CN-120338171-B - Dual dessert prediction method and prediction device for geological reservoir

CN120338171BCN 120338171 BCN120338171 BCN 120338171BCN-120338171-B

Abstract

The embodiment of the application provides a dual dessert prediction method and a dual dessert prediction device for a geological reservoir, wherein the method comprises the steps of obtaining a plurality of areas to be analyzed according to dual dessert index three-dimensional distribution information of a target reservoir, obtaining fracturing crack expansion simulation results corresponding to the areas to be analyzed, obtaining all the dual dessert areas according to the distribution information of an aquifer and the distribution information of a thin interlayer in the three-dimensional geological model of the target reservoir based on an established three-dimensional geological model of the target reservoir, marking the areas to be analyzed as dual dessert areas after determining that fracturing cracks of the areas to be analyzed cannot communicate with the aquifer and can pass through the thin interlayer, and traversing the areas to be analyzed of the target reservoir to complete dual dessert prediction of the target reservoir. According to the method, the distribution information of the complex geologic structure of the aquifer and the thin interlayer and the crack propagation characteristic are considered at the same time, so that the accuracy of predicting the double dessert areas is improved, and the economy of reservoir development is improved.

Inventors

ZHANG ZHAOPENG
ZHU HAIYAN
YI DONG
GONG DING
TAO LEI

Assignees

成都理工大学

Dates

Publication Date: 20260508
Application Date: 20250326

Claims (8)

