Study on lithofacies types and sedimentary environment of black shale of Qingshankou Formation in Qijia-Gulong Depression,Songliao Basin

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  • 1.PetroChina Research Institute of Petroleum Exploration & Development,Beijing 100083,China;
    2.PetroChina Coalbed Methane Co.Ltd.,Beijing 100028,China;
    3.Research Institute of Exploration & Development,Qinghai Oilfield Company,PetroChina,Dunhuang 736202,China

Received date: 2019-02-19

  Revised date: 2019-06-10

  Online published: 2019-09-12

Abstract

In order to study the sedimentary environment of the black shale of Qingshankou Formation in Qijia-Gulong Depression,lithofacies analysis and sedimentary model were established by using core description,thin section data and geochemical data.According to the content of organic carbon and mineral composition,six lithofacies can be divided:organic rich clay shale,organic rich silty shale,organic rich shell-bearing silty shale,organic lean silty shale,organic lean shell-bearing silty shale,organic lean shell-bearing limestone.The organic-rich shale of Qingshankou Formation is not always able to deposit in a suspending form under the low-energy hydrodynamic conditions.A large number of silt ripple laminations,lenticular bedding,ripple cross bedding,graded bedding,scouring filling structure and directional arrangement of shell indicate the existence of bottom current deposition.Trace element analysis shows that in the first member of Qingshankou Formation,lake has a large area and a deep water body.Although bottom flow and turbidity flow existed,it maintains a strong anoxic environment,forming interbeds of organic rich clay shale,organic rich silty shale,organic rich shell-bearing silty shale,and developing various lamination.Then,lake level gradually declined,the injection capacity of the delta sandstone,the anoxic environment is destroyed,resulting in worsening preservation conditions of organic matter,the lithofacies changes to the organic-poor massive mudstone.

Cite this article

Wang Lan, Zeng Wen-ting, Xia Xiao-min, Zhou Hai-yan, Bi He, Shang Fei, Zhou Xue-xian . Study on lithofacies types and sedimentary environment of black shale of Qingshankou Formation in Qijia-Gulong Depression,Songliao Basin[J]. Natural Gas Geoscience, 2019 , 30(8) : 1125 -1133 . DOI: 10.11764/j.issn.1672-1926.2019.06.014

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