Branch water channel configuration characterization method and device, electronic equipment and storage medium

Abstract

The embodiment of the invention provides a branch water channel configuration characterization method and device, electronic equipment and a storage medium, and the method comprises the steps: compiling a core section map of a core well according to the collected geological data, logging curve and production data of a related well area; obtaining a lithologic rhythm combination and a logging curve form according to the core section map of the core well; according to the lithologic rhythm combination and the logging curve form, identifying a 3-5-level configuration interface; respectively representing a three-level configuration body, a four-level configuration body and a five-level configuration body by using a hierarchical configuration control branch water channel configuration body combination method; on the basis of a three-level configuration interface, a four-level configuration interface and a five-level configuration interface, a sand body internal communicating body is obtained, and distribution prediction and quantitative characterization of a high-permeability zone and a sand body communicating body level internal interlayer are achieved. And a solid foundation is laid for correctly knowing the enrichment rule of the remaining oil and improving the recovery ratio. The method provided by the invention achieves a good effect in evaluation of the sandstone in the branched water channel at 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 equipment and storage medium for characterizing the configuration of a delta front branch waterway. Background Art

[0002] The study of the vertical division of the reservoir as finely as possible and the corresponding sand body configuration has always been a key direction of development geological research, with the aim of accurately restoring the sedimentary structure of the underground reservoir, so as to be able to finely characterize the interlayers in the sand body, the connected bodies of the sand body, the high permeability zones, etc. Since some high permeability bands with high permeability and some interlayers are often developed in a relatively thick sand body, the thickness of these special geological sections may not be large, and some only account for 10-20% of the thickness of the sand body. Their different combinations with other conventional reservoirs in the sand body will form a reservoir structure with a very complex connection relationship, thus forming different effects on the oil field recovery rate. In the process of water injection development, water channeling is easy to form in the high permeability zone, resulting in ineffective water injection and low recovery rate. The interlayer development area may complicate the enrichment of the remaining oil, bringing difficulties to improving the recovery rate. The vertical geological stratification accuracy corresponding to sedimentary microfacies such as composite waterways is small layers, which is basically the smallest unit for dividing strata according to the shape of logging curves in development geology. Such stratigraphic unit accuracy is obviously too coarse for the prediction and characterization of interlayers, high permeability bands and reservoir interconnected bodies. Therefore, for such oil reservoirs, if there are enough core wells, we can try to improve the vertical division accuracy of the strata and conduct in-depth research on the internal configuration of the reservoir. On the one hand, it is required that there should be detailed observation data of the core and microscopic experimental data of the core on the well, and it is better to be an old oil field with a large enough well network density. This is the requirement in terms of data. The second aspect is that the subdivision interface on the well will bring uncertainty in the connection of the subdivision interface between wells, or the uncertainty of the splicing of the reservoir configuration body. How to effectively improve the vertical division accuracy of the reservoir while controlling the adverse consequences caused by the corresponding increase in uncertainty and achieving as accurate quantitative characterization as possible are relatively difficult topics. Judging from the current literature, although a lot of results have been accumulated in the dissection of relatively thick sand bodies such as rivers, the configuration research is still basically in the exploratory stage. Most of them can be attributed to the characterization of small layer accuracy and corresponding sedimentary microfacies. Due to data limitations and large interface uncertainties, the further characterization of single sand bodies and internal configurations is basically in a state of conceptual representation and is not widely used in actual oil fields.

[0003] The patent application "A quantitative characterization method for braided river reservoir configuration units" provides a quantitative characterization method for braided river reservoir configuration units. By establishing a quantitative model of the relationship between the width of a single braided channel and the configuration unit of a modern braided river, a quantitative characterization method for the configuration unit based on the width of the single braided channel is proposed. Compared with the traditional quantitative characterization method for braided river reservoir configuration units, its key parameter, the width of a single braided channel, is easier to obtain and more reliable, thereby more accurately achieving the quantitative characterization of braided river reservoir configuration units and predicting the spatial distribution of braided rivers. This method focuses on solving the combination problem of a channel and a shoal on a plane of a 5-level braided waterway, and does not involve the internal configuration anatomy of a channel or a shoal.

