دوفصلنامه رسوب شناسی کاربردی

دوفصلنامه رسوب شناسی کاربردی

فاکتورهای مؤثر زمین­ شناسی (دیاژنز و تکتونیک) در تغییرات ویژگی‌های مخزنی: مثالی از سازندهای آسماری و شهبازان، زاگرس، شمال شرق صفحه عربی

نویسندگان
1 دانشجوی دکترا، گروه حوضه‌های رسوبی و نفت، دانشکده علوم‌زمین، دانشگاه شهید بهشتی، تهران، ایران
2 استاد گروه حوضه‌های رسوبی و نفت، دانشکده علوم‌زمین، دانشگاه شهید بهشتی، تهران، ایران
3 شرکت ملی مناطق نفت خیز جنوب، اهواز، ایران
چکیده
این مطالعه با هدف بررسی فرایندهای دیاژنزی و تاثیر تغییرات تکتونیکی در طول زمان و نقش آن در کیفیت مخزنی در سازندهای آسماری-شهبازان انجام شده است. برای این هدف سه برش سطحی در پهنه لرستان و دو برش زیر سطحی در فروافتادگی دزفول انتخاب شد. مطالعات زیست­چینه‌ای سازند آسماری در شمال شرق فروافتادگی دزفول و در لرستان حاکی از سن این سازند به ترتیب به سن الیگوسن تا میوسن پیشین و میوسن پیشین است. لازم به ذکر است که سن قاعده سازند آسماری از فروافتادگی دزفول به سمت لرستان جوان­تر شده است. سازند شهبازان دارای سن ائوسن میانی و بخشی ار ائوسن پسین و متشکل از توالی کربناته می‌باشند. پسروی دریا (بسته شدن تتیس) و بالاآمدگی تکتونیکی (برخورد پلیت عربی) سبب شده ایـن سازند شهبازان دو مرحله از ائـوژنز تا تلوژنزرا طی کند. 1- نهشت توالی کربناته در ائوسن، پسروی (متاثر از فازکوهزایی آلپی میانی در ائوسن پسین)، بالاآمدگی و انحلال 2- پیشروی دریا در میوسن (در برش‌های سطحی) و نهشت سازند آسماری دیاژنز تدفینی و برخورد نهایی و بالاآمدگی در فاز آلپی پایانی می‌باشد. مهمترین فرایندهای دیاژنزی توالی مورد مطالعه شامل دولومیتی شدن، سیمانی شدن، میکریتی شدن، فشردگی، و انحلال بوده که در محیط ائوژنز، مزوژنز و تلوژنز رخ داده است. بررسی­ها حاکی از تاثیر فرایندهای دیاژنزی بر کیفیت مخزنی در طول زمان است. تأثیر متقابل فرایندهای دیاژنزی در افزایش یا کاهش ویژگی‌های مخزنی کاملا مشخص است. دولومیتی شدن شایع‌ترین فرایندها در منطقه مورد مطالعه بویژه سازند شهبازان می‌باشد. از بین فرآیندهای دیاژنزی انحلال و دولومیتی شدن مهمترین نقش را در افزایش کیفیت مخزنی داشته­اند، سیمانی شدن و تراکم مهمترین عامل کاهش کیفیت مخزنی هستند.
کلیدواژه‌ها

عنوان مقاله English

Effective geological factors (diagenesis and tectonics) in changes in reservoir characteristics: An example from the Asmari and Shahbazan Formations, Zagros, NE. Arabian plate

نویسندگان English

M. R. Nuraeinezhad 1
M. H. Adabi 2
A. Sadeghi 2
A. R. Bavi Oveidi 3
1 Ph. D. student., Dept., of Sedimentary Basins and Petroleum, Faculty of Earth Sciences, Shahid Beheshti University, Tehran, Iran
2 Prof., Dept., of Sedimentary Basins and Petroleum, Faculty of Earth Sciences, Shahid Beheshti University, Tehran, Iran
3 National Iranian South Oil Company, Ahvaz, Iran
چکیده English

This study aimed to investigate diagenetic processes and effects tectonic variations during time and its role in reservoir quality in the Asmari-Shahbazan formations. In this research examined two subsurface sections in the Dezful Embayment and three outcrops in the Lorestan area to examine the of tectonic activity and on reservoir quality. Base on biostratigraphy study, in Lorestan, the Asmari carbonate Formation belongs to the Early Miocene, but in the northeast of the Dezful Embayment, it belongs to the Oligocene to Early Miocene. The Shahbazan Formation is primarily composed of carbonate strata and ranges from the Middle to Late Eocene. According to research, from the Dezful Embayment to Lorestan, the base of the Asmari Formation becomes younger. With dolomitization being the most common activity in the Shahbazan Formation, this study also discovered that diagenetic processes significantly affect reservoir quality over time. Diagenetic processes have overprinted on reservoir quality by either enhancing or reducing their properties. Cementation, micritization, compaction, and dissolution are the primary processes. Eogenesis, mesogenesis, and telogenesis are the three settings in which these activities occur. Cementation and compaction are the main elements that reduce reservoir quality, whereas dissolution and dolomitization are the most significant activities that improve it. Because of tectonic uplift (collision Arabian plate) and marine retreat (Tethys closed), the Shahbazan Formation has undergone two stages of development, from eogenesis to telogenesis: 1. The first stage, which was characterized by regression, elevation, and dissolution, involved retrogressive deposition during the Pyrenean orogenic period. 2. Progradation and deposition of the Asmari layer, burial diagenesis, and collision and uplift comprised the second stage.

کلیدواژه‌ها English

Diagenesis
Tectonics
Reservoir quality
Asmari
Shahbazan
Arabian Plate
Tethys
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  • تاریخ دریافت 18 تیر 1404
  • تاریخ بازنگری 23 مهر 1404
  • تاریخ پذیرش 03 آبان 1404