Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (4): 102-114.doi: 10.12108/yxyqc.20230410

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Development characteristics and sedimentary environment of black shale of Lower Cambrian Niutitang Formation in western Hunan and Hubei

LIANG Xiaocong1, NIU Xing1, HU Mingyi1, LI Yang2, HU Zhonggui1, CAI Quansheng1   

  1. 1. School of Geosciences, Yangtze University, Wuhan 430100, China;
    2. Research Institute of Exploration and Development, PetroChina Southwest Oil and Gas Field Company, Chengdu 610000, China
  • Received:2022-08-31 Revised:2022-09-15 Online:2023-07-01 Published:2023-07-01

Abstract: The Lower Cambrian Niutitang Formation in the western Hunan and Hubei is an important target for shale gas exploration in southern China. Two profiles,Guchengcun in western Hubei and Yanwutan in western Hunan,were selected to carry out petrological and geochemical analysis of the black shale series of Lower Cambrian Niutitang Formation,so as to find out the provenance and tectonic background of the black shale,and analyze the sedimentary environment. The results show that:(1)The black shale deposits of Niutitang Formation in the two profiles are obviously different. The shale of Niutitang Formation in Guchengcun profile is mainly argillaceous shale with small thickness,and a small amount of siliceous shale is developed at the bottom,while the shale of Niutitang Formation in Yanwutan profile is mainly siliceous shale with large thickness,and the bottom is rich in silicophosphorous nodules,nickel,cobalt,vanadium and other metals. The quartz content of Yanwutan profile is much higher than that of Guchengcun profile,and pyrite is also more abundant.(2)There are obvious differences in the sedimentary environment,provenance background and tectonic background between the black rock series in the two profiles. The provenance of Guchengcun profile is mainly felsic igneous rocks and quartz sedimentary rocks,which were deposited in a weak reduction and weak oxidation environment on the continental shelf of the passive continental margin. The provenance of Yanwutan profile is mainly felsic igneous rocks, quartzitic sedimentary rocks and continental tholeiites, and with the input of hydrothermal provenance, it was deposited in a reducing environment on the continental slope of the passive continental margin.(3)In the Early Cambrian,the sediments of Hefeng Guchengcun in western Hubei were mainly black carbonaceous shale and limestone,with low contents of organic matters and silica,the water body was relatively shallow,and it was obviously affected by sea level fluctuations,so it was a shelf environment. However,the sedimentary thickness in western Hunan was large,with high content of organic matters,and it was close to deep faults,the source of hydrothermal silicon was abundant, which is a continental slope environment.

Key words: shelf, continental slope, geochemistry, hydrothermal silicon, black shale, Niutitang Formation, Lower Cambrian, Guchengcun profile, Yanwutan profile, western Hunan and Hubei

CLC Number: 

  • TE121.1
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