Organic Nanopores of Longmaxi and Qiongzhusi Formations in the Upper Yangtze:Biological Precursor and Pore Network

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  • 1.School of Resources and Geoscience,China University of Mining and Technology,Xuzhou 221006,China;
    2.Key Laboratory of CBM Resource and Reservoir Formation Course,Ministry of Education,China University of Mining and Technology,Xuzhou 221006,China

Received date: 2015-04-30

  Revised date: 2015-05-22

  Online published: 2015-08-10

Abstract

Baseds on the studies of samples from Lower Cambrian Qiongzhusi Formation and Lower Silurian Longmaxi Formation in the Upper Yangtze area,the organic pore structure of the target formation is quantitatively characterized.To achieve the goal,comprehensive analysis using stereoscope,CLSM,SEM were employed and further discussed associated with the organic precursor.The carbonated fossils in Qiongzhusi Formation were mainly originated from algae and preserved in 3D stereo.Owing to the influence of mineralization,the fossils are of high porosity but the surrounding is tight.The Longmaxi Formation is enriched with carbonate graptolite fossils that distributes along the bedding,leading to the unification of high TOC content layers which is ideal gas occurrence section and the mechanical weak plane which is important during fracturing.The 3D model of graptolite denoted that the multilayers formed certain pores,and the bitumen in the fossils is of positive effect in sealing and gas preservation.

Cite this article

ZHU Yan-ming,ZHANG Han,KANG Wei,WANG Yang,CHEN Shang-bin . Organic Nanopores of Longmaxi and Qiongzhusi Formations in the Upper Yangtze:Biological Precursor and Pore Network[J]. Natural Gas Geoscience, 2015 , 26(8) : 1507 -1515 . DOI: 10.11764/j.issn.1672-1926.2015.08.1507

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