A method and system for single sand body configuration of horizontal wells

Abstract

This invention discloses a method and system for identifying single sand body configurations in horizontal wells. The method determines the vertical configuration pattern of single sand bodies in cored vertical wells; identifies the vertical configuration interface of single sand bodies in non-cored vertical wells; quantitatively identifies the vertical configuration interface of single sand bodies in horizontal wells; constructs a comparative framework of vertical-horizontal well configurations reflecting structural trends; comprehensively classifies the vertical sand body encounters along the horizontal well trajectory based on the horizontal well vertical configuration interface, formation variation trends, and well trajectory trends; determines the type of single sand body configuration unit in the horizontal well; and determines the lateral contact relationship of single sand bodies in the horizontal well, thus completing the configuration of the single sand body in the horizontal well. This method enables single sand body configuration analysis in low-density vertical-horizontal well mixed development areas, and applies horizontal wells for planar single sand body distribution trend analysis and boundary delineation. It significantly reduces the uncertainty in inter-well sand body connectivity analysis and planar sand body distribution prediction, overcoming the limitations of previous studies relying solely on vertical wells.

Description

Technical Field

[0001] This invention belongs to the technical field of petroleum geological exploration and development analysis methods, and relates to a method and system for identifying single sand body configurations in horizontal wells. Background Technology

[0002] The study of single sand body configurations is a crucial foundational task in reconstructing a high-precision reservoir characterization system for understanding the subsurface. The core elements of single sand body configurations are the identification of vertical configuration interfaces and lateral connectivity. Currently, methods for identifying single sand body configurations in a dense well network with vertical wells are relatively mature: vertical configuration interfaces are identified by characterizing interlayers; the type of configuration element units is determined through core calibration and logging curve morphology; lateral connectivity is judged by comparing single sand body thickness, top-to-bottom elevation difference, and curve response characteristics; and finally, the configuration results are verified based on dynamic production characteristics.

[0003] However, research on the configuration of single sand bodies in development blocks with low well density or mixed well networks is quite difficult, especially in horizontal wells where research remains relatively weak. Current research on the configuration of single sand bodies in horizontal wells is limited to assessing the lateral connectivity of single sand bodies encountered by the horizontal well itself within the same depositional period. Research on the connectivity between sand bodies in horizontal wells and adjacent wells, as well as the configuration of single sand bodies in reservoirs encountered by horizontal wells that may represent different depositional periods, remains lacking. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a method and system for defining single sand body configurations in horizontal wells, thereby solving the technical problem of fine characterization of reservoir sedimentary facies and sand body distribution under conditions of sparse well networks or horizontal well development in oilfields.

[0005] This invention is achieved through the following technical solution:

[0006] A method for configuring a single sand body in a horizontal well includes the following steps:

[0007] S1: Based on the detailed description of the core, combined with the electrical characteristics of the logging curves, and integrated with the sedimentary cycle theory, the development characteristics of interlayers in the target layer are determined. The vertical superposition relationship of sedimentary, lithological, single sand bodies of different periods and their combinations corresponding to single microfacies sand bodies in the target layer is finely depicted, and the vertical configuration pattern of single sand bodies in the cored vertical well is determined.

[0008] S2: Quantitatively identify the vertical configuration interface of a single sand body in a non-cored vertical well based on the return rate of logging sensitive parameters;

[0009] S3: Quantitatively identify the vertical configuration interface of a single sand body in a horizontal well based on the identified vertical configuration interface of a single sand body in a non-cored vertical well;

[0010] S4: Construct a vertical-horizontal well configuration comparison framework that reflects the structural trend based on the top structural surface trend interpreted by the earthquake;

[0011] S5: Based on the vertical configuration interface of the horizontal well, the formation change trend and the well trajectory trend, the vertical drilling encounter of single sand bodies in the horizontal well trajectory is comprehensively divided into stages.

[0012] S6: Determine the single sand body configuration unit type of horizontal well configuration based on seismic interpretation;

[0013] S7: Based on the sedimentation model, determine the lateral contact relationship of the single sand body in the horizontal well and complete the configuration of the single sand body in the horizontal well.

[0014] Preferably, step S2 specifically comprises:

[0015] S21: Determine the type of interlayer at the interface and logging sensitive parameters based on the configuration interface characteristics of the core well;

[0016] S22: Calculate the return rate of the sensitive parameter. If the return rate of the sensitive parameter is greater than the set threshold, it is determined to be a configuration interface.

