岩性油气藏 ›› 2015, Vol. 27 ›› Issue (4): 17–24.doi: 10.3969/j.issn.1673-8926.2015.04.003

• 油气地质 • 上一篇    下一篇

湘中涟源—邵阳凹陷上二叠统大隆组页岩气储层特征

肖正辉12,牛现强1,杨荣丰1,余 烨1,黄俨然1,陈新跃1   

  1. 1. 湖南科技大学 页岩气资源利用湖南省重点实验室,湖南 湘潭 411201 ; 2. 湖南科技大学 煤炭资源清洁利用与矿山环境保护湖南省重点实验室,湖南 湘潭 411201
  • 出版日期:2015-07-20 发布日期:2015-07-20
  • 第一作者:肖正辉( 1973- ),男,博士,副教授,主要从事非常规天然气方面的教学和科研工作。 地址:( 411201 )湖南省湘潭市桃园路湖南科技大学页岩气资源利用湖南省重点实验室。 E-mail : xiaozhenghui2003@163.com 。
  • 基金资助:

    湖南省科技厅重大专项“湖南页岩气资源潜力评价及电磁探测系统研发”(编号:2012FJ1006)、湖南省科技厅科技计划项目“湘西北下寒武统牛蹄塘组页岩气富集规律研究”(编号:2013SK3163)、成都理工大学油气藏地质及开发工程国家重点实验室开放基金项目“湘西北地区复杂地质条件下页岩气富集规律研究”(编号:PLC201302)和湖南省教育厅优秀青年项目“湘中盆地演化与非常规天然气资源潜力分析研究”(编号:12B039)联合资助

Reservoir characteristics of shale gas of Upper Permian Dalong Formation in Lianyuan-Shaoyang depression, central Hunan

Xiao Zhenghui12, Niu Xianqiang1, Yang Rongfeng1, Yu Ye1, Huang Yanran1, Chen Xinyue1   

  1. 1. Hunan Provincial Key Laboratory of Shale Gas Resource Utilization , Hunan University of Science and Technology ,Xiangtan 411201 , Hunan , China ; 2. Hunan Provincial Key Laboratory of Coal Resources Clean-utilization and Mine Environment Protection , Hunan University of Science and Technology , Xiangtan 411201 , Hunan , China )
  • Online:2015-07-20 Published:2015-07-20

摘要:

为评价湘中涟源—邵阳凹陷上二叠统大隆组页岩气的勘探潜力,分析其泥页岩的有机碳含量、矿物组成、孔隙及裂隙的微观特征、孔隙度和渗透率等,系统研究了页岩气的储层特征。研究区上二叠统大隆组岩石的有机碳含量与岩性关系密切,其中硅质泥岩的有机碳含量最高,平均质量分数大于 3%,表明沉积环境是控制有机碳含量的最主要因素;硅质泥岩中石英等脆性矿物平均质量分数为 67.7%,与美国 Barnett 硅质页岩基本相当,脆性矿物含量较高;硅质泥岩中构造裂缝较发育,其形成主要与其脆性矿物含量较高及地质构造较发育等因素有关;有机碳含量较高的硅质泥岩,其有机质微孔隙也是基质孔隙及裂隙的主要组成部分;硅质泥岩的孔隙度和渗透率均较低,分别小于 5%和 0.01 mD,构造裂缝发育程度是影响硅质泥岩孔隙度和渗透率的最主要因素。

关键词: 页岩气, 岩石物理模型, 吸附气, 游离气, 蜀南地区, 四川盆地

Abstract:

To evaluate shale gas exploration potential in Upper Permian Dalong Formation in Lianyuan-Shaoyang depression, central Hunan, the reservoir characteristics of shale gas were investigated by the analysis of total organic carbon (TOC) content, mineral composition, microscopic characteristics of pores and fractures, porosity and permeability of shale. The results show that the TOC content has close relationship with lithology, the TOC content of siliceous mudstones were the highest, with an average value over 3%, which shows that it is obviously controlled by sedimentary environment. The brittle mineral contents in the siliceous mudstones were 67.7% on average, which is essentially the same as the brittle mineral contents in Barnett siliceous shale of America. The tectonic fractures developed well, and they are related to the brittle mineral contents and geological structure. The organic micropore is the main composition of pore-fracture system in the siliceous mudstones with higher TOC content. The porosity and permeability of siliceous mudstones were both low, being lower than 5% and 0.01 mD respectively. Fracture development degree is the dominant factor for influencing porosity and permeability of siliceous mudstones.

Key words: shale gas, petrophysical model, adsorbed gas, free gas, Shunan area, Sichuan Basin

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