Rock physics modeling in carbonate reservoirs- Review of theoretical models and a case study

Document Type : Original Article

Authors

1 College of Engineering, University of Tehran

2 Assistant Professor, Institute of Petroleum Engineering, College of Engineering, University of Tehran

3 school of mining engineering, college of engineering, University of Tehran

Abstract

A wide range of the effective-medium models have been introduced to explain theoretically the effective elastic characteristics of the sedimentary rocks. They are classified into two main groups: contact models and inclusion models. Due to the more complex pore-space structure, rock physics modeling of carbonate rocks involves more challenges compared to the siliciclastics. Considering the assumptions/physical basis used in development of inclusion models, they are of high importance in the context of characterization of the elastic properties of carbonates. In this paper, the theoretical bases, algorithms and procedures of four widely-accepted inclusions models of Kuster-Toksoz, Self-Consistent (SC), Differential Effective Medium (DEM) and Xu-Payne has been first described. Based on these four inclusion models, rock physics analysis and modeling has been performed on four wells from a heterogeneous carbonate reservoir located in South-West of Iran. P-wave and S-wave velocities were estimated in the depth interval of Sarvak formation, and the results were then compared with the measured velocities. The qualitative and quantitative analyses of the results reveal that Xu-Payne model compared to the other three implemented rock physics models, gives a better consistency between modeled and measured data. In particular, the higher correlation coefficient and the lower mean absolute errors were observed between the measured velocities and the simulated ones by the Xu-Payne model at all the tested wells.

Keywords

References

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امامی نیری, م. (1396)، مدل‌سازی فیزیک‌سنگی در مخازن ماسه سنگی - مروری بر مدل‌های نظری و یک مثال کاربردی، نشریه علمی پژوهشی ژئومکانیک نفت 1( 2)، 74-85
Journal of Petroleum Geomechanics
Volume 3, Issue 4
May 2020
Pages 90-108

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