Three term AVO approximation of Kf-Km-ρ and prestack seismic inversion for deep reservoirs
Yin Xingyao1, Wang Huixin1,2, Cao Danping1, Zhou Qijie1, Guo Shuwen3
1. School of Geosciences, China University of Petroleum(East China), Qingdao, Shandong 266580, China; 2. Institute of Exploration and Development, SINOPEC Shanghai Offshore Oil & Gas Company, Shanghai 200120, China; 3. Research Institute of Exploration and Development, Dagang Oilfield, PetroChina, Tianjin 300280, China
Abstract：With deeply buried targets,information of large incident angles is deficient.Conventional fluid factors are not sensitive enough to discriminate fluid in reservoirs due to the deep compaction.So a more sensitive fluid indicator aiming at small incident angle is needed to be built for deep reservoir.With the characteristics of rock physics,we derive a new three term AVO approximation in terms of pore-fluid bulk modulus Kf,which is more sensitive to hydrocarbon,dry rock matrix term fm,and density ρ.The accuracy of the new approximation is almost equivalent to exact Zoeppritz equation.Consequently the new approximation can meet the requirements of inversion.In addition,tests on synthetic data show that the pore-fluid bulk modulus Kf can be reliably estimated from the prestack seismic data.We built a flow path of extracting pore-fluid bulk modulus Kf by elastic impedance inversion for deep reservoirs with small incident angles.And the proposed method is proved to be accuracy,reliable and feasible after real data tests.
印兴耀, 王慧欣, 曹丹平, 周琦杰, 郭淑文. 利用三参数AVO近似方程的深层叠前地震反演[J]. 石油地球物理勘探, 2018, 53(1): 129-135.
Yin Xingyao, Wang Huixin, Cao Danping, Zhou Qijie, Guo Shuwen. Three term AVO approximation of Kf-Km-ρ and prestack seismic inversion for deep reservoirs. Oil Geophysical Prospecting, 2018, 53(1): 129-135.
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