Construction method and construction device of sand body unit structure model, equipment and medium

Abstract

The invention provides a construction method and device of a sand body unit structure model, equipment and a medium, and the construction method comprises the steps: obtaining an isochronous tectonic plane of seismic interpretation through the logging data and seismic data of a research area, and further constructing an isochronous stratigraphic framework grid; depicting each lithologic target body of the research area by using logging data and seismic data of the research area, and identifying and acquiring the top surface and the bottom surface of each single sand body; an embedded modeling method is adopted, the top face and the bottom face of the single sand body are embedded into an isochronous stratigraphic framework grid, a single sand body enveloping face is obtained, the single sand body enveloping face is filled, and a single sand body model is obtained; and longitudinally superposing the single sand body models to obtain a sand body unit structure model of the research area. The construction method can solve the problem that the lithologic sand body cannot be accurately represented due to the fact that the top surface and the bottom surface of the reservoir sand body and the top surface and the bottom surface of the isochronous structure have no isochronous significance due to the fact that the top surface and the bottom surface of the sand body explained by geophysical tracking have no isochronous significance in the modeling process.

Description

Technical Field

[0001] The invention relates to the field of sand body geological modeling, and in particular to a method for constructing a sand body unit structure model and a construction device, equipment and medium. Background Art

[0002] At present, there is often a problem of inconsistency between geological isochronous interfaces and sand body interfaces tracked by geophysics, and it is time-consuming and difficult to track each set of sand body isochronous interfaces by geophysical methods. Therefore, how to accurately characterize lithological sand bodies has become a major challenge in the process of 3D geological modeling.

[0003] However, the top and bottom surfaces of the sand bodies interpreted by current geophysical tracking do not have isochronous significance, which is inconsistent with the isochronous structural surface. As a result, in the modeling process, the top and bottom surfaces of the reservoir sand bodies and the top and bottom surfaces of the isochronous structures penetrate and clash with each other. These problems make the accurate characterization of lithologic sand bodies a major difficulty in three-dimensional geological modeling. Summary of the invention

[0004] In view of the problems existing in the prior art, the purpose of the present invention is to provide a method and device, equipment, and medium for constructing a sand body unit structure model, so as to solve the problem that the interpreted top and bottom surfaces of the sand body do not have isochronous significance, resulting in the top and bottom surfaces of the reservoir sand body and the top and bottom surfaces of the isochronous structure intersecting during the modeling process, resulting in the inability to accurately characterize the lithological sand body.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present invention provides a method for constructing a sand body unit structure model, the construction method comprising:

[0007] The isochronous structural surface of seismic interpretation is obtained by using the well logging data and seismic data of the study area, and the isochronous stratigraphic grid is obtained by using the isochronous structural surface of seismic interpretation;

[0008] The logging data and seismic data of the study area are used to characterize the various lithological target bodies in the study area, and the top and bottom surfaces of each single sand body are identified;

[0009] The top and bottom surfaces of a single sand body are embedded into the isochronous stratigraphic grid using an embedded modeling method to obtain the single sand body envelope surface, which is then filled to obtain a single sand body model.

[0010] Each single sand body model in the study area is vertically superimposed to obtain the sand body unit structure model of the study area.

[0011] As a preferred technical solution of the present invention, the method for obtaining the isochronous structural surface of the seismic interpretation includes: using logging data to divide the stratigraphic sequence and obtain the stratigraphic interface; through time-depth conversion, obtaining the correspondence between the seismic reflection characteristics and the logging curve, interpreting the stratigraphic interface on the seismic reflection profile, and obtaining the isochronous structural surface of the seismic interpretation.

[0012] As a preferred technical solution of the present invention, the logging data includes lithology, thickness, resistivity and acoustic wave velocity information included in the well point logging curve.

[0013] As a preferred technical solution of the present invention, the longitudinal grids of the isochronous stratigraphic framework grid are consistent with the stratigraphic deposition trend line, and the longitudinal grids with the same sequence number are isochronous.

[0014] As a preferred technical solution of the present invention, a three-dimensional isochronous stratigraphic framework is established by using a geophysical tracking method in combination with an isochronous stratigraphic framework grid.

[0015] As a preferred technical solution of the present invention, the logging data and seismic data for characterizing the various lithological target bodies in the study area include seismic profiles, three-dimensional seismic volume data, logging curves and their interpretation results.

