Application of OVT-domain Q-migration technology in shale oil development in Qingcheng
HUANG Yan1, YAO Zonghui2, ZHAO Yuhua13, CHEN Juan1, CAO Yongliang1
1. Institute of Exploration and Development, Chang-qing Oilfield Company, PetroChina, Xi'an, Shaanxi 710021, China; 2. Changqing Oilfield Company, PetroChina, Xi'an, Shaanxi 710021, China; 3. National Engineering Laboratory for Low-permeability Oil and Gas Exploration and Development, Xi'an, Shaanxi 710021, China
Abstract：To overcome the low resolution of seismic data on the shale oil reservoir in the Qingcheng area and meet the demand of fracture distribution prediction,this paper proposes using multiple information to build a time-domain Q model and employing the five-dimensional interpolation method to eliminate the large offset vector tile (OVT) holes in the seismic data acquired in the loess plateau. Then,Q-migration is performed in the OVT domain. The proposed method is applied to process actual data. According to the results,the high-frequency component in the seismic wave is effectively restored,and high-resolution gather data containing azimuth information are obtained. The effective bandwidth of the imaging section is 5Hz wider than that of the imaging section attained by conventional migration. The seismic response characteristics of the reservoir are consistent with the actual drilling. Effectively guiding the placement and trajectory design of the horizontal wells,the proposed method achieves favorable application results and promotes the efficient shale oil development in Qingcheng.
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