Crack prediction method for preferred orientation daughter coherence

Abstract

The invention provides a crack prediction method for the preferred orientation daughter coherence, and belongs to the field of oilfield exploration. The method generates orientation daughters through a pre-stack seismic channel set, and then calculates coherence attributes among different orientations, and finally acquires a seismic data coherence body of the preferred orientation. The method includes: (1) pre-treatment of pre-stack seismic data; (2) extraction of a macro surface element channel set; (3) stacking branch orientation full migration distance channel sets to form the orientation daughters; (4) calculating seismic orientation daughter coherence to form orientation coherence daughters; and (5) calculating the maximum orientation coherence daughter to obtain the seismic data coherence body of the preferred orientation.

Description

Technical field [0001] The invention belongs to the field of oilfield exploration, and specifically relates to a fracture prediction method with sub-body coherence in an optimal azimuth. Background technique [0002] Natural fractures play an important role in petroleum exploration because there are fractures in almost every reservoir, rock type, and depth. Identifying these fractures and identifying the direction of the fractures can help prospectors better understand the reservoir. The size of underground fractures is diverse. The fractures below 10 meters below the seismic magnitude are of great interest to everyone in the description of the reservoir. It is important for geophysicists to determine the maximum fracture density area or determine the orientation of these fractures in the reservoir. It is an important technical challenge. [0003] Since the appearance of the coherence cube as an attribute of seismic data for calculating seismic coherence, the research on using se...

AI Technical Summary

Problems solved by technology

[0004] At present, the method of using seismic coherence technology to identify fractures is often based on post-stack seismic data, and the main problem faced by post-stack seismic data is the lack of azimuth data. Azimuth angle, the obtained seismic coherence result is also the result of the average fracture information of all azimuths, which is no problem for the development and prediction of large underground faults or larger fractures, but for some small-scale fractures and In other words, the averaged results obliterate the azimuth direction of the fracture development

Images