Three-dimensional embedded modeling and digital-analog method for isolated dam sand

Abstract

The invention relates to the field of geological modeling, in particular to a three-dimensional embedded modeling and digital-analog method for isolated dam sand. A three-dimensional embedded modeling method for isolated dam sand comprises the following steps that top and bottom boundaries of different isolated dam sand bodies are obtained according to a beach-bar facies reservoir sedimentary evolution phase diagram and a beach-bar facies reservoir sedimentary evolution three-dimensional mode diagram; identifying the boundary trend and form of each different isolated dam sand body on the seismic plane attribute graph; carrying out plane form correction on the top and bottom boundaries according to the trend and form of the boundaries, ensuring that the top and bottom boundaries explain three-dimensional closure, and obtaining three-dimensional closed boundaries; correcting the tendency of the three-dimensional closed boundary according to the dam sand tendency to obtain a corrected boundary; dam sand top and bottom curved surfaces of different isolated dam sand bodies are created according to the correction boundary; and the dam sand top and bottom curved surface is embedded into the beach sand traditional attribute model, and a beach bar sand body model is obtained. According to the method, the depicting precision of the dam sand boundary is improved, so that the dam sand boundary of the beach bar sand body model meets the calculation requirement.

Description

Technical Field

[0001] The present invention relates to the field of geological modeling, and particularly to a three-dimensional stereoscopic embedded modeling and digital simulation method for isolated dam sands. Background Art

[0002] Beach-bar sedimentary bodies are composed of high-quality and isolated dam sands and widely distributed beach sands with poor physical properties. The dam sands are often scattered, with rapid lateral changes in sand bodies, and are the main oil and gas reservoirs. The existing boundaries of dam sands mostly rely on the prediction of seismic plane attributes. Under the control of the plane boundaries, combined with the commonly used top-hole horizontal well development in offshore oil and gas fields, from the development experience of deep-layer dam sands in recent years, for isolated dam sands, the prediction accuracy of the plane boundary position cannot meet the needs of development wells for such reservoirs. High-precision three-dimensional stereoscopic dam sand models are urgently needed in the early stage of development wells to guide the trajectory design of high-quality reservoirs. From the research results, there are still deficiencies in the existing modeling and digital simulation methods for depicting isolated dam sands: First, the boundary depiction results of dam sands are not curved surfaces, and the mutual erosion relationship between isolated dam sand bodies is not considered, resulting in the three-dimensional reservoir model not reflecting the true underground situation and deviation in trajectory design; Second, the depiction of dam sand boundaries cannot meet the problem of the fusion degree between sand bodies during the reservoir digital simulation period, and the controllability of the boundaries in terms of flow conductivity and connection range setting is poor. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a three-dimensional stereoscopic embedded modeling and digital simulation method for isolated dam sands.

[0004] The technical solution adopted by the present invention to solve its technical problems is: A three-dimensional stereoscopic embedded modeling method for isolated dam sands, comprising the following steps:

[0005] Based on the sedimentary evolution facies map of beach-bar reservoirs and the three-dimensional pattern map of beach-bar reservoir sedimentary evolution, through the combination of logging and seismic interpretation, obtain the top and bottom boundaries of different isolated dam sand bodies;

[0006] Identify the boundary trend and shape of each of the different isolated dam sand bodies on the seismic plane attribute map;

[0007] Interpret the top and bottom boundaries of each sand body in the three-dimensional seismic work area according to the boundary trend and the shape, ensuring that the three-dimensional interpretation of the top and bottom boundaries is closed to obtain a three-dimensional closed boundary;

[0008] Correct the trend of the three-dimensional closed boundary interpreted by seismic three-dimensional tracking according to the dam sand trend obtained from logging well connection analysis to obtain a corrected boundary;

[0009] Create the top and bottom surfaces of the dam sand for each of the different isolated dam sand bodies according to the corrected boundary;

[0010] Embed the top and bottom surfaces of the dam sand into the traditional beach sand property model to obtain a beach-bar sand body model.

