Abstract:The low-relief structure of the Guantao Formation in the Matouying area of Jidong Oilfield is very potential in exploration. However,with complex terrains and developed faults,and limited by less accurate depth-domain velocity models,it is difficult to identify the low-relief structural traps. To this end,a new and comprehensive velocity modeling scheme is proposed as follows:Considering the influence of faults,first establish an accurate horizon interpretation model in time domain,and based on the model,effectively eliminate the impact of dramatic changes in lateral velocity caused by faults;second,considering that error accumulation of the shallow velocity model in prestack depth migration affects the imaging quality of deep target layers,invert the accurate near-surface velocity field by diving wave tomography for shallow layers,build the velocity model by reflected wave tomography for middle layers,and combine the two parts to obtain a merged velocity field;finally improve the velocity model on the basis of the merged velocity field and model-based high-precision grid tomography under the constraint of geological horizons. The high-precision velocity model established by the above scheme has significantly improved the i-maging accuracy of the low-relief structure in the Matouying area in the Jidong Depression,and the result is consistent with drilling data. This modeling scheme is a reference to imaging low-relief structures with similar geological conditions.
王鹏, 王小卫, 雍运动, 刘威, 郄树海. 马头营地区低幅度构造速度建模方法[J]. 石油地球物理勘探, 2020, 55(4): 766-773.
WANG Peng, WANG Xiaowei, YONG Yundong, LIU Wei, QIE Shuhai. Velocity modeling of the low-relief structure in the Matouying area of Jidong Oilfield. Oil Geophysical Prospecting, 2020, 55(4): 766-773.
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