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Source of the condensates from the Hetianhe Field and the genetic relationship between the condensates and their associated gases

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Abstract

A detailed correlation of Hetianhe condensates versus typical source rocks from the Tarim Basin was established. Moreover, the genetic relationship between the condensates and their associated gases was also studied based on their geochemical compositions and fluid inclusion data. Hetianhe condensates are characterized by high pristine/phytane (Pr/Ph) ratios, high relative abundances of C28 regular steranes, C26–C27 triaromatic steroids, and triaromatic dinosteranes, and relatively heavy stable carbon isotopic compositions. They geochemically correlate well with the Cambrian source rocks, indicating that these condensates are derived from the Cambrian rocks. Based on several molecular maturity parameters, the condensates are recognized as being moderately to highly mature, which are too low in maturity to extensively crack into gases. The gases and condensates of the Hetianhe Field are derived from the same source rocks and the gases are from oil-cracking; however, clear evidence indicates that the gases were not cracked from their associated condensates and that the gas generation from oil-cracking did not occur in the present reservoirs. The liquid condensates produced from wellheads were likely dissolved in their associated gases underground and carried into the reservoirs by the gases.

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Authors and Affiliations

  1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, 102249, China

    DaoFu Song, TieGuan Wang, MeiJun Li & ZhiYong Ni

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  1. DaoFu Song
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  2. TieGuan Wang
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  4. ZhiYong Ni
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Correspondence to TieGuan Wang.

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Song, D., Wang, T., Li, M. et al. Source of the condensates from the Hetianhe Field and the genetic relationship between the condensates and their associated gases. Sci. China Earth Sci. 58, 1566–1576 (2015). https://doi.org/10.1007/s11430-015-5096-4

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  • DOI: https://doi.org/10.1007/s11430-015-5096-4

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