[0016] As a preferred technical solution of the present invention, an embedded modeling method is used to embed the sand body unit structure model of the study area into a three-dimensional isochronous stratigraphic framework to obtain a three-dimensional sand body unit structure model of the study area.

[0017] In a second aspect, the present invention provides a device for constructing a sand body unit structure model, the device comprising:

[0018] An isochronous stratigraphic grid construction module uses well logging data and seismic data of the study area to obtain isochronous structural surfaces interpreted by seismic interpretation, and constructs an isochronous stratigraphic grid using the isochronous structural surfaces interpreted by seismic interpretation;

[0019] The module for acquiring the top and bottom surfaces of a single sand body uses the well logging data and seismic data of the study area to characterize each lithological target body in the study area and identify and acquire the top and bottom surfaces of each single sand body;

[0020] A single sand body model construction module, which adopts an embedded modeling method to embed the top surface and the bottom surface of the single sand body into the isochronous stratigraphic grid to obtain a single sand body envelope surface, and fills the single sand body envelope surface to obtain a single sand body model;

[0021] The sand body unit structure model building module vertically superimposes each single sand body model of the study area to obtain the sand body unit structure model of the study area.

[0022] In a third aspect, the present invention provides an electronic device, the electronic device comprising:

[0023] at least one processor; and a memory communicatively coupled to the at least one processor;

[0024] The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the method for constructing a sand body unit structure model described in the first aspect.

[0025] In a fourth aspect, an embodiment of the present invention provides a computer storage medium, wherein the computer storage medium stores computer executable instructions, and when the computer executable instructions are executed by a processor, the method for constructing a sand body unit structure model described in the first aspect is implemented.

[0026] Compared with the prior art solutions, the present invention has the following beneficial effects:

[0027] (1) The present invention provides a method for constructing a sand body unit structure model and a construction device, equipment, and medium. The construction method realizes accurate characterization of the isochronous structure of the sand body and solves the problem of inconsistency between the sand body interface and the isochronous structure surface in traditional geological modeling methods.

[0028] (2) The present invention provides a method for constructing a sand body unit structure model, which simplifies the structural modeling process, improves the modeling efficiency, and provides a new and efficient solution for three-dimensional geological modeling. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a flow chart of a method for constructing a sand body unit structure model provided in a specific embodiment of the present invention;

[0030] Figure 2 It is a schematic diagram of a device for constructing a sand body unit structure model provided in a specific embodiment of the present invention;

[0031] Figure 3 is a schematic diagram of an electronic device provided by a specific embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram of the seismic isochronous structural layer identified by combining well-seismic analysis obtained in Example 1 of the present invention;

[0033] Figure 5 is a schematic diagram of an isochronous stratigraphic grid obtained in Example 1 of the present invention;

[0034] Figure 6 This is a result diagram of the cross-sectional distribution characteristics of the lithological target body in the study area according to Example 1 of the present invention;

[0035] Figure 7 It is a schematic diagram of the top and bottom surfaces of the sand body envelope surface identified in Example 1 of the present invention;

[0036] Figure 8 Schematic diagram of a single sand body model established based on the top and bottom surfaces of the sand body envelope surface in Example 1 of the present invention;

[0037] Fig. 9 is a cross-sectional view of the sand body unit structure model of the entire study area in Example 1 of the present invention;

[0038] Fig.10 It is a three-dimensional sand body unit structure model diagram of the entire study area in Example 1 of the present invention.

[0039] In the figure: 100-isochronous stratigraphic framework grid construction module, 200-single sand body top and bottom surface acquisition module, 300-single sand body model construction module, 400-sand body unit structure model construction module;

[0040] 10 - electronic device, 11 - processor, 12 - ROM, 13 - RAM, 14 - bus, 15 - I / O interface, 16 - input unit, 17 - output unit, 18 - storage unit, 19 - communication unit.

[0041] The present invention is further described in detail below. However, the following examples are only simplified examples of the present invention and do not represent or limit the scope of protection of the present invention. The scope of protection of the present invention shall be subject to the claims. DETAILED DESCRIPTION

[0042] The technical solution of the present application is further described below through specific implementation methods.

