Evaluation of hydrocarbon generation in source rock using geochemical studies and 1D basin modeling in Kish field, northeast Persian Gulf

Document Type : Research Article

Authors

Dept. of Mining and Metallurgical Engineering, Yazd University, Yazd, Iran

Abstract

Summary
The Kish structure is a huge gas field located in the eastern part of the Persian Gulf. It has a significant amount of gas in Kangan and Dalan reservoirs. This work studies the history of burial and thermal, and the hydrocarbon generation potential of probable source rocks in the Kish gas field. Accordingly, a set of 58 rock samples collection was analyzed for pyrolysis of Rock-Eval 6 and vitrinite reflection. Moreover, the deepest well was modeled to reconstruct the burial and thermal history. The results indicate that the Sarchahan Formation is the main source rock of this field, and has produced 95% of its potential so far.
 
Introduction
The Persian Gulf basin is one of the most important regions in terms of hydrocarbon resources in the world. The Kish gas field is located in the eastern part of the Persian Gulf.  The purpose of this paper is to assess the hydrocarbon generation potential and to model the burial and thermal history of source rocks in this gas field using Rock-Eval pyrolysis, vitrinite reflection, and a 1D model.
 
Methodology and Approaches
In this study, 58 rock samples were selected from layers with high natural gamma ray in Pabdeh, Gurpi, Ilam, Lafan, Sarvak, Kazhdumi, Dariyan, Gadvan, Fahliyan, Surmeh, Neyriz, Dashtak, Dalan and Faraghan Formations for Rock Eval pyrolysis and vitrinite reflection. In addition, one-dimensional modeling of burial and thermal history was performed using PetroMod software (2011-Schlumberger) on well B of the Kish field.
 
Results and Conclusions
The TOC and S1+S2 values vary from 0.16 to 1.59%, and from 0.08 to 4.16 mg HC/g Rock, respectively. Most of the samples have low hydrocarbon potential, only a limited number from Gurpi and Pabdeh show fair hydrocarbon generation potential. The samples with fair potential have kerogen type III and II/III with the low level of maturity. The one-dimensional modeling was performed on Pabdeh, Gurpi and Sarchahan source rocks. The thermal model was calibrated with corrected down-hole temperatures and vitrinite reflections. According to the model, Pabdeh and Gurpi are immature, while the Sarchahan is currently in the gas window. It has reached the oil and gas window since 160 and 120 million years ago, and produced 95% of its potential so far.

Keywords

Main Subjects

Full Text

حوضه خلیج‌فارس یکی از حوضه‌های مهم هیدروکربنی جهان است که توسط میدان‌های عظیم نفت و گاز حوضه زاگرس در شمال و میدان‌های بسیار بزرگ کشورهای حاشیه جنوبی خلیج‌فارس احاطه شده است. سنگ‌های مادر بسیار خوبی در این حوضه در طول یکسری دوره‌های احیایی‌ همراه با بالاآمدگی سطح آب دریا، فرونشست‌های متعدد محلی و شرایط آب و هوایی مرطوب در طول سیلورین، ژوراسیک میانی و کرتاسه پسین نهشته شده است، بیشتر نفت تولیدشده توسط این سنگ‌های مادر در مخازن کربناته تجمع یافته است [1].

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History

  • Receive Date: 03 August 2021
  • Revise Date: 01 January 2022
  • Accept Date: 06 February 2022

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