3D refraction traveltime inversion in common-recei-ver-bins
Jin Changkun1,2, Zhang Jianzhong1,2,3
1. Key Laboratory of Submarine Geosciences and Prospecting Techniques, Ministry of Education, Qingdao, Shandong 266100, China;
2. College of Marine Geosciences, Ocean University of China, Qingdao, Shandong 266100, China;
3. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, Shandong 266061, China
Abstract：In this paper, an approach to 3D refraction traveltime inversion is proposed. First, work area is divided into common-receiver-bins (CRBs), and velocity of high-velocity layer for all bins is assumed to be constant. Velocity of the high-velocity layer for every CRB is calculated on instantaneous slopes of refraction time-distance curves. Then common azimuth gathers (CAG) are extracted from refraction data for a CRB based on traveltimes and offsets, and they are transformed into coordinate data based on their arithmetic mean values. After that, coordinate data in a CRB are fitted by least-square straight line and instantaneous slope of refraction time-distance curves is obtained. The reciprocal of this instantaneous slope is taken as velocity of high-velocity layer. After velocity for all CRBs is estimated, delay times for all source-receiver pairs can be calculated from refraction traveltime equations, which form a large linear equation. Finally delay times for each source and receiver are estimated by solving the equation set with smoothness constraint LSQR algorithm. Field data applications show that the proposed approach calculates accurately long-wavelength static corrections for 3D seismic data from a foothill belt in Xinjiang, West China.
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