[0011] Preferably, according to the sedimentary evolution facies map of the beach-bar reservoir and the three-dimensional model diagram of the sedimentary evolution of the beach-bar reservoir, by combining well logging and seismic interpretation, the top and bottom boundaries of different isolated bar sands are obtained, including:

[0012] Determining the sedimentary evolution trend of the bar sand based on the sedimentary evolution facies map of the beach-bar reservoir;

[0013] Obtaining the stacking patterns and combination relationships of different isolated bar sands according to the three-dimensional model diagram of the sedimentary evolution of the beach-bar reservoir, so as to obtain 5-7 level boundary types;

[0014] Using the sedimentary evolution trend and the boundary types in combination with the results of the stage analysis of the isolated bar sands, three-dimensional tracking and interpretation of the top and bottom boundaries of different isolated bar sands are carried out on the three-dimensional seismic work area.

[0015] Preferably, the tendency of the bar sand obtained according to the well logging cross-well analysis is used to correct the tendency of the three-dimensional closed boundary of the seismic tracking interpretation to obtain a corrected boundary, including:

[0016] Determining the tendency of the bar sand by combining well logging data and three-dimensional seismic data;

[0017] Obtaining the sediment source direction from the sedimentary evolution facies map of the beach-bar reservoir;

[0018] The tendency of the bar sand in combination with the sediment source direction and the wave transformation direction is used to correct the three-dimensional closed boundary to obtain the corrected boundary.

[0019] Preferably, if the bar sand is an overlapping composite bar sand, the top and bottom surfaces of the bar sand are generated according to the tendency of the composite bar sand and the single well identified erosion points.

[0020] Preferably, creating the top and bottom surfaces of the bar sand according to the corrected boundary, including:

[0021] Combining the well point boundary positions in the corrected boundary with the thickness of the bar sand drilled in the well to create the top and bottom spatial surfaces of the bar sand.

[0022] Preferably, embedding the top and bottom surfaces of the bar sand into the traditional beach sand property model to obtain the beach-bar sand body model, including:

[0023] Respectively assigning the grid corresponding to the top and bottom boundaries of each bar sand body on the traditional beach sand property model to the boundary property value;

[0024] Respectively assigning the grids corresponding to the inside of the top and bottom boundaries of each bar sand body on the traditional beach sand property model to the bar sand property value to obtain the bar sand model.

[0025] Preferably, according to the formation periods of different dam sands, the top and bottom boundaries of each dam sand body and the grids inside the top and bottom boundaries of each dam sand body are assigned values in a preset order.

[0026] An isolated dam sand three-dimensional embedded numerical simulation method includes:

[0027] Obtain a beach-bar sand body model according to any of the above dam sand modeling methods;

[0028] According to the connectivity between the dam sand boundary and the beach sand in the three-dimensional reservoir model, extract the boundary of the beach-bar sand body model and assign permeability conductivity values;

[0029] Combined with reservoir production data, dynamically correct the attribute values of the boundary;

[0030] Import the corrected attribute values into the reservoir model to obtain an embedded beach-bar reservoir model.

[0031] Preferably, the dynamically correcting the attribute values of the boundary in combination with reservoir production data includes:

[0032] Obtain the actual production dynamic data of the production wells corresponding to the reservoir model;

[0033] If the change in the actual production dynamic data is less than or equal to a preset range, modify the attribute values of the boundary.

[0034] Preferably, the actual production dynamic data includes single-well liquid production, water cut increase, and production pressure difference.

[0035] Implementing the present invention has the following beneficial effects:

[0036] The present invention applies the modeling technology of depicting the top and bottom surfaces of isolated sand bodies to three-dimensionally embed dam sands into the beach sand background, obtaining an isolated dam sand three-dimensional embedded model. Thereby, it shows the mutual erosion situation between dam sands, improves the accuracy of depicting the dam sand boundary, and enables the dam sand boundary of the beach-bar sand body model to meet the requirements for calculating the fusion degree between sand bodies during the reservoir numerical simulation period. Furthermore, it improves the fitting accuracy of the dynamic of a single well in the reservoir and enhances the accuracy of the prediction result of the dynamic fitting of production wells. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The present invention will be further described below in conjunction with the drawings and embodiments:

[0038] Figure 1 It is a flowchart of the isolated dam sand three-dimensional embedded modeling method in an embodiment;

[0039] Figure 2 It is a schematic diagram of the three-dimensional pattern of sedimentary evolution of beach-bar reservoirs, the superimposed styles, combination relationships of different isolated dam sand bodies, and the 5-7 level dam sand boundaries in an embodiment;

[0040] Figure 3 It is an interpretation diagram of the dam sand boundary based on the seismic inversion profile in an embodiment;

