فرایندهای دیاژنز و تأثیر آن بر کیفیت مخزنی سازند ایلام، میدان نفتی ماله‌کوه، شمال‌باختری اندیمشک

نوع مقاله: مقاله پژوهشی

چکیده

سازند ایلام سنگ مخزن میدان نفتی ماله‌کوه در زون چین‌خورده ـ رورانده زاگرس در منطقه لرستان واقع است. بیشتر رخساره‌های این سازند گل‌پشتیبان و از مادستون تا وکستون در تغییر است. از مهمترین فرایند‌های دیاژنز در این سازند می‌توان به فشردگی (مکانیکی و شیمیایی)، نئومورفیسم افزایشی، انواع جانشینی (پیریتی‌شدن، دولومیتی‌شدن، سیلیسی‌شدن و گلوکونیتی‌شدن)، سیمانی‌شدن، چند نسل شکستگی‌ها و انحلال تدفینی اشاره کرد. فراوان‌ترین انواع تخلخل‌ها از نوع قالبی، حفره‌ای، استیلولیتی، بین‌بلوری و درون‌دانه‌ای است. توالی پاراژنتیکی سازند ایلام نشان‌دهنده تأثیر مجموعه‌ای از فرایندهای دیاژنزی هم‌زمان با رسوب‌گذاری در کف دریا و پس از رسوب‌گذاری در طی دفن کم‌عمق تا عمیق و بالاآمدگی است. ترسیم نمودار داده‌های تخلخل و تراوایی مغزه برای انواع رخساره‌ها در این میدان نشان می‌دهد که رخساره‌ها از کیفیت مخزنی پایینی برخوردار بوده و فرایندهای دیاژنزی تاثیر مهمی در افزایش کیفیت مخزنی نداشته و تنها در برخی از موارد تشکیل استیلولیت و شکستگی موجب افزایش تراوایی شده‌ است.

کلیدواژه‌ها


عنوان مقاله [English]

Diagenetic Processes and their Effect on the Reservoir Quality of Ilam Formation, Maleh-Kuh Oilfield, NW Andimeshk

چکیده [English]

Ilam Formation is the reservoir rock of Maleh-Kuh oilfield located in folding-thrusting Zagros zone in Lurestan province. It is mainly composed of mud-supported lithofacies varying from mudstone to wackestone. The most important identified diagenetic processes are compaction (physical and chemical), aggrading neomorphism, different replacement (pyritization, dolomitization, glauconitization and silicification), cementation, several generations of fracture, and burial dissolution. The main recognized pore types are moldic, vuggy, stylolitic, intercrystalline, and intragranular. Paregenetic sequence interpretation of Ilam Formation indicates that a set of diagenetic processes such as syndepositional diagenesis in marine environment, as well as post-depositional shallow to deep burial diagenesis, and uplift have affected this reservoir rock. Porosity and permeability data plots show that these facies have very low reservoir quality and most diagenetic processes have not had a major effect on increasing reservoir quality, and, only in some cases, permeability has been increased by stylolitization and fracturing.

کلیدواژه‌ها [English]

  • Ilam Formation
  • Maleh-Kuh Oilfield
  • Diagenetic Processes
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