岩性油气藏 ›› 2015, Vol. 27 ›› Issue (4): 40–46.doi: 10.3969/j.issn.1673-8926.2015.04.006

• 油气地质 • 上一篇    下一篇

四川盆地东部石炭系黄龙组白云岩成因

刘诗宇1,2,胡明毅1,2,胡忠贵1,2,戴危艳1,2   

  1. 1. 长江大学 油气资源与勘探技术教育部重点实验室,武汉 430100 ;2. 长江大学 地球科学学院,武汉 430100
  • 出版日期:2015-07-20 发布日期:2015-07-20
  • 第一作者:刘诗宇( 1991- ),男,长江大学在读硕士研究生,研究方向为储层地质和层序地层学。 地址:( 430100 )湖北省武汉市蔡甸区大学路特 1号长江大学武汉校区。 E-mail : 1205762144@qq.com
  • 基金资助:

    国家重大科技专项“中国大型气田形成条件、富集规律及目标评价”(编号: 2011ZX05007-002 )资助

Dolomite genesis of Carboniferous Huanglong Formation ineastern Sichuan Basin

Liu Shiyu12, Hu Mingyi12, Hu Zhonggui12, Dai Weiyan12   

  1. 1. Key Laboratory of Exploration Technologies for Oil and Gas Resources , Ministry of Education , Yangtze University ,Wuhan 430100 , China ; 2. School of Geosciences , Yangtze University , Wuhan 430100 , China
  • Online:2015-07-20 Published:2015-07-20

摘要:

四川盆地东部石炭系黄龙组是重要的天然气产层,白云石化作用是优质储层发育的必要条件,白云石化成因类型研究对该区油气勘探具有重要意义。 根据岩心和野外剖面观察与描述,结合薄片资料,认为区内黄龙组主要发育以下几种类型的白云岩:泥—微晶白云岩、粉-细晶白云岩和残余颗粒粉-细晶白云岩等,以及充填于孔、洞或缝中的白云石胶结物。结合 X 射线衍射分析数据和稳定同位素 δ13C 与 δ18Ο 资料,发现该区不同类型的白云岩以及白云石胶结物的形成条件和物性特征各异,分别用不同的成因模式来解释更为合理,在此基础上总结了黄龙组具有如下 4 种白云岩成因模式:泥—微晶白云岩的蒸发泵白云石化成岩模式、(残余颗粒)粉—细晶白云岩的埋藏压实白云石化成岩模式、淡水白云岩的调整白云石化成岩模式和异形白云岩的构造热液白云石化成岩模式。

关键词: 致密油, 地质特征, 勘探现状, Bakken 组, 延长组, 芦草沟组

Abstract:

The Carboniferous Huanglong Formation in eastern Sichuan Basin is an important producing formation for natural gas. Dolomitization is a requirement for the development of high quality reservoir, and the research of genetic types for dolomite has important meaning for oil and gas exploration. Based on core observation and outcrop description, combined with thin section analysis data, it is considered that Huanglong Formation mainly developed the following types of dolomite: mud-microcrystalline dolomite, powder to fine-grained dolomite and residual particles powder to fine-grained dolomite as well as dolomite cement filling in pores, holes and cracks. On the basis of the data of X ray diffraction analysis and geochemical characteristics of stable isotope δ13C and δ18Ο, it is found that formation conditions and physical characteristics of different types of dolomite in the study area exhibit different characteristics, and it’s more reasonable to use different origin types for the explanation. Four kinds of genetic model of dolomite of Huanglong Formation were summarized, including: diagenetic dolomitization evaporation pump model for mud-microcrystalline dolomite, burial diagenetic dolomitization compaction model for (residual particles) powder to fine-grained dolomite, diagenetic adjustment dolomitization model for freshwater dolomite and construction hydrothermal dolomitization diagenetic model for abnormal morphology dolomite.

Key words:  tight oil, geologic characteristics, exploration status, Bakken Formation, Yanchang Formation, Lucaogou

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