تفسیر محیط رسوبی، دیاژنز و کیفیت مخزنی سازند تیرگان به عنوان سنگ مخزن احتمالی در خاور حوضه رسوبی کپه داغ

نویسندگان

1 گروه زمین‌شناسی، دانشگاه آزاد اسلامی، واحد مشهد، مشهد

2 گروه زمین‌شناسی، دانشگاه آزاد اسلامی، واحد شاهرود، شاهرود

10.22084/psj.2019.16424.1173

چکیده

در این مطالعه سازند تیرگان با سن بارمین- آپسین زیرین، در دو منطقه رادکان و گلیان، در حوضه رسوبی کپه­داغ مورد مطالعه قرار گرفته است، که بدین منظور تعداد 57 نمونه سنگی جهت مطالعات پتروگرافی و تعیین میزان تخلخل و هم­چنین 15 نمونه جهت تعیین تراوایی تهیه شده­اند. اهداف این مطالعه، تفسیر محیط رسوب­گذاری، شناسایی تاریخچه دیاژنتیکی و در نهایت ارزیابی ویژگی­های مخزنی است. بر اساس مطالعات صحرایی و میکروسکوپی چهار مجموعه رخساره­های سنگی کربناته شناسایی شده است. بیش­تر سنگ­های کربناته در محیط­های دریای باز، سدی، لاگون و پهنه­های جزر و مدی ته­نشست نموده­اند. با استفاده از داده­های سنگ­شناسی، فرآیندهای اصلی دیاژنتیکی موثر بر این سنگ­ها شامل میکریتی شدن، سیمانی شدن، نئومورفیسم، فشردگی، شکستگی، انحلال، سیلیسی شدن و دولومیتی شدن است، که بر اساس فرآیندهای دیاژنتیکی شناسایی شده، دیاژنز اولیه، دفنی عمیق و بالاآمدگی اتفاق افتاده است. در این سنگ­ها شکستگی، تخلخل­های بین­بلوری، بین­ذره­ای و درون­دانه­ای مهم­ترین نوع تخلخل بشمار می­روند. در نهایت، میانگین تخلخل در برش رادکان 31/8 درصد و در برش گلیان 28/4 درصد، هم­چنین میانگین تراوایی در برش رادکان 574/0 میلی­دارسی و در برش گلیان 212/0 میلی­دارسی برآورد شده است. بنابراین، سازند تیرگان در گستره، قابلیت مخرنی مطلوبی ندارد.

کلیدواژه‌ها


عنوان مقاله [English]

The interpretation of depositional environment, diagenesis and reservoir quality of Tirgan Formation, a possible reservoir rock in the eastern of Kopet-Dagh Basin

نویسندگان [English]

  • Mehdi Reza Poursoltani 1
  • Hessam Kermanshahi 2
  • Mohammad Javanbakht 1
چکیده [English]

In this research, the Tirgan Formation, Barremian-Lower Aptian in age, has been studied at two areas, Radkan and Geliyan, in the Kopet-Dagh Basin. Lab was focused on 57 samples for petrographic and porosity studies and 15 samples for estimation of permeability. The objectives of this study are depositional environment interpretation, recognition of diagenetic history, and estimation of porosity and permeability. Based on field and laboratory studies four facies associations are recognized. Most of the carbonate rocks were deposited in an open marine, barrier, lagoon and tidal flat setting. Using petrographic results, the main diagenetic processes that affected these rocks are micritization, cementation, neomorphism, compaction, fracturing, dissolution, silicification, and dolomitization, with eodiagenetic, mesodiagenetic and telodiagenetic effects evident. Fracturing, intercrystalline, interparticle and intraparticle porosity are the main types. The average porosity and permeability at Radkan are 8.31% and 0.574 md, and at Geliyan 4.28% and 0.212 md. Based on these results, the Tirgan Formation does not appear to have reservoir capability in the region.

کلیدواژه‌ها [English]

  • Tirgan Formation
  • Kopet-Dagh basin
  • Barmian-Aptian
  • diagenese
  • porosity
  • permeability

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