000 900 7

[0074] The combination of the three-level structural bodies of the branch waterway, within the single river channel of the four-level structural body, the fine particles at the top of the coarse-grained sediment level at the bottom of the waterway inside the single river channel of the four-level structural body are combined according to the binary sedimentation law of the single river channel to determine the thickness and boundary of the bottom riverbed or top embankment sediment corresponding to the three-level structural body.

[0075] S105: Based on the third-level structural interface, the fourth-level configuration interface and the fifth-level configuration interface, the internal interconnected body of the sand body is obtained to realize the distribution prediction and quantitative characterization of the high permeability zone and the internal interlayer of the sand body interconnected body level.

[0076] In one possible implementation, internal interlayer characterization refers to the characterization of interlayer distribution within the three-level structural body. Specifically, different interlayers are first identified and then combined accordingly between wells. Based on the well point data, the boundary constraints of the three-level structural body are used to obtain multiple interlayer plane thickness maps; the internal connected body characterization of the sand body determines the number and distribution of connected bodies within the sand body based on the distribution of larger interlayers and the structural body interface, and combines the thickness of the internal interlayer with the thickness of the three-level structural body to obtain plane thickness maps of different connected bodies, which are verified and adjusted accordingly using the liquid production profile and water absorption profile; the high permeability zone characterization is a connected body developed inside the coarse-grained sandstone at the bottom of the river channel sediment. The high permeability zone identified by the well point forms a plane thickness map and boundary of the high permeability zone under the constraints of the three-level structural body.

[0077] In a specific embodiment, the sand body structure of the branch channel is complex. Influenced by lithology and cement, calcareous interlayers and high permeability zones are developed inside. The high permeability zones are mainly developed in the coarse-grained sediments at the bottom of the third-order structural body channel. The permeability of some layers is as high as 1000MD. The calcareous interlayers, i.e., internal interlayers, are mainly present in the fine-grained sediments at the top of the third-order structural body channel. The permeability is usually less than 1MD. Figure 8 As shown in the figure, the distribution map of internal interlayers and high permeability zones on the well is used to predict the interwell distribution of special layers under the constraints of the three-level configuration body, and the internal interlayer thickness map and high permeability zone thickness map are compiled.

[0078] According to the distribution of internal interlayers and interfaces of various structural bodies, the distribution and number of sand body interconnections are determined, such as Figure 9 The cross-sectional distribution diagram of the connected body shown in the figure can be used to obtain the thickness map and boundary of the connected body based on the thickness distribution of different configuration bodies and the thickness distribution of internal interlayers. Finally, the injection and production profile is used for verification and adjustment.

[0079] Corresponding to the above embodiments, the present application also provides a branch waterway configuration characterization device.

[0080] See also Figure 10 , which is a structural block diagram of a branch waterway configuration characterization device provided in this application. Figure 10 As shown, it mainly includes the following modules.

[0081] The core well core profile obtaining device 1001 is used to compile the core well core profile of the branch channel thick sand body development area based on the collected geological data, well logging curves and production data of the relevant well area;

[0082] Rhythm and logging curve obtaining device 1002, used to obtain lithologic rhythm combination and logging curve morphology based on core well rock profile;

[0083] The branch channel configuration interface identification device 1003 is used to identify the third-level configuration interface, the fourth-level configuration interface and the fifth-level configuration interface based on the obtained lithologic rhythm combination and the well logging curve morphology;

[0084] The device for combining the various configuration bodies 1004 is used to combine and characterize the third-level configuration body of the branch channel corresponding to the third-level configuration interface, the fourth-level configuration body of the branch channel corresponding to the fourth-level configuration interface, and the fifth-level configuration body of the branch channel corresponding to the fifth-level configuration interface, based on the sedimentary pattern of the branch channel outcrops in the surrounding area.

[0085] The sand body connectivity characterization device 1005 is used to obtain the internal connected body of the sand body based on the 3rd level structural interface, 4th level configuration interface and 5th level configuration interface, and realize the distribution prediction and quantitative characterization of the high permeability zone and the internal interlayer of the sand body connected body level.

[0086] It should be pointed out that the specific contents involved in the embodiments of the present application can be found in the description of the above method embodiments. For the sake of brevity, they will not be repeated here.

[0087] Corresponding to the above embodiment, an embodiment of the present application further provides an electronic device.

[0088] See also Figure 11 , is a structural diagram of an electronic device provided in an embodiment of the present application. Figure 11 As shown, the electronic device 1100 may include: a processor 1101, a memory 1102, and a communication unit 1103. These components communicate via one or more buses. Those skilled in the art will appreciate that the electronic device structure shown in the figure does not limit the embodiments of the present application. It may be a bus structure or a star structure, and may include more or fewer components than shown, or combine certain components, or arrange the components differently.