[0043] The specific embodiment of the present invention provides a method for constructing a sand body unit structure model, the process of which is as follows: Figure 1 As shown, the construction method includes:

[0044] The isochronous structural surface of seismic interpretation is obtained by using the well logging data and seismic data of the study area, and the isochronous stratigraphic grid is obtained by using the isochronous structural surface of seismic interpretation;

[0045] The logging data and seismic data of the study area are used to characterize the various lithological target bodies in the study area, and the top and bottom surfaces of each single sand body are identified;

[0046] The top and bottom surfaces of a single sand body are embedded into the isochronous stratigraphic grid using an embedded modeling method to obtain the single sand body envelope surface, which is then filled to obtain a single sand body model.

[0047] Each single sand body model in the study area is vertically superimposed to obtain the sand body unit structure model of the study area.

[0048] When interpreting the top and bottom surfaces of sand bodies, the geological modeling method based on the structural interface usually assumes that these surfaces are isochronous. However, due to the complexity of the sand body deposition process, the top and bottom surfaces of the sand body may be formed at different times in different locations, or the transformation of the later tectonic movement will change the original shape and position of the sand body, resulting in the top and bottom surfaces no longer representing the depositional interface of the same period. Therefore, the top and bottom surfaces of the sand body obtained by the above method are not isochronous. The method for constructing a sand body unit structure model provided by the present invention, through the construction of an isochronous stratigraphic grid, combined with an embedded modeling method, embeds the top and bottom surfaces of the lithological target body obtained by fine characterization into the isochronous stratigraphic grid to obtain a single sand body envelope surface, so that the top and bottom surfaces of the single sand body model are isochronous; at the same time, since the longitudinal grids with the same sequence number of the isochronous stratigraphic grid are also isochronous, the interior of the single sand body model also conforms to isochronous, thereby realizing the accurate characterization of the isochronous structure of the single sand body model, and then each single sand body model is longitudinally superimposed to obtain the overall sand body unit structure model of the study area.

[0049] In a specific embodiment of the present invention, the method for obtaining isochronous structural surfaces interpreted by seismic includes: using logging data to divide the stratigraphic sequence and obtain the stratigraphic interface; through time-depth conversion, obtaining the correspondence between the seismic reflection characteristics and the logging curve, interpreting the stratigraphic interface on the seismic reflection profile, and obtaining the isochronous structural surfaces interpreted by seismic.

[0050] In a specific embodiment of the present invention, the logging data used for stratigraphic sequence division includes lithology, thickness, resistivity and acoustic wave velocity information included in the well point logging curve.

[0051] In a specific embodiment of the present invention, the principles of sequence stratigraphy are applied to perform stratigraphic sequence division. Sequence stratigraphy is a conventional method in the art, and the specific steps are not further limited herein.

[0052] In a specific embodiment of the present invention, well calibration is performed through the time-depth relationship of a single well, the logging curve is converted from the depth domain to the time domain, aligned with the seismic data on the same scale, and a corresponding relationship between the seismic reflection characteristics and the logging curve is established.

[0053] In a specific embodiment of the present invention, the time-depth relationship of a single well can be determined by VSP logging.

[0054] In a specific embodiment of the present invention, isochronous structural surfaces from seismic interpretation are used to generate isochronous stratigraphic framework grids in combination with well correlation, stratification and stratigraphic development characteristics in the study area.

[0055] In a specific embodiment of the present invention, the longitudinal grids of the isochronous stratigraphic framework grid are consistent with the stratigraphic deposition trend line, and the longitudinal grids with the same sequence number are isochronous.

[0056] In a specific embodiment of the present invention, a three-dimensional isochronous stratigraphic framework is established by using a geophysical tracking method in combination with an isochronous stratigraphic framework grid.

[0057] In a specific embodiment of the present invention, geophysics is used to track isochronous and isochronous structural surfaces at different depths, and a three-dimensional isochronous stratigraphic framework is constructed based on the constraints of isochronous and isochronous structural surfaces at different depths.

[0058] In a specific embodiment of the present invention, a sand body fine-delineation method is used to characterize each lithological target body in the study area one by one.

[0059] In a specific embodiment of the present invention, the logging data and seismic data used to characterize the various lithological target bodies in the study area include seismic profiles, three-dimensional seismic volume data, logging curves and their interpretation results.

[0060] In a specific implementation of the present invention, the seismic profile may be a Vp / Vs profile.

