Identification of bacterial-like fossils in marine source rocks in south China

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  • 1.SINOPEC  Key Laboratory of Hydrocarbon Accumulation,Wuxi 214151,China;
    2.Wuxi Research Institute of Petroleum Geology,SINOPEC,Wuxi 214151,China;3.Nanjing University,Nanjing 210023,China

Received date: 2017-02-27

  Revised date: 2018-03-15

  Online published: 2018-04-10

Abstract

Based on the results of conventional geochemical analysis,zoogloea fossils were discovered in the low mature marine hydrocarbon source rocks and coal seams in south China,and the sizes of bacterial-like fossils ranged from dozens of nanometers to several microns with circular,oval,oblate shapes,which were observed in the thin section and scanning electron microscope.The confirmed bacterial-like fossils in the Permian source rocks were mainly formed by the symbiotic sulphur bacteria with gypsum.Abundant nanoscale bacterial-like fossils discovered in the Chengkou section within Cambrian strata were mainly in the shape of rod-short columnar.Many possible bacterial-like fossils were found in Permian,Silurian,and Cambrian source rocks with high maturity under the scanning electron microscope.There was still some preliminary perspective as follows: bacterial-like fossils were prevalent in the source rocks and had a symbiotic relationship with source rocks,especially in the mudstone,siliceous rocks,some stratum containing coal seam and gypsum;the bacteria on the surface of mudstone formed microbial mats;the bacteria in siliceous rocks had the behavior of dissolving silicon;the symbiotic bacteria with gypsum in the coal seam were sulphur bacteria playing important role in the formation of gypsum.The study of the formation mechanism and environment of bacterial-like fossils via online analysis on microdomains will provide new insights for evaluation of source rocks.

Cite this article

Shen Bao-jian,Qin Jian-zhong,Tengger,Pan An-yang,Yang Yun-feng,Bian Li-zeng . Identification of bacterial-like fossils in marine source rocks in south China[J]. Natural Gas Geoscience, 2018 , 29(4) : 510 -517 . DOI: 10.11764/j.issn.1672-1926.2018.03.013

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