柯克亚地区天然气的成因

Geochemical characteristics and origin of gas in Kekeya field

唐友军 侯读杰 肖中尧 徐佑德

Tang Youjun Hou Dujie Xiao Zhongyao Xu Youde

长江大学地球化学系, 湖北 荆州 434023; 长江大学油气资源与勘探技术教育部重点实验室, 湖北 荆州 434023; 中国地质大学能源系, 北京 100083; 中国石油塔里木油田分公司勘探开发研究院, 新疆 库尔勒 841000; 中国石化胜利油田有限公司, 山东 东营 257000

Department of Geochemistry, Yangzte University, Jingzhou 434023, China; Yangztz University, Key Laboratory of Exploration Technologies for Oil and Gas Resources, Jingzhou 434023, China; Department of Petroleum Geology, China University of Geosciences, Beijing 100083, China; Exploitation and Development Research Institute of Tarim Oil Field Company, Petrochina, Korla 841000, China; Shengli Oilfield Co. Ltd., SINOPEC, Dongying 257000, China

柯克亚地区天然气的成因众说纷纭。通过对天然气的地球化学特征的详细分析, 发现柯克亚天然气碳同位素相对较重, 与塔里木盆地下古生界海相天然气的碳同位素组成区别较大, 并明确指出柯克亚地区的气源不是单一来源, 而具有混源特征。绝大多数天然气的成熟度在1.8%~2.2%之间, 也混有一些成熟度在0.9%~1.2%的源岩形成的天然气, 推测天然气主要来源于石炭系-二叠系源岩, 部分来源于侏罗系源岩。

There were many disputes about the origin of gas in Kekeya region since the field has been found in 1977. This paper is mainly concentrated on the geochemical characteristics of gas in Kekeya field. The carbon isotopic value of natural gases in kekeya region are much heavier than that of other natural gases in Tarim basin which are mainly derived from lower Palaeozoic marine source rocks. This study elicits that gas in Kekeya region is mixed gas. The maturity of gas is estimated as 1.8%~2.2%, which are generated by Carboniferous-Permian source rocks. In addition, it may be mixed with the gas derived from 0.9%~1.2% Ro source rocks.

国家重点基础研究发展规划项目(项目编号:2001CB209100-01)资助