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An efficient and comprehensive poroelastic analysis of hydrocarbon systems using multiple data sets through laboratory tests and geophysical logs: a case study in an iranian hydrocarbon reservoir

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Abstract

This study strives to analyze a poroelastic media, including water, oil, and gas, of a carbonate formation in southwest Iran. For this purpose, three data sets comprising geochemical, seismic, and geomechanical information from laboratory tests and well-logging operations were employed. In this research, seismic parameters, including P & S—wave velocity, velocity ratio (VP/VS), acoustic impedance (AI) and shear impedance (SI), were directly measured by well-logging data. Dynamic elastic moduli were calculated using the bulk density and seismic velocities. Uniaxial compressive strength (UCS) was calculated by empirical relationships and calibrated with a several laboratory tests. Initially, 41 un-contaminated core samples were tested for the Rock–Eval Pyrolysis (REP) chemical experiment. Simultaneous use of logs and chemical analysis identified three zones (A, B, C), including gas, water, and oil, for the evaluations, proving that hydrocarbon in zone C was migrated from other intervals. The results show that water saturation increases compressional wave velocity and decreases shear wave velocity through porous media. Elasticity is conjugately affected by both shear wave and compressional wave velocity. Accordingly, Young's modulus in the hydrocarbon zones increases while it experiences a decreasing trend in the water zone. On the other hand, the results exhibit a reduction in shear modulus in hydrocarbon zones compared with the water zone. In addition, in hydrocarbon zones, the shear impedance increases while the acoustic impedance decreases, in contrast to the water zone.

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Acknowledgements

The paper's authors express a special thanks to the National Iranian South Oil Company (NISOC) for supplying all data and information to present the research manuscript.

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This research received no specific grant from public, commercial, or not-for-profit funding agencies.

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Authors

Contributions

EM: data curation, analysis of the geomechanical data, writing the original draft, revision, and editing of the manuscript. ABMNA: geochemical laboratory tests and REP analysis, methodology, investigation, NSM: discussion and analysis of seismic results, revision, and editing of the manuscript. DM: geophysical studies, writing, revision, and editing of the manuscript. AE: calculating and analyzing the geomechanical results, writing the original draft, and revising and editing. PN: methodology, revision, and editing of the manuscript. DAM: analysis of results, revision, and editing of the manuscript.

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Correspondence to Danial Mansourian.

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Makarian, E., Abad, A.B.M.N., Manaman, N.S. et al. An efficient and comprehensive poroelastic analysis of hydrocarbon systems using multiple data sets through laboratory tests and geophysical logs: a case study in an iranian hydrocarbon reservoir. Carbonates Evaporites 38, 37 (2023). https://doi.org/10.1007/s13146-023-00861-1

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  • DOI: https://doi.org/10.1007/s13146-023-00861-1

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