CN-121998463-A - Evaluation method for acquiring contribution of shale oil artificial fracture and stratum energy to recovery ratio

CN121998463ACN 121998463 ACN121998463 ACN 121998463ACN-121998463-A

Abstract

The invention belongs to the technical field of oil and gas exploitation, and relates to an evaluation method for acquiring shale oil artificial cracks and stratum energy contribution to recovery ratio. According to the method, an artificial crack is loaded in a three-dimensional fine reservoir geological model containing natural cracks, and the diversion capacity of the artificial crack is assigned, so that a matrix-crack model is obtained, a first single-well yield is obtained according to the matrix-crack model, the elastic energy of fracturing fluid is assigned to the matrix-crack model, a second single-well yield is obtained, the elastic energy of reservoir fluid is assigned to the matrix-crack model with the elastic energy of the fracturing fluid assigned to the matrix-crack model, a third single-well yield is obtained, the elastic energy of reservoir rock is assigned to the matrix-crack model with the elastic energy of the reservoir fluid assigned to the reservoir rock, a fourth single-well yield is obtained, and finally, the first single-well yield, the second single-well yield, the third single-well yield and the fourth single-well yield of different production times are obtained, and the contribution of the artificial crack and the stratum energy to the shale oil yield and the final recovery rate are obtained.

Inventors

XUE TING
WANG GAOQIANG
ZHANG CHAO
GUAN YUN
MA SHUWEI
MA SHENGHUI
ZHANG XUZE
YANG QINCHUAN
YAN RUI
HU SHIHAO
LI JIANTING
FAN JIANMING
LEI QIHONG
QU XUEFENG
WANG BO
HE YOUAN
SUN HUALING
FENG LIYONG

Assignees

中国石油天然气股份有限公司

Dates

Publication Date: 20260508
Application Date: 20241104

Claims (10)

