Petroleum Phase State Prediction in Deep Reservoir of Tashen-1 Well in Tarim Basin

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  • 1.Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy 
    of Sciences, Lanzhou 730000, China; 2.University of Chinese Academy of Sciences, Beijing 100049, China

Received date: 2013-05-08

  Revised date: 2013-06-13

  Online published: 2013-10-10

Abstract

The Tashen-1 well with depth of 8 408m in Tarim Basin is the deepest well in China.Natural gas was found at 6 800-7 358m in the Upper Cambrian and Lower Ordovician in this well,but the yellow liquid hydrocarbon has been discovered in cores sampled from reservoir of 8 404-8 406m.How to explain this phase characteristics is a very interesting problem for us.In this paper,phase behavior has been studied by empirical method and PT phase diagram.Z value and ternary diagram show that fluid distributing at 6 800-7 358m in the Upper Cambrian and Lower Ordovician is gas reservoir with oil ring or gas condensate reservoir.Compositions of petroleum fluid in deep reservoir of Tashen-1 well have been recovered by integrating data of natural gas composition with chromatogram of saturated hydrocarbon.Simulating result from the phase modeling software PVTsim shows that critical point(182℃,52MPa) of petroleum in deep reservoir of Tashen 1 well is located between critical condensate pressure and critical condensate temperature on the envelope line,which indicates the phase state character of volatile light petroleum.These phase characteristics are different from our observed pure gas or liquid hydrocarbon on the surface of well.

Cite this article

ZHANG Hai-kun, ZHOU Shi-xin, FU De-liang, GONG Shu-hua, LI Jing, WANG Bao-zhong, LIU Shao-peng . Petroleum Phase State Prediction in Deep Reservoir of Tashen-1 Well in Tarim Basin[J]. Natural Gas Geoscience, 2013 , 24(5) : 999 -1004,1068 . DOI: 10.11764/j.issn.1672-1926.2013.05.999

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