Role of Sedimentary Microfacies Characteristics in Rock Mechanical Behavior, a Case Study in Asmari Formation, SW Iran

Document Type : Research Paper

Authors

1 Department of Geology, College of Science, University of Tehran, Iran

2 Division of Geology, Iranian Central Oilfields Company, Iran

Abstract

Nowadays, geomechanical studies in hydrocarbon reservoirs are interesting; therefore, the objective of this paper is to investigate the impact of facies, texture and diagenesis on the geomechanical behavior of the Asmari Formation. Three sets of data were used in this research: 1) sedimentological data including thin section petrography, porosity and density, 2) rock mechanical data comprising (1) uniaxial compressive strength, (2) cohesion, (3) friction angle, (4) tensile strength, and (5) brittleness and drillability indexes, and 3) ultrasonic data including S- and P-wave velocities. To investigate a possible relationship between the sedimentological features and rock mechanical behaviors, a facies index was defined based on the textural and diagenetic features allowing to quantify a sedimentary microfacies. Based on facies index, porosity and UCS five different geomechanical facies were determined for the Asmari Formation, where GMF1 to GMF5 represent very ductile to very brittle behavior respectively. Finally, the results of the study showed that mechanical behavior is controlled by the depositional and diagenetic overprints. Furthermore, by facies index, the rock strength may be predicted based on petrographical observations. Such studies are helpful for reducing the costs/time for acquiring geomechanical datasets and zoning mechanical stratigraphy.
 

Keywords

References

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Journal of Petroleum Research
Volume 30, 99-4 - Serial Number 113
November and December 2021
Pages 80-95

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