Abstract:Deep strata in Yinggehai Basin have good hydrocarbon potentials.Seismic reflection characteristics of gas reservoir and dim spot targets in deep high-temperature and ultra-high pressure are clarified based on rock physics analysis and seismic forward modeling.Difficulties in dim spot target identification are also discussed.Based on our mentioned research,we propose a three-step approach of dim spot target identification.The first step is dim spot identification.Weak reflection bodies with AVO type 2 anomaly on stack sections are considered as dim spots based on FN attribute.The se-cond step is lithology identification.The reservoir identification is achieved with vP/vS differences between sandstone and mudstone,and false FN attribute anormalies caused by other lithology are eliminated.The third step is physical properties prediction,which is achieved with the linear relationship between sandstone porosity and P-and S-wave impedances,and sweep spots are identified at the same time.The proposed approach is applied to the Block Ledong and Ledong 10-X dim spot is identified.The latest drilling proves the feasibility and effectiveness.
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