کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4458427 1620961 2006 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Experimental investigation of the compositional variation of acyclic paraffins during expulsion from source rocks
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی اقتصادی
پیش نمایش صفحه اول مقاله
Experimental investigation of the compositional variation of acyclic paraffins during expulsion from source rocks
چکیده انگلیسی

Anhydrous non-isothermal heating experiments were conducted under controlled compressive stress on cylindrical plugs of six oil shales from Permian through Eocene age. The objective of this study was to compare the distribution of acyclic paraffins in initial, residual and expelled organic matter and to highlight causes of compositional differences resulting from expulsion. Pristane generation from kerogen is highest in the Eocene Messel shale and affects the pristane / phytane (pr / ph) ratio commonly used as a redox proxy. The isoprenoid to n-alkane ratios (pr / n-C17, ph / n-C18) decrease during generation and are lowest in the residual bitumen due to preferential generation and retention of n-alkanes. The n-alkane distribution shows that only lacustrine shales produce high wax oils. Evaporative fractionation leads to loss of n-alkanes up to n-C20 with boiling points below 350 °C. This demonstrates that lacustrine and marine shales may lead to accumulation of low wax oils due to evaporative fractionation after expulsion.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Geochemical Exploration - Volume 89, Issues 1–3, April–June 2006, Pages 100–103
نویسندگان
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