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بررسی توان مخزنی سازند سروک (سنومانین-تورونین) با تاکید بر واحدهای جریانی و تعیین ارتباط آن با رخسارههای رسوبی این مخزن در یکی از میادین نفتی استان خوزستان، زاگرس چین خورده | ||
زمین شناسی کاربردی پیشرفته | ||
مقاله 15، دوره 12، شماره 4، بهمن 1401، صفحه 888-909 اصل مقاله (2.91 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22055/aag.2022.38798.2254 | ||
نویسندگان | ||
سیده اکرم جویباری1؛ پیمان رضائی* 2؛ مجید مهدی پور3 | ||
1دانشجوی دکتری رسوب شناسی و سنگ شناسی رسوبی دانشگاه هرمزگان، بندرعباس | ||
2دانشیار گروه زمین شناسی دانشگاه هرمزگان | ||
3کارشناس ارشد زمین شناسی نفت شرکت توسعه مهندسی نفت، تهران | ||
چکیده | ||
سازند سروک یکی از مخازن مهم نفتی حوضه زاگرس است. در این پژوهش برای شناسایی ریزرخساره و شرایط ته نشینی و فرآیندهای دیاژنزی تعداد 150 مقطع نازک میکروسکوپی مورد ارزیابی قرار گرفت. از داده های تخلخل و تراویی برای تعیین واحدهای جریانی و تحلیل وضعیت مخزنی با روش پتروفیزیکی لوسیا استفاده شد. مطالعه پتروگرافی منجر به شناسایی 10 ریزرخساره متعلق به کمربندهای رخساره ای لاگون، پشته کربناته، رمپ میانی و رمپ خارجی گردید که در محیط رمپ کربناته تک شیب نهشته شده اند. مهمترین فرآیندهای دیاژنزی شناسایی شده مخزن سروک شامل سیمان شدگی، انحلال، دولومیت زایی، شکستگی و استیلولیت زایی هستند. حلیل دادههای تخلخل- تراوایی با استفاده از شاخص FZI نیز منجر به شناسایی 3 واحد هیدرولیکی گردید. واحد HFU1 با ضعیفترین وضعیت مخزنی به طور عمده با رخسارههای لاگون و رمپ خارجی مشخص می شود و واحد مخزنی HFU2 و HFU3 دارای وضعیت مخزنی بهتری است و عمدتا دارای رخساره های کمربند رخساره ای لاگون، پشته کربناته و رمپ میانی هستند. بررسی وضعیت مخزنی بر مبنای تخلخل، تراوایی، شاخص کیفیت مخزن، شاخص زون جریان و توان مخزنی نشان داد وضعیت مخزنی سازند سروک در کلاس خوب تا خیلی خوب واقع می شود. همچنین برای هر کمربند رخسارهای نیز می توان بیان نمود که رخساره های لاگون و پشته کربناته دارای شاخص های مخزنی بهتری می باشند. وضعیت مخزنی متفاوت کمربندهای رخساره ای سازند سروک نشان از عملکرد توام فرآیندهای رسوبی و دیاژنزی و تاثیر پیچیده بر روی توالی مخزن و پارامترهای مخزنی آن در منطقه مورد مطالعه داشته است. | ||
کلیدواژهها | ||
ریزرخساره؛ واحد جریانی؛ توان مخزنی؛ سازند سروک؛ استان خوزستان | ||
مراجع | ||
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