Density and velocity analysis and seismic reflection model construction of marine Mesozoic-Paleozoic in the North Jiangsu-to-South Yellow Sea Basin
Lei Baohua1,2,3, Chen Jianwen1,2,3, Wu Zhiqiang1,2,3, Zhang Yinguo1,2,3, Liang Jie1,2,3, Li Gang1
1. Qingdao Institute of Marine Geology, China geology Survey, Qingdao, Shandong 266071, China; 2. Laboratory for Marine Mineral Resource, Qing-dao National Laboratory for Marine Science and Technology, Qingdao, Shandong 266071, China; 3. Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology, Ministry of Land and Resources, Qingdao, Shandong 266071, China
Abstract：Seismic imaging of marine Mesozoic-Paleozoic is difficult in the North Jiangsu-to-South Yellow Sea Basin,which brings many difficulties to the petroleum exploration.A reflection model can be built based on the principle that rock density and velocity differences cause different seismic reflection waves,and seismic markers can be recognized and formation properties can be predicted.Therefore we investigate target density and velocity data in the study area,analyze velocity and density variation with depth,lithology,stratigraphic,and diagenesis.Then we build velocity,density,and reflection models of the target,and compare them with seismic data.Based on this research,there is large difference in velocity and density between carbonate rocks and clastic rocks in the upper marine strata of the target,and there is little difference between them in the lower strata.In the built reflection model,there are 3 markers of strong reflection in the Paleozoic,corresponding to 3 interfaces:they are the interface between Qixia formation and Gufeng formation in the lower Permian,the interface between Gaolishan formation and Hezhou formation of the Lower Carboniferous,and the interface between Tangtou formation and Wufeng formation of the upper Ordovician.These model interfaces can compare with the first quality of latest seismic data in the South Yellow Sea Basin.
雷宝华, 陈建文, 吴志强, 张银国, 梁杰, 李刚. 苏北—南黄海盆地海相中—古生界密度和速度分析及其地震反射模型构建[J]. 石油地球物理勘探, 2018, 53(3): 558-567.
Lei Baohua, Chen Jianwen, Wu Zhiqiang, Zhang Yinguo, Liang Jie, Li Gang. Density and velocity analysis and seismic reflection model construction of marine Mesozoic-Paleozoic in the North Jiangsu-to-South Yellow Sea Basin. Oil Geophysical Prospecting, 2018, 53(3): 558-567.
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