Application of constrained tomographic inversion in seismic velocity modeling of glutenite bodies
JIN Changkun1, QIN Ning1, GUAN Jian1, ZONG Zhaoyun2, LI Kun2, LIU Qunqiang1
1. Geophysical Research Institute, Shengli Oilfield Company, SINOPEC, Dongying, Shandong 257022, China; 2. School of Geoscienes, China University of Petroleum (East China), Qingdao, Shandong 266580, China
Abstract：Glutenite bodies widely exist in steep slope zones of faulting depression basins，and they can develop various hydrocarbon reservoir types with great exploration potential.However，due to their complex spatial distribution and overlap relationship，and large velocity differences with the surrounding rocks，it is difficult to employ the conventional grid tomographic modeling methods in the imaging domain to obtain their refined models.Thus，based on the grid tomographic inversion method in the imaging domain，this paper proposes a constrained tomographic inversion method in the imaging domain to improve the modeling accuracy of glutenite bodies.The thought of layer constraints is adopted，and the spatial distribution information of glutenite bodies obtained from seismic interpretation is combined to delineate key inversion regions.Meanwhile，it introduces the logarithmic barrier function and limits the velocity variation range of the glutenite bodies by applying inequality constraints to improve the modeling accuracy of the bodies.The application results in the BS work area indicate that compared with the original grid tomographic model，the velocity model built by this method is more consistent with the glutenite body distribution in the imaging section.Compared with the results of the fusion model，it can reveal the velocity changes inside the glutenite body，and the quality of its corresponding imaging section is also improved.
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