天然气地球科学

• 天然气地球化学 • 上一篇    下一篇

渤海湾盆地廊固凹陷天然气成因类型及分布规律

王权,操义军,刁帆,张金峰,郭柳汐,邹华耀   

  1. 1.中国石油华北油田分公司勘探开发研究院,河北 任丘 062552;
    2.中国石油大学(北京)地球科学学院,北京 102249;
    3.长庆油田分公司第五采油厂,陕西 西安 710200
  • 收稿日期:2017-05-04 修回日期:2017-08-25 出版日期:2017-09-10 发布日期:2017-09-10
  • 通讯作者: 邹华耀(1963-),男,江西上高人,教授,博导,主要从事油气成藏机理研究. E-mail:huayaozou@cup.edu.cn.
  • 基金资助:

    国家自然科学基金重大项目(编号:41690134);国家自然科学基金项目(编号:U1663210);中国石油华北油田科技项目(编号:HBYT-YJY-2014-JS)联合资助.
    王权(1970-),男,河北冀州人,高级工程师,博士,主要从事油气勘探地质综合研究.E-mail:1365476846@qq.com.

The distribution and origin analysis of natural gas in Langgu Sag,Bohai Bay Basin

Wang Quan,Cao Yi-jun,Diao Fan,Zhang Jin-feng,Guo Liu-xi,Zou Hua-yao   

  1. 1.Exlporation and Development Research Institute,PetroChina Huabei Oilfield Company,Renqiu 062552,China;
    2.College of Geosciences,China University of Petroleum,Beijing 102249,China;
    3.No.5 Oil Production of PetroChina Changqing Oilfield Company,Xi’an 710200,China
  • Received:2017-05-04 Revised:2017-08-25 Online:2017-09-10 Published:2017-09-10

摘要:

基于天然气组分以及组分同位素分析结果,结合凹陷烃源岩有机地球化学特征与地质背景,对廊固凹陷天然气的成因类型及其分布规律进行了研究。结果表明,廊固凹陷浅层(<1 900m)与中深层(>1 900m)天然气的地球化学特征存在很大的差异,具有不同的成因类型。浅层天然气藏以次生型生物改造气藏为主,是热成因气的湿气部分遭受细菌降解而产生的次生生物气与残留热成因气(主要为甲烷)混合而成。其主要特征为:气体干燥系数大于95%,但重烃气含量较高(ΣC2+>0.5%);甲烷稳定碳同位素组成较轻(δ13C1值分布在-60‰~-50‰之间);异构丁烷含量增加,丙烷含量明显减少;很多气样稳定碳同位素序列在丙烷处发生局部倒转。深层天然气主要为偏腐殖型热成因气,而且大多数天然气为干酪根初次裂解气。深层天然气以低—中等成熟度(RO值范围为0.5%~0.8%)为主,主要来自成熟度相当的沙三下亚段烃源岩;而曹家务、固安地区深度超过4 000m的4个气样以及别古庄地区奥陶系潜山气藏成熟度较大(RO值范围为1.1%~1.5%),来自深层的沙四段—孔店组烃源岩。廊固凹陷深层天然气的分布受控于烃源岩干酪根类型以及热成熟度,浅层天然气的分布则主要与沟通深部热成因油气的断裂活动强度有关。固安、柳泉、郎东等地区浅层是次生型生物改造气藏的主要分布区与有利勘探带,固安—旧州地区大兴断层深部的砾岩体以及别古庄地区的潜山是深层热成因天然气的有利勘探区带。
 

关键词: 天然气组分, 同位素, 成因类型, 天然气来源, 分布规律, 廊固凹陷

Abstract:

Based on the analysis of the natural gas component and its isotope,coupled with geochemical characteristics of source rocks and geological settings,the genetic type and distribution of natural gas of Langgu Sag were investigated.Analytical results show that great difference of geochemical characteristics exist between the shallow burial reservoirs (<1 900m)and deep burial reservoirs(>1 900m),displaying different genetic types.The shallow gas reservoirs are dominated by secondary biologic modification gas reservoirs with mixed secondary biogenic gas from biodegradation of thermogenic gas and residual thermogenic gas.And this type of gas is featured by high gas dry coefficient(>95%),but also relative high content of heavy gas(ΣC2+>0.5%);significant increase of isoparaffin content and significant decrease of propane;the partially reversed carbon isotope order with anomalously heavy propane carbon isotope compositions;light stable carbon isotope (-60‰<δ13C1<-50‰) of methane.The deep gas is mainly humic-prone and generated from the primary cracking of kerogen.Maturity estimation combined with pyrolysis of the source rocks reveal that most deep gas samples are derived from E2sL3 source rock interval with low to moderate value of RO ranging from 0.5% to 0.8%,while four gas samples from deep depth in the area of Caojiawu and Gu’an as well as samples from Ordovician buried-hilled may be generated from the E2s4-Eksource rock with high value of RO varying from 1.1% to 1.5%.It is concluded that the kerogen type and maturity of the source rock control the distribution of deep gas and the activity of hydrocarbon-connecting faults may play an important role on the formation of shallow gas reservoirs.The secondary biologic modification gas reservoirs occur in the areas of Gu’an,Liuquan and Langdong.Also significant attention must be focused on the potential of deep natural gas resource and the Daxing conglomerate body in the Gu’an-Jiuzhou and the Bieguzhuang’s buried hilled are the favorable targets zone of further exploration for the deep natural gas.
 

Key words: Molecular components, Isotopes, Genetic type, Gas origin, Gas distribution, Langgu Sag

中图分类号: 

  • TE122.1 TE122.1

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