Method for establishing anisotropic three-dimensional forward modeling model of glutenite

Abstract

The invention provides a glutenite anisotropy three-dimensional forward modeling method. The establishing method comprises the steps that 1, well seismic fine structure interpretation is carried out to obtain a standard layer position and glutenite fan body top and bottom surface layer position data in each stage; 2, forming a stratigraphic framework model of an initial three-dimensional forward modeling model according to the position data of the standard layer; 3, forming a glutenite block body model according to the top and bottom surface horizon data of the glutenite fan body, and embedding the glutenite block body model into the stratigraphic framework model to form a three-dimensional initial model; step 4, obtaining a statistical result by utilizing geostatistics statistics; and 5, endowing rock physical parameters to each stratum and the fan block model by using the statistical result to form a glutenite anisotropy three-dimensional forward modeling model. The problem of insufficient modeling precision caused by constant parameters in conventional modeling is avoided, and the established model is objective and reliable.

Description

Technical Field

[0001] The invention relates to the field of exploration geophysics, and in particular to a method for establishing an anisotropic three-dimensional forward model of a sandstone body. Background Art

[0002] Three-dimensional forward modeling can more realistically reflect the propagation process of underground waves and clarify the spatial reflection characteristics of reservoirs and structures. However, the establishment of complex three-dimensional models is relatively difficult, which has long been the main obstacle to seismic forward modeling. There are currently two commonly used methods for establishing three-dimensional forward models: one is based on actual geological landforms and well seismic data. This method has achieved good application results for large structural modeling, but for more detailed sedimentary models, it is overly dependent on seismic resolution and the interpretation scheme of interpreters, and has a large number of human influence factors. The second is to establish a theoretical model of a single rock physical parameter. This method usually uses constants when defining the rock physical parameters of the geological body, which cannot truly reflect the actual geological and sedimentary changes. Summary of the invention

[0003] In view of the above problems, the present invention is proposed to provide a method for establishing an anisotropic three-dimensional forward model of a sandstone mass, which overcomes the above problems or at least partially solves the above problems.

[0004] According to one aspect of the present invention, a method for establishing an anisotropic three-dimensional forward model of a sandstone body is provided, the method comprising:

[0005] Step 1: Fine structural interpretation of wells and seismic data to obtain standard layer positions and top and bottom surface data of sandstone fans of each period;

[0006] Step 2: forming a stratigraphic framework model of an initial three-dimensional forward model according to the standard layer stratigraphic data;

[0007] Step 3: forming a conglomerate block model according to the top and bottom surface data of the conglomerate fan, and embedding the conglomerate block model into the stratigraphic framework model to form a three-dimensional initial model;

[0008] Step 4: Use geostatistics to obtain statistical results;

[0009] Step 5: Use the statistical results to assign rock physical parameters to each stratum and fan block model to form an anisotropic three-dimensional forward model of the sandstone body.

[0010] Optionally, the detailed structural interpretation of well seismic data in step 1 specifically includes: comprehensively analyzing the three-dimensional seismic data, velocity data, and well data of the study area, interpreting the structure of the standard layer and the top and bottom surfaces of the sandstone fan based on the three-dimensional seismic data, and obtaining data of each layer.

[0011] Optionally, after obtaining the statistical results in step 4, the step further includes: clarifying the rock physical parameters of each stratum and fan according to the statistical results, and establishing a mathematical function relationship between the rock physical parameters of the sandstone fan and the sedimentation advancement distance.

[0012] Optionally, the determining the rock physical parameters of each formation and fan body according to the statistical results specifically includes: comprehensively studying the rock velocity test data and logging data in the study area and using geostatistics to calculate the rock physical parameters of each formation and fan body.

[0013] Optionally, the step 1: obtaining standard layer stratigraphic data and top and bottom stratigraphic data of each stage of sandstone fan by fine structural analysis of well seismic data specifically includes:

[0014] The comprehensive data is analyzed for the whole area and target layer;

[0015] The synthetic record is calibrated to clearly define the position of the reflection interface of the standard layer and the target layer, and a detailed interpretation is performed to obtain the top and bottom surface data of each standard layer and the target layer fan.

