岩性油气藏 ›› 2018, Vol. 30 ›› Issue (6): 67–75.doi: 10.12108/yxyqc.20180608

• 油气地质 • 上一篇    下一篇

鄂尔多斯盆地马五段膏盐岩沉积对天然气成藏的影响

孙玉景1,2, 周立发1,2   

  1. 1. 西北大学 地质学系, 西安 710069;
    2. 大陆动力学国家重点实验室, 西安 710069
  • 收稿日期:2018-04-10 修回日期:2018-07-09 出版日期:2018-11-16 发布日期:2018-11-16
  • 第一作者:孙玉景(1991-),女,西北大学在读博士研究生,研究方向为储层地质学及二氧化碳封存。地址:(710069)陕西省西安市碑林区太白北路229号西北大学地质学系。Email:nwyujing@126.com。
  • 基金资助:
    国家重点基础研究发展计划专项基金资助项目“鄂尔多斯盆地奥陶系马家沟组大规模实施二氧化碳地质封存的综合研究与数值模拟”（编号：2016YFE0102500）资助

Influences of gypsum-salt deposition on gas accumulation of the fifth member of Majiagou Formation in Ordos Basin

SUN Yujing1,2, ZHOU Lifa1,2   

  1. 1. Department of Geology, Northwest University, Xi'an 710069, China;
    2. State Key Laboratory of Continental Dynamics, Xi'an 710069, China
  • Received:2018-04-10 Revised:2018-07-09 Online:2018-11-16 Published:2018-11-16

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摘要： 马家沟组马五段是鄂尔多斯盆地奥陶系的主力天然气勘探层段，研究该层段膏盐岩沉积对天然气成藏的影响有助于气田进一步的勘探开发。利用岩心、薄片及其他统计分析资料，对马家沟组马五段膏盐岩的特征、成因及其对气藏的影响进行了综合研究。结果表明：研究区马五段膏盐岩主要是石膏岩和膏溶角砾岩，属于蒸发成因；马五段膏盐岩的沉积有利于有机质的保存和烃类物质的生成，有利于保持并提高其下部岩层的孔隙度，具有良好的封盖能力，有助于天然气的运移、聚集和保存，对马五段气藏的形成具有重要影响。该研究成果对类似地区膏盐岩沉积对天然气成藏影响的研究具有借鉴意义。

关键词: 膏盐岩, 蒸发成因, 气藏, 马五段, 奥陶系, 鄂尔多斯盆地

Abstract: The fifth member of Majiagou Formation (Ma 5 member)is the main gas exploration layer of Ordovician in Ordos Basin. Studying the influences of gypsum-salt deposition on gas accumulation is helpful to the further exploration and development of gas field. The data of cores, thin sections and other statistical analysis were used to study the lithology characteristics and genesis of gypsum-salt rocks of Ma 5 member, as well as its influences on gas reservoir. The results show that the gypsum-salt rocks in Ma 5 member mainly consist of gypsum and gypsum karst breccia, which belong to evaporative genesis. The deposition of gypsum-salt rocks in Ma 5 member is conducive to the organic matter preservation and hydrocarbon generation, and to maintaining and improving the porosity of the lower strata. It also has good sealing ability, and is beneficial for the migration, accumulation and preservation of gas. It is believed that the gypsum-salt deposition in Ma 5 member plays a significant role in the formation of gas reservoirs. This research result is of great importance for the study on the influences of gypsum-salt deposition on natural gas accumulation in similar areas.

Key words: gypsum-salt rock, evaporative genesis, gas reservoir, the fifth member of Majiagou Formation, Ordovician, Ordos Basin

中图分类号: 

  • TE122.1
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