[0017] The return rate of the sensitive parameter is obtained by the following formula:

[0018]

[0019] Where: F is the return rate of the sensitive parameter;

[0020] H1 is the characteristic value of the surrounding rock curve above the configuration interface;

[0021] H2 is the characteristic value of the surrounding rock curve below the configuration interface;

[0022] B is the characteristic value of the curve at the configuration interface.

[0023] Preferably, step S4 specifically comprises:

[0024] S41: Select the pilot well of the horizontal well and the vertical well at the end of the target point parallel to the horizontal section to build a comparison grid.

[0025] S42: Based on the top structural trend interpreted by the earthquake and the elevation data of the top of the single well, a grid of the vertical well configuration that reflects the true structural trend is constructed, which is the closest to the end of the horizontal well pilot well-horizontal well-horizontal well.

[0026] Preferably, the well trajectory trend in step S5 includes a straight line, a V-shape, or a small well inclination.

[0027] Preferably, step S6 specifically comprises:

[0028] S61: Read the vertical thickness of a single sand body in each phase of a horizontal well;

[0029] S62: For meandering river deposits, based on the seismic interpretation of stratigraphic slices, the morphological unit type is determined to be either a point bar or an abandoned channel; for non-meandering river deposits, based on the characteristic that adjacent wells along the source direction have the same sedimentary features, if the thickness of a horizontal well is consistent with that of an adjacent well along the same source direction, then the horizontal well is also determined to be a morphological unit of the same type.

[0030] Preferably, the lateral contact relationship of a single sand body in the horizontal well in step S7 includes three types: connected, weakly connected, and not connected.

[0031] Preferably, after step S7, the method further includes analyzing the inter-well sand body connectivity based on oil testing, production testing, and production dynamic data to verify the configuration result. Specifically, this involves combining the dynamic data of the production wells and the injection-production response relationship to compare whether there is any influence between adjacent wells. If interference occurs, it indicates connectivity; otherwise, it indicates non-connectivity.

[0032] A horizontal well single sand body configuration system includes:

[0033] The cored vertical well single sand body vertical configuration pattern determination module is used to determine the development characteristics of interlayers within the target layer based on the detailed description of the core, combined with the electrical characteristics of the logging curves, and the comprehensive sedimentary cycle theory. It is used to finely characterize the sedimentary, lithological, and vertical superposition relationships of single sand bodies and their combinations corresponding to single microfacies sand bodies within the target layer, and to determine the vertical configuration pattern of the cored vertical well single sand body.

[0034] Non-cored vertical well single sand body vertical configuration interface identification module: The non-cored vertical well single sand body vertical configuration interface identification module is used to quantitatively identify the non-cored vertical well single sand body vertical configuration interface based on the return rate of logging sensitive parameters;

[0035] Horizontal well single sand body vertical configuration interface identification module: The horizontal well single sand body vertical configuration interface identification module is used to quantitatively identify the vertical configuration interface of the horizontal well single sand body based on the identified non-cored vertical well single sand body vertical configuration interface.

[0036] Vertical-horizontal well connection configuration comparison grid construction module: The vertical-horizontal well connection configuration comparison grid construction module is used to construct a vertical-horizontal well connection configuration comparison grid that reflects the structural trend based on the top structural surface trend interpreted by seismic analysis;

[0037] Horizontal well trajectory longitudinal encounter single sand body period division module: The horizontal well trajectory longitudinal encounter single sand body period division module is used to comprehensively divide the horizontal well trajectory longitudinal encounter single sand body period based on the horizontal well vertical configuration interface, formation change trend and well trajectory trend.

[0038] Horizontal Well Configuration Single Sandbody Configuration Unit Type Determination Module: The horizontal well configuration single sandbody configuration unit type determination module is used to determine the type of horizontal well configuration single sandbody configuration unit in conjunction with seismic interpretation;

[0039] Lateral contact relationship determination module for single sand bodies in horizontal wells: The lateral contact relationship determination module for single sand bodies in horizontal wells is used to determine the lateral contact relationship of single sand bodies in horizontal wells based on the sedimentation model and to complete the configuration of the single sand bodies in horizontal wells.

[0040] A terminal device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method described above.

[0041] A computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the above-described method.

