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《Oil & Gas Geology》 2009-03
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A discussion on the geochemical characteristics and migration and accumulation of natural gas in the eastern Tarim Basin

Lan Xiaodong1,Zhu Yanming1,Ran Qigui2,Cheng Honggang2(1.School of Resource and Earth Science,China University of Mining and Technology,Xuzhou,Jiangsu 221008,China;2.Langfang Branch of PetroChina Exploration & Development Research Institute,Langfang,Hebei 065007,China)  
There are two sets of source rocks in eastern Tarim Basin.Comprehensive analysis of components,isotopes of carbon and hydrogen,and light hydrocarbon constituents of the samples from the basin indicates that natural gas there is marine organic oil-prone gas derived from the Cambrian and Ordovician source rocks.The gas was formed at a very high temperature and therefore can be classified as cracked gas.Study on gas accumulation and migration patterns based on character of carbon isotope and gas migration index(ΔR3) shows that the direction of gas migration is generally from structural low to high.Data of the well Yingnan-2 show that the reser-voirs there had experienced at least two times of hydrocarbon charges.
【Fund】: 国家重点基础研究发展(973)计划项目(2007CB209503)
【CateGory Index】: P618.13
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