The impact of depositional, diagenetic and tectonic processes on the pore network evolution of the Sarvak reservoir, Sarkan Oil Field, Lurestan zone

Authors

1 Ph. D. (graduated), School of Geology, College of Science, University of Tehran, Tehran, Iran

2 Assoc. Prof., School of Geology, College of Science, University of Tehran, Tehran, Iran

3 Prof., School of Geology, College of Science, University of Tehran, Tehran, Iran

Abstract

Identifying the origin of pores, examining their characteristics, and understanding how they interrelate within the fabric of facies play a primary role in differentiating reservoir zones. In this study, Sarvak reservoir was evaluated at both microscopic and macroscopic scales based on available data from 3 wells in Sarkan Field. With investigating the reservoir in three separate phases, genesis and evolution of porosity during the time, influenced by mentioned process has been specified and the role of each of these processes has been evaluated. Most of the facies are mud-supported and have no reservoir characteristics because of the deep conditions at the time of deposition. Then, with surveying the diagenetic processes and providing a diagenesis history for the reservoir and also studying the fractures in both small and large-scale, it has concluded that the reservoir in this field has been influenced by both small- and large-scale fractures. Secondly, the reservoir properties have been changed by diagenetic processes, mainly dissolution and dolomitization. Finally, 5 pore systems have been recognized including vuggy, intercrystalline, stylolitic and fracturing. These pore types control the reservoir properties of this formation in the studied field.

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History

  • Receive Date: 10 June 2024
  • Revise Date: 03 November 2024
  • Accept Date: 09 November 2024

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