天然气甲烷碳同位素动力学研究及其应用：以塔里木盆地库车坳陷克拉2气田为例

天然气甲烷碳同位素动力学研究及其应用：以塔里木盆地库车坳陷克拉2气田为例

李贤庆1 2, 肖贤明2, 唐永春3, 肖中尧4, 米敬奎2, 刘德汉2, 申家贵2

1. 中国矿业大学,煤炭资源教育部重点实验室,北京, 100083; 2. 中国科学院,广州地球化学研究所有机地球化学国家重点实验室,广州, 510640; 3. 美国加州理工学院,石油能源与环境研究中心,美国,加州, 91789; 4. 中国石油塔里木油田分公司,勘探开发研究院,库尔勒, 841000

收稿日期:2005-03-20 修回日期:2005-03-20 出版日期:2005-03-20 发布日期:2005-03-20

A Kinetic Study on Methane Carbon Isotopes of Natural Gas and Its Application：A Case Study of Kela-2 Gas Field in the Kuqa Depression,Tarim Basin

LI Xian-qing1 2, XIAO Xian-ming2, TANG Yong-chun3, XIAO Zhong-yao4, MI Jing-kui2, LIU De-han2, SHEN Jia-gui2

1. Key Laboratory of Coal Resources, Ministry of Education, China University of Mining & Technology, Beijng 100083, China; 2. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Science, Guangzhou 510640, China; 3. Center of Petroleum Energy and Environmental Research, California Institute of Technology, California 91789, USA; 4. Research Institute of Exploration and Development, Tarim Oil Field Company, CNPC, Kuerle 841000, China

Received:2005-03-20 Revised:2005-03-20 Online:2005-03-20 Published:2005-03-20

摘要/Abstract

摘要： 通过有压力的黄金管封闭体系生烃模拟实验和GC-IRMS测定,结合GOR-Isotope Kinetics专用软件,求取了塔里木盆地库车坳陷三叠系-侏罗系烃源岩生成甲烷的碳同位素动力学参数。结合地质背景,探讨了克拉2气田天然气的成因。克拉2气田天然气主要来源于早中侏罗世煤系烃源岩,属阶段捕获气,为-5Ma以来的天然气聚集,对应成熟度范围Ro为1.3％-2.5％。在此基础上,建立了克拉2气田天然气运聚成藏动力学模式,从而为天然气定量评价和动态研究提供了新思路。

Abstract: Based on thermal simulation experiment of closed gold tube system under the given pressure(50 MPa)and analysis of methane carbon isotopes with GC-IRMS isotope mass spectrography，combined with the kinetic modeling calculation by using the GOR-Isotope Kinetics software，this paper obtained the carbon isotopic kinetic parameters of methane generated from Triassic-Jurassic coal measures source rocks in the Kuqa depression，Tarim Basin．The average activation energies of Jurassic coal，Jurassic mudstone and Triassic mudstone samples selected from Well Yinan 2 were 227.90 kJ/mol，204.84 kJ/mol，230.63 kJ/mol，respectively．The kinetic modelling results of methane carbon isotopes were generally accorded with the laboratory pyrolysis data．It is demonstrated that the laboratory pyrolysis data could be extrapolated and applied to the actual geological condition by using the method of carbon isotope kinetics．Combined with the geological background，the source，maturity，and accumulation time of natural gas in Kela-2 gas field were further discussed．Natural gas of Kela-2 gas field was mainly derived from the Middle and Lower Jurassic coal-bearing source rocks，and belonged to the staged cumulative gas．The gas was chiefly accumulated in the last 5Ma，with its Ro value ranging from 1.3％ to 2.5％．On the basis of the above research．a kinetic model of natural gas migration and accumu1ation in Kela-2 gas field was established ．This kind of study may provide a new idea for natural gas quantitative assessmentand dynamic research．

李贤庆 , 肖贤明, 唐永春, 肖中尧, 米敬奎, 刘德汉, 申家贵. 天然气甲烷碳同位素动力学研究及其应用：以塔里木盆地库车坳陷克拉2气田为例[J]. J4.

LI Xian-qing1 2, XIAO Xian-ming2, TANG Yong-chun3, XIAO Zhong-yao4, MI Jing-kui2, LIU De-han2, SHEN Jia-gui2. A Kinetic Study on Methane Carbon Isotopes of Natural Gas and Its Application：A Case Study of Kela-2 Gas Field in the Kuqa Depression,Tarim Basin[J]. J4.