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The potential analysis of elastic impedance in the lithology and fluid prediction.

Gan Lideng,SINOPEC Research Institute of Petroleum Exploration and Development,Beijing 100083,China Zhao Bangliu,Du Wenhui and Li Linggao.  
Based on analysis of elastic impedance concept,the procedure of elastic impedance inversion was presented by use of the traditional poststack seismic inversion methodology and software package because of similarity between acoustic impedance and elastic impedance definition. Synthetic gathers generated by fluid replacement modeling and seismic verified the validity and reliability of this procedure forward modeling with elastic wave equation.The potential of elastic impedance in predicting lithology and fluid properties was analyzed. In the SLG area.due to good comparability between elastic impedance log with 16 incidence angle and gamma ray log the effective reservoir can be identified by elastic impedance inversion which provides a most efficient way of seismic reservoir description.
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