1. A method of dual dessert prediction for a geological reservoir, comprising: acquiring a plurality of areas to be analyzed according to the double dessert index three-dimensional distribution information of a target reservoir, and acquiring a fracturing crack expansion simulation result corresponding to the areas to be analyzed, wherein the fracturing crack expansion simulation result is crack distribution information, which is obtained through simulation, of the areas to be analyzed and is generated by construction; Based on the established three-dimensional geological model of the target reservoir, judging whether the fracturing cracks of the region to be analyzed can communicate with the aquifer or not according to the distribution information of the aquifer in the three-dimensional geological model of the target reservoir and through the fracturing crack expansion simulation result corresponding to the region to be analyzed, and/or, Based on an established target reservoir three-dimensional geological model, judging whether a fracturing crack of the to-be-analyzed area can pass through the thin interlayer according to the distribution information of the thin interlayer in the target reservoir three-dimensional geological model and through a fracturing crack expansion simulation result corresponding to the to-be-analyzed area; Marking the area to be analyzed as a dual dessert area after determining that the fracture crack of the area to be analyzed does not communicate with the aquifer and can pass through the thin interlayer; Traversing a plurality of areas to be analyzed of the target reservoir to obtain all the dual dessert areas so as to complete dual dessert prediction of the target reservoir; The method further comprises the steps of: Acquiring stratum physical parameters and rock mechanical parameters of the target reservoir according to the established three-dimensional geological model of the target reservoir and the three-dimensional geomechanical model of the target reservoir; the stratum physical parameters comprise at least one of porosity, total hydrocarbon content, water saturation, permeability or stratum pressure coefficient, and the rock mechanical parameters comprise at least one of brittle mineral content, young modulus, poisson's ratio, weak surface approach angle or ground stress; Acquiring geological dessert index three-dimensional distribution information of the target reservoir according to at least one of the porosity, the total hydrocarbon content, the water saturation, the permeability or the formation pressure coefficient; Acquiring engineering dessert index three-dimensional distribution information of the target reservoir according to at least one of the brittle mineral content, young modulus, poisson ratio, weak surface approach angle or ground stress; according to the three-dimensional distribution information of the geological dessert index and the three-dimensional distribution information of the engineering dessert index, screening and obtaining the geological dessert index and the engineering dessert index belonging to the same area position; Acquiring a preset geological dessert correction factor and an engineering dessert correction factor, and acquiring a double dessert index of the region position according to the geological dessert index and the engineering dessert index belonging to the same region position and the geological dessert correction factor and the engineering dessert correction factor; According to the geological dessert index F G and the engineering dessert index F E which belong to the same region position and according to the geological dessert correction factor a and the engineering dessert correction factor b, adopting the formula: calculating and acquiring a dual dessert index D of the region position, wherein max (F G ) is the maximum geological dessert index in the target reservoir, and max (F E ) is the maximum engineering dessert index in the target reservoir; Traversing all areas of the target reservoir, and acquiring the dual dessert indexes of all areas to acquire the three-dimensional distribution information of the dual dessert indexes of the target reservoir.
2. The method of claim 1, wherein the obtaining the fracture propagation simulation results corresponding to the region to be analyzed comprises: acquiring a hydraulic fracture propagation finite element model corresponding to the area to be analyzed; Simulating a simulated fracture generated in the to-be-analyzed area during construction by adopting the hydraulic fracture expansion finite element model according to actual fracture construction information, and acquiring a first fracture expansion simulation result corresponding to the to-be-analyzed area according to distribution information of the simulated fracture; Acquiring a fracture height expansion finite element model of the fracturing fracture corresponding to the area to be analyzed; Simulating a simulated fracture generated in the to-be-analyzed area during construction by adopting a fracture crack height expansion finite element model according to the actual fracture construction information, and acquiring distribution information of a plurality of simulated fracture cracks by setting a plurality of simulation distance values of a starting point and a thin interlayer and setting a plurality of thin interlayer simulation thicknesses so as to acquire a second fracture crack expansion simulation result corresponding to the to-be-analyzed area; the fracturing crack high expansion finite element model adopts a thin interlayer-reservoir-thin interlayer interbedded structure mode.
3. The method of claim 2, wherein the obtaining a hydraulic fracture propagation finite element model corresponding to the region to be analyzed comprises: acquiring the double dessert index of the region to be analyzed according to the three-dimensional distribution information of the double dessert index of the target reservoir, and acquiring the region type of the region to be analyzed according to the double dessert index; Screening and acquiring one or more areas to be analyzed belonging to the same area type based on a plurality of areas to be analyzed in the target reservoir; And acquiring stratum physical parameters and rock mechanical parameters of the one or more areas to be analyzed, and constructing a hydraulic fracture expansion finite element model according to the stratum physical parameters and the rock mechanical parameters so as to acquire the hydraulic fracture expansion finite element model.
4. The method of claim 2, wherein the obtaining a fracture height expansion finite element model corresponding to the region to be analyzed comprises: acquiring the double dessert index of the region to be analyzed according to the three-dimensional distribution information of the double dessert index of the target reservoir, and acquiring the region type of the region to be analyzed according to the double dessert index; Screening and acquiring one or more areas to be analyzed belonging to the same area type based on a plurality of areas to be analyzed in the target reservoir; acquiring stratum physical parameters and rock mechanical parameters of the one or more areas to be analyzed, and acquiring stratum physical parameters and rock mechanical parameters of the thin interlayer; And constructing the fracture crack high expansion finite element model according to the stratum physical parameters and the rock mechanical parameters of the one or more areas to be analyzed and according to the stratum physical parameters and the rock mechanical parameters of the thin interlayer by adopting a preset interbedded structure form of the thin interlayer-reservoir-thin interlayer so as to obtain the fracture crack high expansion finite element model.
