Geologic model establishing method for gas injection development oil reservoirs

Abstract

The invention discloses a geologic model establishing method of a gas injection development oil reservoir, which comprises the following steps: collecting oil reservoir basic data, and establishing abasic database; assigning depth values to the upper and lower fault data of the target interval, and establishing a fault model; generating a three-dimensional skeleton grid; utilizing geological stratification data to establish a layer model; extracting further subdivision of each small layer unit from the reservoir fine division data, determining each rhythm section, forming well point fine description reservoir data, and obtaining a stratum division minimum unit stratum framework model; defining a lithologic value between two rhythm section levels to obtain a reservoir framework model; establishing a sedimentary facies model on the basis of a reservoir framework model, and then establishing a phased reservoir parameter model. The method is used for solving the problem that in the priorart, due to limitation of a geologic model, development optimization adjustment of the gas injection exploitation oil reservoir is delayed, a special geologic model building method is provided for gasinjection exploitation of the oil reservoir, and the purpose of making an overall scheme plan in the earlier stage of development is facilitated.

Description

technical field [0001] The invention relates to the field of oil and gas development, in particular to a method for establishing a geological model of a gas injection development reservoir. Background technique [0002] Establishing a reliable reservoir numerical model is the basis of reservoir numerical simulation. The foundation is reliable, the history matching degree is high, and the speed is fast, thereby shortening the research cycle and improving work efficiency. The establishment of reservoir numerical model includes two parts: geological model and dynamic model. [0003] In gas injection projects, due to the different physical properties of the injection medium, its oil displacement mechanism is also different. For block fracture systems with faults, the distribution of faults and rhythmic segments (or single sand bodies) is greatly affected during the gas injection production process, and the distribution of gas injection wells and gas injection design need to ful...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a geological model establishment method for gas injection development reservoirs, to solve the problem that the development optimization and adjustment of gas injection production reservoirs is lagging behind due to the limitations of geological models in the prior art, and to realize the development of gas injection development reservoirs. The special geological model building method is conducive to the purpose of doing a good job in the overall program planning in the early stage of development

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