[0016] Optionally, the comprehensive data specifically includes: comprehensive well logging, mud logging and drilling data.

[0017] Optionally, in step 2, the stratigraphic grid model is established using the stratigraphic data of the standard layer reflecting the structural grid obtained in step 1.

[0018] Optionally, the step 3: forming a conglomerate block model according to the top and bottom surface data of the conglomerate fan, and embedding the conglomerate block model into the stratigraphic framework model to form a three-dimensional initial model specifically includes:

[0019] Using the top and bottom surface data of the sandstone fans of each period obtained in step 1, several lithology block models are established;

[0020] The lithologic block model is embedded in the stratigraphic framework model for structural fusion to form a three-dimensional numerical model.

[0021] Optionally, in step 5, the rock physical parameters of each formation are assigned according to the forward calculation requirements, the rock physical parameters of the fan body are defined according to the actual statistical mathematical function relationship, and an anisotropic three-dimensional forward model of the conglomerate body is established.

[0022] Optionally, when establishing the anisotropic three-dimensional forward model, the rock physical parameters include longitudinal wave velocity, shear wave velocity, density, porosity, permeability, and viscosity.

[0023] The present invention provides a method for establishing an anisotropic three-dimensional forward model of a conglomerate body, the method comprising: step 1: obtaining standard layer positions and top and bottom surface position data of conglomerate fans of each period by fine structural interpretation of well seismic data; step 2: forming a stratigraphic framework model of an initial three-dimensional forward model according to the standard layer position data; step 3: forming a conglomerate block model according to the top and bottom surface position data of the conglomerate fan, and embedding the conglomerate block model into the stratigraphic framework model to form a three-dimensional initial model; step 4: obtaining statistical results by using geostatistics; step 5: using the statistical results to assign rock physical parameters to each stratum and fan block model, and forming an anisotropic three-dimensional forward model of the conglomerate body. The problem of insufficient modeling accuracy caused by constant parameters in conventional modeling is avoided, and the established model is objective and reliable.

[0024] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0026] Figure 1 A flowchart of a specific embodiment of a method for establishing an anisotropic three-dimensional forward model of a conglomerate body provided in an embodiment of the present invention;

[0027] Figure 2 It is a three-dimensional display diagram of the standard layer of Shengli No. 1 work area in a specific embodiment of the present invention;

[0028] Figure 3 It is a cross-sectional view of the structural grid of Shengli 1 work area in a specific embodiment of the present invention;

[0029] Figure 4 It is a three-dimensional display diagram of the stratigraphic grid of Shengli No. 1 work area in a specific embodiment of the present invention;

[0030] Figure 5 It is a block model of several sandstone fans in Shengli No. 1 work area in a specific embodiment of the present invention;

[0031] Figure 6 It is a cross-sectional view of a three-dimensional initial model of Shengli No. 1 work area in a specific embodiment of the present invention;

[0032] Figure 7 It is a stereoscopic display diagram of anisotropic three-dimensional forward model of Shengli No. 1 work area in a specific embodiment of the present invention;

[0033] Figure 8 The figure is a schematic diagram showing the statistical velocity of each formation in Shengli Work Area in a specific embodiment of the present invention. DETAILED DESCRIPTION

[0034] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0035] The terms "comprises" and "having" and any variations thereof in the description embodiments, claims and drawings of the present invention are intended to cover non-exclusive inclusions, for example, including a series of steps or units.

[0036] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0037] Example 1

[0038] A specific embodiment 1 of the present invention is applied, Figure 1 The flowchart of the method for establishing an anisotropic three-dimensional forward model of a sandy conglomerate body of the present invention is as follows:

[0039] In step 101, the three-dimensional seismic data, velocity data, and well data of the study area are comprehensively analyzed, and the structural interpretation of the standard layer and the top and bottom surfaces of the sandstone fan is performed based on the three-dimensional seismic data to obtain data of each layer. Figure 2 The figure is a three-dimensional display of the standard layer of Shengli No. 1 work area in a specific embodiment of the present invention. The process enters step 102.

[0040] In step 102, the standard layer stratigraphic data obtained in step 101 is used to construct a structural framework and form a three-dimensional stratigraphic framework model. Figure 3 This is the cross-section diagram of the structural grid of the Shengli work area. Figure 4 The figure is a three-dimensional display diagram of the stratigraphic grid of Shengli No. 1 work area. The process enters step 103.

