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

Li Juan; Yu Bingsong; Zhang Jinchuan; Li Yuxi; Wu Jingshu

doi:10.11743/ogg20120305

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Reservoir characteristics and their influence factors of the Lower Cambrian dark shale in northern Guizhou
Vol. 33, Issue 3, Pages: 364-374(2012)
Online First：28 June 2012，

Published：2012
DOI： 10.11743/ogg20120305
稿件说明：

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DOI：

Li Juan, Yu Bingsong, Zhang Jinchuan, et al. Reservoir characteristics and their influence factors of the Lower Cambrian dark shale in northern Guizhou[J]. 2012, 33(3): 364-374. DOI： 10.11743/ogg20120305.

摘要

为了评价黔北地区下寒武统牛蹄塘组黑色页岩的储气性能

对黔北下寒武统牛蹄塘组的20余个露头剖面进行了系统采样和岩石物性、扫描电镜、压汞分析、比表面和孔径等分析测试。初步研究结果表明:黔北地区下寒武统页岩中石英含量平均为56.3%

粘土矿物平均含量为30.5%

有效孔隙度平均为8.24%

渗透率平均为0.127×10

-3

μm

具有低渗致密的储层特征;孔径分布集中在4 nm左右

本区页岩孔隙以中孔为主。孔隙体积与石英、粘土矿物和有机碳含量等的相关性分析表明

石英含量与微孔和中孔体积成负相关

而与宏孔成弱的正相关关系;粘土物质则正相反

与微孔和中孔体积成正相关

而与宏孔成弱的负相关关系;有机碳含量和中孔体积、宏孔体积成一定的正相关性;镜质体反射率与宏孔体积成弱的正相关性。

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

μm

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.