[0004] The patent application "A method for identifying the configuration of submarine fan channel reservoirs" involves a method for identifying the configuration of submarine fan channel reservoirs, including the following steps: 1) identifying the characteristics of the configuration unit through fine calibration of well seismic layers; 2) determining the three-dimensional configuration distribution model corresponding to each configuration unit according to the characteristics of the configuration unit; 3) combining the three-dimensional configuration distribution model corresponding to each configuration unit to obtain the submarine fan channel reservoir configuration model. This method fully and reasonably incorporates the configuration heterogeneity pattern of the submarine fan channel reservoir, which is conducive to understanding the internal connectivity of the reservoir and providing important technical support for the efficient development of submarine fan channel oil and gas reservoirs. This configuration identification method is aimed at the identification of channel sedimentary microfacies, which is equivalent to solving the sand body combination problem at the level of level 5 configuration.

[0005] The patent application "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, which includes 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-electricity relationship feature matching, using attribute clustering analysis methods 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 a single well without coring; further defining the configuration model of a single sand body in the lateral direction; combining reservoir configuration theory to complete the quantitative characterization of the single sand body configuration. The present invention establishes a model between the inside of the sand body and the wells, focusing on realizing the construction of the configuration of a coreless well through logging curves. The disadvantage is that it is too conceptual and difficult to operate.

[0006] The document "Characterization of the Reservoir Architecture of the Lobe-shaped Shallow Delta in the Southern Bohai Sea" takes the 1167 sand body of the BZ28 oilfield in the southern Bohai Sea as an example. Under the guidance of the modern sedimentary evolution model of shallow deltas, it comprehensively applies high-resolution seismic attribute logging phase 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 diversion sand bar. The document still mainly focuses on the combination of the level architecture of the diversion channel and the estuary sand bar sedimentary microfacies. 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 interconnections.

[0007] The document "Exploration of quantitative characterization of superposition relationship of deepwater turbidite channel reservoir architecture" explored the quantitative characterization of Z reservoir of AKPO oilfield in Niger Basin in order to finely characterize the superposition relationship between single channel sand bodies inside deepwater turbidite composite channel sand bodies. The study found that the different superposition relationships between single channel sand bodies in deepwater turbidite channel reservoirs can be quantitatively characterized by the "superposition ratio" parameter, which can be further subdivided into vertical superposition ratio and lateral superposition ratio; the superposition ratio between single channel sand bodies has a certain correlation with the curvature of the composite channel sand body where they are located, and the curvature of the channel is highly correlated with geological factors such as the slope of the basin and the supply of material sources; the superposition ratio between single channel sand bodies is correlated with the connectivity inside the composite sand body, and the "connectivity coefficient" can be fitted as a reference for judging the internal connectivity of the reservoir. This paper focuses on the analysis of the superposition relationship between composite channels and single channels, and the reference of superposition ratio to the connectivity of composite sand bodies, and does not involve the characterization of single channels in composite channels or the characterization of internal connected bodies.

[0008] Reference "Detailed Characterization of Braided River Reservoir Architecture of Guantao Formation in Nanpu 2-1 Area, Bohai Bay Basin" The spatial distribution of the sand body structure and seepage barrier of the braided river reservoir is a key geological factor affecting the water injection development effect of Nanpu 2-1 Block. The core, well logging and 3D seismic data were comprehensively applied to carry out detailed reservoir characterization based on the spatial distribution of the fourth-level structural units of the braided river reservoir. Based on the analysis of the dense well network, the four-level structural units of the three genetic types of the center bar, braided channel and overflow bank of the NgⅡ-6 layer in Nanpu 2-1 area were identified. Three vertical superposition styles (center bar-center bar superposition, braided channel-center bar superposition and overflow bank-center bar superposition) and three lateral superposition styles (center bar downstream foreset superposition type, braided channel separated center bar type and center bar-distributary braided channel type) of the four-level structural units were established. The plane distribution of the four-level structural units of the NgⅡ-6 layer in Nanpu 2-1 area was predicted by using the root mean square amplitude and frequency division RGB fusion stratigraphic slice technology, revealing the geometric shape and size of the center bar reservoir unit and its contact relationship with the braided channel as a seepage barrier, which provides a direct geological basis for optimizing the water injection development plan of the oilfield and improving the development effect of the oilfield. The configuration in this article also corresponds to the microfacies level. The structure inside the sand body is basically conceptual, and no specific division and 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 waterway sedimentary microfacies can be achieved. For the characterization of smaller-level configurations, further in-depth research and better technical advancement are needed.

