Seismic acquisition in loess area, Southwestern Tarim Basin
Fan Zenghui1,2, Quyang Cheng3, Liu Shugen1, PuLiping4, Han Xiaojun2, Sun Wei1
1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, Chengdu University of Technology, Chengdu, Sichuan 610059, China;
2. Geophysical Prospecting Company, Chuanqing Drilling Engineering Ltd Co., CNPC, Chengdu, Sichuan 610213, China;
3. Geologic Exploration & Development Research Institute, Chuanqing Drilling Engineering Ltd Co., CNPC, Chengdu, Sichuan 610051, China;
4. State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, Southwest Petroleum University, Chengdu, Sichuan 610500, China
Abstract：Kunlun Mountains' foreland in Southwest Tarim Basin, China, iscovered with thick loess, whose thickness varies from dozens meters to even 600m.So S/N ratio of seismic data acquired in this area is very low due to serious energy absorption and strong secondary interference. On the other hand, compressed by Kunlun Mountains, the subsurface is very complex with developed faults. Based on our years' work, we summarize in the paper the following observations about seismic ac-quisition in loess area, Southwest Tarim Basin, mainly including: ① Wideline with long receiving spread is appropriate to increase the coverage of the targets, and improve data quality; ② Large source array with small charge size at each element under low velocity layer is suitable to preserve downgoing energy; ③ Large areal receiving array is effective to suppress lateral interference.
