Reservoir transformation horizon selection method for finding holes along seams

Abstract

The invention relates to a reservoir transformation horizon selection method for finding holes along seams. The method comprises the following steps: step 1, collecting existing single well logging information, seismic data information and related early-stage construction production information of a fracture-vug type oil reservoir; 2, quantitatively knowing distribution characteristics of cracks and karst caves in a block range by adopting a statistical analysis method, comparing the distribution characteristics with early-stage construction production materials, and correcting an area with relatively large deviation to obtain a statistical analysis result; 3, in combination with the statistical analysis result and the seismic data information, constructing a fracture-cavity distribution three-dimensional geological model in geological modeling software, and performing single well stress field calculation and checking; and 4, simulating and forming a shaft-crack-karst cave connection network in AiFrac fracturing simulation software by adopting the three-dimensional geologic model, screening out the horizon with relatively developed main and branch cracks or natural cracks in the stratum after acid fracturing, and finally selecting the horizon for reservoir transformation by taking the goal that the acid fracturing cracks are communicated with the karst cave reservoir body to the greatest extent.

Description

technical field [0001] The invention relates to the technical field of development of fracture-cavity oil reservoirs, in particular to a method for selecting layers for reservoir reconstruction by finding holes along fractures. Background technique [0002] Carbonate fracture-cavity reservoirs are widely distributed at home and abroad, and have abundant reserves. However, due to their special type, not only the lithology is tight, the matrix contains no oil, and pores, fractures and caves are developed, but also the spatial combination of the main oil and gas reservoirs is complicated. Variety and scale. Development practice has proved that the main storage and production units of fractured-vuggy reservoirs are composed of fractured-vuggy units with different quantities and reserves. [0003] Existing methods for layer selection for reservoir stimulation are generally used in coalbed methane wells or shale. For example, the invention patent with application number 201711447...

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Problems solved by technology

[0003] Existing methods for layer selection for reservoir stimulation are generally used in coalbed methane wells or shale. For example, the invention patent with application number 201711447492.9 discloses a method for selecting fracturing layers in coalbed methane wells. The invention patent with application number 201811194735.7 discloses A method for selecting fracturable layers of mudstone in tight oil horizontal wells. The technologies proposed in the above two invention patents do not involve the efficient communication of natural fractures and karst cave reservoirs that fracture-cavity reservoirs rely on, so they are not applicable Reservoir Stimulation Horizon Selection in Fractured-vuggy Reservoirs

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