Elimination of strong reflection influence based on optimized variational mode decomposition method: a case study of the target processing of beach bar sand of Es4 in Dongying Sag
JIANG Yu1, ZHANG Junhua1, HAN Hongwei2, FENG Deyong2, YU Jingqiang2
1. School of Geosciences, China University of Petroleum(East China), Qingdao, Shandong 266580, China; 2. Geophysical Research Institute, SINOPEC Shengli Oilfield, Dongying, Shandong 257022, China
Abstract：Affected by the shielding effect of the interface between Chunshang submember and Chunxia submember of Es4 in Dongying Sag,the seismic reflections of the beach bar sand reservoir in Chunxia submember are weak.Optimized variational mode decomposition technology was used to decompose the target layer seismic signals into multi-band components with different waveform features to suppress the influence of the strong reflection shielding effectively.Strong reflection information with strong energy and low frequency,mostly concentrate in the first component.Through stripping strong signal components and reconstructing resi-dual information,the effective signals of underlying reservoirs can be strengthened.Theoretical model test and the application in real data demonstrated that the method has higher resolution,more complete decomposition and avoids modal aliasing effect compared with conventional empirical mode decomposition method(EMD).It is worth applying to the regions with similar conditions.
江馀, 张军华, 韩宏伟, 冯德永, 于景强. 优化变分模态分解方法消除强反射影响——以东营凹陷沙四段滩坝砂目标处理为例[J]. 石油地球物理勘探, 2020, 55(1): 147-152,166.
JIANG Yu, ZHANG Junhua, HAN Hongwei, FENG Deyong, YU Jingqiang. Elimination of strong reflection influence based on optimized variational mode decomposition method: a case study of the target processing of beach bar sand of Es4 in Dongying Sag. Oil Geophysical Prospecting, 2020, 55(1): 147-152,166.
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