[0089] The communication unit 1103 is used to establish a communication channel so that the electronic device can communicate with other devices.

[0090] The processor 1101 is the control center of the electronic device. It uses various interfaces and lines to connect the various parts of the entire electronic device. It runs or executes software programs and / or modules stored in the memory 1102, and calls the data stored in the memory to perform various functions of the electronic device and / or process data. The processor can be composed of an integrated circuit (IC), for example, it can be composed of a single packaged IC, or it can be composed of multiple packaged ICs with the same or different functions. For example, the processor 1101 can include only a central processing unit (CPU). In the embodiment of the present application, the CPU can be a single computing core or multiple computing cores.

[0091] The memory 1102 is used to store the execution instructions of the processor 1101. The memory 1102 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk.

[0092] When the execution instructions in the memory 1102 are executed by the processor 1101 , the electronic device 1100 is enabled to execute part or all of the steps in the above method embodiments.

[0093] Corresponding to the above embodiment, an embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium may store a program, wherein, when the program is executed, the device containing the computer-readable storage medium may be controlled to perform some or all of the steps in the above method embodiment. In a specific implementation, the computer-readable storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

[0094] Corresponding to the above embodiment, an embodiment of the present application further provides a computer program product, which includes executable instructions. When the executable instructions are executed on a computer, the computer executes some or all of the steps in the above method embodiment.

[0095] In the embodiments of the present application, "at least one" refers to one or more, and "more" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. Among them, A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c can be represented by: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple.

[0096] Those skilled in the art will appreciate that the various units and algorithm steps described in the embodiments disclosed herein can be implemented using a combination of electronic hardware, computer software, and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0097] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0098] In the several embodiments provided in this application, if any function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application is essentially or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of this application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, and other media that can store program code.

[0099] The above description is merely a specific embodiment of the present application. Any person skilled in the art may easily conceive of variations or substitutions within the technical scope disclosed in this application, and such variations or substitutions shall be within the scope of protection of this application. The scope of protection of this application shall be subject to the scope of protection of the claims.

Claims

1. A method for characterizing branch channel configuration, characterized in that: include: Based on the collected geological data, well logging curves and production data of the relevant well areas, the core profiles of the core wells in the thick sand body development area of ​​the branch waterway are compiled; According to the core profile of the core well, the lithologic rhythm combination and the logging curve shape are obtained; According to the obtained lithologic rhythm combination and logging curve morphology, a level 3 configuration interface, a level 4 configuration interface, and a level 5 configuration interface are identified; According to the sedimentary pattern of branch channel outcrops in the surrounding area, the hierarchical architecture-controlled branch channel architecture body combination method was used to characterize the branch channel level 3 architecture body corresponding to the level 3 architecture interface, the branch channel level 4 architecture body corresponding to the level 4 architecture interface, and the branch channel level 5 architecture body corresponding to the level 5 architecture interface, respectively. The results include: A combination of five-level structural bodies of branch channels, corresponding to composite channel sedimentary microfacies, with minimal lateral variation, was used to compile sand body thickness maps between core wells using the branch channel outcrop sedimentary patterns, thereby predicting the morphology and boundaries of the composite channel. The combination of the four-level structural bodies of branch channels, which correspond to single channels and are a rhythmic segment of positive cycles, is first restricted by the boundaries of the five-level composite channels. Secondly, under the control of water flow direction, based on a dense well network and guided by the sedimentary structural pattern of branch channel outcrops in the surrounding area, the well-jointed profile in the direction of water flow is determined. Then, guided by the sedimentary structural pattern of branch channel outcrops in the surrounding area, the distribution of single channels on the core wells is combined. The thickness of the sandstone of the five-level composite channel is used to constrain the superposition of multiple single channels in the vertical direction to determine the boundaries of each single channel. Again, the single channel combination is carried out on the profile perpendicular to the water flow direction and the profile closure is verified. Finally, the profile in any direction is verified, and the thickness map of the sand body of each single channel is compiled. The combination of the three-level structure of the branch channel, within the single channel of the four-level structure, the fine grains at the top of the coarse-grained sediment level at the bottom of the channel within the single channel of the four-level structure are combined according to the binary sedimentary law of the single channel to determine the thickness and boundary of the bottom riverbed or top bank sediment corresponding to the three-level structure; Based on the 3rd-level, 4th-level and 5th-level configuration interfaces, the internal connected bodies of the sand body are obtained, and the distribution prediction and quantitative characterization of the high permeability zone, sand body connected bodies and internal interlayers are realized.

