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Volume 15 Issue 1
Mar 2004
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Dujie Hou, Zhongyao Xiao, Youjun Tang, Junzhang Zhu, Xianqing Li. Origin of Natural Gas in Kekeya Field, Tarim Basin, China. Journal of Earth Science, 2004, 15(1): 91-98.
Citation: Dujie Hou, Zhongyao Xiao, Youjun Tang, Junzhang Zhu, Xianqing Li. Origin of Natural Gas in Kekeya Field, Tarim Basin, China. Journal of Earth Science, 2004, 15(1): 91-98.

Origin of Natural Gas in Kekeya Field, Tarim Basin, China

Funds:

the 973 Project 2001CB209101

partly by Tarim Petroleum Research Foundation 41301050387

  • Received Date: 10 Nov 2003
  • Accepted Date: 25 Dec 2003
  • This paper is mainly concentrated on the geochemical characteristics and origin of gas of Kekeya field in the Tarim basin, NW China. This study shows that Permian mudstone is the main source rock of oil and gas. Based on the carbon isotopes of C1-C4, the carbon isotope of gas in Kekeya field is a little heavier than that in the typical marine-derived gas. The relationship between carbon isotopes of methane and ethane is coincident with Faber equation of gas derived from organic matter Ⅰ/Ⅱ. The majority of gas maturity is estimated, based on the formula, at 1.8%-2.2% besides K2 and K18 wells. In addition, the gas derived from 0.9%-1.2% Ro source rocks may also be mixture. 40Ar/36Ar and 3He/4He ratios from the gas samples also support the mixing process. Moreover, the gas in this region is mainly generated from more mature source rocks although the low mature gas exists.

     

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