Geomechanics and Geoenergy Journal

Geomechanics and Geoenergy Journal

Influence of Depositional Environment, Microfacies, and Diagenesis on Electrical Resistivity Changes: Permian-Triassic Sequence, Central Persian Gulf

Document Type : Original Article

Authors
Sajjad Omrani 1
Vahid Tavakoli 2
1 University of tehran
2 University of Tehran, Tehran, Iran
10.22107/jpg.2024.462337.1234
Abstract
Understanding the variations in electrical conductivity in porous media is relevant in various fields, including geology, petroleum engineering, and chemistry. Changes in rock electrical resistivity can indicate alterations in their geomechanical properties. Electrical conductivity in rocks reflects the geometric relationships of pores within rock samples, which are influenced by the depositional environment, microfacies, and diagenetic processes. Thus, a thorough study of geological and petrophysical characteristics and their connection to changes in electrical resistivity is crucial for identifying and developing hydrocarbon fields. This research, for the first time, explores the impact of the depositional environment, microfacies, diagenetic processes, and petrophysical factors on the variations in the electrical resistivity of rocks. The dataset for this study comprises 293 meters of core samples, 720 porosity and permeability data points, 921 thin section images, and 251 meters of various well log data, collected from an exploratory well in the central Persian Gulf. The study involved identifying and determining microfacies and depositional environments, examining diagenetic processes through microscopic and macroscopic analysis, and evaluating electrical conductivity in these environments and microfacies using the formation's deep electrical resistivity log. Results show that samples from lagoon environments have lower electrical resistivity and higher permeability, while those from open marine environments exhibit higher electrical resistivity and lower permeability. The sabkha environment, due to extensive anhydrite cementation, has the highest electrical resistivity. Diagenetic processes like dolomitization and isopachous calcite cementation reduce electrical resistivity by improving pore connectivity and preserving primary porosity. Conversely, anhydrite cement and blocky calcite cement increase electrical resistivity by blocking pores and pore throats.
Keywords
Electrical resistivity
Microfacies
Diagenetic processes
Petrophysical properties
Pore throats
Calcite cement
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Geomechanics and Geoenergy Journal
Volume 7, Issue 2
Winter 2024
Pages 39-52