[0041] Figure 4 It is a cross-well profile of an oilfield in an embodiment;

[0042] Figure 5 It is a seismic profile of an oilfield and an inversion profile of the longitudinal and transverse wave velocity ratio in an embodiment;

[0043] Figure 6 It is a three-dimensional stereoscopic embedded modeling process for isolated dam sand in an embodiment;

[0044] Figure 7 It is a three-dimensional stereoscopic embedded digital simulation process for isolated dam sand in an embodiment. Specific implementation manners

[0045] For a clearer understanding of the technical features, objectives, and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

[0046] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present invention. However, those skilled in the art should clearly understand that the present invention can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present invention.

[0047] A three-dimensional stereoscopic embedded modeling method for isolated dam sand provided by an embodiment of the present invention. As Figure 1 shown, the three-dimensional stereoscopic embedded modeling method for isolated dam sand includes the following steps:

[0048] According to the sedimentary evolution facies map of the beach-bar reservoir and the three-dimensional model map of the sedimentary evolution of the beach-bar reservoir, the top and bottom boundaries of different isolated dam sand bodies are obtained through the combination of well logging and seismic interpretation.

[0049] It should be noted that isolated dam sand refers to a relatively independent sandy sediment body in the sedimentary environment, usually spatially separated from other sedimentary bodies. Such sand bodies may form in environments such as rivers, deltas, and beaches, and their isolation may be caused by local changes in the sedimentary environment (such as water flow velocity, sediment supply, etc.).

[0050] Specifically, the three-dimensional pattern diagram of the sedimentary evolution of the beach-bar reservoir is a graphical tool used to display the distribution, morphology, structure, and their mutual relationships of the dam sand bodies in three-dimensional space. By analyzing the three-dimensional pattern diagram of the sedimentary evolution of the beach-bar reservoir, the geological characteristics of the dam sand bodies can be better understood, providing a scientific basis for oil and gas exploration and development.

[0051] Furthermore, the sedimentary evolution facies map of the beach-bar reservoir has the characteristics of the dam sand boundary.

[0052] Identify the boundary trend and morphology of each different isolated dam sand body on the seismic plane attribute map.

[0053] It should be noted that the seismic plane attribute map is a chart generated by extracting and processing seismic data, used to display the spatial distribution of seismic attributes.

[0054] Furthermore, the seismic plane attribute map includes seismic profiles and P-S wave profiles. In some scenarios, the oilfield seismic profiles and the inversion profiles of the P-S wave velocity ratio are used.

[0055] Interpret the top and bottom boundaries of each sand body in the 3D seismic work area according to the boundary trend and morphology, ensuring that the top and bottom boundary interpretations are three-dimensionally closed to obtain a three-dimensionally closed boundary.

[0056] Specifically, adjust the interpretation points of the top and bottom boundaries of the 3D seismic work area according to the boundary trend and morphology of the dam sand interpreted by well logging, ensuring that the distances between all interpretation points are within a preset range. In some embodiments, the interpretation points are moved according to the historical data of the corresponding oil wells to form a three-dimensionally closed boundary of the dam sand.

[0057] Correct the trend of the three-dimensionally closed boundary interpreted by seismic 3D tracing according to the trend of the dam sand obtained from well logging cross-well analysis to obtain a corrected boundary.

[0058] The trend of the dam sand usually determines the general trend of the dam sand boundary, which in turn leads to the complexity of the boundary shape. If the trend of the dam sand varies significantly in different regions, curved, branched, or interlaced boundaries may be formed.

[0059] At the same time, the trend of the dam sand will affect the propagation and reflection characteristics of seismic reflection waves, and thus affect the identification of the dam sand boundary. When the trend of the dam sand forms a certain angle with the incident direction of the seismic wave, the amplitude and phase of the reflected wave will change, and analyzing these changes can help determine the dam sand boundary.

[0060] Correcting the trend of the three-dimensionally closed boundary interpreted by seismic interpretation through the trend of the dam sand interpreted by cross-well logging can more accurately determine the dam sand boundary at an early stage, thus reducing the repetitive work and resource waste caused by inaccurate boundary identification.

[0061] Create the top and bottom surfaces of the dam sand for each different isolated dam sand body according to the corrected boundary.