[0042] Compared with the prior art, the present invention has the following beneficial technical effects:

[0043] This invention provides a method for identifying single sandbody configurations in horizontal wells. Through integrated vertical and horizontal well analysis, it determines the stages of vertical sandbody encounters and the lateral extension trends of single sandbody formations, combining seismic attributes, core data, logging data, and production dynamics data. This method enables single sandbody configuration analysis in low-density vertical-horizontal well mixed development zones. It utilizes horizontal wells for planar single sandbody distribution trend analysis and boundary delineation, significantly reducing the uncertainty in inter-well sandbody connectivity analysis and planar sandbody distribution prediction, overcoming the limitations of previous studies relying solely on vertical wells. Furthermore, the division of vertical single sandbody encounter stages in horizontal wells lays the foundation for reservoir production segmentation, overcoming the limitations of previous methods that solely relied on pilot well formation thickness to define horizontal well single sandbody boundaries for production segmentation. Attached Figure Description

[0044] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This is a schematic flowchart of a method for configuring a single sand body in a horizontal well according to the present invention.

[0046] Figure 2 This is a schematic diagram of a horizontal well single sand body configuration system according to the present invention;

[0047] Figure 3 This is a schematic diagram of the single sand body configuration of a vertical well in Embodiment 2 of the present invention;

[0048] Figure 4 This is a schematic diagram of the interface characteristics of a single sand body configuration in a vertical well in Embodiment 2 of the present invention. In this diagram, a represents a certain thickness of interlayer with a return rate f>50%, b represents an extremely thin interlayer with a return rate f>30%, and c represents no obvious interlayer with a return rate f>20%.

[0049] Figure 5 This is an interface identification diagram of the single sand body configuration of the J1 horizontal well in Embodiment 2 of the present invention;

[0050] Figure 6 This is a schematic diagram of the longitudinal single sand body phase division in a horizontal well in Embodiment 2 of the present invention;

[0051] Figure 7 This is a diagram showing the longitudinal single sand body phase division of the J1 horizontal well in Embodiment 2 of the present invention;

[0052] Figure 8 This is a schematic diagram of the inter-well lateral connectivity determination in Embodiment 2 of the present invention, where a represents connectivity, b represents weak connectivity, and c represents non-connectivity;

[0053] Figure 9 This is a diagram showing the configuration of a single sand body in a horizontal well in Embodiment 2 of the present invention. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0055] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0056] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0057] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0058] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0059] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0060] The present invention will now be described in further detail with reference to the accompanying drawings:

[0061] Example 1

[0062] like Figure 1 As shown, this invention discloses a method for configuring a single sand body in a horizontal well, characterized by comprising the following steps:

[0063] S1: Determine the vertical configuration pattern of a single sand body in a cored vertical well. Specifically, based on a detailed description of the core, combined with the electrical characteristics of the logging curves, and integrating the sedimentary cycle theory, determine the development characteristics of interlayers within the target layer, and finely characterize the sedimentary, lithological, and vertical superposition relationships of single sand bodies and their combinations corresponding to a single microfacies sand body within the target layer, thereby determining the vertical configuration pattern of a single sand body in a cored vertical well.

[0064] S2: Quantitatively identify the vertical configuration interface of a single sand body in a non-cored vertical well based on the return rate of logging sensitive parameters. Specifically: S21: Determine the type of interlayer and logging sensitive parameters of the configuration interface based on the configuration interface characteristics of the cored well.

[0065] S22: Calculate the return rate of the sensitive parameter. If the return rate of the sensitive parameter is greater than the set threshold, it is judged as a configuration interface. The threshold set here is the minimum return rate calculated by the logging curve corresponding to the interlayer of the vertical well.

[0066] The return rate of the sensitive parameter is obtained by the following formula:

[0067]

[0068] Where: F is the return rate of the sensitive parameter;

[0069] H1 is the characteristic value of the surrounding rock curve above the configuration interface;

[0070] H2 is the characteristic value of the surrounding rock curve below the configuration interface;

[0071] B is the characteristic value of the curve at the configuration interface.

[0072] S3: Quantitatively identify the vertical configuration interface of a single sand body in a horizontal well based on the identified vertical configuration interface of a single sand body in a non-cored vertical well;

[0073] S4: Based on the seismic interpretation of the top structural plane trend, construct a vertical-horizontal well configuration comparison framework reflecting the structural trend. Specifically:

[0074] S41: Select the pilot well of the horizontal well and the vertical well at the end of the target point parallel to the horizontal section to build a comparison grid.

