论著

柯克亚油气田混合来源天然气的地球化学特征

展开
  • 1.中国地质大学(北京)能源地质系,北京100083; 2. 塔里木油田分公司勘探开发研究院,新疆 库尔勒  841000; 3. 长江大学分析测试研究中心,湖北 荆州434023
侯读杰(1964-),男,河南唐河人,教授,主要从事油藏地球化学和天然气地球化学研究

收稿日期: 2003-07-18

  修回日期: 2003-09-26

  网络出版日期: 2003-12-20

基金资助

国家重点基础研究发展规划项目(编号:2001CB209100-01)资助

GEOCHEMICAL CHARACTERIZATION OF MIXING NATURAL GAS IN KEKEYAFIELD, TARIM BASIN, CHINA

Expand
  • 1. Department of Petroleum Geology, China University of Geosciences, Beijing 100083, China;
    2. Tarim Petroleum Exploration Bureau, Kuerle 841000, China; 3 Jianghan PetroleumUniversity, Jingzhou 434023, China

Received date: 2003-07-18

  Revised date: 2003-09-26

  Online published: 2003-12-20

摘要

柯克亚油气田是我国开发比较早的一个油气田,但由于受混源和其他因素的影响,对气源的认识众说纷纭。通过对天然气的地球化学特征的分析,并参照国内外关于甲烷、乙烷、丙烷碳同位素关系方面的资料,提出了如下看法: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;根据天然气40Ar/36Ar组成,柯克亚油气田的气源不是单一来源;柯克亚油气田绝大多数天然气的甲烷和乙烷碳同位素值关系符合Faber推断的 型有机质方程直线关系,说明有机质属于较好的有机质类型,或者是由原油裂解形成的天然气;除了K2井和K18井天然气成熟度较低以外,绝大多数天然气的成熟度大约在1.8%~2.2%之间,属于高过成熟气,但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,而混有成熟度低的源岩形成的天然气则有可能来自侏罗系源岩。

本文引用格式

侯读杰,肖中尧,唐友军,朱俊章,李贤庆 . 柯克亚油气田混合来源天然气的地球化学特征[J]. 天然气地球科学, 2003 , 14(6) : 474 -479 . DOI: 10.11764/j.issn.1672-1926.2003.06.474

Abstract

This paper is mainly concentrated on the geochemical characteristics and origin of gas of Kekeya field in the Tarim basin, NW China. Many dispute viewpoints  about origin of gas and condensate existed although the field has been found in 1977. This study shows that Permian mudstone is main source rock of oil and gas. The carbon isotopic value of natural gases in kekeya region are more heavy than that of other natural gases in Tarim basin which are mainly derived from lower  Palaeozoic marine source rocks. In addition, the 40Ar/36 Ar and 3 He/4 He ratios are also indirect evidence for gases mixing. The relationship between  carbon isotopes of methane and ethane is coincidence with Faber equation of gas derived from Organic matter Ⅰ, Ⅱ. This will also approve that gases are mainly  derived from source rocks which have relatively good organic matter type. Most maturity of gas is estimated as 1.8%~2.2% besides K2 and K18 well based on the formula. They belong to overmature gases which are generated by Carboniferous-Permian source rocks. In addition, the gas derived from 0.9%~1.2%  Ro source rocks (Jurassic coal-bearing strata) may also be mixing.

参考文献

[1] 贾承造,魏国齐,姚慧君,等. 塔里木盆地构造演化与区域构造地质[M].北京: 石油工业出版社,1995.
[2] 戴金星加强天然气地学研究勘探更多大气田[J].天然气地球科学,2003,14(1):3-12.
[3] 陈践发,朱岳年天然气中氮的来源及塔里木盆地东部天然中氮的地球化学特征[J].天然气地球科学,2003,14(3):172-176.
[4] 戴金星天然气地质和地球化学论文集[C].北京:石油工业出版社,1996
[5] 徐永昌,刘文汇,沈平,等.天然气地球化学的重要分支——稀有气体地球化学[J].天然气地球科学,2003,14(3):172-175.
[6] 沈平,徐永昌,王先彬,等.气源岩和天然气的地球化学特征及成气机理研究[M].兰州:甘肃科学技术出版社,1991.
[7] Berner U. Entwicklung und Anwendung empirischer Modelle fur die Kohlenstoffisotopenvariationen in Mischungen thermogener Erdgase[D]. PH D. Dissertation.T. U. Clausthal, FRG, 1989.
[8] Faber E. Zur Isotopengeochemie gasformiger Kohlenwasserstoffe[J]. Erdol, Erdgas & Kohle, 1987,103: 210-218.
[9] Whitcar M J.天然气气—源岩对比[A].Magoon L B, Dow W G.含油气系统—从烃源岩到圈闭[C].张刚译北京:石油工业出版社,1998.

文章导航

/