The role of deep fluid in the formation of organic-rich source rocks

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  • 1.State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development,Beijing 100083,China;
    2.Research Institute of Petroleum Exploration and Production,Sinopec,Beijing 100083,China;
    3.Northwest University,Xi’an 710069,China

Received date: 2017-09-14

  Revised date: 2017-11-02

  Online published: 2018-02-10

Abstract

For a long time,the research of the formation of organic-rich source rocks has mainly focused on the inner basins.The effect of exogenous fluid on organic-rich source rocks’ formation has received little concern.As the belt connecting the inner and external of a basin,deep fluid created proper condition for the formation of organic-rich source rocks,by promoting primary productivity and organic preservation.In productivity facet,deep fluid carried a large amount of nutrient such as NO-3,PO3-4 and NH4+,hydrothermal gases such as CH4,CO2,H2 and NH3,trace metal elements such as Fe,Mn,Zn,Co and C,as well as microbes from deep earth such as archaea bacteria and thermophilic bacteria.The injection of deep fluid not only promoted the thriving of organism and primary productivity,but also provided favorable conditions for organic formation and enrichment.In preservation facet,the eruption of deep fluid sent massive CO2 to atmosphere and ocean.By combining with ions like Ca2+ and Mg2+,these CO2 transformed into carbonate.As a result,it increased the salinity of water,which in return lead to the stratification and quiescence of water.All of above process created advantageous hydrodynamic condition and redox state for organic enrichment.Besides,the dissolution of reductive gas from magma and hydrothermal,such as H2S and CO,also contributed to the formation of reductive water condition.To sum up,the eruption of deep fluids provided significant ingredients sources and favorable preservation condition for the formation of organic-rich source rocks.

Cite this article

Liu Jia-yi,Liu Quan-you,Zhu Dong-ya,Meng Qing-qiang,Liu Wen-hui,Qiu Deng-feng,Huang Zhen-kai . The role of deep fluid in the formation of organic-rich source rocks[J]. Natural Gas Geoscience, 2018 , 29(2) : 168 -177 . DOI: 10.11764/j.issn.1672-1926.2017.11.013

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