[0010] The BR layer of the Canadian BR oilfield is a marine delta sedimentary reservoir, which mainly develops delta front branch channels, estuary dams and far sandbars, with a thickness of about 10-30 meters. High-permeability strips and calcareous interlayers are developed inside the sand bodies, and 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 were good for guiding production, and the coring cost was 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 large well network density and a well spacing of about 200 meters. From the data point of view, it is very suitable for a detailed reservoir configuration study. With reference to the MAIL configuration classification standard, this paper dissects and characterizes a branch channel development area in the region in detail. A 5-level configuration is used to correspond to the composite channel sedimentary microfacies, a 4-level configuration corresponds to a single channel, and a 3-level configuration corresponds to sedimentary bodies with the same lithology in different parts of a single channel. The configuration body is used as the basis to constrain the prediction of the interconnected body between the interlayer and the sand body, thereby achieving a fine characterization of the reservoir, thereby 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 coring wells, the characterization effect on 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 on 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, logging curves and production data of the relevant well areas, the core profile of the inner well in the thick sand body development area of ​​the branch waterway is compiled;

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

[0015] According to the obtained lithological rhythm combination and logging curve morphology, the third-level structural interface, the fourth-level structural interface and the 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 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.

[0017] Based on the 3rd-level structural interface, 4th-level configuration interface and 5th-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 sand body connected body level are realized.

[0018] In a possible implementation, the step of identifying the level 3 structural interface, the level 4 configuration interface and the level 5 configuration interface based on the obtained lithological rhythm combination and the logging curve morphology includes:

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

[0020] The 4th 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 sedimentation process;

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

[0022] In a possible implementation, according to the outcrop sedimentation pattern of the branch channel in the surrounding area, the hierarchical configuration is used to control the branch channel configuration body combination method, and 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 are combined and characterized, including:

[0023] The combination of the 5-level structural bodies of the branch channel, the 5-level structural body corresponds to the composite channel sedimentary microfacies, the 5-level structural body has small lateral changes, and the sand body thickness map is compiled through the branch channel outcrop sedimentary model between the core wells, thereby predicting the morphology and boundary of the composite channel;

[0024] The combination of the 4-level structural bodies of the branch channel, the 4-level structural body corresponds to a single channel, which is a rhythmic segment of a positive cycle. For the combination of the single channel of the 4-level structural body, the boundary of the 5-level composite channel is firstly used as a restriction; 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-joining profile along the water flow direction is determined, and then guided by the sedimentary structural pattern of the branch channel outcrops in the surrounding area, the distribution of the single channel on the core well is combined, and 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 boundaries of each single channel; again, the single channel is combined for 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;

[0025] The combination of the 3rd-level structural bodies of the branch waterway, within the single channel of the 4th-level structural body, combines the fine particles at the top of the coarse-grained sedimentary level at the bottom of the waterway inside the single channel of the 4th-level structural body according to the binary sedimentary law of the single channel, and determines the thickness and boundary of the bottom riverbed or top embankment deposits corresponding to the 3rd-level structural body.

[0026] In a 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 characterizing the interlayer distribution in the three-level configuration body, specifically, first identifying different interlayers, and then combining the different interlayers accordingly between wells, based on the well point data, using the boundary constraints of the three-level configuration body, and obtaining multiple interlayer plane thickness maps;

[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 according to the distribution of the larger interlayer and the interface of the structure body, and combining the thickness of the internal interlayer with the thickness of the third-level structure body to obtain the plane thickness diagram of different connected bodies, and using the liquid production profile and water absorption profile 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 deposits. 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 configuration 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 in the branch channel thick sand body development area based on the collected geological data, logging curves and production data of the relevant well area;

[0032] Rhythm and logging curve acquisition device, used to obtain lithology rhythm combination and logging curve form according to the core well rock profile;

[0033] 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 according to the obtained lithological rhythm combination and the logging curve morphology;

[0034] A device for combining structures of various levels is used to combine and characterize the third-level structure body of the branch channel corresponding to the third-level structure interface, the fourth-level structure body of the branch channel corresponding to the fourth-level structure interface, and the fifth-level structure body of the branch channel corresponding to the fifth-level structure interface according to the sedimentary pattern of the branch channel outcrops in the surrounding area by using the method of combining structure bodies of branch channel according to the hierarchical structure;

[0035] The sand body connectivity characterization device is used to obtain the internal connectivity of the sand body based on the 3rd-level structural interface, the 4th-level configuration interface and the 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 connectivity 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, and when the instructions are executed by the processor, the electronic device executes 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 executed executes any one of the methods described in the first aspect.

