Abstract：In order to integrate dissection of structural feature and development history of Nanxiang basin, three backbone sections were deploy ed in the basin. Since the backbone sections cut across different structural units, which made seismic and geologic conditions complex and variable, using un-itary geometry is difficult to fulfill seismic exploration task. The paper conducts the exploration target s-based geometry design, fully using available geologic and seismic data in local blocks of the basin to carry out analyses of geolog ic task and seismic and geologic conditions in deep and shallow layers. The geologic models are created by analysis of different exploration targets; purposefully developing the approaches demonstration and fully considering the variation of seismic and geologic conditions in separate structural units, decomposing geologictask according to different blocks and zones, classifying the seismic and geologiccond-itions in deep and shallow layers, designing geometry and acquisition parameters optimally in view of geologic task line by line and segment by segment, well dealing with joining relation between different geometry, which achieves gradual transition of spread length and folds, all these measures achieved better geologic results and reduced exploration cost.
