کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4551167 1328278 2011 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Petroleum-related hydrocarbons in deep and subsurface sediments from South-Western Barents Sea
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات اقیانوس شناسی
پیش نمایش صفحه اول مقاله
Petroleum-related hydrocarbons in deep and subsurface sediments from South-Western Barents Sea
چکیده انگلیسی

Subsurface sediments from a pockmark area in South-Western Barents Sea have been earlier found to contain elevated levels of petroleum-related polycyclic aromatic hydrocarbons. This work describes a comprehensive analysis of various biomarkers, including the highly source-specific hopanes, in a 4.5 m long gravity core from the same area, together with subsurface sediment samples from other areas in the region without pockmarks present (“background samples”). A clear difference between the pockmark gravity core and the background sediment cores was found, both with regard to genesis and the level of transformation of organic matter. A number of indicator parameters, such as methylphenanthrene index (MPI-1), point towards a significantly higher maturity of hydrocarbons in the pockmark core throughout its length as compared to the other sampled locations. Higher contents of microbial hopanoids (hopenes) may indicate the former presence of petroleum. These findings confirm the hypothesis of a natural hydrocarbon source in the deeper strata present in the studied location with pockmarks.


► We study geochemical biomarkers, as hopanes, in sediments from the Barents Sea.
► An area with pockmarks has a special hydrocarbon composition of sediments.
► The genesis of organic matter there seems to be petrogenic.
► The level of transformation and of thermal maturity of organic matter is high.
► This may be explained by migration of the hydrocarbon fluid from deep strata.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Marine Environmental Research - Volume 71, Issue 5, June 2011, Pages 357–368
نویسندگان
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