شناسایی توزیع شکستگی‌ها و تعیین تنش‌های برجای افقی در یکی از میادین نفتی خلیج فارس با استفاده از نگار تصویری FMI

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار دانشکده علوم زمین دانشگاه صنعتی شاهرود

2 دانشکده علوم زمین، دانشگاه صنعتی شاهرود، شاهرود ایران

3 دانشکده علوم زمین،دانشگاه صنعتی شاهرود

4 کارشناسی ارشد دانشکده معدن، نفت و ژئوفیزیک، دانشگاه صنعتی شاهرود

چکیده

در مخازن هیدروکربوری سازندهای سخت، استخراج هیدروکربور و توسعه میدان به شدت به شرایط ژئومکانیکی مخزن مانند وضعیت شکستگی‌ها و گسل‌های موجود و شرایط تنش‌های برجا، وابسته است. لاگ‌های تصویری ابزار قدرتمندی هستند که در چند ده اخیر برای ارزیابی شرایط ژئومکانیکی مخازن هیدروکربوری به کار گرفته شده‌اند. در این پژوهش با استفاده از لاگ تصویری FMI که قدرت تفکیک، درصد پوشش و دقت بسیار بالای دارد، وضعیت انواع شکستگی، گسل و شرایط تنش برجا در سازند عرب بالایی در یکی از میادین خلیج فارس مورد بررسی قرار گرفت. بر این اساس تعداد 206 شکستگی باز درغالب ده زون خرد شده با روند N60E-S60W و 96 شکستگی بسته با دو روند N45W-S45E , N50E-S50W در سازند عرب بالایی چاه Aتشخیص داده شد که عمدتا از نوع شکستگی‌های طولی بودند. همچنین بر اساس شکستگی‌های القایی و ریزش جداره چاه مشاهد شده، راستای تنش‌های افقی حداکثر و حداقل به ترتیبN50E-S50W و N40E-S40W بدست آمد..

کلیدواژه‌ها

عنوان مقاله [English]

Determination of fractures distribution and horizontal insitu stress in one of the Persian Gulf oil fields using FMI image log

نویسندگان [English]

  • Aliakbar Momeni 1
  • sara Gholami 2
  • Ramazan Ramazani-Omali 3
  • Mina Shafiabadi 4
1 faculty of earth sciences, Shahrood University of Technology, Shahrood, Iran
2 faculty of earth sciences, Shahrood University of Technology, Shahrood, Iran
3 Shahrood University of Technology, Shahrood, Iran
4 MSc. In petroleum engineering, Faculty of Mining, Petroleum & Geophysics Engineering, Shahrood University of Technology, Shahrood, Iran
چکیده [English]

In hydrocarbon reservoirs of hard formations, hydrocarbon extraction and field development are strongly dependent on the geomechanical conditions of the reservoir, such as fractures and faults status and in-situ stress conditions. Image logs are powerful tools used to evaluate geomechanical conditions of hydrocarbon reservoirs in recent decades. In this study, using the FMI image log, which has a high resolution, coverage percentage and accuracy, the status of fractures, faults, and in-situ stress conditions of the upper Arab Formation in one of the Persian Gulf oil fields were investigated. Accordingly, 206 open fractures in 10 crashed zone with N60E-S60W domain trend and 96 closed fractures with two N45W-S45E and N50E-S50W trends in the Upper Arab Formation of well A were detected and based on the orientation, they mainly were categorized in longitudinal tensile fracture. Also, based on the observed induced fractures and breakouts, maximum and minimum horizontal stresses are oriented in N50E-S50W and N40W-S40E directions, respectively

کلیدواژه‌ها [English]

  • Fractures
  • FMI image log
  • in situ stresses
  • induced fractures
  • breakout

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  • تاریخ دریافت: 03 شهریور 1400
  • تاریخ بازنگری: 30 اردیبهشت 1401
  • تاریخ پذیرش: 04 بهمن 1400

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