岩性油气藏 ›› 2016, Vol. 28 ›› Issue (5): 52–58.doi: 10.3969/j.issn.1673-8926.2016.05.006

• 油气地质 • 上一篇    下一篇

四川盆地东部下志留统龙马溪组页岩储层特征及影响因素

李 可1,2,3,王兴志1,2,张馨艺1,2,3,要继超1,2,吴清民1,2   

  1. (1.油气藏地质与开发工程国家重点实验室·西南石油大学,成都 610500; 2.西南石油大学 地球科学与技术学院,成都 610500; 3.四川省能源安全与文化社科普及基地,成都 610500)
  • 出版日期:2016-09-29 发布日期:2016-09-29
  • 第一作者:李可(1990-),男,西南石油大学在读博士研究生,研究方向为非常规油气地质。地址:(610500)四川省成都市新都区新都大道 8 号西南石油大学。E-mail:623621836@qq.com
  • 通信作者: 王兴志(1964-),男,博士,教授,主要从事沉积学和储层地质学等方面的教学与科研工作。E-mail:wxzswpi@163.com。
  • 基金资助:

    四川省科技支撑项目“四川盆地下古生界页岩气资源潜力评价及选区”(编号:2015SZ0001-3)资助

Shale reservoir characteristics and influencing factors of the Lower Silurian Longmaxi Formation in the eastern Sichuan Basin

Li Ke 1,2,3, Wang Xingzhi 1,2, Zhang Xingyi1,2,3, Yao Jichao1,2, Wu Qingmin1,2   

  1. (1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University,Chengdu 610500, China; 2. School of Geoscience and Technology, Southwest Petroleum University,Chengdu 610500, China; 3. The Energy Security, Culture and Social Sciences Bases in
    Sichuan Province, Chengdu 610500, China)
  • Online:2016-09-29 Published:2016-09-29

摘要:

四川盆地东部下志留统龙马溪组页岩气勘探已取得重大突破,其储层研究尤其是优质储层发育的影响因素对四川盆地海相页岩的下一步勘探具有重要意义。在岩心观察和岩石薄片鉴定的基础上,通过扫描电镜和 X 射线衍射等分析,对四川盆地东部下志留统龙马溪组储层特征进行了研究,确定了有利储层形成的主控因素。研究区地层矿物成分以石英和黏土矿物为主,方解石、白云石及黄铁矿等的含量较低;干酪根类型以腐泥型(Ⅰ)为主、腐殖腐泥型(Ⅱ1)次之;TOC质量分数为 0.10%~8.67%,平均为 1.49%,Ro 为 1.63%~2.81%,平均为 2.18%;地球化学特征为富有机质和高—过成熟;储集空间类型可分为孔隙和裂缝两大类,其中粒间孔、有机质孔及构造缝为主要储集空间。四川盆地东部下志留统龙马溪组页岩储层的发育受沉积环境、页岩脆性及有机质丰度与成熟度等因素的影响。

关键词: 孔隙特征, 吸附能力, 陆相页岩, 长7 段, 鄂尔多斯盆地

Abstract:

The shale gas exploration of the Lower Silurian Longmaxi Formation in the eastern Sichuan Basin has achieved a major breakthrough, so the research of reservoir quality, especially the influencing factors of favorable reservoir deve?lopment, is significant for the next exploration of marine shale in Sichuan Basin. Based on core observation and rock slice identification, combined with scanning electronic microscope X?ray diffraction, this paper studied the reservoir characteristics of the Lower Silurian Longmaxi Formation in the eastern Sichuan Basin, and determined the main con?trolling factors for the formation of favorable reservoir. The minerals in the study area are mainly composed of quartz and clay minerals, with little calcite, dolomite and pyrite. Kerogen type is mainly sapropel(Ⅰ), and humic?sapropel(Ⅱ1) comes second. The mass fraction of TOC is 0.10%?8.67%, and the average value is 1.49%. The Ro is 1.63%?2.81%, and the average value is 2.18%. Geochemical characteristics show a rich organic matter and high maturity. Reservoir space can be divided into two categories: pores and cracks, in which intergranular pores, organic pores and structural fractures are dominant. The shale reservoir development in the study area is affected by the sedimentary environment, shale brittleness, organic matter abundance and maturity.

Key words: pore characteristics, adsorption capacity, nonmarine shale, Chang 7 member, Ordos Basin

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