1. The evaluation method for acquiring the contribution of the shale oil artificial fracture and the stratum energy to the recovery ratio is characterized by comprising the following steps: constructing a shale oil platform three-dimensional fine reservoir geological model; constructing a three-dimensional fine reservoir geological model containing natural cracks according to the three-dimensional fine reservoir geological model; Loading artificial cracks in a three-dimensional fine reservoir geological model containing natural cracks, carrying out assignment on the diversion capacity of the artificial cracks to obtain a matrix-crack model, and obtaining the first single well yield according to the matrix-crack model; performing fracturing fluid elasticity assignment on the matrix-fracture model, and acquiring a second single well yield according to the matrix-fracture model with the fracturing fluid elasticity assigned; assigning the reservoir fluid elasticity to the matrix-fracture model after assigning the fracturing fluid elasticity, and acquiring a third single well yield according to the matrix-fracture model after assigning the reservoir fluid elasticity; assigning the reservoir rock elasticity to the matrix-fracture model after assigning the reservoir rock elasticity, and acquiring a fourth single well yield according to the matrix-fracture model after assigning the reservoir rock elasticity; and acquiring the first single well yield, the second single well yield, the third single well yield and the fourth single well yield of different production times, and acquiring the contribution of the artificial fracture and the stratum energy to the shale oil yield and the final recovery ratio according to the first single well yield, the second single well yield, the third single well yield and the fourth single well yield of different production times.
2. The method for evaluating the contribution of the artificial shale oil fracture and the stratum energy to the recovery ratio, which is disclosed by claim 1, is characterized by constructing a shale oil platform three-dimensional fine reservoir geological model, and is specifically as follows: and constructing a shale oil platform three-dimensional fine reservoir geological model according to Shan Jingce well interpretation data, single well fine layering data, three-dimensional seismic data volumes, logging data and single well actual track profile data.
3. The method for evaluating the contribution of the artificial shale oil fracture and the stratum energy to the recovery ratio according to claim 2, wherein the method is characterized in that a three-dimensional fine reservoir geological model of a shale oil platform is constructed according to Shan Jingce well interpretation data, single well fine stratification data, three-dimensional seismic data volumes, logging data and single well actual track profile data, and is specifically as follows: Utilizing single well fine layering data, under the constraint of a three-dimensional seismic data body, combining three-dimensional seismic interwell construction interpretation and single well real drilling track data, establishing a virtual well, fine constraint interwell construction trend, and establishing a three-dimensional construction model by using a corner method; On the basis of a three-dimensional structural model, a three-dimensional lithofacies model is established by using single well logging interpretation data, logging data and a three-dimensional seismic data volume as constraint conditions and adopting a seismic constraint and random modeling method; establishing a three-dimensional attribute model on the basis of a three-dimensional lithofacies model, wherein the three-dimensional attribute model is based on lithology iteration constraint attribute modeling in the establishment process, a argillaceous content model and a porosity model are constrained through a natural gamma model, and a permeability model and a saturation model are constrained through the porosity model; based on the actual track profile data of the single horizontal well, the three-dimensional structure model, the three-dimensional lithofacies model and the three-dimensional attribute model are subjected to iterative constraint adjustment by utilizing a local variation function, a virtual well and experience knowledge, and the three-dimensional fine reservoir geological model of the shale oil platform is obtained.
4. The method for evaluating the contribution of the artificial fracture and the stratum energy of the shale oil to the recovery ratio, which is characterized by comprising the following steps of: And establishing a three-dimensional fine reservoir geological model containing natural cracks according to the three-dimensional fine reservoir geological model in combination with imaging logging data, core observation data, three-dimensional seismic ants, variances and curvature attributes.
5. The method for evaluating the contribution of the artificial shale oil fracture and the stratum energy to the recovery ratio according to claim 4, wherein the method is characterized in that a three-dimensional fine reservoir geological model containing natural fractures is established according to the three-dimensional fine reservoir geological model in combination with imaging logging data, core observation data, three-dimensional seismic ants, variances and curvature attributes, and is specifically as follows: acquiring imaging logging data, core observation data, a three-dimensional seismic ant body, a variance body and curvature attributes; analyzing the development characteristics of the middle-large scale natural cracks in the three-dimensional fine reservoir geological model through the three-dimensional seismic ant body, the variance body and the curvature attribute, extracting crack pieces, and carrying out middle-large scale crack modeling according to the crack pieces by adopting a deterministic method to obtain the middle-large scale natural crack-containing three-dimensional fine reservoir geological model; Establishing a small-scale fracture density curve based on imaging logging data and core observation data, and carrying out small-scale fracture modeling in a three-dimensional fine reservoir geological model by combining the small-scale fracture density curve by adopting a random method under the action of three-dimensional seismic constraint to obtain the three-dimensional fine reservoir geological model containing natural fractures.
6. The method for evaluating the contribution of the artificial shale oil fracture and the stratum energy to the recovery ratio according to claim 1, wherein the artificial fracture is loaded in a three-dimensional fine reservoir geological model containing natural fractures, and the artificial fracture conductivity is assigned to obtain a matrix-fracture model, and the first single well yield is obtained according to the matrix-fracture model, specifically as follows: Simulating artificial fracture network distribution by combining shale oil horizontal well fracturing construction parameters and underground microseism fracture monitoring data, loading artificial fractures in a three-dimensional fine reservoir geological model containing natural fractures, and constructing a matrix-fracture model containing the diversion capacity of the artificial fractures; and simulating and acquiring the first single well yield under the condition of the artificial fracture conductivity at different times according to the matrix-fracture model.
7. The method for evaluating the contribution of the artificial fracture and the formation energy to the recovery ratio, which is characterized in that the contribution of the artificial fracture and the formation energy to the shale oil yield and the final recovery ratio is obtained according to the first single well yield, the second single well yield, the third single well yield and the fourth single well yield which are obtained at different production times, wherein the contribution of the artificial fracture and the formation energy to the shale oil yield and the final recovery ratio is obtained according to the first single well yield, the second single well yield, the third single well yield and the fourth single well yield which are obtained at different production times, and is specifically as follows: acquiring the contribution rate of the artificial fracture conductivity to the yield according to the first single well yield and the fourth single well yield; acquiring the contribution rate of the elastic energy of the fracturing fluid to the yield according to the first single well yield, the second single well yield and the fourth single well yield; Acquiring the contribution rate of reservoir fluid elastic energy to the yield according to the second single well yield, the third single well yield and the fourth single well yield; acquiring the contribution rate of the reservoir rock elastic energy to the yield according to the third single well yield and the fourth single well yield; acquiring a first single well yield, a second single well yield, a third single well yield and a fourth single well yield for several years; Acquiring the contribution rate of the artificial fracture conductivity to the final recovery ratio according to the first single well yield and the fourth single well yield for several years; Acquiring the contribution rate of the elastic energy of the fracturing fluid to the final recovery ratio according to the first single well yield, the second single well yield and the fourth single well yield for a plurality of years; Acquiring the contribution rate of reservoir fluid elastic energy to final recovery ratio according to the second single well yield, the third single well yield and the fourth single well yield for several years; and obtaining the contribution rate of the reservoir rock elastic energy to the final recovery ratio according to the third single well yield and the fourth single well yield for a plurality of years.
8. An evaluation system for acquiring the contribution of shale oil artificial fractures and stratum energy to recovery efficiency, which is characterized by comprising: The three-dimensional fine reservoir geological model construction module is used for constructing a shale oil platform three-dimensional fine reservoir geological model; the natural fracture distribution model construction module is used for constructing a three-dimensional fine reservoir geological model containing natural fractures according to the three-dimensional fine reservoir geological model; the first single well yield acquisition module is used for loading artificial cracks in a three-dimensional fine reservoir geological model containing natural cracks, carrying out artificial crack diversion capacity assignment to obtain a matrix-crack model, and acquiring the first single well yield according to the matrix-crack model; The second single well yield acquisition module is used for carrying out fracturing fluid elasticity assignment on the matrix-fracture model and acquiring the second single well yield according to the matrix-fracture model with the fracturing fluid elasticity assigned; the third single well yield acquisition module is used for carrying out the assignment of reservoir fluid elasticity energy on the matrix-fracture model after the assignment of the fracturing fluid elasticity energy, and acquiring the third single well yield according to the matrix-fracture model after the assignment of the reservoir fluid elasticity energy; The fourth single well yield acquisition module is used for carrying out reservoir rock elasticity assignment on the matrix-fracture model after reservoir rock elasticity assignment, and acquiring fourth single well yield according to the matrix-fracture model after reservoir rock elasticity assignment; And the contribution rate acquisition module is used for acquiring the first single well yield, the second single well yield, the third single well yield and the fourth single well yield of different production times, and acquiring the contribution of the artificial fracture and the stratum energy to the shale oil yield and the final recovery rate according to the first single well yield, the second single well yield, the third single well yield and the fourth single well yield of different production times.
9. An electronic device comprising a processor, a memory, the electronic device storing computer program instructions, characterized by implementing the steps of the method for acquiring artificial fractures of shale oil and evaluating the contribution of formation energy to recovery efficiency according to any one of claims 1-7 when executing the computer program.
10. A storage medium storing computer program instructions which, when loaded and executed by a processor, performs the method of evaluating the contribution of the artificial shale oil fracture and formation energy to recovery of any of claims 1-7.

