شناسایی و تفسیر رخساره‌های رسوبی و دیاژنزی از طریق مفهوم رخساره لاگ‌ها، مطالعه موردی از مخزن سروک در یکی از میادین بزرگ نفتی جنوب غرب ایران

اسعدی, علی; هنرمند, جواد; رحمانی, علی; رئیسی, علیرضا

شناسایی و تفسیر رخساره‌های رسوبی و دیاژنزی از طریق مفهوم رخساره لاگ‌ها، مطالعه موردی از مخزن سروک در یکی از میادین بزرگ نفتی جنوب غرب ایران

نوع مقاله : مقاله پژوهشی

نویسندگان

¹ پژوهشگاه صنعت نفت، پردیس صنایع بالادستی، پژوهشکده علوم زمین، تهران

² مدیریت برنامه‌ریزی تلفیقی شرکت نفت ایران، تهران

چکیده

رخسارههای رسوبی و فرآیندهای دیاژنزی عمدتا توسط مطالعات دقیق پتروگرافی و توصـیف مغزهها و رخـنمونها شـناسایی و تفسـیر میشوند. تمرکز این تحقیق، بر شناسایی رخسارههای رسوبی و دیاژنزی از طریق مفهوم رخساره لاگها در بخش مخزنی سازند سروک در یکی از میادین بزرگ ناحیه دشت آبادان واقع در جنوبغرب ایران میباشد. به منظور رسیدن به این هدف، از یک رویکرد سه مرحله به صورت زیر استفاده شده است. ابتدا مطالعه مقاطع نازک میکروسکوپی و توصیف مغزهها به منظور شناسایی فرآیندهای رسوبی و دیاژنزی در یک چاه کلیدی با 260 متر مغزه و 760 مقطع نازک میکروسکوپی صورت گرفته است. آنالیز رخسارهای منجر به شناسایی 12 میکروفاسیس در شش کمربند رخسارهای لاگون، شول، رودیست بایوستروم، شیب حوضه و بخش کم عمق و عمیق دریای باز گردید. بر اساس این نتایج به نظر میرسد که توالی مورد مطالعه، در یک پلاتفرم شلف کربناته نهشته شده است. فرآیندهای دیاژنزی شامل میکرایتی شدن، زیست آشفتگی، تبلور مجدد، سیمانی شدن، انحلال، تراکم و شکستگی توالی سازند سروک را پس از نهشته شدن تحت تاثیر قرار داده است. در این مطالعه به منظور مقایسه بهتر توزیع فرآیندهای دیاژنزی و رخساره لاگها، رخسارههای دیاژنزی معرفی شده است. سه رخساره دیاژنزی منطبق بر توالیهای با انحلال و سیمانی شدن پایین (رخساره 1)، انحلال بالا (رخساره 2) و سیمانی شدن بالا (رخساره 3) معرفی گردیده است. سپس پنج رخساره لاگ توسط روش خوشهبندی سلسله مراتبی شناسایی شد. مقایسه نتایج توزیع رخساره لاگها با تغییرات رخسارهای و دیاژنزی، انطباق بالای بین ناهمگنیهای زمینشناسی با ویژگیهای پتروفیزیکی را نشان داد. در نهایت در چاههای فاقد مغزه پس از مشخص شدن ارتباط توزیع رخساره لاگها با رخسارههای رسوبی و دیاژنزی، این پارامترهای مهم زمینشناسی شناسایی شده است. رویکرد مورد استفاده در این مطالعه در نشان دادن ناهمگنیهای رخسارهای و دیاژنزی مخزن سروک در میدان مورد مطالعه کارآمد میباشد.

کلیدواژه‌ها

عنوان مقاله [English]

Recognition and interpretation of depositional and diagenetic facies from log facies concept, a case study from the Sarvak reservoir in a giant oil fields, SW Iran

نویسندگان [English]

A. Assadi ¹
J. Honarmand ¹
A. Rahmani ²
A.R. Raisi ²

چکیده [English]

Depositional facies and diagenetic features are usually understood by their detailed petrographic studies and core or outcrop description. This study focuses on identification and interpretation of depositional and diagenetic facies from log facies concept in the Sarvak reservoir of a giant oil fields of the Abadan Plain, SW Iran. In order to achieve this, three step approach is used. Firstly core description and thin section study were carried out to determine sedimentary and diagenetic processes in one studied key well with 265 m core and 760 thin-sections. Facies analysis led to the recognition of 12 microfacies representing six facies belts, which are lagoon, shoal, rudist biostrome, slope, proximal and distal open marine. According to the results, it seem that studied interval have been deposited in a carbonate shelf platform. Diagenetic processes include micritization, bioturbation, recrystallization, cementation, dissolution, compaction and fracturing have been affected the Sarvak reservoir after deposition. In this study we introduced diagenetic facies as a method for effective comparison between diagenetic alterations and log facies distribution. Three diagenetic facies were recognized that coincide with intervals with low cementation and dissolution (facies 1), high dissolution (facies 2) and high cementation (facies 3). Secondly, five log facies were identified by hierarchical clustering method. The number of clusters were determined based on dendrogram tree and geological heterogeneity. Comparing the results of log facies distribution with depositional and diagenetic changes, show a good agreement between geological and petrophysical heterogeneity. Finally, identification of depositional facies belts and diagenetic facies after calibration of log facies with this geological properties, were carried out in un-cored wells by log facies approach. The presented approach in this study is effective in highlighting main depositional and diagenetic heterogeneity of the Sarvak reservoir in studied field.

کلیدواژه‌ها [English]

Sarvak reservoir
Abadan Plain
depositional facies
diagenetic facies
log facies

مراجع

منابع

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