XU JiaLiang, ZHOU DongHong, WANG YuYing, Bian LiEn, LÜ ZhenYu
.2018.Forward analysis of the influencing factors in prestack time migration imaging of fault surface waves based on the staggered-grid finite-difference method.Chinese Journal Of Geophysics,61(2): 733-741,doi: 10.6038/cjg2018K0501
基于交错网格有限差分法的断面波叠前时间偏移成像影响因素正演分析
徐嘉亮, 周东红, 王玉英, 边立恩, 吕振宇
中海石油天津分公司渤海石油研究院, 天津 300452
Forward analysis of the influencing factors in prestack time migration imaging of fault surface waves based on the staggered-grid finite-difference method
XU JiaLiang, ZHOU DongHong, WANG YuYing, Bian LiEn, LÜ ZhenYu
Bohai Petroleum Institute, Tianjin Branch, CNOOC, Tianjin 300452, China
Abstract：Identification of faults is an important step in seismic data interpretation. In seismic signal response, a fault can be recognized by fault surface waves, so the quality of the imaging of fault surface waves determines how to characterize the fault. In this paper, the influence factors of such imaging is studied by forward modeling using the staggered-grid high-order finite-difference method. The parameters in this modeling include the cable length and acquisition direction, the formation dip and reflection coefficient; and the migration method. The results of forward modeling demonstrate that selecting the reasonable acquisition parameters can improve the illumination of fault surface waves. Combining with the geological factors can enhance the accuracy of fault interpretation. Using reasonable migration methods can make the fault homing more accurate. Based on the above conclusions, for accurate identification and characterization of fault surface waves, we should integrate acquisition, treatment and geological factors. Only in this way can the interpretation accuracy of faults be improved greatly.
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