The new two-term elastic impedance inversion and its application to predict deep gas-bearing carbonate reserviors
Gao Gang1,2, He Zhenhua1, Cao Jun-xing1, Gui Zhixian2, Cai Hanpeng1
1. State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu,Sichuan 610059,China;
2. Key Laboratory of Exploration Technologies for Oil and Gas Resources of Ministry of Education,Yangtze University,Wuhan,Hubei 430100,China
Abstract：Changxing formation carbonate reservoirs aredeeply buried in the Northeastern Sichuan Basin.Seismic data with large angle is hardly acquired，and data signal-to-noise ratio is very low.In orderto meet these challenges，by introducing a new ap-proximate formula, a method to pick up petro-physical parameters from two elastic impedance da-to volumes with middle and small angles is pro-posed in the paper. Based on Aki-Richards approx-imation formula of Zoeppritz’s equation, the newtwo-term elastic wave impedance formula ex-pressed by compressional wave impedance andshear wave impedance is derived.In the discardeddensity item，the density approaches to compres-sional wave impedance by using compressionalwave velocity and density of exponential fitting.On the other hand，the accuracy，stability，noiseimmunity of the inversion is improved by the Tik-honov regularization method.Numerical experimenu and seismic data applications prove the feasibility of this method.
高刚, 贺振华, 曹俊兴, 桂志先, 蔡涵鹏. 两项式弹性波阻抗反演方法在深层碳酸盐岩储层预测中的应用[J]. 石油地球物理勘探, 2013, 48(3): 450-457.
Gao Gang, He Zhenhua, Cao Jun-xing, Gui Zhixian, Cai Hanpeng. The new two-term elastic impedance inversion and its application to predict deep gas-bearing carbonate reserviors. OGP, 2013, 48(3): 450-457.