[0075] S42: Based on the top structural trend interpreted by the earthquake and the elevation data of the top of the single well, a grid of the vertical well configuration that reflects the true structural trend is constructed, which is the closest to the end of the horizontal well pilot well-horizontal well-horizontal well.

[0076] S5: Based on the vertical configuration interface of the horizontal well, the formation change trend, and the well trajectory trend, the vertical drilling encounters of single sand bodies in the horizontal well trajectory are comprehensively divided into stages. Among them, the types of well trajectory trends include "I" shape, "V" shape, or small well inclination. If it is "I" shape, the vertical drilling encounters are single sand bodies of the same stage; if it is "small well inclination", the number of configuration interfaces encountered vertically corresponds to the number of single sand bodies encountered; if it is "V" shape, the number of configuration interfaces encountered vertically at the deepest formation is the number of single sand bodies encountered; multiple configuration interfaces encountered within a short distance during the well trajectory advance are actually the same configuration interface.

[0077] S6: Based on seismic interpretation, determine the single sand body configuration unit type of horizontal well configuration, specifically:

[0078] S61: Read the vertical thickness of a single sand body in each phase of a horizontal well;

[0079] S62: For meandering river deposits, based on the seismic interpretation of stratigraphic slices, the morphological unit type is determined to be either a point bar or an abandoned channel; for non-meandering river deposits, based on the characteristic that adjacent wells along the source direction have the same sedimentary features, if the thickness of a horizontal well is consistent with that of an adjacent well along the same source direction, then the horizontal well is also determined to be the same type of morphological unit.

[0080] S7: Based on the sedimentary model, determine the lateral contact relationship of single sand bodies in the horizontal well to complete the configuration of the single sand body in the horizontal well. The lateral contact relationship includes three types: connected, weakly connected, and disconnected. Specifically, this step involves classifying the lateral contact relationship of single sand bodies into three types based on their thickness and top-to-bottom elevation difference: connected, weakly connected, and disconnected. When the horizontal well does not encounter a stable interlayer in the lateral direction, if the logging interpretation of a single sand body in the same period of an adjacent well has the same or similar specific characteristics, and the top-to-bottom elevation and sand body thickness of the corresponding single sand body differ by 0.0–1.5 m, then it is preliminarily determined that the single sand bodies between the two wells are laterally connected; when the horizontal well does not encounter a stable interlayer in the lateral direction, if the logging interpretation of a single sand body in the same period of an adjacent well has the same or similar characteristics, and the top-to-bottom elevation and sand body thickness differ by 0.0–1.5 m, then it is preliminarily determined that the single sand bodies in the two wells are laterally connected. If two wells have identical or similar specific characteristics, and the difference in the top and bottom elevations and sand body thickness of the two sand bodies is greater than or equal to 1.5m and less than half the thickness of the thinner sand body, then it is preliminarily determined that the sand bodies of the two wells are partially connected laterally. When a horizontal well encounters a stable interlayer during transverse drilling, or when the logging interpretation of the sand body of the two wells is significantly inconsistent with that of the adjacent well, and the difference in the top elevation or sand body thickness of the two sand bodies is greater than half the thickness of the thinner sand body, then it is preliminarily determined that the sand bodies of the two wells are not connected laterally.

[0081] S8: Analyze the inter-well sand body connectivity based on oil testing, production testing, and production dynamic data to verify the configuration results. Specifically, combine the dynamic data of the production wells and the injection-production response relationship to compare whether there is any influence between adjacent wells. If interference occurs, it indicates connectivity; otherwise, it indicates non-connectivity.

[0082] This invention utilizes a combined vertical and horizontal well approach to analyze single sand body configurations, determining the stages of vertical sand body encounters and the lateral extension trends of these sand bodies in horizontal wells. By combining seismic attributes, core data, logging data, and production dynamic data analysis, the invention verifies the single sand body configuration of horizontal wells using dynamic production data. This invention provides a method for identifying single sand body configurations in horizontal wells, enabling analysis in low-density mixed vertical and horizontal well development zones. It applies horizontal wells to analyze the planar distribution trend and define boundaries of single sand bodies, significantly reducing the uncertainty in inter-well sand body connectivity analysis and planar sand body distribution prediction, overcoming the limitations of previous studies relying solely on vertical wells. Furthermore, the division of vertical sand body encounter stages in horizontal wells lays the foundation for reservoir production segmentation, overcoming the limitations of previous methods that solely relied on pilot well formation thickness to define horizontal well single sand body boundaries for production segmentation. Current technologies lack mature and systematic methods for studying single sandbody configurations in horizontal wells. They primarily focus on determining whether a horizontal well trajectory in a straight line encounters a single sandbody boundary within a specific, singular sedimentary context, particularly when encountering the same single sandbody from the same formation. In areas with rapid sedimentary and tectonic changes, the single sandbody configurations of horizontal wells penetrating different strata and sedimentary facies have not yet been addressed. The method described in this invention will provide valuable insights for the detailed characterization of reservoir sedimentary sandbodies and the spatial distribution of configuration units under horizontal well network conditions in oilfields.

