A method and device for seismic pre-stack inversion of horizontal fractures

Abstract

The invention provides a seismic prestack inversion method and device for horizontal cracks, and the method comprises the steps: obtaining the physical property parameters of an underground medium in a target work area according to the logging data of the target work area, wherein the physical property parameters comprise the physical property parameters of each stratum and the parameters of each crack; extracting seismic wavelets of a borehole-side seismic trace set in the target work area according to the obtained physical property parameters of the underground medium; building a stratum initial model of the target work area according to the obtained physical property parameters of the underground medium; carrying out the inversion of a stratum model of the physical property parameters of an underground real medium in the target area according to the stratum initial model, the seismic wavelets of the borehole-side seismic trace set and an actual seismic trace set, and obtaining the stratum model of the physical property parameters of the real medium in the target area. The method can carry out the inversion of growth conditions of horizontal cracks according to the stratum initial model and the seismic wavelets of the borehole-side seismic trace set, and obtains the stratum model, comprising the horizontal cracks, of the physical property parameters of the underground real medium, so as to further predict a dessert region with abundant oil gas according to the above stratum model.

Description

technical field [0001] The invention relates to the technical field of seismic exploration, in particular to a horizontal fracture seismic pre-stack inversion method and device. Background technique [0002] With the increasing demand for exploration and development of unconventional oil and gas resources such as shale oil and gas and coalbed methane, fracture prediction has gradually attracted the attention of geologists and geophysicists. Conventional seismic post-stack fracture prediction techniques can only predict the distribution and extension direction of large-scale fractures. Studies have shown that the efficiency of unconventional oil and gas recovery is often directly proportional to the development of small and medium-sized fractures. Therefore, using seismic prestack inversion to predict small and medium scale fractures has become a research hotspot. [0003] Seismic prestack inversion mainly studies the properties of the subsurface medium by using the law tha...

AI Technical Summary

Problems solved by technology

In practice, horizontal fractures exist widely, but AVAz technology cannot predict the distribution and properties of such fractures

[0004] The inventor found in the research that the seismic pre-stack inversion method in the prior art can only invert vertical and uniformly distributed fractures to obtain a stratigraphic model of vertical fractures, which cannot perform inversion calculation on horizontal fractures

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