Comparison study of three natural gases reservoirs pore properties in Guxian block,Qinshui Basin

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  • 1.Shanxi Provincial Coal Geological,Geophysical Prospecting,Surveying and Mapping Institute,Jinzhong 030600,China;
    2.School of Resources and Geoscience,China University of Mining and Technology,Xuzhou 221116,China

Received date: 2016-07-21

  Revised date: 2016-09-11

  Online published: 2017-03-10

Abstract

The development features of the pores have very important influence on the unconventional natural gas migration and occurrence.The paper adopted the high-pressure mercury intrusion to perform a comparative study on the pore properties of four coal samples,fives shales and three tight sandstones in Guxian block,Qinshui Basin.This study shows that the pressurized mercury porosity ratio,the median pore diameter ratio of volume and median pore diameter ratio of area of coal,shale and sandstone is 1∶0.49∶0.78,1∶1.64∶15.43 and 1∶1.63∶2.73 respectively.The total intrusion volume ratio and the total pore area is 1∶0.27∶0.43 and 1∶0.15∶0.09 respectively.The total pore volume and total pore area of coals are greater than shales and sandstones.As for the pore structure,shales have the similar structure with coals,i.e.,macropore and micropore were more developed,transitional span was middle,and the mesopore was least developed.Unlike coals and shales,the sandstones have the least developed micropore,and the macropore,mesopore and the transitional span are almost similarly developed.In the coal reservoirs,the micropore specific surface accounted for 90% proportion,in the shale and sandstone reservoirs,the proportion of micropore decreased,and the proportion of macropore,transitional span and mesopore increased.The pore structure of coals has double peak types and multi peak types,and sandstones have multi peak types.The shale reservoirs have three types of single peak and double peaks and multi peak types.In this paper,the mercury-injection curves of twelve samples are classified,the curves of coal are “parallel type” and “opposite S” type,the curves of sandstones are “M” type,the shales are “double S” type,“opposite S” type and “sharp Arris” types.

Cite this article

Yang Xiao-dong,Zhang Miao,Wei Wei,Li Juan,Fu Xue-hai . Comparison study of three natural gases reservoirs pore properties in Guxian block,Qinshui Basin[J]. Natural Gas Geoscience, 2017 , 28(3) : 356 -365 . DOI: 10.11764/j.issn.1672-1926.2017.02.017

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