Description

Evaluation method for acquiring contribution of shale oil artificial fracture and stratum energy to recovery ratio Technical Field The invention belongs to the technical field of oil and gas exploitation, and relates to an evaluation method for acquiring shale oil artificial cracks and stratum energy contribution to recovery ratio. Background The failure type development mechanism after the shale oil volume fracturing transformation is greatly different from that of a conventional oil reservoir, on one hand, an SRV control area after the fracturing transformation is a main oil drainage range of shale oil, under the condition that the original geological oil reservoir parameters of the shale oil reservoir are unchanged, a crack can effectively enlarge the imbibition contact area of a matrix and water, the seepage resistance is reduced, the artificial crack diversion capability has a certain contribution to the recovery ratio, and on the other hand, the stratum elastic energy in the failure type development process after the shale oil pressure is main energy, and the stratum elastic energy comprises three elastic energy of fracturing fluid elastic energy, reservoir fluid elastic energy and reservoir rock elastic energy, and has an important contribution to the recovery ratio. The quantitative contribution of the different factors to the yield and the recovery ratio in different production time periods is clarified, and technical support is provided for pertinently optimizing the reduction of the shale oil production technical policy, improving the recovery ratio and the later energy supplementing, so that the shale oil development effect is improved. However, the quantitative contribution of the artificial shale oil fracture and the elastic energy of different stratum to the recovery ratio is not systematically researched and evaluated at present, firstly, the contribution of the diversion capacity of the artificial fracture to the recovery ratio is not considered, secondly, the elastic energy of the increase of the external fluid fracturing fluid after the volume fracturing is not considered, the part of energy is mainly concentrated in a near-well fracturing transformation area, thirdly, the influence of the dissolved gas-oil ratio is not fully considered in the elastic energy of the reservoir fluid, and thirdly, the contribution of the different factors to the yield and the final recovery ratio is not evaluated at different production times. For example, the invention patent with publication number of CN112814669A discloses a method and a system for predicting the recovery ratio of the full life cycle of a shale oil reservoir, and discloses a model for predicting the recovery ratio of elastic flooding and dissolved gas flooding in the shale oil failure type development process based on a substance balance principle. In summary, the prior art has the following drawbacks: 1. The contribution of the artificial fracture conductivity to the recovery ratio is not considered; 2. The increased elastic energy of the fracturing fluid of the external fluid after volumetric fracturing is not considered; 3. The different types of elastic energy are not distinguished and quantitatively characterized; 4. the contribution of the different factors to the production and final recovery at different production times was not evaluated. Disclosure of Invention In order to overcome the defects of the prior art, the invention aims to provide an evaluation method for acquiring the contribution of the artificial fracture and the formation energy of shale oil to the recovery ratio, and quantitatively evaluating the influence of the flow conductivity of the artificial cracks, the elastic energy of fracturing fluid, the elastic energy of reservoir fluid and the contribution of the elastic energy of reservoir rock to the yield and the final recovery ratio at different production times, and providing an important basis for subsequent exploitation strategies and optimization. In order to achieve the above purpose, the invention is realized by adopting the following technical scheme: In a first aspect, the invention provides an evaluation method for acquiring the contribution of shale oil artificial fractures and stratum energy to recovery efficiency, comprising the following steps: constructing a shale oil platform three-dimensional fine reservoir geological model; constructing a three-dimensional fine reservoir geological model containing natural cracks according to the three-dimensional fine reservoir geological model; Loading artificial cracks in a three-dimensional fine reservoir geological model containing natural cracks, carrying out assignment on the diversion capacity of the artificial cracks to obtain a matrix-crack model, and obtaining the first single well yield according to the matrix-crack model; performing fracturing fluid elasticity assignment on the matrix-fracture model, and acquiring a second single well yield according