Geomechanics and Geoenergy Journal

Geomechanics and Geoenergy Journal

Investigation of the effect of sedimentary and diagenetic processes on the pore-throat sizes, Dalan and Kangan formations in the central part of the Persian Gulf

Document Type : Original Article

Authors
Samira Akbarzadeh 1
Vahid Tavakoli 2
Sepideh Davoodi 1
1 School of Geology, College of Science, University of Tehran, Tehran, Iran
2 University of Tehran, Tehran, Iran
10.22107/jpg.2024.446278.1230
Abstract
This study investigated the effect of various factors on the pore-throats, in a well in the upper Dalan and Kangan Formations in the central part of the Persian Gulf. Microfacies, sedimentary environments, dominant diagenetic processes on microfacies and the general effect of primary and secondary processes on the dispersion of porosity and permeability data, was investigated. Petrographic studies led to the identification of 12 microfacies in four facies belts in an epeiric carbonate platform environment. The grain dominant texture has higher values of porosity and permeability compared to the mud dominated texture. The most prevalent diagenetic processes are dolomitization, dissolution, cementation and compaction. The moldic, vuggy, intercrystalline and intergranular porosities are the most important identified pores. The study of the effects of each diagenetic process separately indicates the effect of the process of dissolution and dolomitization on increased the pore-throats and reservoir quality. Results showed that cementation and compaction alone do not have a reducing role and its greater effect is due to the combination of both factors. In order to investigate the effects of facies and diagenesis on the pore-throat, porosity and permeability data were plotted on the Winland diagram and seven rock types with different pore-throats were identified. Due to the effects of different diagenetic factors on the microfacies, the pore-throat sizes vary between same microfacies. The grain dominant facies (packstone and grainstone) belonging to the shoal facies belt, have the highest pore-throats and the best rock type determined by the Winland method. Plotting the porosity and permeability data in the Winland diagram has let to detection of 7 zones with different pore throat size, that samples with higher R35 are affected by dissolution and dolomitization and samples with lower R35 are affected by cementation and compaction.
Keywords
Microfacies
Diagenetic
Dalan & Kangan formations
Pore-throats
Winland diagram
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Geomechanics and Geoenergy Journal
Volume 7, Issue 1
Winter 2024
Pages 64-80