اهميت مطالعات ژئوشيمي سطحي در اکتشافات ذخاير هيدروکربني: با ذکر مطالعه موردي در استان خوزستان، جنوب غرب ايران
الموضوعات : زمین شناسی نفتزینب علیزاده 1 , بهمن سلیمانی 2 , بهزاد خانی 3
1 - گروه زمین شناسی نفت و حوضه¬های رسوبی، دانشگاه شهید چمران اهواز، اهواز
2 - استاد گروه زمين شناسي نفت و حوضه¬هاي رسوبي، دانشگاه شهيد چمران اهواز، اهواز، ايران
3 - مدیر فنی شرکت انرژی پژوهان آریانا، اهواز
الکلمات المفتاحية: ژئوشیمی سطحی, ریزنشت, فروافتادگی دزفول, آنالیز میکروبی, گاز خاک جذب شده,
ملخص المقالة :
مطالعات ژئوشيمي سطحي از ابزارهاي مهم در تمام مراحل اکتشاف پتانسيل هيدروکربني از شناسايي حوضه پيشاني (فورلند) تا اکتشاف دقيق، و چشمانداز بر اساس شار احتمالي هيدروکربنها، شناسايي زونهاي فرعي در ميادين بالغ، نظارت بر زهکشي هيدروکربنهاي مرتبط با توليد در طول زمان بشمار مي رود. در مطالعه کنوني، پيش بيني پتانسيل هيدروکربني ناحيهاي در شمال شرق خوزستان (جنوب شرق فروافتادگي دزفول) با استفاده از آناليز گاز خاک نمونه هاي جمع آوري شده (تعداد 62 نمونه) انجام شده است. سنجش مقادير گازخاک با استفاده از روشهاي استخراج اسيد (AE) و بررسي ميکروبي و استخراج ژن آنها (MT1-MT2) است. تحليل دادهها نشان داد که تغييرات پارامترهاي آناليز MT2 در امتداد خطوط نمونه برداري در نمودارهاي هيستوگرامي کج شدگي مثبت را بواسطه وجود آنومالي ژئوشيمي سطحي و حضور هيدروکربن در مخازن احتمالي نشان ميدهد. نسبتهاي اتان در مقابل متان، اتان در مقابل پروپان و c1/c2+c3 در مقابل c2/c3+c4 نشان دهنده نوع هيدروکربن به دام افتاده در مخازن زير زميني مي باشند. بر اساس دادههاي حاصل، نمونههاي محدوده مطالعاتي در محدوده مخازن نفتي و در مواردي مخازن نفتي همراه با گاز قرار ميگيرند. مخازن هيدرروکربني براساس نسبت استاندارد c3/c1×1000، با دارا بودن محدوده 20-200، تجمع هيدروکربني با اکثريت هيدروکربن هاي مايع و در مواردي همراه با گاز را نشان ميدهند. براساس logc1/(c2+c3) در مقابل logc2/(c3+c4) نيز نشان دهنده غالب بودن هيدرروکربن مايع و در موارد کمتري هيدروکربنهاي گازي همراه با نفت ميباشد. تغييرات داده هاي پارامترهاي آناليز MT1 در امتداد خطوط نمونه برداري نيز حاکيي از وجود انطباق خوب ميان آنومالي بالاي اين پارامترها با عوارض ساختاري زمين شناسي زيرسطحي (گسل) است. نتايج کنوني نشانه غالب بودن نمونهها در محدوده هيدروکربن هاي مايع و در مواردي همراه با کلاهک گازي است. هرچند تعداد معدودي از نمونه ها خصوصيات هيدروکربني با مشخصات نفت سنگين و همچنين آلودگيهاي سطحي را نشان ميدهند. بطورکلي نتايج تمامي روشهاي مورد استفاده در پيش بيني آنومالي گاز خاک تطابق خوبي را با عناصر ساختاري ناحيه نشان داده، لذا ابزار مفيدي براي شناسايي و رصد گسلهاي پنهان در سطح ميتواند محسوب گردد.
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