Near-surface investigation in velocity reversal areas and their static corrections
Wang Ruizhen1, Cui Hongliang1, Xiong Feng1, Qiu Wenping2, Wang Huancheng1, Wang Xuan3
1. Huabei Geophysical Prospecting Division, BGP Inc., CNPC, Renqiu, Hebei 062552, China;
2. Huabei Branch, GRI, BGP Inc., CNPC, Renqiu, Hebei 062552, China;
3. School of Energy Resources, China University of Geosciences(Beijing), Beijing 100089, China
Abstract：High-precision static corrections play an important role in seismic data quality improvement in the processing. It is difficult to accurately establish near-surface structures in complicated terrain areas using the conventional refraction survey method,especially in near-surface velocity reversal areas such as igneous intrusion and eruption areas. Media physical parameters of different depths in near-surface can be reflected by different wavelengths of surface waves, and are not affected by velocity reversal. So based on these surface wave characteristics,we can effectively investigate near-surface structures in velocity reversal areas. There are two important points when the method is applied in the practice:①Geometry design should satisfy the spatial domain and the time domain; ②Joint interpretation of refraction and surface wave data is needed. Based on our experience,the proposed method can effectively improve the accuracy of near-structures in velocity reversal areas and provide accurate statics.
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