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Rock physics modelling and inversion for saturation‐pressure changes in time‐lapse seismic studies
Author(s) -
Lang Xiaozheng,
Grana Dario
Publication year - 2019
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1111/1365-2478.12797
Subject(s) - petrophysics , saturation (graph theory) , geology , engineering geology , seismic inversion , inversion (geology) , igneous petrology , geophysics , pore water pressure , economic geology , regional geology , hydrogeology , soil science , porosity , geotechnical engineering , seismology , metamorphic petrology , physics , volcanism , mathematics , meteorology , data assimilation , combinatorics , tectonics
Time‐lapse seismic data are generally used to monitor the changes in dynamic reservoir properties such as fluid saturation and pore or effective pressure. Changes in saturation and pressure due to hydrocarbon production usually cause changes in the seismic velocities and as a consequence changes in seismic amplitudes and travel times. This work proposes a new rock physics model to describe the relation between saturation‐pressure changes and seismic changes and a probabilistic workflow to quantify the changes in saturation and pressure from time‐lapse seismic changes. In the first part of this work, we propose a new quadratic approximation of the rock physics model. The novelty of the proposed formulation is that the coefficients of the model parameters (i.e. the saturation‐pressure changes) are functions of the porosity, initial saturation and initial pressure. The improvements in the results of the forward model are shown through some illustrative examples. In the second part of the work, we present a Bayesian inversion approach for saturation‐pressure 4D inversion in which we adopt the new formulation of the rock physics approximation. The inversion results are validated using synthetic pseudo‐logs and a 3D reservoir model for CO 2 sequestration.