天然气地球科学

• 天然气地质学 • 上一篇    下一篇

鄂尔多斯盆地靖西地区下古生界奥陶系天然气成因研究

孔庆芬,张文正,李剑锋,昝川莉   

  1. 1.中国石油长庆油田分公司勘探开发研究院,陕西 西安 710018;
    2.低渗透油气田勘探开发国家工程实验室,陕西 西安 710018
  • 收稿日期:2015-04-17 修回日期:2015-06-23 出版日期:2016-01-10 发布日期:2016-01-10
  • 作者简介:孔庆芬(1977-),女,山西平遥人,高级工程师,硕士,主要从事有机地球化学研究与生产工作. E-mail:kqf_cq@petrochina.com.cn.
  • 基金资助:

    中国石油长庆油田分公司油气勘探综合研究项目“靖西地区奥陶系天然气成因研究”[编号:2012-30(7)]资助.

Origin of natural gas in Ordovician in the west of Jingbian Gasfield, Ordos Basin

Kong Qing-fen, Zhang Wen-zheng, Li Jian-feng, Zan Chuan-li   

  1. 1.Research Institute of Exploration and Development,PetroChina Changqing Oilfield Company, Xi’an 710018, China;
    2.National Engineering Laboratory for Exploration and Development of Low-permeabilityOil and Gas Fields, Xi’an 710018, China
  • Received:2015-04-17 Revised:2015-06-23 Online:2016-01-10 Published:2016-01-10

摘要:

随着靖西地区奥陶系中组合天然气勘探的突破,判识天然气成因类型、明确其主要来源成为有效指引勘探方向的关键问题。以天然气地球化学特征分析为基础,通过气—气、气—源对比、源—储—盖空间组合分析等方法,在深化高—过成熟天然气成因判别认知的同时,探讨靖西地区奥陶系天然气的主要来源。研究表明,靖西地区下古生界奥陶系天然气以煤成气为主,局部存在自生自储的油型气;对于高演化干气的成因判识,适宜选取甲烷碳同位素为主要依据。此外,本文对天然气组分碳同位素序列倒转现象提出了新的解释思路。

关键词: 碳同位素, 天然气成因类型, 奥陶系, 靖西地区, 鄂尔多斯盆地

Abstract:

With the break-through of natural gas exploration of the middle array of Ordovician Majiagou Formation in the west of Jingbian Gasfield,the determination of the origin of natural gases becomes a key issue of the gas exploration direction.Based on the analysis of the geochemical characteristics of natural gas,deepening the understanding of distinguishing the origin of high-over mature gas,the paper investigated the primary source of the natural gas of Ordovician in the west of Jingbian Gasfield by the correlation of gas-gas and gas-source and the analysis of the spacial combination of source-reservoir-cap rocks.The results show that the Ordovician natural gas in the west of Jingbian Gasfield mainly belongs to coal-formed gas and there is some oil-type gas which is characterized by self-generation and self-preservation in local areas.According to the research,the genetic discrimination of highly matured dry gas should take the methane carbon isotope as a main basis.In addition,a kind of new interpretation about the phenomenon that the δ13C2 is apparently low and even lower than δ13C1 has been put forward in this paper.

Key words: Carbon isotope, Genetic type of natural gas, Ordovician, The area to the west of Jingbian Gasfield, Ordos Basin

中图分类号: 

  • TE122.2+3
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