[0061] In one specific embodiment of the present invention, a method for embedding the top and bottom surfaces of a single sand body into an isochronous stratigraphic grid using an embedded modeling method may include:

[0062] Keep the grid resolution of the top and bottom surfaces of individual sand bodies consistent with the resolution and coordinate system of the isochronous stratigraphic framework grid;

[0063] The top and bottom surfaces of a single sand body are merged with the corresponding isochronous surfaces in the stratigraphic framework, and the node coordinates of the top and bottom surfaces of the single sand body can be adjusted by an interpolation algorithm;

[0064] Sedimentary facies maps or seismic facies boundaries are used to limit the planar distribution range of sand bodies within the stratigraphic framework.

[0065] In a specific embodiment of the present invention, the mathematical model and software (such as Petrel software) used in embedded modeling are conventional mathematical models and software in the art and are not further limited herein.

[0066] In a specific embodiment of the present invention, the single sand body envelope surface can be filled by methods such as interpolation, function modeling or random simulation. The mathematical model and software used are conventional mathematical models and software in the art and are not further limited here.

[0067] In a specific embodiment of the present invention, the vertical stacking of single sand body models is a conventional method in the art and is not further limited herein.

[0068] In a specific embodiment of the present invention, an embedded modeling method is used to embed the sand body unit structure model of the study area into a three-dimensional isochronous stratigraphic framework to obtain a three-dimensional sand body unit structure model of the study area.

[0069] A specific embodiment of the present invention provides a device for constructing a sand body unit structure model, the device comprising:

[0070] An isochronous stratigraphic framework grid construction module 100 uses well logging data and seismic data of a study area to obtain an isochronous structural surface interpreted by seismic interpretation, and constructs an isochronous stratigraphic framework grid using the isochronous structural surface interpreted by seismic interpretation;

[0071] The single sand body top and bottom acquisition module 200 uses the well logging data and seismic data of the study area to characterize each lithological target body in the study area, and identifies and acquires the top and bottom surfaces of each single sand body;

[0072] The single sand body model building module 300 adopts an embedded modeling method to embed the top and bottom surfaces of the single sand body into the isochronous stratigraphic grid to obtain a single sand body envelope surface, and fills the single sand body envelope surface to obtain a single sand body model;

[0073] The sand body unit structure model building module 400 vertically superimposes each of the single sand body models of the study area to obtain the sand body unit structure model of the study area.

[0074] A specific embodiment of the present invention provides an electronic device, which is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0075] like Figure 3 As shown, the electronic device 10 includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 to the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. The I / O interface 15 is also connected to the bus 14.

[0076] A number of components in the electronic device 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0077] The processor 11 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, digital signal processors (DSPs), and any appropriate processors, controllers, microcontrollers, etc. The processor 11 executes the various methods and processes described above, such as the aforementioned method for constructing a sand body unit structure model.

[0078] In a specific embodiment of the present invention, the method for constructing the aforementioned sand body unit structure model can be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed on the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the method for constructing the aforementioned sand body unit structure model described above can be executed. Alternatively, in other embodiments, the processor 11 can be configured to execute the method for constructing the aforementioned sand body unit structure model by any other appropriate means (for example, by means of firmware).

[0079] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0080] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0081] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in combination with an instruction execution system, device or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0082] To provide interaction with a user, the systems and techniques described herein may be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

[0083] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0084] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0085] In a specific embodiment of the present invention, a server is provided, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the aforementioned method for constructing a sand body unit structure model when executing the program.

[0086] Unless otherwise specifically stated, terms such as processing, computing, calculating, determining, displaying, etc. may refer to the actions and / or processes of one or more processing or computing systems, or similar devices, which operate and convert data represented as physical (e.g., electronic) quantities within registers or memories of a processing system into other data similarly represented as physical quantities within memories, registers, or other such information storage, transmission, or display devices of the processing system. Information and signals may be represented using any of a variety of different techniques and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips mentioned throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, light fields or particles, or any combination thereof.

[0087] Those skilled in the art will also appreciate that the various illustrative logic blocks, modules, circuits, and algorithm steps described in conjunction with the embodiments of the present invention may all be implemented as electronic hardware, computer software, or a combination thereof. In order to clearly illustrate the interchangeability between hardware and software, various illustrative components, blocks, modules, circuits, and steps are generally described above around their functions. Whether such functions are implemented as hardware or software depends on the specific application and the design constraints imposed on the entire system. A skilled person may implement the described functions in an alternative manner for each specific application, but such implementation decisions should not be interpreted as departing from the scope of protection of the present invention.