[0083] In addition, such as Figure 2 As shown, the present invention also discloses a horizontal well single sand body configuration system, comprising:

[0084] The cored vertical well single sand body vertical configuration pattern determination module is used to determine the development characteristics of interlayers within the target layer based on the detailed description of the core, combined with the electrical characteristics of the logging curves, and the comprehensive sedimentary cycle theory. It is used to finely characterize the sedimentary, lithological, and vertical superposition relationships of single sand bodies and their combinations corresponding to single microfacies sand bodies within the target layer, and to determine the vertical configuration pattern of the cored vertical well single sand body.

[0085] Non-cored vertical well single sand body vertical configuration interface identification module: The non-cored vertical well single sand body vertical configuration interface identification module is used to quantitatively identify the non-cored vertical well single sand body vertical configuration interface based on the return rate of logging sensitive parameters;

[0086] Horizontal well single sand body vertical configuration interface identification module: The horizontal well single sand body vertical configuration interface identification module is used to quantitatively identify the vertical configuration interface of the horizontal well single sand body based on the identified non-cored vertical well single sand body vertical configuration interface.

[0087] Vertical-horizontal well connection configuration comparison grid construction module: The vertical-horizontal well connection configuration comparison grid construction module is used to construct a vertical-horizontal well connection configuration comparison grid that reflects the structural trend based on the top structural surface trend interpreted by seismic analysis;

[0088] Horizontal well trajectory longitudinal encounter single sand body period division module: The horizontal well trajectory longitudinal encounter single sand body period division module is used to comprehensively divide the horizontal well trajectory longitudinal encounter single sand body period based on the horizontal well vertical configuration interface, formation change trend and well trajectory trend.

[0089] Horizontal Well Configuration Single Sandbody Configuration Unit Type Determination Module: The horizontal well configuration single sandbody configuration unit type determination module is used to determine the type of horizontal well configuration single sandbody configuration unit in conjunction with seismic interpretation;

[0090] Lateral contact relationship determination module for single sand bodies in horizontal wells: The lateral contact relationship determination module for single sand bodies in horizontal wells is used to determine the lateral contact relationship of single sand bodies in horizontal wells based on the sedimentation model and to complete the configuration of the single sand bodies in horizontal wells.

[0091] In a further preferred embodiment, the horizontal well single sand body configuration system also includes a verification module. The verification module is used to analyze the inter-well sand body connectivity based on oil testing, production testing, and production dynamic data to verify the configuration results. Specifically, the verification process involves combining the dynamic data of the production wells and the injection-production response relationship to compare whether there is any influence between adjacent wells. If interference occurs, it indicates connectivity; otherwise, it indicates non-connectivity.

[0092] Example 2

[0093] To further explain the technical solution of this invention, a specific analysis and illustration are provided using the J block of the L oilfield as an example. The target layer in the study area mainly develops two subfacies: braided river delta front and meandering river. The main source direction of the meandering river is east-west, with point bar sand bodies being the main reservoir sand bodies. The main source direction of the delta front is northeast-southwest, with subaqueous distributary channel sand bodies being the main reservoir sand bodies. It should be noted that the embodiments described herein are merely for explaining the invention and are not intended to limit the invention. Any modifications, substitutions, and improvements made within the principles of this invention are within the scope of protection of this invention.

[0094] S1: Determine the vertical configuration pattern of a single sand body in the coring well.

[0095] Guided by the sedimentary model, the vertical configuration patterns of individual sand bodies are determined based on the core rhythm characteristics and logging curve cycles. The sedimentary cycle characteristics, configuration unit types, microstructures, corresponding depth and thickness data, and vertical superposition relationships between individual sand bodies and their combinations are clarified.

