Secondary Hydrocarbon Generation Potential of Marine Shale Source Rocks in Thermal Modeling

Abstract

Abstract:

Based on simulation experiments of the natural maturity marine shale samples, this article presents a brief discussion on secondary hydrocarbon generation of marine shale. The results indicate that the secondary hydrocarbon generation is not continuous with the evolution tendency of the first hydrocarbon generation of marine shale. There is a hydrocarbon generation peak during the secondary hydrocarbon generation process of low matured shale and matured shale, which is later than that of the first continuous hydrocarbon generation. The lagging is enhanced when the original maturity increases. The secondary hydrocarbon generation process of high matured shale and overmatured shale does not have a hydrocarbon generation peak. Secondary hydrocarbon generative potential is dominated by original maturity. Marine shale which has an original maturity before being oil window has preferable secondary hydrocarbon generative potential to yield abundant oil and gas. Marine shale which has an original maturity just being in oil window has preferable secondary gas generative potential and weakened secondary oil generative potential. Marine shale which has a higher original maturity than that of oil window has poor secondary oil generative potential, but still can generate considerable quantity of gas. The marine shale which has a higher original maturity than the oil-generating dead line almost has not any secondary hydrocarbon potential. This research improves the current theory of secondary hydrocarbon generation, and can be a good guidance for evaluation on marine source rock in superimposed basin in China.

Key words: marine shale, secondary hydrocarbon generation, simulation experiment, original maturity

CLC Number:

TE122.1

XIN Yan-Peng, QIN Jian-Zhong, ZHENG Lun-Ju, QIU Nan-Sheng. Secondary Hydrocarbon Generation Potential of Marine Shale Source Rocks in Thermal Modeling[J]. Geoscience, 2010, 24(6): 1079-1084.

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