A method for velocity field with deep-well VSP tomography in complex areas
Hou Aiyuan1, Li Qingzhong1, Zhang Wenbo2
1. College of Marine Geosciences, Ocean University of China, Qingdao, Shangdong 266100, China; 2. Geophysical Research and Development Department, BGP Inc., CNPC, Zhuozhou, Hebei 072750, China
Abstract：One of the difficulties in piedmont belts of Western China is to obtain prestack depth migration velocity field,especial the deep velocity field.To solve this problem,we propose the deep-well VSP tomography method for velocity field in complex areas.In this method,the velocity of zero-offset VSP is taken as a relative stable value to fill velocity grids near the well,and a weighted velocity of zero-offset VSP is extrapolated to establish an initial velocity model.Meanwhile,we put forward a VSP first break bi-weighted tomography inversion algorithm based on the confidence level and the raypath length.Tests on a synthetic model demonstrate the effectiveness of the proposed method.
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