Key technologies for seismic exploration of Carboniferous volcanic rocks in Junggar Basin
GU Wen1,2, YIN Xingyao1, BIAN Baoli3, YU Baoli2, DENG Yong2, LIN Yu2
1. School of Geosciences, China University of Petroleum (East China), Qingdao, Shandong 266555, China; 2. Geophysical Research Institute, BGP Inc., CNPC, Zhuozhou, Hebei 072750, China; 3. Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay, Xinjiang 834000, China
Abstract：Taking the Carboniferous primary rhythmic ig-neous rocks in the center and the weathered volcanic rocks at the northwestern margin of Junggar Basin as examples, this study discusses the key techniques for solving difficulties in seismic exploration. According to the research, for primary rhythmic volcanic rocks, the use of low-frequency vibroseis acquisition, well-controlled low-frequency compensation, and interlayer multiple suppression can greatly improve the fidelity and spatial resolution of deep seismic data with the idea of lithologic oil and gas reservoirs. Quantitative prediction of superior reservoirs can be achieved by post-stack facies-driven inversion with the constraints of volcanic lithofacies predicted by multi-attribute fusion. For weathered volcanic rocks, according to the idea of later stimulated reservoirs, the continuous wave suppression of strong reflection interfaces and the TTI pre-stack depth migration technology of the “true” surface can realize fine imaging of structure, formations, and faults. Ancient landform restoration and fine identification of multi-attribute faults are conducive to identifying favorable target areas. The bandwidth of seismic data for volcanic rocks in the central Junggar Basin is increased from 3~25 Hz to 8~46 Hz, and the average coincidence rate of reservoir drilling is raised from 65% to 81%. This method can provide a reference for the exploration of similar volcanic rock reservoirs at home and abroad.
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