[0062] Specifically, according to the trend and shape of the sand body boundary, combined with the plane migration law and plane distribution characteristics of the dam sand, correct the boundary shape. In some embodiments, the corrected boundary creates the top and bottom surfaces of different boundaries under the well point boundary position correction and the constraint of the mudstone drilling thickness encountered in the well.

[0063] Embed the top and bottom surfaces of the dam sand into the traditional beach sand property model to obtain the beach-dam sand body model.

[0064] Specifically, embed the top and bottom surfaces of the dam sand into the traditional beach sand property model to construct a beach-dam sand body model that better conforms to the actual geological situation, providing strong support for oil and gas exploration and development.

[0065] The present invention determines the top and bottom surfaces of the dam sand through borehole data, 3D seismic data, seismic inversion data volume, seismic plane attribute map, 3D pattern map of the sedimentary evolution of the beach-dam reservoir, etc., to ensure the accuracy of the top and bottom surfaces of the dam sand. Then embed the top and bottom surfaces of the dam sand into the traditional beach sand property model to obtain the beach-dam sand body model. The beach-dam sand body model generated by the present invention can finely depict the internal structure and sedimentary characteristics of the reservoir, including the thickness, width, extension direction, etc. of the sand body, can better explain the reflection characteristics in the seismic data, and identify the seismic facies and attributes related to the beach-dam sand body. Further, it provides a basis for the numerical simulation of the oil and gas reservoir and the design of the development plan.

[0066] In an executable embodiment, according to the sedimentary evolution facies map of the beach-dam reservoir and the 3D pattern map of the sedimentary evolution of the beach-dam reservoir, through the combination of well logging and seismic interpretation, obtain the top and bottom boundaries of different isolated dam sand bodies, including:

[0067] Determine the sedimentary evolution trend of the dam sand based on the 3D pattern map of the sedimentary evolution of the beach-dam reservoir.

[0068] It can be understood that according to the sedimentary facies map, construct a sedimentary model to explain the evolution of the sedimentary environment and obtain the sedimentary evolution trend.

[0069] Obtain the stacking pattern and combination relationship of different isolated dam sand bodies according to the 3D pattern map of the sedimentary evolution of the beach-dam reservoir, so as to obtain the boundary types of levels 5-7.

[0070] Specifically, according to the configuration boundary levels proposed by Wu Shenghe in 2013, etc.

[0071] Using the sedimentary evolution trend combined with the results of the stage analysis of the isolated dam sand body, three-dimensionally trace and interpret the top and bottom boundaries of different isolated dam sand bodies in the seismic work area.

[0072] Specifically, the horizons and faults of isolated dam sands are traced through manual or automatic tracking techniques. Manual tracking requires interpreters to mark according to the features on seismic profiles, while automatic tracking uses computer algorithms for automatic identification and tracking. This process can be combined with the sedimentary evolution trend to ensure the accuracy of tracking. For example, Figure 2 , Figure 3 As shown, combining the reservoir sedimentary evolution process and the three-dimensional spatial distribution pattern of sand bodies in this block, and combining the analysis of the stages of beach-bar sands in single wells and connected wells, the top and bottom surfaces of multiple isolated dam sands are traced and interpreted three-dimensionally on seismic profiles. Layer 1_top is the spatial surface of the top of the dam sand based on the seismic inversion profile in one embodiment, and Layer 1_bottom is the spatial surface of the bottom of the dam sand based on the seismic inversion profile in one embodiment.

[0073] In an executable embodiment, the trend of the three-dimensional closed boundary is corrected according to the trend of the dam sand to obtain a corrected boundary, including:

[0074] Correct the three-dimensional closed boundary interpreted on the seismic data volume according to the top and bottom data (including XYZ coordinates, Figure 4 ) of the boundaries of each sand body interpreted from the connected well profiles.

[0075] Specifically, the connected well data can come from the connected well profile diagram as shown in Figure 4 . Through the connected well profile diagram, the continuity of the dam sand between different wells can be clearly observed. The position and trend of the boundary are also obtained from the connected well profile diagram. By comparing the thicknesses of the dam sand at different wells, the lateral thickness change law of the dam sand is analyzed.

[0076] Obtain the sediment source direction from the three-dimensional model diagram of the sedimentary evolution of the beach-bar facies reservoir.

[0077] Furthermore, determining the sediment source direction can help identify favorable areas for hydrocarbon reservoir development and predict hydrocarbon enrichment zones.

