رخساره ها و فرآیندهای دیاژنزی و تاثیر آن ها بر توزیع ویژگی های پتروفیزیکی و کیفیت مخزنی سازند آسماری در میدان نفتی گچساران

نوع مقاله: مقاله پژوهشی

نویسندگان

گروه زمین‌شناسی، دانشکده علوم پایه، دانشگاه فردوسی مشهد

چکیده

سازند آسماری در میدان نفتی گچساران از تنوع سنگ­شناسی کمی برخوردار است به گونه­ای که در بخـش­های پایین سنگ­آهک و در بخش­های بالایی مخزن عمدتا از دولومیت تشکیل شده است. هدف از این پژوهش شناسایی رخساره­ها، محیط­رسوبی، فرآیندهای دیاژنتیکی و تاثیر آن­ها بر کیفیت مخزنی این سازند است. براین پایه، بررسی میکروسکپی شمار 478 برش نازک تهیه شده از مغزه منجر به شناسایی 11 رخساره شد که در سه کمربند رمپ درونی (پهنه کشندی، لاگون و سد)، میانی و بیرونی برجای گذاشته شده است. در این پژوهش فرایندهای دیاژنزی میکرایتی­شدن، آشفتگی زیستی، نوریختی، فشردگی، انحلال، سیمانی شدن و جانشینی نیز شناسایی شد. برای بررسی ویژگی­های مخزنی از کارکرد فرایندهای دیاژنزی و رسوب­شناسی بر چگونگی توزیع داده­های تخلخل و تراوایی استفاده شد. برپایه آن، دولستون با تخلخل حفره­ای- میان­بلوری، وکستون/ دولووکستون با تخلخل حفره­ای- کانالی و پکستون­های دانه­پشتیبان متخلخل بهترین رخساره­های مخزنی در قیاس با دیگر رخساره­ها در سازند آسماری شناخته شد.

کلیدواژه‌ها


عنوان مقاله [English]

Facies and diagenetic processes and it effect on distribution of petrophysical properties on reservoir quality of the Asmari Formation in Gachsaran Oil Field

نویسندگان [English]

  • m farshi
  • R. Moussavi-Harami
  • a mahboubi
  • M. Khanehbad
چکیده [English]

The Asmari Formation in Gachsaran oil field has a low lithological diversity and including of limestone in the lower parts and dolostone in the upper parts of the reservoir. The goal of this study is determination of facies, depositional environment, diagenetic processes and their effect on the reservoir quality of this formation. Microscopic studies of 478 thin sections of cores led to the identification of 11 microfacies belong to 3 facies belts including inner (tidal flat, lagoon, shoal), middle and outer ramps. This study also revealed diagenetic processes including micritization, bioturbation, neomorphism, compaction, dissolution, cementation and replacement. In order to investigation of reservoir characterization, the effects of diagenetic processes and sedimentology used on the distribution of porosity and permeability. Based on the results, dolostones with intercrystaline-vuggy porosity, wackeston/dolowackestone with vuggy-channel porosity and Porous grain-dominated Packstone are the best reservoir facies comparsion with other facies in the Gachsaran oil field. Key words: Asmari Formation, Gachsaran Oil Field, depositional environment, diagenesis, Reservoir quality.

کلیدواژه‌ها [English]

  • Key words: Asmari Formation
  • Gachsaran Oil Field
  • Depositional environment
  • Diagenesis
  • reservoir quality

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