ریز رخساره، محیط رسوبی و دیاژنز سازند آسماری در میدان نفتی چهاربیشه جنوب غرب ایران

نوع مقاله : علمی -پژوهشی

نویسندگان

1 کارشناس ارشد رسوب شناسی، دانشکده علوم زمین، دانشگاه شهید بهشتی

2 استاد دانشکده علوم زمین، دانشگاه شهید بهشتی

10.29252/esrj.9.4.86

چکیده

در این پژوهش سازند آسماری در دو مقطع تحت­الارضی به نام­های چاه­ شماره 2 و شماره 3 میدان نفتی چهاربیشه به ترتیب با ضخامت­های 423 و 412 متر مورد بررسی قرار گرفته است. سازند آسماری در این میدان از تناوبی از لایه­های سنگ آهک و دولومیت همراه با لایه­های بسیار نازک شیل و میان لایه­های انیدریت تشکیل شده است. بر اساس مطالعات پتروگرافی و شناسایی ریز رخساره­ها، تعداد 15 ریز رخساره و 1 لیتوفاسیس در قالب 4 کمربند رخساره­ای پهنه جزرومدی، لاگون، سد و دریای باز برای سازند آسماری معرفی و محیط رسوبی این سازند، پلاتفرم کربناته از نوع رمپ هم شیب (هموکلاین) تعیین گردیده است. از فرایندهای دیاژنزی تاثیرگذار می­توان سیمانی­شدن، تراکم (فیزیکی و شیمیایی)، انحلال، تخلخل­های اولیه و ثانویه، فابریک ژئوپتال، نئومورفیسم افزایشی، جانشینی (دولومیتی­شدن، آهن­دار شدن و سیلیسی شدن)، میکریتی­شدن و بورینگ را بیان کرد که در قالب هر سه محیط دیاژنزی متائوریکی، دریایی و تدفینی، سازند آسماری را تحت تاثیر قرار داده­اند.

کلیدواژه‌ها


عنوان مقاله [English]

Microfacies, sedimentary environment and diagenesis of the Asmari Formation in Chahar Bisheh Oil Field, south west of Iran

نویسندگان [English]

  • Asiyeh Yousefi Hajivand 1
  • Mohammad Hoseyn Adabi 2
  • Abbas Sadeghi 2
1 M.Sc in Sedimentology, School of Earth Sciences, Shahid Beheshti University
2 Professor, School of Earth Sciences, Shahid Beheshti University
چکیده [English]

In this research, two subsurface  sections consist of well No.2 and No.3 from the Asmari Formation with a thickness of 423 and 412 m respectively in Chahar Bisheh oil Field have been studied. The Asmari Formation in this field consists of intermittent layers of limestone and dolomite, very thin shale layers and anhydrite interlayers. Based on petrographic studies and identification of microfacies, 15 microfacies and 1 lithofacies in 4 facies belts consist of tidal flats, lagoon, shoal and open marine for the Asmari Formation have been recognized and sedimentary environment of this formation, is a Homocline ramp carbonate platform. Effective diagenetic processes including cementation, dolomitization, compaction, fracturing, dissolution, micritization, pyritization, geopetal fabric, boring, silicification and neomorphism which has influenced the Asmari Formation by all three marine, meteoric and burial diagenetic environments.

کلیدواژه‌ها [English]

  • Diagenesis
  • Asmari Formation
  • Sedimentary environment
  • Microfacies
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