地学前缘 ›› 2015, Vol. 22 ›› Issue (6): 197-206.DOI: 10.13745/j.esf.2015.06.015

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鄂尔多斯盆地海陆过渡相富有机质泥页岩特征及页岩气意义

闫德宇,黄文辉,张金川   

  1. 1. 中国地质大学(北京) 能源学院, 北京 100083
    2. 中国地质大学(北京) 海相储层演化与油气富集机理教育部重点实验室； 中国地质大学(北京) 页岩气勘查与评价国土资源部重点实验室, 北京 100083
  • 收稿日期:2014-03-14 修回日期:2014-05-26 出版日期:2015-11-15 发布日期:2015-11-25
  • 通讯作者: 黄文辉,男,教授,博士生导师。E-mail:huangwh@cugb.edu.cn
  • 作者简介:闫德宇(1988—),男,博士研究生,从事非常规油气资源勘探及评价方面的研究。E-mail:ydy2311@163.com
  • 基金资助:

    国家油气重大专项(2011ZX05042 - 001 - 002)；国土资源部专项“全国油气资源战略选区调查与评价”(2009GYXQ - 15)

Characteristics of marinecontinental transitional organicrich shale in the Ordos Basin and its shale gas significance.

  1. 1. School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China
    2. MOE Key Laboratory for Marine Reservoir Evolution and Hydrocarbon Abundance Mechanism, China University of Geosciences (Beijing); MLR Key Laboratory for Shale Gas Exploitation and Assessment, China University of Geosciences (Beijing), Beijing 100083, China
  • Received:2014-03-14 Revised:2014-05-26 Online:2015-11-15 Published:2015-11-25

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摘要：

以鄂尔多斯盆地石炭系—二叠系海陆过渡相富有机质泥页岩为研究对象，通过岩石热解分析、岩石抽提和族组分分析、有机元素分析以及煤岩光学分析等方法，对泥页岩中有机质丰度、类型、热成熟度、生烃潜力等地球化学特征参数进行测试；利用扫描电镜、X射线衍射、物性测试等手段，对泥页岩中矿物组成、孔渗特征等储层评价参数进行分析。研究结果表明：鄂尔多斯盆地海陆过渡相地层中泥页岩分布广泛，埋藏偏深，单层厚度较薄，但累计厚度大；泥页岩中有机碳(TOC)含量平均为2.5%，丰度较大；有机质母质中干酪根类型主要为Ⅲ型；镜质体反射率(Ro)平均为1.2%，热演化程度达到中高成熟阶段；具有较大的生烃潜力(S1+S2)；同时，石英、长石等脆性矿物含量较高；发育多种孔、缝类型；保存条件良好，为页岩气提供有利的成藏环境。

关键词: 海陆过渡相页岩, 干酪根红外光谱, 氯仿沥青“A”, 生烃潜力, 鄂尔多斯盆地

Abstract:

In this study, the CP marinecontinental transitional organicrich shale in the Ordos Basin was investigated by means of rock pyrolysis analysis, rock extraction and group analysis, organic element analysis and coal optical analysis to test the geochemical parameters, such as organic matter type, abundance, maturity and hydrocarbon generation potential. Utilizing SEM, XRD and physical property measurement, the mineral composition and the characteristics of porosity and permeability have been analyzed. The results proved that the marinecontinental transitional organicrich shale in the Ordos Basin distributes widely and has the characteristics of diminutive individual thickness but huge cumulative thickness. The content of TOC is about 2.5%, organic matter type is mainly Ⅲ, and RO is about 1.2%. Hydrocarbon potential(S1+S2) is at the stage of massive gas generation. Percentage of quartz and feldspar is high, various porosity and crack type could be found, and preservation of shale reservoir is well. All of these conditions provide the favorable environment of shale gas formation.

Key words: marinecontinental transitional shale, kerogen infrared spectrum, chloroform bitumen “A”, hydrocarbon generation potential, Ordos Basin

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