Sub-seismic fault quantitative prediction method

Abstract

The invention relates to a sub-seismic fault quantitative prediction method, which comprises the steps of constructing and drawing a balance section, analyzing the deformation periods of faults, analyzing the deformation mechanisms of the faults, determining the fault evolution law, dividing a fault system, establishing a fault fractal growth model, establishing a power law relationship between the fault length and the cumulative frequency, establishing the relationship between the fault length and the maximal fault displacement, predicting the extending lengths of sub-seismic faults, the maximal fault displacements of the sub-seismic faults and the number of the sub-seismic faults, finely explaining the faults and the stratum, calculating the fault displacements of each fault plane, establishing a three-dimensional geologic model, establishing a three-dimensional mechanical model, establishing a grid layout between the fracture orientation and the fracture density, and determining the development positions and the development orientations of the sub-seismic faults based on stochastic simulation techniques with the extending lengths of sub-seismic faults, the maximal fault displacements of the sub-seismic faults, the number of the sub-seismic faults, the fracture orientation and the density grid determined on the basis of the three-dimensional geomechanical simulation as constraint conditions. According to the technical scheme of the invention, the sub-seismic faults can be quantitatively predicted and the prediction accuracy is high.

Description

technical field [0001] The invention relates to the technical field of geological exploration and development of fault oil and gas reservoirs, in particular to a subseismic fault quantitative prediction method based on fractal theory and three-dimensional geomechanics simulation. Background technique [0002] Faulting is an important factor controlling the formation of sedimentary basins, hydrocarbon migration and accumulation, and improving reservoir quality. Through the interpretation of 2D or 3D seismic data, large-scale underground faults can be clearly identified, and small-scale faults can also be effectively identified using 1D drilling data. Between 20 meters, often called subseismic faults, including isolated small faults as well as the ends of large faults, they are usually neither identifiable from seismic data nor from well data. However, such subseismic faults are Key factors controlling effective reservoir formation, oil and gas accumulation, water injection d...

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a kind of subseismic fault quantitative prediction method, this subseismic fault quantitative prediction method is used to solve existing quantitative prediction for subseismic fault quantity, extension length, maximum fault distance, azimuth and development position, not effective enough

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