2. The method according to claim 1, characterized in that The method of identifying the level 3 configuration interface, the level 4 configuration interface and the level 5 configuration interface based on the obtained lithologic rhythm combination and the logging curve morphology includes: The five-level configuration interface is identified by the composite lithologic rhythm of the core section of the core well and the typical changes in the well logging curve, representing the beginning or end of a composite sedimentary process; The fourth-level structural interface is identified by the rhythmic morphological changes of a single sand body in the core well core section, representing a smaller-scale sedimentary process; The third-level configuration interface is identified by the lithologic changes of the core of the core well, and corresponds to an obvious lithologic interface of a certain thickness within a rhythmic segment.

3. The method according to claim 1, characterized in that The method is based on the third-level configuration interface, the fourth-level configuration interface and the fifth-level configuration interface to obtain the internal interconnected body of the sand body, realize the distribution prediction and quantitative characterization of the high permeability zone, the interconnected body of the sand body and the internal interlayer, including: Internal interlayer characterization refers to the characterization of interlayer distribution within the three-level configuration body. Specifically, different interlayers are first identified and then combined accordingly between wells. Based on the well point data, the three-level configuration body boundary constraints are used to obtain multiple interlayer plane thickness maps. Characterization of interconnected bodies within the sand body: Specifically, the number and distribution of interconnected bodies within the sand body are determined based on the distribution of larger interlayers and the interface of the structural body. Combining the thickness of the internal interlayers with the thickness of the third-level structural body, a planar thickness map of different interconnected bodies is obtained. The liquid production profile and water absorption profile are used for verification and corresponding adjustments; Characterization of the high permeability zone: The high permeability zone is a connected body developed inside the coarse-grained sandstone at the bottom of the river channel sediments. The high permeability zone identified by the well points forms a plane thickness map and boundary of the high permeability zone under the constraint of the third-level structural body.

4. A branch waterway configuration characterization device, characterized in that: include: The core well core profile acquisition device is used to compile the core well core profile in the branch channel thick sand body development area based on the collected geological data, well logging curves and production data of the relevant well area; Rhythm and logging curve acquisition device, used to obtain lithologic rhythm combination and logging curve morphology based on core well core profile; A branch channel configuration interface identification device is used to identify the 3rd level configuration interface, the 4th level configuration interface and the 5th level configuration interface based on the obtained lithologic rhythm combination and the logging curve morphology; The device for combining various configuration bodies is used to combine and characterize the third-level configuration body of the branch channel corresponding to the third-level configuration interface, the fourth-level configuration body of the branch channel corresponding to the fourth-level configuration interface, and the fifth-level configuration body of the branch channel corresponding to the fifth-level configuration interface, based on the sedimentary pattern of the branch channel outcrops in the surrounding area. The device includes: A combination of five-level structural bodies of branch channels, corresponding to composite channel sedimentary microfacies, with minimal lateral variation, was used to compile sand body thickness maps between core wells using the branch channel outcrop sedimentary patterns, thereby predicting the morphology and boundaries of the composite channel. The combination of the four-level structural bodies of branch channels, which correspond to single channels and are a rhythmic segment of positive cycles, is first restricted by the boundaries of the five-level composite channels. Secondly, under the control of water flow direction, based on a dense well network and guided by the sedimentary structural pattern of branch channel outcrops in the surrounding area, the well-jointed profile in the direction of water flow is determined. Then, guided by the sedimentary structural pattern of branch channel outcrops in the surrounding area, the distribution of single channels on the core wells is combined. The thickness of the sandstone of the five-level composite channel is used to constrain the superposition of multiple single channels in the vertical direction to determine the boundaries of each single channel. Again, the single channel combination is carried out on the profile perpendicular to the water flow direction and the profile closure is verified. Finally, the profile in any direction is verified, and the thickness map of the sand body of each single channel is compiled. The combination of the three-level structure of the branch channel, within the single channel of the four-level structure, the fine grains at the top of the coarse-grained sediment level at the bottom of the channel within the single channel of the four-level structure are combined according to the binary sedimentary law of the single channel to determine the thickness and boundary of the bottom riverbed or top bank sediment corresponding to the three-level structure; The sand body connectivity characterization device is used to obtain the internal connected bodies of the sand body based on the 3rd-level configuration interface, 4th-level configuration interface and 5th-level configuration interface, and realize the distribution prediction and quantitative characterization of the high permeability zone, sand body connected bodies and internal interlayers.

5. An electronic device, characterized in that: include: processor; Memory; and a computer program, wherein the computer program is stored in the memory, and the computer program includes instructions, which, when executed by the processor, enable the electronic device to perform the method according to any one of claims 1 to 3.

6. A computer-readable storage medium, characterized in that The computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute the method according to any one of claims 1 to 3.

Images