[0078] The trend of the dam sand, combined with the sediment source direction and the wave transformation direction, is used to correct the three-dimensional closed boundary to obtain a corrected boundary.

[0079] Specifically, according to the trend of the dam sand and the sediment source direction, correct the trend of the three-dimensional closed boundary. The boundary trend should be consistent with the sediment transport direction and the wave transformation direction. Combining the wave transformation direction, correct the boundary shape. Wave action may cause erosion and re-deposition of sediments, making the boundary shape more smooth or complex. According to the trend of the dam sand and the sediment source direction, correct the boundary trend. The boundary trend should match the sediment deposition direction and the wave transformation direction. Furthermore, the corrected diagram of the dam sand boundary tracking interpretation based on the seismic profile of the connected well analysis is as shown in Figure 5 .

[0080] In some executable embodiments, the dip of the dam sand boundary is determined based on connected wells and three-dimensional integration, and combined with the sediment source direction and wave transformation direction predicted by regional research, the top and bottom of the interpreted dam sand are corrected in the three-dimensional seismic work area. The main direction of the dam sand is generally parallel to the depositional coastline, and the boundary surface inclines towards the sediment source direction and will have a certain angle with the shoreline with the transformation of waves.

[0081] The three-dimensional seismic work area is a region determined according to factors such as underground geological structure, seismic conditions, and surface topography and geomorphology conditions for conducting three-dimensional seismic exploration. Correcting the top and bottom of the interpreted dam sand based on the three-dimensional seismic work area can provide a high-resolution underground geological structure image, helping exploration personnel more accurately determine the location, scale, and shape of hydrocarbon reservoirs, thereby improving the drilling success rate.

[0082] In an executable embodiment, if the dam sand is an overlapping composite dam sand, the top and bottom surfaces of the dam sand are generated according to the dip of the composite dam sand and the erosion points identified by single wells.

[0083] Specifically, through single-well data, the sand body interfaces affected by scouring and erosion are identified. The erosion points usually show sudden changes in sand body thickness or changes in lithology.

[0084] In an executable embodiment, creating the top and bottom surfaces of the dam sand according to the corrected boundary includes:

[0085] Combining the well point boundary positions in the corrected boundary with the thickness of the dam sand drilled in the well (the thickness between the top and bottom of the sand body drilled in the well), creating the top and bottom spatial surfaces of the dam sand ( Figure 3 ).

[0086] Furthermore, the depth of the top surface of the dam sand at the well point can be set as a control point, and the top surface of the dam sand is constructed in three-dimensional space using an interpolation method (such as Kriging interpolation).

[0087] In an executable embodiment, embedding the top and bottom surfaces of the dam sand into the traditional beach sand property model to obtain the beach-bar sand body model includes:

[0088] Assigning the grid corresponding to the top and bottom boundaries of each dam sand body on the existing beach sand property model as the boundary property value.

[0089] Specifically, the grid of the top and bottom boundary surfaces of the dam sand is assigned the boundary property value.

[0090] Assigning the grid inside the top and bottom boundaries of each dam sand body on the beach sand property model as the dam sand property value respectively to obtain the beach-bar sand body model.

[0091] See Figure 6, under the background of beach sand facies, using the top and bottom curved surfaces of the dam sand, the intersection relationship between the two curved surfaces and the model grid is judged by the spatial object intersection algorithm, and corresponding attribute values are set for the intersecting grids, so as to realize the overall embedding of the dam sand into the beach sand background.

[0092] In an executable embodiment, according to different dam sand formation periods, in a preset order, the top and bottom boundaries of each dam sand body and the grids inside the top and bottom boundaries of each dam sand body are assigned values.

[0093] As Figure 6 shown, according to the formation periods of different isolated dam sands, they are embedded in stages from old to new. For the internal boundary curved surfaces of the superimposed composite dam sands, discrete attribute values of the intersecting grids are assigned, and different erosion amounts of the well points are assigned respectively, leaving a controllable space for the sand body fusion degree in the later digital simulation. Finally, a beach-bar facies model is obtained, and other attribute modeling is completed based on this constraint.

