天然气地球科学

• 天然气地球化学 • 上一篇    下一篇

鄂尔多斯盆地奥陶系盐下天然气地球化学特征及成因

孔庆芬 1,2,张文正1,2,李剑锋1,2,昝川莉1,2   

  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:2018-10-07 修回日期:2018-12-30 出版日期:2019-03-10
  • 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“鄂尔多斯盆地古隆起东侧奥陶系盐下高含硫天然气成因及成藏主控因素”(编号:2017GSJH010104)资助

Geochemical characteristics and genesis of Ordovician natural gas under gypsolyte in Ordos Basin

Kong Qing-fen1,2,Zhang Wen-zheng1,2,Li Jian-feng1,2,Zan Chuan-li1,2   

  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-Permeability Oil & Gas Fields,Xi’an 710018,China
  • Received:2018-10-07 Revised:2018-12-30 Online:2019-03-10

摘要: 探讨鄂尔多斯盆地奥陶系盐下天然气的成因类型及来源,为勘探部署提供理论依据。以天然气地球化学特征分析为基础,结合成藏组合特点剖析,通过烷烃气及轻烃组分碳同位素组成比对、δ13C1—RO相关性分析等综合判识天然气成因类型与来源。结果显示,鄂尔多斯盆地奥陶系盐下天然气组分以烃类气体为主,烃类组分含量平均为94.1%。烃类气体中甲烷占优势,甲烷化系数[C1/∑(C1—Cn)]随区域热演化程度的不同而变化明显,从靖边—乌审旗—神木地区,甲烷化系数依次由0.99→0.95→0.85逐渐减小。除高含硫天然气外,奥陶系盐下天然气的δ13C1值、δ13C2值整体偏低,δ13C1值分布于-45.90‰~-37.29‰之间,平均为-39.58‰,δ13C2值分布于-35.58‰~-25.77‰之间,平均为-29.9‰。奥陶系膏盐岩下高含硫天然气的甲烷、乙烷碳同位素值显著偏高,是硫酸盐热化学还原反应(TSR)的结果。综合各项地球化学指标气气、气源比对,结果显示鄂尔多斯盆地奥陶系盐下天然气属于自生自储油型气,奥陶系海相气源岩是其主力供烃源岩。

关键词: 鄂尔多斯盆地, 奥陶系, 盐下, 天然气成因类型, 碳同位素, 硫酸盐热化学还原反应

Abstract: The genetic type and source of Ordovician subsalt natural gas in Ordos Basin are discussed so as to provide theoretical basis for gas exploration.Based on the analysis of geochemical characteristics of natural gas,combined with the gas accumulation combination characteristics,the genetic type and source of Ordovician subsalt natural gas are comprehensively identified through the comparison of the stable carbon isotopic compositions of alkane gases and light hydrocarbons and the correlation analysis of δ13C1-RO.The results show that the Ordovician subsalt natural gas in Ordos Basin are mainly composed of hydrocarbon components and the average content is 94.1%.Methane in hydrocarbon gases is dominant and the methanation parameter (C1/∑(C1-Cn)) varies obviously with the difference of regional thermal maturity.From Jingbian to Wushen and Shenmu areas,the methanation parameter gradually decreases from 0.99-0.95-0.85.Except for high sulfur natural gas,the  δ13C1  and  δ13C2 values of Ordovician subsalt gas are generally low.The δ13C1  value is in ranges from -45.90‰ to -37.29‰,with an average of -39.58‰.The  δ13C2  value ranges from -35.58‰ to -25.77‰,with an average of -29.9‰.The carbon isotopic composition of methane and ethane in the high sulfur natural gas under the Ordovician gypsum-salt rock is significantly heavier,which is the result of the thermochemical sulfate reduction (TSR).The results of gas-gas and gas-source correlation of various geochemical index show that the Ordovician subsalt natural gas in Ordos Basin belongs to oil-type gas which is characterized by self-generation and self-accumulation,and the Ordovician marine source rocks are the chief source rocks of producing hydrocarbon.

Key words: Ordos Basin, Ordovician, Under-salt, Genetic type of natural gas, Carbon isotope, Thermochemical sulfate reduction

中图分类号: 

  • TE122.1+13
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