天然气地球科学

• 天然气地质学 • 上一篇    下一篇

鄂尔多斯盆地中部奥陶系马家沟组中组合天然气成藏规律

吴伟涛1,2,王一3,赵靖舟1,2,杨特波3,李军1,2,黄正良3   

  1. 1.西安石油大学地球科学与工程学院,陕西 西安 710065;
    2.西安石油大学 陕西省油气成藏地质学重点实验室,陕西 西安710065;
    3.中国石油长庆油田公司勘探开发研究院,陕西 西安 710029
  • 收稿日期:2019-02-09 修回日期:2019-04-10 出版日期:2019-06-10
  • 通讯作者: 赵靖舟(1962-),男,陕西临潼人,教授,博士,主要从事油气成藏地质学、非常规油气地质与勘探研究. E-mail:jzzhao@xsyu.edu.cn.
  • 作者简介:吴伟涛(1983-),男,陕西户县人,讲师,博士,主要从事油气成藏地质学、非常规油气地质勘探研究.E-mail:wuweitaohao1013@163.com.
  • 基金资助:
    国家科技重大专项(编号:2016ZX05050);陕西省教育厅重点科研计划项目(编号:2015JS094);西安石油大学博士启动基金(编号:134010179)联合资助.

The rule of natural gas accumulation of the mid-assemblage of Ordovician Majiagou Formation in the central Ordos Basin

Wu Wei-tao1,2,Wang Yi3,Zhao Jing-zhou1,2,Yang Te-bo3,Li Jun1,2,Huang Zheng-liang3   

  1. 1.School of Earth Sciences and Engineering,Xi’an Shiyou University,Xi’an 710065,China;
    2.Key Laboratory of Hydrocarbon Accumulation of Shaanxi Province,Xi’an Shiyou University,Xi’an 710065,China;
    3.Exploration and Development Institute of Changing Oilfield Company,CNPC,Xi’an 710029,China
  • Received:2019-02-09 Revised:2019-04-10 Online:2019-06-10

摘要: 奥陶系马家沟组中组合(马家沟组五段5亚段—10亚段)是鄂尔多斯盆地天然气勘探研究的重点层位。利用钻井、测井、地震、试气及化验分析等资料,分析奥陶系马家沟组中组合天然气藏特征,探讨天然气成因与来源,从烃源岩条件、储层条件、圈闭条件和构造条件等方面深入研究了马家沟组中组合天然气成藏规律。研究表明,奥陶系马家沟组中组合天然气干燥系数均大于0.985,属于干气藏,气藏类型为岩性气藏和地层—岩性气藏,前者具有大面积分布特点,后者发育于剥蚀面附近;天然气主要来源于上古生界煤系烃源岩,下古生界碳酸盐岩类总有机碳含量主体为0.1%~0.2%,能够提供部分天然气;天然气藏的形成与分布受到烃源岩条件、输导体系、封盖条件、圈闭条件和构造条件共同控制,天然气主要富集在剥蚀面附近,运移输导体系控制着天然气富集的层位和范围,封闭条件及圈闭类型控制着天然气藏形成与分布,构造演化特征控制天然气运聚特征。

关键词: 成藏规律, 气藏特征, 天然气成因, 奥陶系, 鄂尔多斯盆地

Abstract: The mid-assemblage (5th-10th sub-members of the 5th Member of Majiagou Formation) of the Ordovician Majiagou Formation in the Ordos basin is significant layers for gas exploration and research.Based on the drilling,logging,seismic data and gas testing experiment,the paper analyzes gas accumulation of Ordovician mid-assemblage and its genesis and origin,and further studies the natural gas accumulation rules of Ordovician mid-assemblage from conditions of source,reservoir,trap and structure.The research demonstrates that the gas dryness coefficient of the mid-assemblage of Ordovician Majiagou Formation is greater than 0.985 and belongs to dry gas.The patterns contain lithological accumulation and strati-graphical accumulation,the former has extensive distribution and the latter is only developed near the denudation surface;gas mainly originated from the Upper Paleozoic coalbed source rock.The total organic carbon content of the Lower Paleozoic carbonate rock is between 0.1%-0.2% which can play partial role in gas generation;the formation and distribution is simultaneously controlled by conditions of source,reservoir,seal,trap and structure.Natural gas is enriched near the denudation surface,migration channel controls enriched layers and extent of enrichment,seals and traps of trap patterns control the formation and distribution of gas accumulation,and structure evolution controls the characteristics of gas migration and accumulation.

Key words: Accumulation rule, Gas accumulation feature, Genesis of natural gas, Ordovician, Ordos Basin

中图分类号: 

  • TE122.1
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