[0094] Furthermore, according to the vertical superimposed relationship of different isolated dam sands, their formation periods are judged. First, the old dam sands are embedded, and then they are used as the background facies together with the beach sand. Then, according to the top and bottom interfaces of the new-phase dam sands, the new dam sands are embedded in stages. For the situation where some new sand dams erode the old sand dams, the boundary of the dam sand retains the boundary of the new phase. For some superimposed composite dam sands, internal boundary curved surfaces are generated according to the tendency of the composite dam sand and the erosion points identified by single wells. Finally, discrete attribute values of different levels of boundaries are assigned respectively. Here, according to the configuration boundary levels proposed by Wu Shenghe in 2013, etc., it mainly involves assigning boundary attributes of levels 5-7, and the boundary types are shown in Figure 2 .

[0095] In some scenarios, under the constraints of three discrete attributes of beach sand, dam sand and boundaries (levels 5-7 boundaries), it is used as a traditional facies model, and porosity, permeability and oil saturation attribute modeling are completed under its facies control constraints.

[0096] In the early stage of development, according to the three-dimensional spatial position of the dam sand in the beach-bar sand body model, combined with the distribution areas of high-quality reservoirs with porosity and permeability, the trajectories of development wells are designed to make the trajectories penetrate into the dam sand, penetrate multiple sets of isolated sand dams, and increase the reserve utilization rate.

[0097] The present invention also provides a three-dimensional stereoscopic embedded digital simulation method for isolated dam sands, including:

[0098] Obtain a dam sand model according to any one of the above dam sand modeling methods.

[0099] According to the connectivity between the dam sand boundary and the beach sand in the three-dimensional reservoir model, extract the boundary of the beach-bar sand body model and assign permeability conductivity values.

[0100] Combined with reservoir production data, dynamically correct the attribute values of the boundary.

[0101] Import the corrected attribute values into the reservoir model to obtain an embedded beach-bar reservoir model.

[0102] Based on the understanding of the geological model, analyze the connectivity between the isolated dam sand boundary and the beach sand at each location. Refer to Figure 7 , perform boundary extraction in the 3D reservoir model; then, according to the changes and understanding of the actual production dynamics, continuously and dynamically correct the boundary attributes of the embedded sand body; finally, based on the dynamically optimized sand body boundary attributes, import them into the reservoir model to achieve dynamic fitting prediction of production wells.

[0103] In an executable embodiment, in combination with reservoir production data, dynamically correct the attribute values of the boundary, including:

[0104] Obtain the actual production dynamic data of the production wells corresponding to the reservoir model.

[0105] If the change in the actual production dynamic data is less than or equal to the preset range, modify the attribute values of the boundary.

[0106] Furthermore, if the change in the actual production dynamic data is less than or equal to the preset range, modify the permeability transfer attribute values at the boundary of the dam sand erosion area or at the boundary between the dam sand and the beach sand.

[0107] In an executable embodiment, the actual production dynamic data includes the liquid production per well, water cut increase, and production pressure difference.

[0108] Specifically, the changes in the liquid production per well, water cut increase, and production pressure difference being less than or equal to the preset range represent sufficient production performance and stable pressure.

[0109] Furthermore, by judging the magnitudes of the liquid production per well, water cut increase, and production pressure difference, the size of the reservoir connectivity range can be determined. If the connectivity range is relatively wide, the isolated dam sand boundary has a certain seepage capacity, and it is necessary to adjust the permeability transfer attribute values at the boundary of the dam sand erosion area or at the boundary between the dam sand and the beach sand according to the production dynamic data.

[0110] The above embodiments only represent the preferred implementation modes of the present invention. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent of the present invention; it should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can also be made, which all belong to the protection scope of the present invention; therefore, all equivalent transformations and modifications made to the scope of the claims of the present invention should fall within the scope covered by the claims of the present invention.

Claims

1. A three-dimensional embedded modeling method for isolated dam sand, characterized in that: The following steps are involved: Based on the sedimentary evolution phase diagram of beach-bar facies reservoir and the three-dimensional model diagram of beach-bar facies reservoir sedimentary evolution, the top and bottom boundaries of different isolated bar sand bodies are obtained through the combination of well logging and seismic interpretation; Identifying the boundary trend and shape of each of the different isolated bar sand bodies on the seismic plane attribute map; Interpret the top and bottom boundaries of each sand body in the three-dimensional seismic work area according to the boundary trend and the morphology, ensure that the top and bottom boundary interpretation is three-dimensionally closed, and obtain a three-dimensional closed boundary; Correcting the inclination of the three-dimensional closed boundary interpreted by three-dimensional seismic tracking according to the inclination of the dam sand obtained by well logging and well connection analysis to obtain a corrected boundary; Creating the top and bottom curved surfaces of the dam sand bodies of each of the different isolated dam sand bodies according to the corrected boundaries; The top and bottom curved surfaces of the bar sand are embedded into the traditional property model of the beach sand to obtain the beach-bar sand body model.

