Definition of petroleum generating time for Lower Cambrian bitumen of the Kuangshanliang in the west Sichuan Basin,China:Evidence from Re-Os isotopic isochron age

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  • 1.Sinopec Key Laboratory of Petroleum Accumulation Mechanisms,Wuxi 214151,China;2.Wuxi Institute of Petroleum Geology,
    Sinopec,Wuxi 214151,China;3.Basin and Reservoir Research Center,China University of Petroleum,Beijing 102249,China;
    4.National Research Center for Geoanalysis,Chinese Academy of Geological Sciences,Beijing 100037,China

Received date: 2015-08-02

  Revised date: 2016-01-29

  Online published: 2019-09-19

Abstract

Bitumen veins and oil seepages,especially Lower Cambrian bitumen veins,were widely distributed in the north part of Longmenshan Mountain in western Sichuan Basin,which indicates that the prospect for Sinian and Cambrian oil reservoir is fine in the area.Although some progress has been made in the origin of bitumen veins in Lower Cambrian,there are still big differences in the source rocks.At the same time,petroleum producing time of bitumen vein is lack of systematically researches.Rhenium(Re)-Osmium(Os)isotopic chronology is a new method to apply for geochronology of hydrocarbon accumulation,and can directly date the age of source rock,oil,oil sand and bitumen.The pre-treatment means and experimental instrument on extraction and dissolution of asphaltenes,purification,enrichment and separation of Re and Os were established by a series conditional tests.Re-Os isotopic chronology consists of sample preparation,dissolution,Re and Os purification and chemical separation,Re and Os isotope mass spectrometry measurements,and data treatment of by Isoplot software.The research for Re-Os isotopic isochron age and source rock of bitumen indicates that the asphalt maturity is low,the generating time of predecessor hydrocarbon is between 572Ma and 559Ma of Late Sinian in Neoproterozoic era,and it came from the very old source rocks in the Lower Cambrian in the Kuangshanliang structure.By means of Re-Os isochron ages,initial187Os/188Os ratios,carbon isotope compositions and biomarkers,the Lower Cambrian bitumen in Guangyuan area is originated from the fine source rocks of the Doushantuo Formation in Sinian,and the hydrocarbon source rocks were of low maturity and generated a certain amount of thick oil from 572Ma to 559Ma.Subsequently,thick oil entered the Dengying layer and formed paleo-oil reservoir.Because of the late uplift,paleo-oil reservoir in the Sinian Dengying Formation was constructed and oil dispersed upward and formed into present asphalt vein.

Cite this article

Wang Jie, Tenger, Liu Wen-hui, Ma Liang-bang, Tao Cheng, Zhou Yuan-yuan, Wang Ping, Li Chao . Definition of petroleum generating time for Lower Cambrian bitumen of the Kuangshanliang in the west Sichuan Basin,China:Evidence from Re-Os isotopic isochron age[J]. Natural Gas Geoscience, 2016 , 27(7) : 1290 -1298 . DOI: 10.11764/j.issn.1672-1926.2016.07.1290

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