Journal
JOURNAL OF ASIAN EARTH SCIENCES
Volume 54-55, Issue -, Pages 174-181Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jseaes.2012.04.010
Keywords
Marine mixed oil; The occluded hydrocarbons inside asphaltenes; Biomarker; Individual hydrocarbon carbon isotope composition; Tarim Basin
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Funding
- National Key Science Projects Program of China [2011ZX05008-002]
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The Tarim Basin, NW China, is a large composite basin with multiple sets of petroleum source rocks. The basin has undergone numerous episodes of hydrocarbon generation, migration and accumulation, making it difficult to assess the source rocks and oil-source correlation for the widespread marine oils in this area. Protected by the molecular structure of asphaltenes, occluded hydrocarbons can provide information about the early source rocks. In this work, the occluded hydrocarbons released from the asphaltenes by a mild chemical degradation method were compared with the crude oil maltenes and the adsorbed compounds from asphaltenes. Analysis of biomarker distribution and the carbon isotope composition of individual n-alkanes suggests that the widespread marine oils in the Tazhong Uplift, Tabei Lunnan Uplift and Halahatang Depression were contributed by Cambrian-Lower Ordovician source rocks at an early stage, and later mixed with hydrocarbons derived from Middle-Upper Ordovician source rocks. The marine oils in the Tarim Basin demonstrate extensive characteristics of having been derived from multiple source rocks. (C) 2012 Elsevier Ltd. All rights reserved.
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