[0041] In step 103, the top and bottom surface layer data of the conglomerate fan obtained in step 101 are used to form a plurality of conglomerate block models, and the conglomerate block models are embedded in the stratigraphic grid model of step 2 to form a three-dimensional initial model. Figure 5 This is a block model of several sandstone fans in Shengli No. 1 work area. Figure 6 The initial three-dimensional model of Shengli No. 1 work area is shown in FIG.

[0042] In step 104, the rock velocity test data and logging data in the study area are comprehensively analyzed and geostatistics is used to determine the rock physical parameters of each formation and fan, and a mathematical function relationship between the rock physical parameters of the sandstone fan and the sedimentary advancement distance is established. Figure 8 This is a schematic diagram showing the statistics of the longitudinal wave velocity of each stratum in Shengli 1 work area in a specific embodiment of the present invention, where x is the deposition advance distance.

[0043] In step 105, the statistical results obtained in step 4 are used to assign rock physical parameters to each stratum and fan block model, thereby forming an anisotropic three-dimensional forward model of the conglomerate body. Figure 7 This is the anisotropic three-dimensional forward model of Shengli No. 1 work area.

[0044] This embodiment provides a method for establishing an anisotropic three-dimensional forward model of a sandstone body. The method can simply and quickly establish an anisotropic forward model suitable for three-dimensional forward simulation. The established model includes the variation law of sedimentary rock physical parameters based on sedimentary knowledge. The established model is objective and reliable. The three-dimensional forward simulation based on this model can clarify the seismic response characteristics of different sedimentary types or structural styles.

[0045] Example 2

[0046] The object of the present invention can be achieved by the following technical measures: a method for establishing an anisotropic three-dimensional forward model of a conglomerate body comprises: step 1, obtaining standard layer positions and top and bottom surface position data of conglomerate fans of each period by fine structural interpretation of well seismic data; step 2, forming a stratigraphic framework model of an initial three-dimensional forward model based on the standard layer position data of step 1; step 3, forming a conglomerate block model based on the top and bottom surface position data of the conglomerate fan obtained in step 1, and embedding it into the stratigraphic framework model of step 2 to form a three-dimensional initial model; step 4, using geological statistics to determine the rock physical parameters of each stratum and fan, and establishing a mathematical function relationship between the rock physical parameters of the conglomerate fan and the sedimentary advancement distance; step 5, using the statistical results obtained in step 4 to assign rock physical parameters to each stratum and fan block model, so as to form an anisotropic three-dimensional forward model of the conglomerate body.

[0047] The purpose of the present invention can also be achieved by the following technical measures:

[0048] In step 1, the 3D seismic data, velocity data, and well data of the study area are comprehensively analyzed, and the structural interpretation of the standard layer and the top and bottom surfaces of the sandstone fan is carried out based on the 3D seismic data to obtain data for each layer.

[0049] In step 2, the standard layer stratigraphic data obtained in step 1 are used to construct a structural framework and form a three-dimensional stratigraphic framework model.

[0050] In step 3, the top and bottom surface layers of the conglomerate fan obtained in step 1 are used to form several conglomerate block models, and the conglomerate block models are embedded in the stratigraphic framework model of step 2 to form a three-dimensional initial model;

[0051] In step 4, the rock velocity test data and logging data in the study area are integrated to clarify the rock physical parameters of each formation and fan using geostatistics, and a mathematical function relationship between the rock physical parameters of the sandstone fan and the sedimentary advancement distance is established.

[0052] In step 5, the statistical results obtained in step 4 are used to assign rock physical parameters to each stratum and fan block model to form an anisotropic three-dimensional forward model of the conglomerate body.

[0053] Beneficial effects: The method for establishing anisotropic three-dimensional forward model of conglomerate body of the present invention can establish anisotropic three-dimensional forward model of conglomerate body in a simple and fast manner. The three-dimensional forward simulation based on this can better guide the study of seismic reflection characteristics of conglomerate body of different sedimentary types, and further guide exploration evaluation. The method of the present invention is based on three-dimensional seismic data, makes full use of logging data, and carries out anisotropic modeling on the basis of sedimentary knowledge, avoiding the problem of insufficient modeling accuracy caused by constant parameters in conventional modeling, and the established model is objective and reliable.

