Differentiating depositional environments and maturity of crude oils using GC-AED benzothiophenic spectra |
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Authors: | Ping Shen Wanchun Wang Xiaobao Zhang Runmei Shen |
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Institution: | (1) State Key Laboratory of Gas Geochemistry, 730000 Lanzhou, China |
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Abstract: | Organosulfur compounds of crude oils and light oils (condensates), collected from ten Chinese petroleumbearing basins and
representing different sedimentary environments, were analyzed and identified using a newly-developed GC-AED technique. The
results show that the distributions of organosulfur compounds of crude oils from different sedimentary environments are of
obvious difference. The crude oils from marine carbonates are rich in organosulfur compounds and those from the source rocks
in an ocean-land interchanging facies and a littoral facies have a high abundance of organosulfur compounds, while no or less
organosulfur compounds of crude oils from a fresh-water lacustrine facies and a swamp facies were detected in the detectable
abundance range of the instrument. This analysis gives a new effective method for oil-source correlation. We also tried to
relate the various parameters of benzothiophenic compounds of crude oils with the methane carbon isotope of associated natural
gases to discuss the thermoevolutionary degree of crude oils and natural gases. |
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Keywords: | organosulfur compounds GC-AED sedimentary environment maturity |
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