5. The method according to claim 2, wherein based on the established three-dimensional geological model of the target reservoir, determining whether the fracture of the region to be analyzed will communicate with the aquifer according to the distribution information of the aquifer in the three-dimensional geological model of the target reservoir and by the fracture propagation simulation result corresponding to the region to be analyzed, comprises: Acquiring the distribution information of an aquifer in the three-dimensional geological model of the target reservoir according to the established three-dimensional geological model of the target reservoir; Acquiring the transverse distance and the longitudinal distance between the central cracking point of the area to be analyzed and the boundary of the aquifer according to the three-dimensional position information of the area to be analyzed and the distribution information of the aquifer; According to the first fracture crack expansion simulation result, obtaining the simulated fracture length and the simulated fracture height of the region to be analyzed; If the transverse distance is greater than or equal to one half of the simulated fracture length and the longitudinal distance is greater than or equal to one half of the simulated fracture height, confirming that the fracture of the area to be analyzed does not communicate with the aquifer; and if the transverse distance is less than one half of the simulated fracture length and/or the longitudinal distance is less than one half of the simulated fracture height, confirming that the fracture of the area to be analyzed is communicated with the aquifer.
6. The method according to claim 2, wherein the determining, based on the established three-dimensional geological model of the target reservoir, whether the fracture of the area to be analyzed can pass through the thin interlayer according to the distribution information of the thin interlayer in the three-dimensional geological model of the target reservoir by the fracture propagation simulation result corresponding to the area to be analyzed includes: According to the established three-dimensional geological model of the target reservoir, acquiring the distribution information of a thin interlayer in the three-dimensional geological model of the target reservoir; According to the three-dimensional position information of the area to be analyzed and the distribution information of the thin interlayer, the longitudinal distance between the central cracking point of the area to be analyzed and the boundary of the thin interlayer is obtained, and the actual thickness of the thin interlayer is obtained; According to the second fracturing crack expansion simulation result, obtaining the corresponding relation among the simulation distance value, the simulation thickness and the simulation fracturing crack so as to obtain a crossing condition of crossing a thin interlayer; if the actual thickness of the thin interlayer and the longitudinal distance between the central cracking point of the area to be analyzed and the boundary of the thin interlayer meet the crossing condition, confirming that the fracturing crack of the area to be analyzed can cross the thin interlayer; And if the actual thickness of the thin interlayer and the longitudinal distance between the central cracking point of the area to be analyzed and the boundary of the thin interlayer do not meet the crossing condition, confirming that the fracturing crack of the area to be analyzed cannot cross the thin interlayer.
7. The method according to claim 1, wherein the method further comprises: Marking the area to be analyzed as a risk area after determining that the fracture crack of the area to be analyzed does not communicate with the aquifer and cannot pass through the thin interlayer, or Marking the area to be analyzed as a risk area after determining that the fracture of the area to be analyzed will communicate with the water-bearing layer and can pass through the thin interlayer, or After determining that the fracture of the area to be analyzed can communicate with the aquifer and cannot pass through the thin interlayer, marking the area to be analyzed as a risk area.
8. A dual dessert prediction device for a geological reservoir, comprising: The system comprises an acquisition module, a target reservoir, a target analysis module and a control module, wherein the acquisition module is used for acquiring a plurality of areas to be analyzed according to the double dessert index three-dimensional distribution information of the target reservoir, and acquiring a fracturing crack expansion simulation result corresponding to the areas to be analyzed, wherein the fracturing crack expansion simulation result is crack distribution information of the areas to be analyzed, which is obtained through simulation and is generated by construction; The first judging module is used for judging whether the fracturing cracks of the to-be-analyzed area can communicate with the aquifer or not according to the distribution information of the aquifer in the target reservoir three-dimensional geological model and the fracturing crack expansion simulation result corresponding to the to-be-analyzed area based on the established target reservoir three-dimensional geological model and/or The second judging module is used for judging whether the fracturing cracks of the to-be-analyzed area can pass through the thin interlayer according to the distribution information of the thin interlayer in the target reservoir three-dimensional geological model and the fracturing crack expansion simulation result corresponding to the to-be-analyzed area based on the established target reservoir three-dimensional geological model; the marking module is used for marking the area to be analyzed as a dual dessert area after the fact that the fracturing fracture of the area to be analyzed does not communicate with the water-bearing layer and can pass through the thin interlayer is determined; the result output module is used for traversing a plurality of areas to be analyzed of the target reservoir to obtain all the dual dessert areas so as to complete dual dessert prediction of the target reservoir; The acquisition module is also used for acquiring stratum physical parameters and rock mechanical parameters of the target reservoir according to the established three-dimensional geological model of the target reservoir and the three-dimensional geomechanical model of the target reservoir; the stratum physical parameters comprise at least one of porosity, total hydrocarbon content, water saturation, permeability or stratum pressure coefficient, the rock mechanical parameters comprise at least one of brittle mineral content, young modulus, poisson ratio, weak surface approach angle or ground stress, the preset geological dessert index and engineering dessert index are obtained according to the at least one of porosity, total hydrocarbon content, water saturation, permeability or stratum pressure coefficient, the geological dessert index three-dimensional distribution information of the target reservoir is obtained according to the at least one of brittle mineral content, young modulus, poisson ratio, weak surface approach angle or ground stress, the engineering dessert index three-dimensional distribution information of the target reservoir is obtained according to the at least one of brittle mineral content, young modulus, poisson ratio, weak surface approach angle or ground stress, the geological dessert index three-dimensional distribution information and the engineering dessert index three-dimensional distribution information of the target reservoir are screened to obtain geological dessert index and engineering dessert index belonging to the same region position, the preset geological dessert correction factor and engineering dessert index are obtained according to the geological dessert index correction factor and engineering dessert index belonging to the same region position, the dessert index and the dessert factor F5326 is obtained according to the geological correction factor and the engineering dessert factor, the two-region dessert index and the dessert index F5326 belongs to the same region position and the dessert index F5326 is obtained according to the same region position: Calculating and acquiring the double dessert index D of the region position, wherein max (F G ) is the maximum geological dessert index in the target reservoir, max (F E ) is the maximum engineering dessert index in the target reservoir, traversing all regions of the target reservoir, and acquiring the double dessert index of all regions to acquire the double dessert index three-dimensional distribution information of the target reservoir.

