دوفصلنامه رسوب شناسی کاربردی

دوفصلنامه رسوب شناسی کاربردی

تأثیر فرآیند­های رسوبی، دیاژنزی و زمین ­ساختی در تکامل مخزن سروک در میدان سرکان، زون لرستان

نویسندگان
1 دانش‌آموخته دکترا، دانشکده زمین‌شناسی، دانشکدگان علوم، دانشگاه تهران، تهران، ایران
2 دانشیار دانشکده زمین‌شناسی، دانشکدگان علوم، دانشگاه تهران، تهران، ایران
3 استاد دانشکده زمین‌شناسی، دانشکدگان علوم، دانشگاه تهران، تهران، ایران
چکیده
شناسایی خاستگاه حفرات، بررسی ویژگی­های آن­ها و نیز شناخت از چگونگی ارتباط آن­ها با یکدیگر در فابریک رخساره­ها نقش اصلی را در تفکیک زون­های مخزنی ایفا می­کند. در این پژوهش با استفاده از داده­های مغزه، مقاطع نازک، نمودارهای الکتریکی و داده­های پتروفیزیکی در دسترس از 3 چاه موجود در میدان سرکان (چاه­های 1، 2 و3)، توالی­های سازند سروک در دو فاز میکروسکوپی و ماکروسکوپی مورد ارزیابی قرار گرفته­اند. با بررسی مخزن در سه مرحلهء جداگانه (رسوبی، دیاژنزی و زمین‌ساختی)، چگونگی تکوین و تکامل شبکه تخلخل مشخص شده و نقش هر یک از فرآیندها در شکل­گیری مخزن سروک مورد ارزیابی قرار گرفته است. با انجام مطالعات رخساره­ای، 5 رخساره شناسایی شده­اند. با ارجاع به رخساره­های استاندارد، سکوی رسوبی رمپ کم شیب برای رخساره­های این مخزن پیشنهاد گردید. به دلیل شرایط عمیق در زمان رسوب­گذاری، رخساره­ها در بیشتر موارد گل‌پشتیبان و فاقد ویژگی­های مخزنی بوده است. بررسی فرآیند­های دیاژنتیکی و نیز مطالعه شکستگی­ها در دو مقیاس کوچک و بزرگ بر مبنای مقاطع نازک (روش روابط بافتی)، مطالعات صحرایی، داده­های مغزه و اطلاعات پتروفیزیکی نشان داد که ایجاد بخش­های مخزنی توالی­های سروک در این میدان در د­رجهء نخست به سبب حضور شکستگی­های کوچک تا بزرگ مقیاس بوده و در درجهء دوم، فرآیند­های دیاژنزی به ویژه انحلال و دولومیتی­شدن، کیفیت مخزنی را افزایش داده است. در نهایت 4 سیستم منفذی موثر شامل سیستم تخلخل­ حفره­ای، سیستم تخلخل بین­بلورین، سیستم تخلخل انحلال در راستای استیلولیت و سیستم تخلخل ریز­شکستگی (مهم­ترین سیستم تخلخل مخزن سروک در میدان سرکان) مشخص گردید که میزان تولید مخزن سروک را در میدان سرکان کنترل می‌نمایند.
کلیدواژه‌ها

عنوان مقاله English

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

نویسندگان English

M. Moeini 1
V. Tavakoli 2
H. Rahimpour-Bonab 3
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
چکیده English

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.

کلیدواژه‌ها English

Pore network
Diagenesis
Reservoir qualify
Sarvak Formation
Reservoir evolution
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