کاربرد داده‌های گل‎نگاری و پارامترهای پتروفیزیکی در ارزیابی کیفیت مخزنی سازند میشریف در میدان نفتی اسفند، خلیج‌فارس

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه زمین‌شناسی، دانشکده علوم پایه، دانشگاه هرمزگان، بندرعباس، ایران

2 شرکت نفت فلات قاره، تهران، ایران

10.22078/pr.2020.4199.2905

چکیده

داده‌های گل‎نگاری حین حفاری، اطلاعات ارزشمندی برای ارزیابی کیفیت سنگ‌های مخزنی، سطح تماس سیال و تراوایی مخزن، براساس گازهای سازند ارائه می‌کنند. در این پژوهش گاز‌های همراه گل حفاری، خروجی از چاه E1P5-ST2 حفر شده در مخزن میشریف واقع در میدان نفتی اسفند، معادل بخش بالایی سروک به سن آلبین پسین- سنومانین- تورنین پیشین در ژرفای 3802 تا m 4270 با استفاده از کروماتوگرافی پیشرفته گازی ثبت شد و اندازه‌گیری پیوسته‌ای از غلظت گازهای سازند، از اجزای بسیار سبک مانند متان به اجزای سنگین مانند ترکیبات هیدروکربنی C6، C7 و C8 شامل                   n– هگزان، n- هپتان، n- اکتان، بنزن و تولوئن انجام گردید. در این راستا پس از حذف گاز پس‌زمینه و بدون در نظر گرفتن گاز تریپ، نموداری ترکیبی از مشخصه‌های حفاری، داده‌های گاز و نگار مقاومت رسم گردید و نوع سیال مخزن شناسایی و توسط نگاره‌های مقاومت تایید شد. بر این اساس، در چاه E1P5-ST2 در میدان نفتی اسفند یازده زون شناسایی گردید که زون 1 آن غیر‌تولیدی و زون‌های 4، 6، 8 و 10 دارای میانگین تخلخل مفید بالا و اشباع آب کمی هستند و به لحاظ مخزنی در وضعیت خوبی هستند، سایر زون‌ها نیز با اینکه تخلخل مفید بالایی دارند اما به‌دلیل اشباع آب، همراه با نفت متوسط تولیدی خود مقداری آب نیز تولید می‌کنند و به لحاظ مخزنی نیز ضعیف هستند. همچنین با توجه به تغییرات ROP در مقابل داده‌های گازی به‌خصوص C1 روند تغییرات تخلخل در زون‌های مخزنی مشخص گردید.
 

کلیدواژه‌ها


عنوان مقاله [English]

Tectono-sedimentary Evolution of the Maastrichtian Deposits in Western Part of Fars Area in a High Resolution Sequence Stratigraphic Framework

نویسندگان [English]

  • kiamars hosseini 1
  • Peiman rezaee 1
  • Sajad Kazem Shiroodi 2
  • Mohammad Moeini 2
1 Department of Geology, Faculty of Sciences, Hormozgan University, Bandar Abbas, Iran
2 Exploration Directorate, National Iranian Oil Company (NIOC), Tehran, Iran
چکیده [English]

In this investigation, the Maastrichtian deposits in the west of Fars area, have been studied along a NE-SW trending transect perpendicular to the Zagros. The Maastrichtian deposits in Fars area show a shallowing-up trend from pelagic marls and turbiditic facies of the Gurpi/Amiran Formations, outer-mid platform carbonates of the Tarbur Formation and restricted inner platform dolomitic/evaporitic limestones and marls of the lower Sachun Formation. On this basis, 12 facies types have been determined in 6 facies belts from basin to barrier, open and restricted lagoon and tidal flat in a carbonate rimmed shelf setting. These sedimentary facies and environments are organized in five 4th order depositional sequences. The sequence architecture shows a migrating foreland basin with a wedge-shaped geometry along the transect. The foreland basin is characterized by wedge shaped geometry and the subsiding and shallowing up depositional sequences with progradational patterns from the platform carbonate over the pelagic basinal facies.
 

کلیدواژه‌ها [English]

  • Maastrichtian
  • Foreland basin
  • Tarbur Formation
  • Gurpi Formation
  • Progradation
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