Micro-layers division and fine reservoirs contrast of Lower Silurian Longmaxi Formation shale,Sichuan Basin,SW China

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  • (1.Rresearch Institute of Petroleum Exploration and Development,PetroChina Southwest Oil and Gas Field Company,Chengdu 610051,China;
    2.Key Laboratory of Shale Gas Evaluation and Exploitation of Sichuan Province,Chengdu 610051,China;
    3.PetroChina Southwest Oil and Gas Field Company,Chengdu 610051,China;
    4.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation/Southwest Petroleum University,Chengdu 610500,China)

Received date: 2015-08-25

  Revised date: 2016-01-26

  Online published: 2016-03-10

Abstract

It is totally known that the work of Lower Silurian Longmaxi Formation shale in Sichuan Basin has entered large scale benefit development rather than resources survey,layers assessment or area choices as it was in the beginning.It urgently needs a significant direction for the integration of E & D,G & R to carry out micro-layers division and fine reservoirs.The micro-layers division begins with the study on lithology,sequence,facies,palaeontology of typical wells through core description,micro-flakes identification,logs and lab analysis.Probe effect relationship between reservoirs and output is examined by carrying out contrasts about microfacies & fine reservoirs of each micro-layer.It has been divided into four micro-layers of Lower Long 1 sub section,which are marked as “a”,”b”,”c” and ”d”.Among them the micro-layer-b is the mark among areas,which has the highest tracking.The microfacies of a & b are mainly carbon-muddy shelf and silicon-muddy shelf,which has fine area spread.The reservoirs of a & b are both type Ⅰ,which also has fine spread,though the reservoirs of c & d are mainly type Ⅲ & Ⅱ,which has the worse spread.Through the analysis of fracture effects on output-wells,it indicates that the fracture effects of a & b,which both have the advantage of microfacies,fine area spread of reservoir type I and at the bottom of Longmaxi Formation,will be better than c & d.

Cite this article

Zhao Sheng-xian,Yang Yue-ming,Zhang Jian,Wang Lan-sheng,Wang Xing-zhi,Luo Chao,Tian Chong . Micro-layers division and fine reservoirs contrast of Lower Silurian Longmaxi Formation shale,Sichuan Basin,SW China[J]. Natural Gas Geoscience, 2016 , 27(3) : 470 -487 . DOI: 10.11764/j.issn.1672-1926.2016.03.0470

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