2. The isolated dam sand three-dimensional embedded modeling method according to claim 1 is characterized in that: According to the beach-bar facies reservoir sedimentary evolution phase diagram and the beach-bar facies reservoir sedimentary evolution three-dimensional model diagram, the top and bottom boundaries of different isolated bar sand bodies are obtained by combining well logging and seismic interpretation, including: Determining the sedimentary evolution trend of the bar sand based on the sedimentary evolution phase diagram of the beach-bar phase reservoir; According to the three-dimensional model diagram of the sedimentary evolution of the beach-bar phase reservoir, the superposition patterns and combination relationships of different isolated bar sand bodies are obtained, thereby obtaining 5-7 level boundary types; The top and bottom boundaries of different isolated bar sand bodies are three-dimensionally tracked and interpreted in the three-dimensional seismic area by utilizing the sedimentary evolution trend and the boundary type combined with the results of the phase analysis of the isolated bar sand body.

3. The isolated dam sand three-dimensional embedded modeling method according to claim 1 is characterized in that: The method of correcting the inclination of the three-dimensional closed boundary interpreted by seismic tracing according to the bar sand inclination obtained by well logging and well connection analysis to obtain the corrected boundary includes: Determine the dam sand tendency based on the well connection data and the seismic three-dimensional data; Obtaining the sediment source direction from the beach-bar facies reservoir sedimentary evolution phase diagram; The dam sand inclination is combined with the sediment source direction and the wave reconstruction direction to correct the three-dimensional closed boundary to obtain the corrected boundary.

4. The isolated dam sand three-dimensional embedded modeling method according to claim 1 is characterized in that: If the dam sand is a superimposed composite dam sand, the top and bottom curved surfaces of the dam sand are generated according to the composite dam sand inclination and the erosion points identified by a single well.

5. The isolated dam sand three-dimensional embedded modeling method according to claim 1 is characterized in that: The top and bottom surfaces of the dam sand are created according to the correction boundary, including: The well point boundary position in the correction boundary is combined with the thickness of the sand dam drilled on the well to create the top and bottom curved surfaces of the sand dam.

6. The isolated dam sand three-dimensional embedded modeling method according to claim 5 is characterized in that: The top and bottom curved surfaces of the dam sand are embedded into the traditional attribute model of the beach sand to obtain the beach-bar sand body model, including: Assigning the grids corresponding to the top and bottom boundaries of each dam sand body on the traditional beach sand attribute model as boundary attribute values ​​respectively; The beach-bar sand body model is obtained by assigning bar sand attribute values ​​to the grids corresponding to the top and bottom boundaries of each bar sand body on the traditional beach sand attribute model.

7. The isolated dam sand three-dimensional embedded modeling method according to claim 6 is characterized in that: According to different dam sand formation periods, the top and bottom boundaries of each dam sand body and the grids inside the top and bottom boundaries of each dam sand body are assigned values ​​in a preset order.

8. A three-dimensional embedded digital modeling method for isolated dam sand, characterized in that: include: Obtaining a beach-bar sand body model according to the bar-sand modeling method according to any one of claims 1 to 7; According to the connectivity between the bar sand boundary and the beach sand in the three-dimensional reservoir model, the boundary of the beach-bar sand body model is extracted and the permeability conductivity is assigned; Dynamically modifying the attribute value of the boundary in combination with reservoir production data; The corrected attribute values ​​are introduced into the reservoir model to obtain an embedded beach-bar reservoir model.

9. The isolated dam sand three-dimensional embedded digital modeling method according to claim 8, characterized in that: The dynamically correcting the attribute value of the boundary in combination with the reservoir production data includes: Acquiring actual production performance data of production wells corresponding to the reservoir model; If the actual production dynamic data change is less than or equal to the preset range, the attribute value of the boundary is modified.

10. The isolated dam sand three-dimensional embedded digital modeling method according to claim 9, characterized in that: The actual production dynamic data include single well liquid production, water cut rise and production pressure difference.

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