بررسی کیفیت مخزنی سازند سروک با استفاده از آنالیز خوشه ای گرافیکی و مقایسه آن با داده های پتروگرافی در یکی از میدان های نفتی فروبوم دزفول
محورهای موضوعی : زمین شناسی نفت
سیده اکرم جویباری
1
*
,
پيمان رضائي
2
,
مجید مهدی پور
3
1 - دکتری رسوب شناسی و سنگ شناسی رسوبی دانشگاه هرمزگان، بندرعباس
2 - دانشیار گروه زمین شناسی دانشگاه هرمزگان، بندرعباس
3 - کارشناس ارشد زمین شناسی نفت شرکت توسعه مهندسی نفت، تهران
کلید واژه: کیفیت مخزنی, آنالیز خوشه ای گرافیکی, سازند سروک, پتروگرافی ,
چکیده مقاله :
سازند سروک یکی از مخازن مهم کربناته در فرو بوم دزفول است. به منظور ارزیابی کیفیت مخزنی این سازند در یکی ازمیدان های فروبوم دزفول از روش آنالیز خوشه ای گرافیکی و مقایسه با یافته های پتروگرافی استفاده گردید. یافته ها نشان داد که سازند سروک در میدان مورد مطالعه از 8 ریزرخساره متعلق به زیرمحیط های لاگون، پشته کربناته، رمپ میانی و رمپ خارجی که در یک محیط رمپ تک شیب نهشته شده اند تشکیل شده است. عمده فرآیندهای دیاژنزی موثر بر این مخزن، شامل سیمانی شدن، انحلال، شکستگی، استیلولیتی شدن و دولومیتی شدن هستند. نتایج آنالیزخوشه ای گرافیکی منجر به شناسایی 3 رخساره الکتریکی گردید که رخساره EF1 ضعیف ترین پارامترهای مخزنی و رخساره EF3 بهترین وضعیت مخزنی را به خود اختصاص دادند. عمده ریزرخساره های EF1 ریزرخساره های گرینستونی و عمده ریزرخساره های EF3 منطبق بر ریزرخساره های وکستونی و پکستونی بوده است. بر این اساس به نظر می رسد زیرمحیط لاگون نسبت به سایر زیرمحیط ها به خصوص پشته کربناته از وضعیت مخزنی بهتری برخوردار می باشد و این مهم نشانه عملکرد متفاوت فرآیندهای دیاژنزی در این زیر محیط ها می باشد. در یک روند قائم نیز بیشترین حجم ستون هیدروکربنی در ستبرای رخساره الکتریکی EF3 و کمترین منطبق بر EF1 است این مهم حاکی از صحت و دقت رخساره های الکتریکی شناسایی شده است به منظور ارزیابی کیفیت مخزنی می باشد. درمجموع می توان بیان نمود که استفاده از آنالیز خوشه ای گرافیکی و مقایسه با یافته های پتروگرافی راهکار مناسبی برای ارزیابی دقیق از کیفیت مخزنی مخازن کربناته است.
Sarvak Formation is one of the important carbonate reservoirs in Dezful Embayment. In order to evaluate the reservoir quality of this formation in one of the Dezful Embayment fields, multi-resolution graph-based method was used and compared with petrographic findings. The findings showed that the Sarvak formation in the studied field consists of 8 microfacies belonging to the sub-environments of the lagoon, carbonate bar, middle ramp and outer ramp, which were deposited in a homoclinal ramp environment. The main diagenesis processes affecting this reservoir include cementation, dissolution, fracture, stylolitization, and dolomitization. The results of multi-resolution graph-based analysis led to the identification of 3 electrofacies, EF1 electrofacies had the weakest reservoir parameters and EF3 facies had the best reservoir status. The majority of EF1 microfacies are grainstone microfacies and the majority of EF3 microfacies correspond to wackstone and packstone microfacies. Based on this, it seems that the lagoon sub-environment has a better reservoir condition than other sub-environments, especially the carbonate bar, and this is an important sign of the different performance of diagenesis processes in these sub-environments. In a vertical trend, the highest volume of hydrocarbon column is in the EF3 electrofacies and the lowest is EF1. In general, it can be stated that the use of multi-resolution graph-based analysis and comparison with petrographic findings is a suitable solution for accurate evaluation of the reservoir quality of carbonate reservoirs.
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