[0088] The steps of the method or algorithm described in conjunction with the embodiments herein may be directly embodied as hardware, a software module executed by a processor, or a combination thereof. The software module may be located in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a mobile disk, a CD-ROM, or any other form of storage medium well known in the art. An exemplary storage medium is connected to the processor so that the processor can read information from the storage medium and can write information to the storage medium. Of course, the storage medium may also be an integral part of the processor. The processor and the storage medium may be located in an ASIC. The ASIC may be located in a user terminal. Of course, the processor and the storage medium may also be present in a user terminal as discrete components.

[0089] For software implementation, the techniques described in the present invention can be implemented with modules (e.g., procedures, functions, etc.) that perform the functions described in the present application. These software codes can be stored in a memory unit and executed by a processor. The memory unit can be implemented within the processor or outside the processor. In the latter case, it is coupled to the processor in a communication manner via various means, which are well known in the art.

[0090] To better illustrate the present invention and facilitate understanding of the technical solution of the present invention, typical but non-limiting embodiments of the present invention are as follows:

[0091] Example

[0092] This embodiment provides a construction process of a sand body unit structure model, which is as follows:

[0093] A model was constructed for the sand body of the main layer of gas field A. The isochronous structural surfaces and faults of the sand body were obtained by seismic interpretation. Combined with the drilling comparative stratification results and the stratigraphic development characteristics of the study area, a structural isochronous stratigraphic framework grid was generated. The vertical grid was consistent with the stratigraphic deposition trend line, so that the vertical grids with the same sequence number had isochronous significance.

[0094] Specifically, faults are identified on the seismic profile and faults are combined on the plane using coherent volume attributes. Stratigraphic correlation and tracking interpretation are performed based on well-seismic calibration. Isochronous structural maps are generated based on the interpreted faults and horizons. The final true depth structural map is obtained based on time-depth conversion and combined with well point correction. Given that the geological stratification of well points is isochronous, structural grids are constructed using true structural maps, in which vertical grids with the same sequence number have isochronous significance.

[0095] According to the characteristics of regional stratigraphic development, the lithology, thickness, resistivity and acoustic velocity information reflected by the well point logging curves are used to divide the stratigraphic series based on the principles of sequence stratigraphy. The wells are calibrated through the time-depth relationship of a single well (such as VSP logging), and the correspondence between the seismic reflection characteristics and the logging curves is established. Then, each sequence interface with isochronous significance is interpreted on the seismic reflection profile.

[0096] Structural modeling based on isochronous stratigraphic framework refers to the use of isochronous structural surfaces obtained from seismic interpretation to establish stratigraphic layers with sedimentary isochronous significance ( Figure 4 ) to construct an isochronous stratigraphic framework grid.

[0097] The isochronous structural surface constructed by seismic interpretation is used to establish a structural model with isochronous significance. There are obvious stratigraphic marker layers in the A gas field in the study area, including seismic stability axis, cycle and fluid properties. For example, the H2 sand layer group shows a positive plus one negative cycle feature; the H3 top interface is a strong peak reflection in seismic, with continuous regional distribution, relatively stable and easy to track; the H3 bottom is a set of stable and thick sandstone, with an interface relationship of water below and gas above. Based on this, geophysical tracking of isochronous stratigraphic layers at different depths was carried out, and a three-dimensional isochronous stratigraphic framework was constructed based on the constraints of isochronous layers at different depths ( Figure 5 ), in the figure, well1, well2, well3, and well4 correspond to the wells in the study area.

[0098] Then, the seismic data body, Vp / Vs inversion body, well logging curves of drilled wells and logging interpretation results are combined, and the spatial distribution characteristics of the lithologic target body in the study area are characterized based on the calibration of the drilled sand body and the seismic body, and the top and bottom surfaces of single sand bodies in the depth domain are identified and obtained. Specifically, by analyzing the shape of the well point logging curve, the thickness of the sand body, the lithology and the matching of the width of the window axis and the reflection strength on the in-phase seismic profile in the depth domain, combined with the well-seismic calibration, the top and bottom surfaces of the sand body are clearly calibrated at the peak, trough or zero phase, and fine interpretation and tracking are carried out to obtain the top and bottom surfaces of single sand bodies in the depth domain. Then, the embedded modeling technology is applied to establish the structural model one by one based on the top and bottom surfaces of each precisely drawn sand body unit in the study area, and the sand body structural model of each single sand body unit is vertically superimposed to form the sand body unit structural model of the entire study area.

