تحلیل هندسی چین و مقادیر کمی واتنش با استفاده از مقاطع لرزه ای تراز شده (مطالعه موردی میدان نفتی کوپال)
محورهای موضوعی : شاخه های دیگر علوم زمین در ارتباط با زمین شناسی نفتبابک سامانی 1 * , یعقوب جلیلی 2 , نگار ملایی 3
1 - دانشکده علوم زمین دانشگاه شهید چمران اهواز
2 - گروه زمین شناسی، دانشکده علوم زمین، دانشگاه شهید چمران اهواز
3 - گروه زمین شناسی، دانشکده علوم زمین، دانشگاه شهید چمران اهواز
کلید واژه: مقطع لرزه ای, مقطع تراز شده, نسبت ابعادی چین, نسبت واتنش, درصد کوتاه شدگی,
چکیده مقاله :
در این پژوهش با استفاده از مقاطع لرزهای تفسیر شده، به بررسی ماهیت هندسی چین و مقادیر کمی واتنش در افق کربناته آسماری در میدان نفتی کوپال پرداخته شده است. بدین منظور تعداد سیزده مقطع لرزهای از میدان نفتی کوپال مورد ارزیابی قرار گرفت. با استخراخ افق کربناته آسماری از هر مقطع لرزه ای، دادههای اولیه جهت بررسی هندسی سبک چین و تحلیلهای واتنش آماده گردید. بررسی عناصر سبک چین در افق آسماری میدان نفتی کوپال نشان دهنده یک چین نامتقارن با زاویه بین یالی 110 تا 147 درجه (چین ملایم تا باز) و نسبت ابعادی 15/0 تا 38/0 (چین وسیع تا پهن) و نسبت تیزی 45/0 تا 7/0 (چین نیمه مدور) می باشد. به منظور تعیین مقادیر کوتاه شدگی و مقادیر نسبی واتنش با به کارگیری هوش مصنوعی، هر یک از مقاطع لرزهای تراز شد و مقادیر طول اولیه افق آسماری تعیین گردید. نتایج نشان دهنده مقادیر کوتاه شدگی متفاوت در بخشهای مختلف تاقدیس میباشد. مقادیر کوتاه شدگی در محدوده 67/2 تا 65/8 درصد و مقادیر نسبت واتنش در محدوده 05/1 تا 19/1 محاسبه گردید.
In this study, using interpreted seismic profiles, the geometric nature of folding and quantitative strain values in the Asmari carbonate horizon in the Kupal oil field have been investigated. For this purpose, thirteen seismic profiles from the Kupal oil field were evaluated. By extracting the Asmari carbonate horizon from each seismic profile, initial data were prepared for geometric investigation of the fold style elements and strain analyses. Examination of fold style elements in the Asmari horizon of the Kupal oil field indicates an asymmetric fold with an interlimb angle of 110 to 147 degrees (gentle to open fold), an aspect ratio of 0.15 to 0.38 (broad to wide fold), and a bluntness ratio of 0.45 to 0.7 (sub rounded fold). In order to determine the values of shortening and relative values of strain using artificial intelligence, each of the seismic profiles was balanced and the values of the initial length of the Asmari horizon were determined. The results show different shortening values in different parts of the anticline. The shortening values were calculated in the range of 2.67 to 8.65 percent and the strain ratio values in the range of 1.05 to 1.19.
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