Physical geography evaluation method for stratigraphic stratification of shale gas

Abstract

The invention discloses a physical geography evaluation method for the stratigraphic stratification of the shale gas. The method comprises the steps of S1, based on the existence of a pre-stack seismic system, detecting the development condition of the stratigraphic stratification of the shale gas by seismic exploration equipment based on the curvature attributes of seismic data, scanning the cracks of the seismic data of each directional body in the stratigraphic stratification of the shale gas by the seismic exploration equipment based on the coherence cube technique so as to generate a rose diagram, and then analyzing the directions of the cracks; S2, adopting the propagation velocity as the important first-class evaluation item of the physical geography evaluation method for the stratigraphic stratification of the shale gas. According to the invention, the relationship between the anisotropy parameters of the shale gas and the stratification density of the shale gas is considered, so that the horizontal stratification evaluation of the shale gas is more intuitively understood. Meanwhile, the development condition, the crack information and the constituents of the stratigraphic stratification of the shale gas are detected and analyzed. Therefore, the method has an important significance on the exploration and the development of the shale oil and gas reservoir.

Description

technical field [0001] The invention relates to the technical field of unconventional oil and gas seismic exploration, in particular to a shale gas formation bedding geophysical evaluation method. Background technique [0002] Pre-stack seismic data contains a lot of information that post-stack data does not have, so pre-stack seismic inversion is widely used in reservoir prediction and fluid identification. During the shale deposition process, due to the discontinuous deposition of various sediments in the vertical direction, the layered structure formed by primary deposition is called horizontal bedding. In other words, due to the existence of horizontal bedding, shale has the characteristics of VTI medium, which makes shale show polarization anisotropy. Anisotropy parameter is an important index to measure the strength of anisotropy. For fractured reservoirs in HTI media, fracture density refers to the number of fractures per unit volume, which is the main factor affecti...

AI Technical Summary

Problems solved by technology

[0003] The existing shale oil and gas reservoirs based on polarization anisotropy inversion only evaluate the anisotropy of shale, but do not establish the relationship between anisotropy parameters and horizontal bedding and the shale gas The fracture information, composition and development of formation bedding are not well understood, so the evaluation of shale horizontal bedding cannot be truly realized only by simple anisotropy parameters

Images