岩性油气藏 ›› 2016, Vol. 28 ›› Issue (5): 67–75.doi: 10.3969/j.issn.1673-8926.2016.05.008

• 油气地质 • 上一篇    下一篇

川北地区下侏罗统东岳庙段页岩气富集主控因素研究

高 健1,2,林良彪1,2,任天龙3,黄棋棽1,2,余 瑜1,2   

  1. (1.油气藏地质及开发工程国家重点实验室(成都理工大学),成都 610059; 2.成都理工大学沉积地质研究院,成都 610059; 3.山东省地质调查院,济南 250013)
  • 出版日期:2016-09-29 发布日期:2016-09-29
  • 通讯作者: 林良彪(1979-),男,教授,主要从事沉积学和层序地层学方面的教学和科研工作。E-mail:linliangbiao08@cdut.cn。
  • 作者简介:高健(1989-),男,成都理工大学在读硕士研究生,研究方向为层序地层学与岩相古地理。地址:(610059)四川省成都市成华区二仙桥东三路 1 号成都理工大学油气藏地质及开发工程国家重点实验室。E-mail:1512956133@qq.com
  • 基金资助:

    国家重大科技专项“川南地区碎屑岩层系沉积特征与储层评价”(编号:2011ZX05002-004-006HZ)资助

Controlling factors for shale gas enrichment of the Lower Jurassic Dongyuemiao member in the northern Sichuan Basin

Gao Jian1,2, Lin Liangbiao1,2, Ren Tianlong3, Huang Qichen1,2, Yu Yu1,2   

  1. (1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China; 2. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China; 3. Shandong Geological Surveying Institute, Jinan 250013, China)
  • Online:2016-09-29 Published:2016-09-29

摘要:

川北地区侏罗系页岩气成藏条件良好,近年来取得了一系列突破。下侏罗统自流井组东岳庙段研究程度相对较低,其页岩气资源的勘探开发潜力有待进一步深入研究。综合应用有机地球化学、X 射线衍射和扫描电镜等分析及常规氦气法测试、等温吸附测试等技术手段,对川北地区东岳庙段富有机质泥页岩的基本地质特征进行了研究。结果表明:东岳庙段干酪根以Ⅲ型为主,有机质丰度较高,热演化程度适中;泥页岩矿物成分以黏土矿物和石英为主,黏土矿物主要由伊/蒙混层、伊利石、高岭石和绿泥石组成;泥页岩主要发育无机孔及裂缝,孔隙度平均为 3.1%,渗透率平均为 0.751 mD,但大多小于 0.1 mD,孔隙度与渗透率总体呈正相关关系;泥页岩吸附能力较强,有利于页岩气富集,但页岩气较难被解析出。综合分析后认为,川北地区东岳庙段页岩气成藏条件良好,且页岩气富集高产受控于沉积相、岩性组合及裂缝和隔离层三要素。

关键词: 页岩气, 有机地球化学, 须家河组, 前陆盆地

Abstract:

The Lower Jurassic shale is good for gas accumulation in northern Sichuan Basin, and its exploration has succeeded in recent years. Compared to Daanzhai member of Ziliujing Formation, the research of Dongyuemiao member of Ziliujing Formation is limited, so the potential of shale gas resources need to be further studied. The data of organic geochemistry, X diffraction and scanning electron microscopy, combined with conventional helium test and isothermal adsorption, were applied to study the geologic characteristics of organic?rich shale of Dongyuemiao member. The results show that the kerogen type is mainly Ⅲ type, the abundance of organic matter is high and its thermal evolution is in the middle mature stage. The shale composition is mainly quartz and clay minerals which are mainly composed of illite/smectite, illite, kaolinite and chlorite. The shale reservoir is composed of inorganic pores and fractures. The porosity and permeability of shale are 3.1% and 0.751 mD in average respectively, but the permeability of most of the samples is less than 0.1 mD. The porosity is correlated positively with permeability. The adsorption ability of shale is relatively strong, which is favorable for shale gas enrichment, meanwhile, it is difficult for desorption of shale gas. It is considered that Dongyuemiao member is relatively good for shale gas accumulation, and the sedimentary facies, lithology assemblage, fracture, and isolation layer are key factors for the shale gas enrichment.

Key words: shale gas, organic geochemistry, Xujiahe Formation, foreland basin

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