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Nonlinear Single Loop Litho-Petro-Elastic Prestack Inversion Using Data Assimilation TechniquesNormal access

Author: R. Bachrach
Event name: 80th EAGE Conference and Exhibition 2018
Session: AVO Technologies
Publication date: 11 June 2018
DOI: 10.3997/2214-4609.201801326
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 699.1Kb )
Price: € 20

Summary:
A new data assimilation algorithm for joint litho-petro-elastic inversion using nonlinear Zeoppritz reflectivity operators together with sequential filtering and running in place technique is presented. The sequential filtering approach is an attractive choice as integration of rock physics with seismic for multi-parameter estimation can become quickly ill posed. Data assimilation techniques integrate data and model in a manner that track the uncertainties, and can avoid the potential difficulties associated with multi-parameter nonlinear inversion which minimize a single cost function. The single loop LPE inversion scheme invert seismic data into lithology, elastic and petrophysical parameters through the assimilation process. The lithology and petrophysical parameters are treated as latent variables. The method is open for integration of other measurements and naturally provides ways to address data and prior model consistencies. I demonstrate the application on real data set from offshore Australia.


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