[0041] In the embodiment of the present application, the present application provides a configuration characterization method of a branch channel sand body in an old oil field with rich core data under dense well network conditions, which can accurately reflect the internal sedimentary structure of the sand body, and can effectively predict the distribution of high permeability strips, sand body interconnections and interlayers in the sand body based on the fine configuration, providing technical support for the distribution of remaining oil and improving the recovery rate of oil fields. This invention method has achieved good results in the evaluation of branch channel sandstone at 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 drawings required for use in the embodiments will be briefly introduced below. 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 paying creative labor.

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

[0044] Figure 2 A specific implementation flow chart of a branch water channel 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 for an embodiment of the present application;

[0047] Figure 5 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 5-level configuration body provided in an embodiment of the present application;

[0049] Figure 7 A plane distribution diagram of a 4-level configuration body 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] Fig. 9 A cross-sectional distribution diagram of a connected body provided in an embodiment of the present application;

[0052] Fig.10 A structural diagram of a branch water channel configuration characterization device provided in an embodiment of the present application;

[0053] Fig.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 described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0056] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" 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 other meanings.

[0057] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0058] The study of the vertical subdivision interface and corresponding configuration in thick sand bodies is one direction of detailed reservoir research. Currently, 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 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 device and storage medium for characterizing the configuration of a branch waterway, so as to help solve the problem that in the prior art, due to the limitation of the number of coring wells, the characterization effect on 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 on smaller-level configurations is not obvious.

[0060] In order to make the technical content and technical advantages of the present invention clearer, the present invention is further described below in conjunction with the accompanying drawings and examples of the branch channel development area of ​​Block B of the BR Oilfield in Canada. It should be pointed out that unless otherwise defined, the relevant terms used in the present invention should be technical terms that can be understood by technicians with general skills in the technical field to which the present invention belongs, and are described in detail below in conjunction with the accompanying drawings.

[0061] See also Figure 1, a flow chart of a method for characterizing branch channel configuration 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, logging curves and production data of the relevant well areas, compile the core profile of the inner well in the thick sand body development area of ​​the branch waterway.

[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 fast branch channel development area in the B area of ​​the BR oil field in Canada is selected for a configuration dissection. A B sand body with a thicker 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 waterways; geological data, well logging data, and production data of 70 injection and production wells and 53 core wells were collected in Area B. There are abundant core wells in this area, accounting for nearly 81%. Detailed core observations were conducted on all the core well reservoir sections 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 lithology and grain size and bedding structure as the basis for the study of architectural bodies.

[0065] S102: Obtaining lithology rhythm combination and logging curve shape according to the core well core profile description diagram;

[0066] S103: identifying a level 3 structural interface, a level 4 configuration interface, and a level 5 configuration interface according to the obtained lithological rhythm combination and the 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 of the core section of the core well and the typical changes of the logging curve, representing the beginning or end of a composite sedimentary process; within the 5-level configuration interface, the lithologic profile data observed by the core is used to divide the 4-level configuration interface according to a relatively complete positive cyclic rhythm of 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 3-level configuration interface is identified by the lithologic changes of the core well, corresponding to an obvious lithologic interface of a certain thickness in a rhythmic segment; the division of the branch waterway configuration interface is as follows Figure 5 shown.

[0069] S104: According to the sedimentary pattern of the branch channel outcrops in the surrounding area, the branch channel structure body combination method of hierarchical structure control is used to combine and characterize the branch channel level 3 structure body corresponding to the level 3 structure interface, the branch channel level 4 structure body corresponding to the level 4 structure interface and the branch channel level 5 structure body corresponding to the level 5 structure 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 small lateral changes. The sand body thickness map is compiled through the outcrop sedimentary mode of the branch channel between the 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 diagram of the internal wells of the 5-level configuration body 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 styles of different channels.