[0096] like Figure 3As shown, within the target layer of well J3, a total of six sets of single sand bodies developed from bottom to top, denoted by codes 1-6. The thickness of each set of single sand bodies varies, mainly ranging from 2-5m. For example, the single sand body with code 2 (point dam) corresponds to a "box-shaped" electrical characteristic with a thickness of 3.5m; the single sand body with code 3 (submarine distributary channel) corresponds to a "box-shaped" electrical characteristic with a thickness of 3m; and the single sand body with code 4 (submarine distributary channel) corresponds to a "bell-shaped" electrical characteristic with a thickness of 2.2m. A 2m mudstone interlayer develops between single sand bodies with codes 3 and 2, and a 1.1m mudstone interlayer develops between single sand bodies with codes 3 and 4. The single sand body with code 3 is vertically isolated and not connected vertically.

[0097] S2: As Figure 4 As shown, the vertical configuration interface of a single sand body is quantitatively identified: based on the configuration interface characteristics of the cored well, the configuration interface is determined to be mainly composed of clayey and calcareous interlayers, and the main logging sensitive parameter curves are gamma, sonic, density, and resistivity of the flushed zone. When the return rate F of each sensitive parameter is greater than 20% (for this block, a = 20%), it is judged as a configuration interface.

[0098] S3: Identify the vertical configuration interface of a single sand body in a horizontal well based on S2: A total of 9 configuration interfaces were identified for the J1 horizontal well, such as... Figure 5 As shown.

[0099] S4: Construct a vertical-horizontal well configuration comparison framework that reflects structural trends;

[0100] For the configuration analysis of the J1 horizontal well, a comparative framework of single sand body configurations was constructed from the J2-J1 horizontal well to the J1 pilot well. Based on the structural interpretation results of the seismic data and the elevation data of the single wells, the structure from J2 to J1 first rises and then falls, while the structure from the J1 horizontal well to the J1 pilot well gradually decreases.

[0101] S5: Based on the vertical configuration interface of the horizontal well, the formation change trend and the well trajectory trend, the stages of encountering vertical single sand bodies in the horizontal well trajectory are comprehensively divided.

[0102] Based on five structural interfaces, after the J1 horizontal well entered the target at point A, it encountered three phases of single sand bodies: AB was phase one (encountering three structural interfaces), BC was phase two (encountering one structural interface), and CD was phase three (encountering three structural interfaces, extremely thin). Near point D, a calcareous-muddy interlayer was encountered at the bottom of the phase three underwater distributary channel single sand body (encountering one structural interface, extremely thin). Subsequently, due to the upward curve of the trajectory and formation uplift, the well failed to penetrate this muddy interlayer and returned to the phase three single sand body. Figure 6 As shown.

[0103] S6: Guided by sedimentary models, determine the type of single sandbody configuration unit in horizontal wells based on single sandbody thickness and seismic interpretation attribute slices:

[0104] The first phase of single sand bodies is a meandering river deposit, which can be directly identified as a point bar based on seismic interpretation stratigraphic slices. The second phase of single sand bodies is a network river deposit with a thickness of 3.5m, consistent with the thickness of the distributary channel in the vertical well, and is therefore identified as a distributary channel. The third phase of sand bodies is a deltaic deposit with a thickness of 4m, consistent with the thickness of the third phase of single sand bodies in the adjacent J3 well along the provenance direction, and is therefore identified as a subaqueous distributary channel deposit, similar to well J3. Figure 7 As shown.

[0105] S7: Using sedimentary models as a guide, determine the lateral contact relationship of single sand bodies in horizontal wells:

[0106] Lateral contact relationships of single sand bodies are classified into three types: connected, weakly connected, and disconnected. Figure 8 As shown.

[0107] Regarding the first phase of single sand bodies: Under the guidance of the meandering river deposition model, the logging curves of both the J1 horizontal well and the J2 well are bell-shaped. The vertical thickness of the single sand body in the J1 horizontal well is about 2m, and the height of the sand body from the top is about 0m; the thickness of the single sand body in the J2 well is 2m, and the height of the sand body from the top is about 1m; the J1 pilot well is an abandoned river channel with a sand thickness of 0m. The top and bottom elevations and vertical thickness of the single sand bodies in the same period of the J1 horizontal well and the J2 well differ by 0.0-1.5m. Therefore, it is preliminarily determined that the first phase of single sand bodies in the J1 horizontal well are connected to the J2 well, but not to the J1 pilot well.

