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AVAZ Quantitative Interpretation Based on Orthorhombic Medium-Part Two: AVAZ InversionNormal access

Authors: K. Xu, Q. Qi, Q. Guo, P. Xiao and Z. Liang
Event name: 80th EAGE Conference and Exhibition 2018
Session: AVO/AVA Analysis - Case Histories
Publication date: 11 June 2018
DOI: 10.3997/2214-4609.201800666
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 4.96Mb )
Price: € 20

In this paper, we mainly talk about orthotropic AVAZ inversion technique, it has proven to be important and effective for shale gas evaluation and development. We use pre-stack AVAZ inversion to predict elastic properties, it is carried on pre-stack azimuthal gathers with constrained wells. A slight modification was made on the basis of Bachrach's (2004) equation in order to obtain elastic parameters such as P-wave impedance, S-wave impedance, combinations of anisotropic parameters and fracture orientation from inversion. This work could offer multiple elastic parameters that characterize the quality of shale reservoirs. This method is successfully applied in real data of Sichuan Basin, it shows that the results of inversion are effective and reasonable.

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