Joint tomography of first break and reflection traveltime with multi-scale netsize method
Li Qingchun1,3, Ye Pei2
1. College of Geology Engineering and Geomatics, Chang'an University, Xi'an, Shaanxi 710054, China;
2. China Aero Geophysical Survey and Remote Sensing Center for Land and Resources, Beijing 100083, China
Abstract：For the single-wave inversion,it is usually very difficult to reconstruct accurate underground velocity information.And mesh sizes in the forward modeling and inversion are different in the tomography.In order to deal with these problems,we use data weighting algorithms such as Humphreys algorithm to model space and data space,and then use multi-scale netsize inversion strategy.Finally we update the model velocity and interface depth parameters by difference of the traveltimes calculated from the model and seismic records.The test results from theoretical model show that the joint tomography of first-break and reflection traveltime is better than the single wave traveltime tomography.Multi-scale netsize inversion can effectively deal with the problem of different mesh sizes in the forward modeling and inversion of tomography.The smaller netsize will be used in the inversion,the more accurate inversion result will be obtained.Real data tests show that this method is feasible and it can provide fine velocity model for seismic exploration.
李庆春, 叶佩. 初至波与反射波旅行时多尺度渐进联合层析成像[J]. 石油地球物理勘探, 2013, 48(4): 536-544.
Li Qingchun, Ye Pei. Joint tomography of first break and reflection traveltime with multi-scale netsize method. OGP, 2013, 48(4): 536-544.
