地质学报（英文版）2008，Vol.82Issue(1)：154-163,10.
Kinetic Parameters of Methane Generated from Source Rocks in the Kuqa Depression of Tarim Basin and Their Application
Kinetic Parameters of Methane Generated from Source Rocks in the Kuqa Depression of Tarim Basin and Their Application
摘要
Abstract
In a thermal simulation experiment of gold tubes of closed-system, calculating with the KINETICS and GOR-ISOTOPE KINETICS software, kinetic parameters of gas generation and methane carbon isotopic fractionation from Triassic-Jurassic hydrocarbon source rocks in the Kuqa depression of Tarim Basin are obtained. The activation energies of methane generated from Jurassic coal, Jurassic mudstone and Triassic mudstone in the Kuqa Depression are 197-268 kJ/mol, 180-260 kJ/mol and 214-289 kJ/mol, respectively, and their frequency factors are 5.265×1013s-1, 9.761×1011 s-1 and 2.270×1014 s-1. This reflects their differences of hydrocarbon generation behaviors. The kinetic parameters of methane carbon isotopic fractionation are also different in Jurassic coal, Jurassic mudstone and Triassic mudstone, whose average activation energies are 228 kJ/mol, 205 kJ/mol and 231 kJ/mol, respectively. Combined with the geological background, the origin of natural gas in the Yinan-2 gas pool is discussed, and an accumulation model of natural gas is thus established. The Yinan-2 gas is primarily derived from Jurassic coal-bearing source rocks in the Yangxia Sag. Main gas accumulation time is 5-0 Ma and the corresponding Ro is in the range from 1.25%-1.95%. The loss rate of natural gas is 25%-30%.关键词
hydrocarbon source rock, methane generation, carbon isotopic fractionation, kinetics,Kuqa Depression, Tarim BasinKey words
hydrocarbon source rock, methane generation, carbon isotopic fractionation, kinetics,Kuqa Depression, Tarim Basin分类
天文与地球科学引用本文复制引用
LI Xianqing,DONG Peng,XIAO Xianming,MI Jingkui,TANG Yongchun,XIAO Zhongyao,LIU Dehan,SHEN Jiagui,YANG Yunfeng,WANG Yan..Kinetic Parameters of Methane Generated from Source Rocks in the Kuqa Depression of Tarim Basin and Their Application[J].地质学报（英文版）,2008,82(1):154-163,10.基金项目
This research is financially supported by the National Natural Science Foundation of China(No.40572085),Open Fund of State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry,Chinese Academy of Sciences (No.OGL-200403),State Key Technologies R& D Program during the 10th Five-Year Plan Period(No.2001BA605A02-03-01 and 2004BA616A02-01-01),New-century Excellent Talent Program of Ministry of Education (No.NCET-06-0204)and China Postdoctoral Science Foundation(No.2002031282). （No.40572085）
