نشریه علوم زمین خوارزمی

نشریه علوم زمین خوارزمی

بررسی تأثیر فرآیندهای رسوبی و دیاژنزی بر توزیع گونه های سنگی مخزنی در مخازن کربناته: مطالعه موردی از سازند سروک در میادین فروافتادگی دزفول

نویسندگان
دانشگاه تهران
چکیده
سازند سروک یکی از مخازن مهم نفتی در نواحی جنوب و جنوب غرب ایران به شمار می رود. مطالعۀ حاضر بر پایه تلفیق نتایج بدست آمده از مطالعات پتروگرافی (رخساره و دیاژنز) با داده­های پتروفیزیکی (لاگ های چاه پیمایی) و مخزنی (تخلخل-تراوایی مغزه) به منظور بررسی عوامل کنترل کنندۀ کیفیت مخزنی در سازند سروک انجام گرفته است. استفاده از روش شاخص زون جریان (FZI) منجر به شناسایی ۱۰ واحد جریانی هیدرولیکی گردید. همچنین براساس روش لورنز ۱۲ واحد مخزنی و غیرمخزنی (تله­ای و سدی) در این سازند تفکیک گردید. در نهایت، رخساره­های غالب و فرآیندهای دیاژنزی رایج در واحدهای جریانی و واحدهای مخزنی مورد بررسی قرار گرفت. نتایج مطالعه نشان می­دهد که رخساره­های رودیستی متعلق به واریزه­های ریفی و رخساره­های دانه غالب پشته­های زیرآبی با غلبۀ فرآیندهای دیاژنز جوی نظیر انحلال گسترده، با کیفیت­ترین افق­های مخزنی را در سازند سروک پدید آورده­اند. از دیدگاه چینه نگاری سکانسی، این واحدهای مخزنی اغلب در دسته رخساره پسرونده (RST) و در زیر مرزهای ناپیوستگی (SB) ناشی از رخنمون­های قدیمه تمرکز یافته­اند. بر خلاف این، رخساره­های گل غالب، فشرده شده و سیمانی شده متمرکز در دسته رخساره پیشرونده (TST) و اطراف سطوح بیشینه سیلابی (MFS) که دور از مرزهای سکانسی قرار دارند، افق­های غیرمخزنی سازند سروک را تشکیل داده­ اند
کلیدواژه‌ها

عنوان مقاله English

Controls of depositional and diagenetic processes on the distribution of reservoir rock types in carbonate reservoirs; a case from the Sarvak Formation in the Dezful Embayment

نویسندگان English

Hamzeh Mehrabi
Javad Sobhani Foroshani
Hossain Rahimpour-Bonab
University of Tehran
چکیده English

The Sarvak Formation was deposited on shallow-marine carbonate platforms under the controls of tectonic and eustatic changes during the Upper Cretaceous in the Zagros area. It forms on of the most important reservoir intervals in SW Iran. Complex depositional setting and diagenesis history have resulted in a heterogeneous carbonate reservoir. This study, integrates the results of petrographic (facies and diagenesis) studies with petrophysical and reservoir data (core porosity-permeability and wireline logs) to evaluate the controls of depositional and diagenetic processes on the distribution of reservoir quality in the Sarvak Formation. Ten hydraulic flow units are determined using the FZI concept. Twelve reservoir and non-reservoir (baffle and barrier) units are identified using the Lorenz approach. Finally, dominant depositional facies and diagenetic alterations are evaluated in each HFU and reservoir zone. Results of this study showed that meteorically-dissolved rudist-dominated facies and high-energy facies of shoal complexes formed the best reservoir units in the Sarvak Formation. In sequence stratigraphic point of view, these zones are located in the RSTs of third-order sequences, beneath the disconformity (paleoexposure) surfaces. In contrast, the compacted and cemented mud-dominated facies concentrated in the TSTs and around the maximum flooding surfaces (MFS) formed the non-reservoir units of the Sarvak Formation.

کلیدواژه‌ها English

Sarvak formation
facies
Diagenesis
Rock Types
Hydraulic flow unit
Electrofacies
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