نشریه علوم زمین خوارزمی

نشریه علوم زمین خوارزمی

کاربرد ترکیبات بایومارکری و غیر بایومارکری نفت خام برای تعیین مسیرهای مهاجرت و نقاط پرشدگی مخزن آسماری در یکی از میادین شمال شرق فروافتادگی دزفول

نویسندگان
دانشگاه خوارزمی
چکیده
بازسازی مسیرهای مهاجرت و نقاط پرشدگی در یک میدان اطلاعات ارزشمندی در مورد موقعیت آشپزخانه مواد آلی (ناحیه تغذیه) و اهداف اکتشافی آتی در منطقه مورد مطالعه در اختیار قرار می­دهد. این موضوع بطور معمول توسط ترکیبات پیرولیک نیتروژن انجام می­شود. اما این نشانگرهای مولکولی با محدودیت­هایی مواجه هستند. راه­حل جایگزین استفاده از پارامترهای بلوغ حرارتی نفت خام است. مدل پرشدگی مخزن بیان می­کند که اولین نفت­های ورودی به مخزن دارای بلوغ کمتری نسبت به نفت­های بعدی هستند. بنابراین نفت­های با بلوغ بالا در نزدیک­ترین موقعیت نسبت به آشپزخانه مواد آلی قرار دارند و سطح بلوغ حرارتی نفت خام یک رابطه معکوس با فاصله از آشپزخانه مواد آلی دارد. نشانه­های تفاوت بلوغ در نفت یک مخزن حتی پس از به تعادل رسیدن ترکیب مخزن و هموژن شدن ترکیب در زمان­های زمین شناسی از بین نمی­رود. در این مقاله مسیرهای مهاجرت و نقاط پرشدگی مخزن آسماری در یکی از میادین شمال شرق فروافتادگی دزفول مورد بررسی قرار گرفت. چهار نمونه نفت خام از قسمت­های مختلف میدان تهیه شد. شباهت ویژگی­های ژئوشیمیایی در نمونه­های مورد مطالعه بیانگر این موضوع هست که نفت­ها از یک آشپزخانه مواد آلی یکسانی منشا گرفته­اند و متعلق به یک خانواده نفتی هستند. نمونه­های مورد مطالعه از یک سنگ منشا مارنی که در محیط دریای باز در شرایط احیایی ته نشین شده و دارای مواد آلی ورودی دریایی است، تولید شده­اند. مقدار اندیس اولئنان بیش از 20% در نمونه­های مورد مطالعه نشان دهنده مشارکت عمده سازند پابده در شارژ کردن میدان مورد مطالعه است. بلوغ حرارتی نمونه­ها بیانگر تولید نفت­ها از سنگ منشا در ابتدای پنجره نفتی می­باشد. بازسازی مسیر مهاجرت و نقاط پرشدگی توسط پارامترهای بایومارکی (C29 αββ/(ααα+αββ)) و غیر بایومارکری (4-/1-MDBT) بلوغ حرارتی انجام شد. نقشه‌های ایزوپلت این پارامترهای بلوغ نشان داد که مخزن آسماری در میدان مورد مطالعه از سمت جنوب شرقی شارژ شده است.

کلیدواژه‌ها

عنوان مقاله English

The application of crude oil biomarker and non-biomarker compounds in the determination of migration pathways and filling points of the Asmari reservoir in an oil field from the NE of Dezful Embayment

نویسندگان English

Morteza Asemani
Zahra Gholami
Kharazmi University
چکیده English

Reconstruction of migration pathways and filling points in a field provides critical information about the location of the source kitchen and future exploration prospects in the study area. This issue is routinely performed with pyrrolic nitrogen compounds. However, these molecular indicators have encountered some limitations. The alternative solution is using crude oil maturity parameters. The reservoir filling model implies that the early oils that entered the reservoir had lower thermal maturity than the later ones. Hence, the higher-maturity oils are in the closest location to the source kitchen, and the level of maturity has a reverse relationship with the distance from the source kitchen. The signature of maturity differences is also retained after reaching the reservoir to equilibrium, and the composition becomes homogenized during geological time scales. This paper assessed the migration pathways and filling points in the Asmari reservoir from an oil field northeast of the Dezful Embayment. Four crude oil samples were collected and geochemical analyses were performed across the field. The similar geochemical signatures of the studied crude oils indicate that they were sourced from the same source kitchen and belong to the same oil family. The analyzed samples were originated from a marl source rock deposited in an open marine setting with anoxic conditions, and marine organic matter. The oleanane index higher than 20% in the studied samples implies the significant contribution of the Pabdeh Formation in charging the studied field. The thermal maturity of samples shows that all samples were generated from the source rock at the beginning of the oil window. Reconstruction of migration pathways and filling points was performed by biomarker (4-/1-MDBT) and non-biomarker (C29 αββ/(ααα+αββ)) thermal maturity parameters. The isopleth maps of both maturity parameters revealed that the Asmari reservoir was charged from the southeast. Hence, the Pabdeh source rock has a source kitchen in the northeast of the Dezful Embayment

کلیدواژه‌ها English

Secondary migration of oil
Reservoir filling model
Geochemical characteristics
Migration molecular indicators
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