| 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.
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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%
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