Fracture Prediction Based on Anisotropy Inversion of Seismic Multi-Attribute in OVT Domain
For coalbed methane exploitation,faults and fractures are the main migration channels,which effectively reconstruct the reservoir of coal seam.At the same time,faults and associated fractures are also the main factors of groundwater hazards.Effective fault and fracture detection is of great significance to the exploration and development of coalbed methane.In recent years,with the gradual maturity of wide azimuth seismic acquisition and processing technology,its rich azimuth information provides a way for predict of fractures.Based on the spatial similarity of inversion results of anisotropic characteristic parameters with different attributes,a new method for predict of fracture strike and density is developed by using the azimuth variation information presented by seismic data in OVT domain in terms of velocity,amplitude,phase and frequency.This method overcomes the traditional seismic attribute is difficult to depict the shortage of the tiny cracks,make full use of the properties such as velocity,amplitude,phase,frequency of anisotropic features and transverse discontinuity,the mix of anisotropy results reduce the interference of random noise to a single attribute,provide high-precision three-dimensional fracture interpretation data base.Through practical application in the exploration of coalbed methane in Qinshui Basin,it has been shown that the crack density and direction obtained by this method are closely related to the structure,and are consistent with the regional horizontal pressure,which can provide strong support for the exploration deployment of coalbed methane horizontal wells.
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