[0099] The pre-stack Vp / Vs inversion method is used to identify the sand bodies in the main layer of gas field A, and a low Vp / Vs threshold value is used to characterize each lithological target body one by one ( Figure 6 ), and then identify the top surface and ground surface of the single sand body ( Figure 7 ). Based on the structural model, the sand body unit envelope surface (X, Y, Z) is used as the basis, and the embedded modeling method is adopted. First, the top and bottom surfaces of the sand body are embedded to form the sand body envelope surface, and the sand body model is obtained by filling ( Figure 8 ), the structural model of each finely described sand body unit was established one by one using the embedding technology, and then the sand body unit structural model profile of the entire study area was formed by superposition ( Fig. 9 ) and the three-dimensional sand body unit structure model of the entire study area ( Fig.10 , in the figure, well1, well2, well3, well4 correspond to the wells in the study area).

[0100] It is stated that the present invention illustrates the detailed structural features of the present invention through the above embodiments, but the present invention is not limited to the above detailed structural features, that is, it does not mean that the present invention must rely on the above detailed structural features to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of the components selected by the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

[0101] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0102] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0103] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A method for constructing a sand body unit structure model, characterized in that: The construction method comprises: Using the well logging data and seismic data of the study area to obtain the isochronous structural surface of the seismic interpretation, and using the isochronous structural surface of the seismic interpretation to construct the isochronous stratigraphic grid; The logging data and seismic data of the study area are used to characterize the various lithological target bodies in the study area, and the top and bottom surfaces of each single sand body are identified; The top and bottom surfaces of the single sand body are embedded into the isochronous stratigraphic grid using an embedded modeling method to obtain a single sand body envelope surface, and the single sand body envelope surface is filled to obtain a single sand body model; Each single sand body model of the study area is vertically superimposed to obtain the sand body unit structure model of the study area.

2. The construction method according to claim 1, characterized in that: The method for obtaining the isochronous structural surface of the seismic interpretation includes: using logging data to divide the stratigraphic sequence and obtain the stratigraphic interface; through time-depth conversion, obtaining the correspondence between the seismic reflection characteristics and the logging curve, interpreting the stratigraphic interface on the seismic reflection section, and obtaining the isochronous structural surface of the seismic interpretation.

3. The construction method according to claim 2, characterized in that: The logging data includes lithology, thickness, resistivity and acoustic wave velocity information included in the well point logging curve.

4. The construction method according to claim 1, characterized in that: The longitudinal grids of the isochronous stratigraphic framework grid are consistent with the stratigraphic deposition trend line, and the longitudinal grids with the same sequence number are isochronous.

5. The construction method according to claim 1, characterized in that: A three-dimensional isochronous stratigraphic framework is established by utilizing a geophysical tracking method in combination with the isochronous stratigraphic framework grid.

6. The construction method according to claim 1, characterized in that: The logging and seismic data used to characterize the various lithologic target bodies in the study area include seismic profiles, three-dimensional seismic volume data, logging curves and their interpretation results.

7. The construction method according to claim 5, characterized in that: The embedded modeling method is used to embed the sand body unit structure model of the study area into the three-dimensional isochronous stratigraphic framework to obtain the three-dimensional sand body unit structure model of the study area.

8. A device for constructing a sand body unit structure model, characterized in that: The construction device comprises: An isochronous stratigraphic grid construction module uses well logging data and seismic data of the study area to obtain isochronous structural surfaces interpreted by seismic interpretation, and constructs an isochronous stratigraphic grid using the isochronous structural surfaces interpreted by seismic interpretation; The single sand body top and bottom acquisition module uses the well logging data and seismic data of the study area to characterize the various lithological target bodies in the study area and identify and obtain the top and bottom surfaces of each single sand body; A single sand body model construction module, which adopts an embedded modeling method to embed the top surface and the bottom surface of the single sand body into the isochronous stratigraphic grid to obtain a single sand body envelope surface, and fills the single sand body envelope surface to obtain a single sand body model; The sand body unit structure model building module vertically superimposes each single sand body model of the study area to obtain the sand body unit structure model of the study area.

9. An electronic device, characterized in that: The electronic device comprises: at least one processor; and a memory communicatively coupled to the at least one processor; The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the method for constructing a sand body unit structure model according to any one of claims 1 to 7.

10. A computer storage medium, characterized in that: The computer storage medium stores computer executable instructions, and when the computer executable instructions are executed by a processor, the method for constructing a sand body unit structure model according to any one of claims 1 to 7 is implemented.

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