Hydrocarbon expulsion efficiency of source rocks and its influencing factors

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  • 1.Langfang Branch,Research Institute of Petroleum Exploration & Development,PetroChina,Langfang 065007,China;
    2.CNPC Key Laboratory of Gas Reservoir Formation and Development,Langfang 065007,China

Received date: 2016-04-20

  Revised date: 2016-06-09

  Online published: 2019-09-11

Abstract

Hydrocarbon expulsion efficiency of source rocks is an indispensable parameter in petroleum resources evaluation.The research on hydrocarbon expulsion efficiency can not only guide the evaluation of resources,but also can be used as an important scientific method to verify the reliability of resource evaluation results.A new hydrocarbon efficiency simulation experiment method under stratigraphic condition (forward) is created,this new experiment method and geologic profile method (inversion) are used to calculate the hydrocarbon efficiency of different types of hydrocarbon source rocks.What’s more,six influencing factors (degree of thermal evolution,types of organic matter,organic matter abundance,source and reservoir configuration,thickness of source rocks and sedimentary overpressure) of hydrocarbon expulsion efficiency are analyzed in the article.The hydrocarbon expulsion efficiency of the sapropelic type organic matter in the mature stage is 40%-60% and it is up to 50%-80% in the high maturity stage.At the same stage of evolution,the hydrocarbon expulsion efficiency of humic type organic matter is lower by 10%-20%.Because of hydrocarbon expulsion efficiency is controlled by many factors,so different regions should be treated differently according to different geological conditions.

Cite this article

Ma Wei, Li Jian, Wang Dong-liang, Wang Yi-feng, Ma Cheng-hua, Wang Zhi-hong, Du Tian-wei . Hydrocarbon expulsion efficiency of source rocks and its influencing factors[J]. Natural Gas Geoscience, 2016 , 27(9) : 1742 -1751 . DOI: 10.11764/j.issn.1672-1926.2016.09.1742

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