Determination of Geochemical Properties and Genetic Types of Gas Condensates Using Biomarker Studies and Chemometric Analysis in Persian Gulf Basin, Iran

Document Type : Research Article

Authors

1 Science and New Technology Campus, Petroleum Engineering Department, Semnan University, Iran

2 Dept. of Petroleum Engineering, Amirkabir University of Technology, Tehran, Iran

10.29252/anm.2019.9003.1313

Abstract

Summary
Comprehensive geochemical study shows the genetic relationship between 14 samples of gas condensates from the Persian Gulf. In this study, the samples were examined merely in terms of maturity, which led to a general trend towards maturation of the region. In this process, maturation increases from west to east of the Persian Gulf and also from the coastal Fars to the Persian Gulf and then to the Arabian section.
 
Introduction
Using collected data including data biomarkers derived from gas chromatography-mass spectrometry analysis. It provides relevant diagrams for maturity and source rock sedimentation environment as well as statistical analysis of existing samples for all fields. Matching the interpretations of these two to the desired results, the purpose of this Research has been achieved.
 
Methodology and Approaches
The Samples were collected from Dalan and Kangan reservoirs (Late Permian – Triassic) from 6 gas fields (gas condensate), Which constitute the most important Iranian gas/gas condensate reservoirs. In this study, in order to estimate the maturity of the samples (for the purpose of determining the thermal maturity of gas condensates and determining their range of placement in the maturity chart), as well as determining the sedimentary environment of the source rock and type of lithology, the available biomarker parameters obtained from the results gas chromatography - mass spectrometry (GC-MS) were used. The statistical methods used are agglomerative hierarchical clustering (AHC) and principal component analysis (PCA), which show that the studied gases are in three main genetic groups.
 
Results and Conclusions
According to the results of this study, the origin of hydrocarbons in the region of marine is organic matter with some organic matter of continental origin. Their maturity range is in the late stages of petroleum production and early gas window. This gas condensate is derived from the clastic lithological sources that have been generated under reducing environmental conditions and from type II and III kerogens. Three main groups of gas condensate from statistical analysis and and correlation to the source rock were identified using biomarker parameters related to maturity and sedimentation environment. The maturity from the Golshan field to the Salman field (from west to east of the Persian Gulf) increases and the sedimentary environment is different in the southern Persian Gulf Salman and Golshan fields (marine carbonate) from its northern fields such as Khayyam, Tabnak and Madar (marine shale).

Keywords

Main Subjects

Full Text

حوضه خلیج فارس یکی از غنی‌ترین مناطق حاوی هیدروکربنی جهان است. این حوضه دارای ۵۷ درصد (۷۱۵ میلیارد بشکه) از ذخایر نفت خام جهان و ذخایر قابل توجه گاز طبیعی (۲۴۶۲ تریلیون فوت مکعب)، شامل ۴۵ درصد از ذخایر گاز ثابت شده جهان است]1[. تاکنون مطالعات گسترده‌ای در خصوص ویژگی‌های ژئوشیمیایی هیدروکربورهای میادین خلیج فارس انجام شده است. از جمله، ربانی و همکاران (2014) اقدام به مطالعه ژئوشیمیایی 33 نمونه نفتی از گستره خلیج فارس نموده‌اند. بر اساس این پژوهش با استفاده از روش خوشه‌بندی سلسله مراتبی و روش آماری آنالیز اجزای اصلی بر روی داده‌های ژئوشیمیایی (شامل اطلاعات ترکیبات اشباع، ایزوپرنوئیدها و بایمارکرهای استران و هوپان) چهار گروه ژنتیکی در محدوده خلیج فارس شناسایی گردید]1[. مشهدی و ربانی (2015) نفت‌های سیستم هیدروکربنی کرتاسه در خلیج فارس را مورد بررسی قرار داده‌اند، در این مطالعه دو گروه ژنتیگی بر اساس پارامترهای ژئوشیمیایی تشخیص داده شد]2[.

مطالعات انجام شده در خصوص بررسی ژئوشیمیایی در ناحیه خلیج فارس، عمدتا به مخازن نفتی و سیستم هیدروکربنی ژوراسیک، کرتاسه و ترشیری مربوط بوده و تنها تعداد معدودی مطالعه در محدوده یک میدان بر روی سیستم نفتی پالئوزوئیک انجام شده است. از این رو در این پژوهش با استفاده از آنالیز ژئوشیمیایی با وضوح بالا و استفاده از روش آماری خوشه‌بندی سلسله مراتبی متراکم، برای ارزیابی ژنتیکی میان ۱۴ نمونه میعانات گازی جمع‌آوری شده از مخازن دالان و کنگان (پرمین و تریاس) مربوط به ۶ میدان در گستره خلیج فارس و نواحی فارس ساحلی پرداخته خواهد شد. با استفاده از مطالعات ژئوشیمیایی، سن سنگ منشاء احتمالی، بررسی محیط دیرینه و بلوغ حرارتی نسبی آنها تعیین شده و در نهایت با توجه به تفاسیر انجام شده بر روی بایومارکرهای موجود می‌توان به یک روند مشخص از افزایش نحوه بلوغ و همچنین ایجاد یک تمایز معین از نظر محیط رسوب‌گذاری سنگ منشا در ناحیه دست یافت.

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Journal of Analytical and Numerical Methods in Mining Engineering
Volume 9, Issue 19
September 2019
Pages 91-100

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History

  • Receive Date: 22 January 2018
  • Revise Date: 29 December 2018
  • Accept Date: 30 December 2018

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