天然气地球化学

东濮凹陷CO2气源岩及地球化学特征

展开
  • (成都理工大学油气藏地质及开发工程国家重点实验室,四川 成都 610059)

收稿日期: 2008-01-22

  修回日期: 2008-07-07

  网络出版日期: 2008-10-10

Carbon Dioxide Source Rock and Gas Geochemical Features, Dongpu Sag

Expand
  • (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China)

Received date: 2008-01-22

  Revised date: 2008-07-07

  Online published: 2008-10-10

摘要

东濮凹陷在下古生界奥陶系风化壳与下第三系Es13地层发现了高含CO2气层(显示)。通过气源对比分析证实,该凹陷文留构造文33块、文269块Es13中的有机气体是来源于下第三系碎屑岩地层生成的油型气,其CO2则是石炭系—二叠系的煤在二次生烃中伴生的CO2与下古生界奥陶系灰岩高温分解生成的无机CO2混合而成。对东濮凹陷这2类CO2气源岩进行高温模拟实验发现,石炭系—二叠系的煤生气能力是奥陶系灰岩的9倍,煤生成的气体70%~80%为甲烷,少量为CO2;而灰岩所生气中95%以上为CO2气;单位质量的煤与灰岩生成的气体中CO2体积相当,煤是东濮凹陷最重要的气源岩。

本文引用格式

罗小平;杨兰君;沈忠民 . 东濮凹陷CO2气源岩及地球化学特征[J]. 天然气地球科学, 2008 , 19(05) : 701 -706 . DOI: 10.11764/j.issn.1672-1926.2008.05.701

Abstract

Carbon dioxide layers have been encountered in the Ordovician weathering crust of Lower Paleozoic and in Es13 of Paleogene. Based on gas source correlation, it is considered that organic gas source in Es13 in Wenliu is from the oil\|type gas formed in the Paleogene clastic rock, while CO2 is the mixture of the associated CO2 formed in the secondary hydrocarbon generation of Carboniferous-Permian coal, and the non-organic CO2 from Ordovician limestone decomposition under high temperatures in Lower Paleozoic. According to the high temperature simulation on the two types of CO2 gas source rock in the Dongpu sag, the gas generation capacity of the Carboniferous Permian coal is 9 times stronger than that of the Ordovician limestone. Seventy to eighty percent of the coal formed gas is methane, with little CO2, while ninety percent of the gas formed in limestone is CO2. Because ofthe gas formed from the same amount of coal and limestone, the contents of CO2 are similar. Coal is the most important gas source rock in the Dongpu sag.

参考文献

[1]何家雄,夏斌,王志欣,等.中国东部及近海陆架盆地不同成因CO2运聚规律与有利富集区预测[J].天然气地球科学,2005,16(5):622-631.
[2]陈刚,何家雄,张伟.莺歌海盆地CO2成因及与国内外典型CO2气藏的类比 [J].天然气地球科学,1996,7(4):1-12.
[3]朱家蔚,许化政.东濮凹陷煤成气地化指标及其与油气的对比[J].石油与天然气地质,1985,6(3):272-279.
[4]常俊合,李新军,何江,等.东濮凹陷文古2井天然气地球化学特征及成因研究[J].天然气地球科学,2005,16(5):608-611.
[5]罗小平,张闻林,吴光兴,等.东濮凹陷文留构造CO2气藏地球化学特征及成因分析[J].天然气工业,2004,24(1):23-25.
[6]戚厚发,朱家蔚.稳定同位素在东濮凹陷天然气气源对比中的作用[J].科学通报,1984,29(2):110-113.
[7]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):157-166.
[8]蒋晓蓉,罗小平,郑尚乾.东濮凹陷天然气生成模拟与煤成气新证据[J].矿物岩石,2005,25(2):110-113.

文章导航

/