Description

Dual dessert prediction method and prediction device for geological reservoir Technical Field The application relates to the technical field of geological reservoir exploration, in particular to a dual dessert prediction method and a dual dessert prediction device for geological reservoirs. Background In the exploration and development of oil and gas resources, the identification and effective development of a quality area of a reservoir are key parts for determining development efficiency and economic benefit. In order to determine quality areas within a reservoir, it is often necessary to conduct a comprehensive analysis of the geological features and engineering remodelling of the reservoir. The dual dessert area is always an important target area for oil and gas development as a high-quality area with good reservoir characteristics and fracturing transformation potential in a reservoir. By identifying and defining these dual dessert areas, the success rate and economic benefits of hydrocarbon development can be improved. In the prior art, the prediction of the dual dessert region mainly comprises the steps of analyzing the geological characteristics and fracturing modification characteristics of a reservoir, namely, comprehensively analyzing geological parameters and engineering parameters of the reservoir to obtain a region with better reservoir performance, oil and gas containing performance and better modification potential, so as to determine a high-yield potential region in the reservoir, namely, a 'dual dessert' region. In terms of geologic parameters, it is common to choose important parameters that reflect reservoir properties and oil/gas properties of a reservoir, such as porosity, permeability, oil/gas saturation, etc. Through normalization processing and weighted calculation of these parameters, a geologic dessert index is formed for evaluating reservoir and hydrocarbon-bearing properties. In terms of engineering parameters, parameters related to reservoir reformation performance are selected, and mainly comprise brittle mineral content, young modulus, poisson's ratio and the like. By analytical calculation of these parameters, an engineered dessert index was developed for evaluating reservoir fracturing engineering potential. The geological and engineered dessert indices are then integrated to form a dual dessert index. The higher the number of the dual dessert index, the better the zone performs in terms of reservoir performance, oil and gas properties, and fracture remodelling potential. Although the prior art can predict a potential high-yield area to a certain extent, because the analysis is mainly based on static parameters, the influence of geologic structures such as aquifers, thin interlayers and the like in a reservoir on the expansion of fracturing cracks is not fully considered, and the accuracy of a prediction result in actual development may be reduced. Based on this, there is a need for a dual dessert prediction method for geological reservoirs to solve the problem of low accuracy of dual dessert prediction in the prior art. Disclosure of Invention The embodiment of the application provides a dual dessert prediction method and a dual dessert prediction device for a geological reservoir, which are used for improving the accuracy of dual dessert prediction in the geological reservoir. In a first aspect, an embodiment of the present application provides a dual dessert prediction method for a geological reservoir, including: acquiring a plurality of areas to be analyzed according to the double dessert index three-dimensional distribution information of a target reservoir, and acquiring a fracturing crack expansion simulation result corresponding to the areas to be analyzed, wherein the fracturing crack expansion simulation result is crack distribution information, which is obtained through simulation, of the areas to be analyzed and is generated by construction; based on the established three-dimensional geological model of the target reservoir, judging whether the fracturing cracks of the region to be analyzed can communicate with the aquifer according to the distribution information of the aquifer in the three-dimensional geological model of the target reservoir and through the fracturing crack expansion simulation result corresponding to the region to be analyzed, and/or, Based on an established target reservoir three-dimensional geological model, judging whether a fracturing crack of the to-be-analyzed area can pass through the thin interlayer according to the distribution information of the thin interlayer in the target reservoir three-dimensional geological model and through a fracturing crack expansion simulation result corresponding to the to-be-analyzed area; Marking the area to be analyzed as a dual dessert area after determining that the fracture crack of the area to be analyzed does not communicate with the aquifer and can pass through the thin interlayer; and traversin