[0071] The combination of the 4-level structural bodies of the branch channel, the 4-level structural body corresponds to a single channel, which is a rhythmic segment of a positive cycle. For the combination of the single channel of the 4-level structural body, the boundary of the 5-level composite channel is firstly used as a restriction; 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-joining profile along the water flow direction is determined, and then guided by the sedimentary structural pattern of the branch channel outcrops in the surrounding area, the distribution of the single channel on the core well is combined, and 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 boundaries of each single channel; again, the single channel is combined for 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 plan distribution diagram of the 4-level configuration body of the embodiment of the present 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 3rd-level structural bodies of the branch waterway, within the single channel of the 4th-level structural body, combines the fine particles at the top of the coarse-grained sedimentary level at the bottom of the waterway inside the single channel of the 4th-level structural body according to the binary sedimentary law of the single channel, and determines the thickness and boundary of the bottom riverbed or top embankment deposits corresponding to the 3rd-level structural body.

[0075] S105: Based on the 3rd-level structural interface, 4th-level configuration interface and 5th-level configuration interface, the internal interconnected body of the sand body is obtained to achieve the distribution prediction and quantitative characterization of the internal interlayers at the high permeability zone and the sand body interconnected body level.

[0076] In one possible implementation, internal interlayer characterization refers to characterizing the distribution of interlayers within the three-level configuration body, specifically, first identifying different interlayers and combining them accordingly between wells, and obtaining multiple interlayer plane thickness maps based on well point data and the boundary constraints of the three-level configuration body; characterizing the internal connected bodies of the sand body, determining the number and distribution of connected bodies within the sand body according to the distribution of larger interlayers and the interface of the configuration body, and obtaining plane thickness maps of different connected bodies by combining the thickness of the internal interlayers with the thickness of the three-level configuration body, and verifying and adjusting them accordingly using the production profile and the water absorption profile; characterizing the high permeability zone, the high permeability zone belongs to a connected body, developed inside the coarse-grained sandstone at the bottom of the river channel deposits, and the high permeability zone identified by the well points forms a plane thickness map and boundary of the high permeability zone under the constraints of the three-level configuration body.

[0077] In a specific embodiment, the sand body structure of the branch channel is complex. Affected by the 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, and 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, and 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 inter-well distribution of special layers under the constraints of the three-level configuration body, and to compile the internal interlayer thickness map and high permeability zone thickness map.

[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 Fig. 9 The connected body profile distribution diagram shown in the figure can be used to obtain the connected body thickness diagram and boundary based on the thickness distribution of different configuration bodies and the thickness distribution of internal interlayers, and finally the injection and production profile is used for verification and adjustment.

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

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

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

[0082] Rhythm and logging curve acquisition device 1002, used to obtain lithology rhythm combination and logging curve form according to the core well rock profile;

[0083] The branch channel configuration interface identification device 1003 is used to identify the 3rd level configuration interface, the 4th level configuration interface and the 5th level configuration interface according to the obtained lithological rhythm combination and the logging curve shape;

[0084] The various levels of configuration body combination device 1004 is used to combine and characterize the level 3 configuration body of the branch channel corresponding to the level 3 configuration interface, the level 4 configuration body of the branch channel corresponding to the level 4 configuration interface, and the level 5 configuration body of the branch channel corresponding to the level 5 configuration interface according to the depositional pattern of the branch channel outcrops in the surrounding area using the hierarchical configuration control branch channel configuration body combination method;

[0085] The sand body connectivity characterization device 1005 is used to obtain the internal connectivity of the sand body based on the 3rd level structural interface, the 4th level configuration interface and the 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 connectivity 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, and 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 Fig.11 , is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. Fig.11 As shown, the electronic device 1100 may include: a processor 1101, a memory 1102 and a communication unit 1103. These components communicate through one or more buses. Those skilled in the art can understand that the electronic device structure shown in the figure does not constitute a limitation on the embodiments of the present application. It can be a bus structure or a star structure, and can also include more or fewer components than shown in the figure, or combine certain components, or arrange 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 various parts of the entire electronic device. It runs or executes software programs and / or modules stored in the memory 1102, and calls 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] Memory 1102 is used to store execution instructions of processor 1101. Memory 1102 can be implemented by any type of volatile or non-volatile storage device or a combination of them, 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, the 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 running, the device where the computer-readable storage medium is located 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 disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM).

