黔北地区下寒武统黑色页岩储层特征及其影响因素

doi:10.11743/ogg20120305

Abstract

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

CLC Number:

TE122.1

Li Juan, Yu Bingsong, Zhang Jinchuan, Li Yuxi, Wu Jingshu. Reservoir characteristics and their influence factors of the Lower Cambrian dark shale in northern Guizhou[J]. Oil & Gas Geology, 2012, 33(3): 364-374.

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

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