Abstract：Jilin surveying area is mature prospecting area, but there exist many urban areas where the seismic exploration has not been carried out. Using 3-D swath special geometry can better conduct the seismic acquisition in complex surface conditions. The paper expounded the design of special geometry in Qian'an urban area and its applied effects. The missing of the shot-points in urban area resulted in missing of short offsets that made the shallow data incomplete, which is difficult to acquire the acquisition targets by using normal geometry. Infilling receiver lines in urban area can effectively compensate the missing short offsets because of shortage of shot points in urban area, which guaranteed the completeness of shallow data and also can effectively increase folds and suppress environmental noises in urban area at the same time; the deep weak reflected energy caused by small charge size in urban area can be complemented by infilling shot points outside urban area that can effectively increase the deep reflected energy. The method is of benefit to link up the seismic data inside and outside the urban area,which is of benefit to data processing and convenient to field construction. The practice showed that using this special geometry could obtain good acquisition effects.
杨光大, 郭东启, 李忠惠, 周德. 乾安城区特殊观测系统设计及应用[J]. 石油地球物理勘探, 2005, 40(4): 377-380.
Yang Guang-da, Guo Dong-qi, Li Zhong-hui, Zhou De. Design of special geometry and application in Qian'an urban area. OGP, 2005, 40(4): 377-380.
