Gas Relative Expulsion Efficiency of Source Rocks with Different Types of Kerogen

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  • 1.Research Institute of petroleum Exploration and Development,Beijing 100083,China;
    2.Key Laboratory of Petroleum Geochemistry,Beijing 100083,China;
    3.China University of Mining and Technology,Beijing 100083,China;
    4.China University of Petroleum,Beijing 102249,China

Received date: 2013-11-05

  Revised date: 2013-12-20

  Online published: 2014-01-10

Abstract

With increasing of unconventional gases exploration(such as shale gas),the gas relative expulsion efficiency of source rocks is becoming an interesting topic.Based on data of gas content gotten from porosity and adsorptivity in the laboratory measurement and the theorical calculation,the expulsion efficiency of gas from source rocks with different types of kerogen and maturities has been studied.With the increasing of the maturity,the expulsion efficiency is becoming larger gradually.But there are great differences existed between coal-measures and marine source rocks with type Ⅰ-Ⅱ1 kerogen.The expulsion efficiency of gas from the coal measures is very high and is up to 75%,even more than 90% at the thermal maturity(RO) of 1.0%.The result shows that the gas from the coal measures was expulsed into the reservoir mostly and became an important source of the large coal-derived gas field.Compared with the coal measures,the gas expulsion efficiency for marine source rocks with type Ⅰ-Ⅱ1 kerogen is relatively lower and is mostly less than 70%.The gas from the shale mostly retains in the source rocks and become the important source of shale gas resource.

Cite this article

HU Guo-yi,ZHANG Shui-chang,TIAN Hua,CHEN Jian-ping,TIAN Xing-wang,WANG Fei-yu,MA Xing-zhi . Gas Relative Expulsion Efficiency of Source Rocks with Different Types of Kerogen[J]. Natural Gas Geoscience, 2014 , 25(1) : 45 -52 . DOI: 10.11764/j.issn.1672-1926.2014.01.45

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