[0108] For the second phase of single sand bodies: Under the guidance of the meandering network river deposition model, the logging curves of the single sand bodies in the distributary channel are all box-shaped. The thicknesses of the single sand bodies in wells J2, J1 horizontal well, and J1 pilot well are 3m, 3.5m, and 2.5m, respectively, and the height of the sand body from the top and bottom is 0m. The top and bottom elevations and vertical thickness of the sand bodies in the same period are between 0.0-1.5m. Therefore, it is preliminarily determined that the second phase of single sand bodies in well J1 horizontal well are connected to wells J2 and J1 pilot well.

[0109] Regarding the third-phase single sand body: Under the guidance of the delta front depositional model, the logging curve of the J1 horizontal well is bell-shaped, with a single sand body thickness of approximately 4m and a height from the top of the sand body of approximately 1m; the logging curve of the J2 single sand body is funnel-shaped, with a single sand body thickness of 1.3m and a height from the top of the sand body of approximately 1.6m; the logging curve of the J1 pilot well is funnel-shaped, with a single sand body thickness of 1.5m and a height from the top of the sand body of approximately 2.2m. Based on the fact that when the logging curve response characteristics of the second-phase single sand bodies in the two wells are significantly inconsistent, and the difference in the top elevation or the difference in the vertical thickness of the second-phase single sand body is greater than half the thickness of the smaller single sand body, it is preliminarily determined that the single sand bodies between the two wells are not laterally connected. It is preliminarily determined that the third-phase single sand body in the J1 horizontal well is not connected to either the J2 well or the J1 pilot well. Figure 9 As shown.

[0110] S8: Analyze the inter-well sand body connectivity based on oil testing, production testing, and production dynamic data to verify the configuration results.

[0111] According to the verification of oil testing, production and dynamic data, the neutron lifetime test of the J2 well in the high position in 2008 showed that the fourth phase single sand body was already highly flooded. The water cut of the J2 and J3 wells had reached 100%. Under the condition that the fourth phase single sand body in this area had good connectivity, the water cut of the J1 horizontal well at the same time was only 40%. This also proves that the J1 horizontal well did not encounter the fourth phase single sand body and the third phase single sand body was not connected.

[0112] A schematic diagram of a terminal device according to an embodiment of the present invention. The terminal device of this embodiment includes: a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps in the various method embodiments described above. Alternatively, when the processor executes the computer program, it implements the functions of each module / unit in the various device embodiments described above.

[0113] The computer program can be divided into one or more modules / units, which are stored in the memory and executed by the processor to complete the present invention.

[0114] The terminal device may be a desktop computer, laptop, handheld computer, or cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0115] The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0116] The memory can be used to store the computer program and / or module. The processor implements various functions of the terminal device by running or executing the computer program and / or module stored in the memory and calling the data stored in the memory.

[0117] If the modules / units integrated into the terminal device are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the content included in the computer-readable medium can be appropriately added or removed according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electrical carrier signals and telecommunication signals.

[0118] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for configuring a single sand body in a horizontal well, characterized in that, Includes the following steps: S1: Based on the detailed description of the core, combined with the electrical characteristics of the logging curves, and integrated with the sedimentary cycle theory, the development characteristics of interlayers in the target layer are determined. The vertical superposition relationship of sedimentary, lithological, single sand bodies of different periods and their combinations corresponding to single microfacies sand bodies in the target layer is finely depicted, and the vertical configuration pattern of single sand bodies in the cored vertical well is determined. S2: Quantitatively identify the vertical configuration interface of a single sand body in a non-cored vertical well based on the return rate of logging sensitive parameters; S3: Quantitatively identify the vertical configuration interface of a single sand body in a horizontal well based on the identified vertical configuration interface of a single sand body in a non-cored vertical well; S4: Construct a vertical-horizontal well configuration comparison framework that reflects the structural trend based on the top structural surface trend interpreted by the earthquake; S5: Based on the vertical configuration interface of the horizontal well, the formation change trend and the well trajectory trend, the vertical drilling encounter of single sand bodies in the horizontal well trajectory is comprehensively divided into stages. S6: Determine the type of single sand body configuration unit in horizontal wells based on seismic interpretation; S7: Based on the sedimentation model, determine the lateral contact relationship of the single sand body in the horizontal well and complete the configuration of the single sand body in the horizontal well; Step S4 specifically involves: S41: Select the pilot well of the horizontal well and the vertical well at the end of the target point parallel to the horizontal section to build a comparison grid. S42: Based on the top structural trend interpreted by the earthquake and the elevation data of the top of the single well, a grid of the vertical well configuration that reflects the true structural trend is constructed, which is the closest to the end of the horizontal well pilot well-horizontal well-horizontal well.

