A method for modeling natural fractures in tight sandstone reservoirs

Abstract

The present invention is a modeling method for natural fractures in tight sandstone reservoirs, which includes the following steps: 1) identifying single well fractures and the internal structure of fault fracture zones; 2) based on sedimentary facies control and fracture seismic interpretation, using deterministic and A modeling method that combines a variety of stochastic algorithms to establish a matrix geological model under lithofacies-structure coupling; 3) Under the constraints of the lithofacies-structure coupling matrix geology model, sequential indicator simulation is used combined with the trend construction of vertical probability bodies. Establish a three-dimensional non-uniform rock mechanics model using the modeling method; 4) Perform finite element numerical simulation on the three-dimensional non-uniform rock mechanics model to obtain a three-dimensional spatial stress field model; 5) By establishing the relationship between the stress field and fracture parameters, use the discrete fracture network to build The crack model is established using the mold method. The invention can accurately describe the spatial distribution of natural fractures in the underground and can be widely used in the field of unconventional reservoir fracture modeling.

Description

technical field [0001] The invention relates to the field of characterization and modeling of unconventional reservoirs, and is a modeling method for natural fractures in tight sandstone reservoirs. Background technique [0002] In tight sandstone reservoirs, the pore-throat radius is small and the pore space is limited, so natural fractures become channels and places for oil and gas migration and storage in such unconventional reservoirs. Therefore, clarifying the spatial distribution of natural fractures in underground reservoirs is the core content. Modeling natural fractures is the most three-dimensional and intuitive means to display the spatial distribution of natural fractures. Model. Natural fracture modeling has always been a difficult problem in the world. Up to now, the identification and modeling of underground natural fractures through geophysical means is the most direct method. However, due to the multi-scale problem of fractures, modeling from geophysical m...

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Problems solved by technology

[0004] In the traditional continuous attribute modeling process, it is often based on the sequential Gaussian simulation algorithm under the control of sedimentary facies, which has the problems of excessive control range of facies boundary conditions and low vertical resolution

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