[0094] Corresponding to the above-mentioned embodiment, the 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-mentioned method embodiment.

[0095] In the embodiments of the present application, "at least one" refers to one or more, and "plurality" 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 subsequent 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 of ordinary skill in the art will appreciate that the various units and algorithm steps described in the embodiments disclosed herein can be implemented in 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. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0097] Those skilled in the art can 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 several embodiments provided in the present application, any function can be stored in a computer-readable storage medium if it is implemented in the form of a software functional unit and sold or used as an independent product. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, etc., and other media that can store program codes.

[0099] The above is only a specific implementation of the present application. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. The protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for characterizing branch channel configuration, characterized in that: include: Based on the collected geological data, logging curves and production data of the relevant well areas, the core profile of the inner well in the thick sand body development area of ​​the branch waterway is compiled; According to the core section of the core well, the lithology rhythm combination and the shape of the logging curve are obtained; According to the obtained lithological rhythm combination and logging curve morphology, the third-level structural interface, the fourth-level structural interface and the fifth-level structural interface are identified; 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 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. Based on the 3rd-level structural interface, 4th-level configuration interface and 5th-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 sand body connected body level are realized.

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

3. The method according to claim 1, characterized in that According to the outcrop sedimentary pattern of the branch channel 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, respectively, including: The combination of the 5-level structural bodies of the branch channel, the 5-level structural body corresponds to the composite channel sedimentary microfacies, the 5-level structural body has small lateral changes, and the sand body thickness map is compiled through the branch channel outcrop sedimentary model between the core wells, thereby predicting the morphology and boundary of the composite channel; The combination of the 4-level structural bodies of the branch channel, the 4-level structural body corresponds to a single channel, which is a rhythmic segment of a positive cycle. For the combination of the single channel of the 4-level structural body, the boundary of the 5-level composite channel is firstly used as a restriction; 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-joining profile along the water flow direction is determined, and then guided by the sedimentary structural pattern of the branch channel outcrops in the surrounding area, the distribution of the single channel on the core well is combined, and 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 boundaries of each single channel; again, the single channel is combined for 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 combination of the 3rd-level structural bodies of the branch waterway, within the single channel of the 4th-level structural body, combines the fine particles at the top of the coarse-grained sedimentary level at the bottom of the waterway inside the single channel of the 4th-level structural body according to the binary sedimentary law of the single channel, and determines the thickness and boundary of the bottom riverbed or top embankment deposits corresponding to the 3rd-level structural body.

4. The method according to claim 1, characterized in that: 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 internal interlayer of the high permeability zone and the interconnected body level of the sand body, including: The internal interlayer characterization refers to characterizing the interlayer distribution in the three-level configuration body, specifically, first identifying different interlayers, and then combining the different interlayers accordingly between wells, based on the well point data, using the boundary constraints of the three-level configuration body, and obtaining multiple interlayer plane thickness maps; 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 according to the distribution of the larger interlayer and the interface of the structure body, and combining the thickness of the internal interlayer with the thickness of the third-level structure body to obtain the plane thickness diagram of different connected bodies, and using the liquid production profile and water absorption profile for verification and corresponding adjustment; The high permeability zone is characterized as a connected body developed inside the coarse-grained sandstone at the bottom of the river channel deposits. 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 configuration body.

5. 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, logging curves and production data of the relevant well area; Rhythm and logging curve acquisition device, used to obtain lithology rhythm combination and logging curve form according to the core well rock 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 according to the obtained lithological rhythm combination and the logging curve morphology; A device for combining structures of various levels is used to combine and characterize the third-level structure body of the branch channel corresponding to the third-level structure interface, the fourth-level structure body of the branch channel corresponding to the fourth-level structure interface, and the fifth-level structure body of the branch channel corresponding to the fifth-level structure interface according to the sedimentary pattern of the branch channel outcrops in the surrounding area by using the method of combining structure bodies of branch channel according to the hierarchical structure; The sand body connectivity characterization device is used to obtain the internal connectivity of the sand body based on the 3rd-level structural interface, the 4th-level configuration interface and the 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 connectivity level.

6. 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, and when the instructions are executed by the processor, the electronic device executes the method according to any one of claims 1 to 4.

7. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein the device where the computer-readable storage medium is located during the execution time of the program executes the method according to any one of claims 1 to 4.

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