2. The method for configuring a single sand body in a horizontal well according to claim 1, characterized in that, Step S2 specifically involves: S21: Determine the type of interlayer at the interface and logging sensitive parameters based on the configuration interface characteristics of the core well; S22: Calculate the return rate of the sensitive parameter. If the return rate of the sensitive parameter is greater than the set threshold, it is determined to be a configuration interface. The return rate of the sensitive parameter is obtained by the following formula: Where: F is the return rate of the sensitive parameter; H1 is the characteristic value of the surrounding rock curve above the configuration interface; H2 is the characteristic value of the surrounding rock curve below the configuration interface; B is the characteristic value of the curve at the configuration interface.

3. The method for configuring a single sand body in a horizontal well according to claim 1, characterized in that, The types of well trajectory trends in step S5 include "I" shape, "V" shape, or "small well inclination".

4. The method for configuring a single sand body in a horizontal well according to claim 1, characterized in that, Step S6 specifically involves: S61: Read the vertical thickness of a single sand body in each phase of a horizontal well; S62: For meandering river deposits, based on the seismic interpretation of stratigraphic slices, the morphological unit type is determined to be either a point bar or an abandoned channel; for non-meandering river deposits, based on the characteristic that adjacent wells along the source direction have the same sedimentary features, if the thickness of a horizontal well is consistent with that of an adjacent well along the same source direction, then the horizontal well is also determined to be a morphological unit of the same type.

5. The method for configuring a single sand body in a horizontal well according to claim 1, characterized in that, In step S7, the lateral contact relationship of a single sand body in a horizontal well includes three types: connected, weakly connected, and not connected.

6. The method for configuring a single sand body in a horizontal well according to claim 1, characterized in that, Step S7 is followed by analyzing the inter-well sand body connectivity based on oil testing, production testing, and production dynamic data to verify the configuration result. Specifically, this involves combining the dynamic data of the production wells and the injection-production response relationship to compare whether there is any influence between adjacent wells. If interference occurs, it indicates connectivity; otherwise, it indicates non-connectivity.

7. A horizontal well single sand body configuration system, characterized in that, A method for implementing a single sand body configuration in a horizontal well according to any one of claims 1 to 6 includes: The cored vertical well single sand body vertical configuration pattern determination module is used to determine the development characteristics of interlayers within the target layer based on the detailed description of the core, combined with the electrical characteristics of the logging curves, and the comprehensive sedimentary cycle theory. It is used to finely characterize the sedimentary, lithological, and vertical superposition relationships of single sand bodies and their combinations corresponding to single microfacies sand bodies within the target layer, and to determine the vertical configuration pattern of the cored vertical well single sand body. Non-cored vertical well single sand body vertical configuration interface identification module: The non-cored vertical well single sand body vertical configuration interface identification module is used to quantitatively identify the non-cored vertical well single sand body vertical configuration interface based on the return rate of logging sensitive parameters; Horizontal well single sand body vertical configuration interface identification module: The horizontal well single sand body vertical configuration interface identification module is used to quantitatively identify the vertical configuration interface of the horizontal well single sand body based on the identified non-cored vertical well single sand body vertical configuration interface. Vertical-horizontal well connection configuration comparison grid construction module: The vertical-horizontal well connection configuration comparison grid construction module is used to construct a vertical-horizontal well connection configuration comparison grid that reflects the structural trend based on the top structural surface trend interpreted by seismic analysis; Horizontal well trajectory longitudinal encounter single sand body period division module: The horizontal well trajectory longitudinal encounter single sand body period division module is used to comprehensively divide the horizontal well trajectory longitudinal encounter single sand body period based on the horizontal well vertical configuration interface, formation change trend and well trajectory trend. Horizontal Well Configuration Single Sandbody Configuration Unit Type Determination Module: The horizontal well configuration single sandbody configuration unit type determination module is used to determine the type of horizontal well configuration single sandbody configuration unit in conjunction with seismic interpretation; Lateral contact relationship determination module for single sand bodies in horizontal wells: The lateral contact relationship determination module for single sand bodies in horizontal wells is used to determine the lateral contact relationship of single sand bodies in horizontal wells based on the sedimentation model and to complete the configuration of the single sand bodies in horizontal wells.

8. A terminal device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the method as described in any one of claims 1 to 6.

9. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method as described in any one of claims 1 to 6.

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