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    The origin and accumulation of multi-phase reservoirs in the east Tabei uplift, Tarim Basin, China

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    Authors
    Zhang, Z.
    Zhu, G.
    Zhang, Y.
    Han, J.
    Li, T.
    Wang, E.
    Greenwood, Paul
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Zhang, Z. and Zhu, G. and Zhang, Y. and Han, J. and Li, T. and Wang, E. and Greenwood, P. 2018. The origin and accumulation of multi-phase reservoirs in the east Tabei uplift, Tarim Basin, China. Marine and Petroleum Geology. 98: pp. 533-553.
    Source Title
    Marine and Petroleum Geology
    DOI
    10.1016/j.marpetgeo.2018.08.036
    ISSN
    0264-8172
    School
    School of Molecular and Life Sciences (MLS)
    URI
    http://hdl.handle.net/20.500.11937/72828
    Collection
    • Curtin Research Publications
    Abstract

    © 2018 Elsevier Ltd A giant deep-strata oil-gas field with complex fluid characteristics was recently discovered in the Hade-Yuke area of the east Tabei uplift (Tarim Basin, NW China). The deep fluids show a lateral co-existence of several gas, condensate and oil phase reservoirs characterized through the integration of complimentary geochemical (e.g., bulk composition, biomarker and stable carbon isotope) and geological data. Typical features of the gas and condensate reservoirs, which were mainly distributed in the eastern parts of the study site, included high GOR (gas-to-oil ratio), hydrocarbon gases with relatively heavy d13C values and crude oils with high wax content. In contrast oil reservoirs, which mostly occurred in more westerly locations, had lower GOR values, lighter d13C values and lower wax content, indicating gradual change of fluid characters. The petroleum accumulations derive from two hydrocarbon charge events: an early oil charge in the Late Hercynian and a later gas charge in the Late Himalayan which migrated from east to west, leading to a gradual variation in fluid phase and characteristics. Alteration of paleo oil reservoirs by this secondary gas charge was therefore primarily responsible for the complex fluid character and multi-phase reservoirs presently in place. Secondary condensates were formed from the retrograde condensation of paleo reservoirs. Our re-construction of the hydrocarbon accumulation process encourages future exploration endeavours to target commercially viable gas accumulations in the deep east strata and oil reservoirs in the west.

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