Oil & Gas Geology ›› 2012, Vol. 33 ›› Issue (3): 364-374.doi: 10.11743/ogg20120305

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Reservoir characteristics and their influence factors of the Lower Cambrian dark shale in northern Guizhou

Li Juan1, Yu Bingsong1, Zhang Jinchuan2, Li Yuxi3, Wu Jingshu1   

  1. 1. State Key Laboratory of Geological Process and Mineral Resources, China University of Geosciences, Beijing 100083, China;
    2. School of Energy Resources, China University of Geosciences, Beijing 100083, China;
    3. Research Center for Oil and Gas Resource Strategy, Ministry of Land and Resources, Beijing 100034, China
  • Received:2011-09-09 Revised:2012-05-10 Online:2012-06-28 Published:2012-07-10

Abstract:

In order to assess the gas potential of the dark shale of the Lower Cambrian Niutitang Formation in the northern part of Guizhou,samples were collected from 20 outcrop cross sections of the Lower Cambrian Niutitang Formation in the northern part of Guizhou and many experiment tests such as physical property,SEM,mercury porosimetry,specific surface and pore size were conducted.Preliminary study results show that the average content of quartz and clay minerals are 56.3% and 30.5% and the effective porosity and permeability are 8.24% and 0.127×10-3 μm2 respectively.Pore sizes cluster around 4.0 nm.The pores are dominated by mesopores.The analysis of the relation between pore volume and quartz content,clay mineral contents and TOC shows that the content of quartz is negatively correlated with the volumes of micropore and mesopore,but slightly positively correlated with macropore;clay mineral contents are just the opposite to quartz content;TOC is positively correlated with mesopore and macropore to some extent;and vitrinite reflectance has a weak positive correlation with macropore.

Key words: pore, reservoir characteristics, dark shale, Niutitang Formation, Cambrian, northern Guizhou

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