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Geochemical features and genesis of the natural gas and bitumen in paleo-oil reservoirs of Nanpanjiang Basin, China

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Abstract

Bitumen from the Nanpanjiang Basin occurs mainly in the Middle Devonian and Upper Permian reef limestone paleo-oil reservoirs and reserves primarily in holes and fractures and secondarily in minor matrix pores and bio-cavities. N2 is the main component of the natural gas and is often associated with pyrobitumen in paleo-oil reservoirs. The present study shows that the bitumen in paleo-oil reservoirs was sourced from the Middle Devonian argillaceous source rock and belongs to pyrobitumen by crude oil cracking under high temperature and pressure. But the natural gas with high content of N2 is neither an oil-cracked gas nor a coal-formed gas generated from the Upper Permian Longtan Formation source rock, instead it is a kerogen-cracked gas generated at the late stage from the Middle Devonian argillaceous source rock. The crude oil in paleo-oil reservoirs completely cracked into pyrobitumen and methane gas by the agency of hugely thick Triassic deposits. After that, the abnormal high pressure of methane gas reservoirs was completely destroyed due to the erosion of 2000–4500-m-thick Triassic strata. But the kerogen-cracked gas with normal pressure was preserved under the relatively sealed condition and became the main body of the gas shows.

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Authors and Affiliations

  1. Research Institute of Exploration and Development, PetroChina, Beijing, 100083, China

    Zhao MengJun, Zhang ShuiChang & Da Jiang

  2. Guizhou Institute of Petroleum Geology, Southern Petroleum Exploration and Development Corp. Sinopec, Guiyang, 550000, China

    Zhao Lin

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  1. Zhao MengJun
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  2. Zhang ShuiChang
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  4. Da Jiang
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Correspondence to Zhao MengJun.

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Supported by the Sinopec Project (Grant No: P00045) and the National Science & Technology Project for the 10th Five-Year Plan (Grant No. 2001BA605A-06)

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Zhao, M., Zhang, S., Zhao, L. et al. Geochemical features and genesis of the natural gas and bitumen in paleo-oil reservoirs of Nanpanjiang Basin, China. Sci. China Ser. D-Earth Sci. 50, 689–701 (2007). https://doi.org/10.1007/s11430-007-0018-8

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  • DOI: https://doi.org/10.1007/s11430-007-0018-8

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