[0054] The above specific implementation methods further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific implementation methods of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for establishing an anisotropic three-dimensional forward model of a sandstone mass, characterized in that: The establishment method comprises: Step 1: Fine structural interpretation of wells and seismic data to obtain standard layer positions and top and bottom surface data of sandstone fans of each period; Step 2: forming a stratigraphic framework model of an initial three-dimensional forward model according to the standard layer stratigraphic data; Step 3: forming a conglomerate block model according to the top and bottom surface data of the conglomerate fan, and embedding the conglomerate block model into the stratigraphic framework model to form a three-dimensional initial model; Step 4: Use geostatistics to obtain statistical results; Step 5: Use the statistical results to assign rock physical parameters to each stratum and fan block model to form an anisotropic three-dimensional forward model of the conglomerate body.

2. The method for establishing an anisotropic three-dimensional forward model of a sandstone mass according to claim 1, characterized in that: The detailed structural interpretation of well seismic data in step 1 specifically includes: comprehensively analyzing the three-dimensional seismic data, velocity data, and well data of the study area, interpreting the structure of the standard layer and the top and bottom surfaces of the sandstone fan based on the three-dimensional seismic data, and obtaining data for each layer.

3. The method for establishing an anisotropic three-dimensional forward model of a sandstone mass according to claim 1, characterized in that: After obtaining the statistical results in step 4, the method further includes: clarifying the rock physical parameters of each stratum and fan according to the statistical results, and establishing a mathematical function relationship between the rock physical parameters of the sandstone fan and the sedimentary advancement distance.

4. The method for establishing an anisotropic three-dimensional forward model of a sandstone mass according to claim 3, characterized in that: The rock physical parameters of each formation and fan body are determined based on the statistical results, which specifically includes: comprehensively studying the rock velocity test data and logging data in the area and using geostatistics to calculate the rock physical parameters of each formation and fan body.

5. The method for establishing an anisotropic three-dimensional forward model of a sandstone mass according to claim 1, characterized in that: The step 1: obtaining the standard layer position and the top and bottom surface position data of the sandstone and conglomerate fans of each period through fine structural interpretation of well seismic data specifically includes: The comprehensive data is analyzed for the whole area and target layer; The synthetic record is calibrated to clearly define the position of the reflection interface of the standard layer and the target layer, and a detailed interpretation is performed to obtain the top and bottom surface data of each standard layer and the target layer fan.

6. The method for establishing an anisotropic three-dimensional forward model of a sandstone mass according to claim 1, characterized in that: The comprehensive data specifically includes: comprehensive well logging, well logging and drilling data.

7. The method for establishing an anisotropic three-dimensional forward model of a sandstone mass according to claim 1, characterized in that: In step 2, a stratigraphic grid model is established using the stratigraphic data of the standard layer reflecting the structural grid obtained in step 1.

8. The method for establishing an anisotropic three-dimensional forward model of a sandstone mass according to claim 1, characterized in that: The step 3: forming a conglomerate block model according to the top and bottom surface data of the conglomerate fan, and embedding the conglomerate block model into the stratigraphic framework model to form a three-dimensional initial model specifically includes: Using the top and bottom surface data of the sandstone fans of each period obtained in step 1, several lithology block models are established; The lithologic block model is embedded in the stratigraphic framework model for structural fusion to form a three-dimensional numerical model.

9. The method for establishing an anisotropic three-dimensional forward model of a sandstone mass according to claim 1, characterized in that: In step 5, the rock physical parameters of each stratum are assigned according to the forward calculation requirements. The rock physical parameters of the fan body should be defined according to the actual statistical mathematical function relationship to establish an anisotropic three-dimensional forward model of the conglomerate body.

10. The method for establishing an anisotropic three-dimensional forward model of a sandstone mass according to claim 1, characterized in that: When the anisotropic three-dimensional forward model is established, the rock physical parameters include longitudinal wave velocity, shear wave velocity, density, porosity, permeability, and viscosity.

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