ارزیابی پتانسیل هیدروکربن‌زایی و تاریخچه تدفین سنگ‌های مادر محتمل در میدان سلمان، شرق خلیج فارس

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه اکتشاف، دانشکده مهندسی معدن و متالورژی، دانشگاه یزد، یزد، ایران

2 گروه مهندسی نفت، دانشکده مهندسی نفت، دانشگاه صنعتی امیرکبیر، تهران، ایران

چکیده

میدان سلمان، یکی از مهم­ترین میادین تولیدی در بخش شرقی خلیج فارس محسوب می­شود که در افق­های کنگان/دالان دارای گاز و در افق­های سورمه، گدوان و داریان دارای نفت است. پژوهش حاضر به بررسی پتانسیل هیدروکربن­زایی سازندهای گورپی، سروک، کژدمی، داریان، گدوان، فهلیان، سورمه و سرچاهان در میدان سلمان با استفاده از اطلاعات پیرولیز راک­اول، انعکاس ویترینایت و نتایج مدل­سازی یک بعدی در یکی از چاه­های عمیق میدان، می­پردازد. بدین منظور 50 نمونه سنگ، بجز سازند سرچاهان، از اعماق مختلف در دو چاه، مورد آنالیز و ارزیابی قرار گرفت. نمونه­های مربوط به سازندهای سروک و سورمه به ترتیب پتانسیل هیدروکربن­زایی خوب و متوسط را نشان دادند در حالی که بقیه نمونه­ها دارای پتانسیل ضعیف بودند. مواد آلی سازند سروک دارای کروژن تیپ II و مواد آلی سازند سورمه دارای کروژن تیپ II/III بودند. بنابر انعکاس ویترینایت حاصل از پتروگرافی و مدلسازی، سازند سروک نابالغ، سازند سورمه در اوایل پنجره نفتی و سازند سرچاهان در پنجره گازی قرار دارند. نسبت تبدیل برای سازند سرچاهان، 95 درصد است در حالی که این نسبت برای سازندهای سروک و سورمه صفر می­باشد. 

کلیدواژه‌ها


عنوان مقاله [English]

Evaluation of petroleum generation potential and burial history of probable source rocks in the Salman field, eastern part of the Persian Gulf

نویسندگان [English]

  • Ehsan Hosseiny 1
  • Alireza Rahmani 2
1 Department of Mining and Metallurgical Engineering, Yazd University, Yazd, Iran.
2 Department of Petroleum Engineering, Amirkabir University of Technology, Tehran, Iran
چکیده [English]

Introduction
The Persian Gulf basin is one of the most prolific and important hydrocarbon provinces in the world. The presence of rich source rocks, fractured carbonate reservoirs, effective cap rocks alongside large anticlines has led to the accumulation of large volumes of oil and gas in this area. This study investigates the hydrocarbon generation potential of probable source rocks in Salman field through using Rock Eval, vitrinite reflection and 1D model results in one of deepest wells.
Materials and methods
In this study, Rock-Eval 6 and Vitrinite reflection were used to evaluate the hydrocarbon generation potential of source rock samples. Accordingly, 50 and 18 rock samples from Gurpi, Sarvak, Kazhdumi, Dariyan, Gadvan, Fahliyan and Surmeh formations in two wells of Salman were analyzed, respectively. Moreover, one-dimensional modeling of burial history was performed by using Petromed software (2011-Schlumberger) on well B of Salman field.
Results and discussion
The TOC of the samples is between 0.16 and 2.83%, of which about 90% have a value less than one. Petroleum potential index (S1+S2) varies from 0.43 to 17.5 mg HC/gr Rock. The highest TOC and petroleum potential index values are related to Sarvak samples. Surmeh samples indicate fair petroleum generation potential while the rest of the samples indicate poor petroleum generation potential. Based on HI, Sarvak and Surmeh samples have kerogen type II and II/III respectively. Vitrinite reflectance values range from 0.3 to 0.55, indicating that the samples are in the immature to early mature stages. One-dimensional modeling was performed to determine the burial and thermal history of the Sarchahan, Surmeh and Sarvak source rocks and the time of hydrocarbon generation at well B. The temperature history of the layers in the sedimentary basin is estimated by model and calibrated by vitrinite reflections. According to estimated vitrinte reflection (Sweeney and Burnham model), Sarvak Formation is immature and Surmeh Formation is early mature. The Sarchahan Formation is currently in gas window. This formation has entered the peak of the oil window since 157 million years ago and entered the gas window since 75 million years ago.
Conclusions
Geochemical assessment of different formations in Salman field confirmed that Sarvak, Surmeh and Sarchahan formations are the most important source rocks in the eastern part of the Persian Gulf. Sarchahan source rock is in the gas window and has produced 95% of its potential so far. Organic matters of Sarvak and Surmeh formations have kerogen type II and II/III, respectively. Sarvak Formation is immature and Surmeh Formation is in the early oil window. Although Sarvak Formation is immature in Salman field, it could generate high amounts of hydrocarbon by increasing depth in the eastern parts of Salman oil fields.

کلیدواژه‌ها [English]

  • Hydrocarbon generation potential
  • burial history
  • source rock
  • thermal modeling
  • Salman field
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