收稿日期: 2016-07-21
修回日期: 2016-09-11
网络出版日期: 2017-03-10
基金资助
山西省科技厅“煤层气、页岩气资源潜力评价及共探共采选区研究”(编号:MQ2014-02)资助.
Comparison study of three natural gases reservoirs pore properties in Guxian block,Qinshui Basin
Received date: 2016-07-21
Revised date: 2016-09-11
Online published: 2017-03-10
孔隙发育特征对非常规天然气赋存和运移有着重要的影响。采用高压压汞实验对沁水盆地古县区块煤系煤、泥页岩、砂岩等12件样品孔隙特征进行了对比研究。结果表明:煤、泥页岩、砂岩压汞孔隙度之比为1∶0.49∶0.78；孔容中值孔径和比表面积中值孔径之比分别为1∶1.64∶15.43和1∶1.63∶2.73；总孔容、总比表面积比值分别为1∶0.27∶0.43和1∶0.15∶0.09。煤储层总孔容、总比表面积均远大于泥页岩和砂岩储层；泥页岩储层孔径结构整体与煤储层相似，大孔和微孔发育，过渡孔次之，中孔最差；砂岩储层微孔发育极差，大孔、中孔和过渡孔同等发育。煤储层微孔比表面积占绝对优势，泥页岩和砂岩储层微孔所占比例有所降低，而大孔、中孔和过渡孔的比例均有明显增加；煤储层孔径结构表现为“双峰型”和“多峰型”，砂岩储层为“多峰型”，泥页岩“单峰型”、“双峰型”、“多峰型”均有出现；煤储层压汞曲线主要为平行型和反S型，砂岩储层主要是M型，泥页岩储层主要为双S型、反S型和尖棱型。
杨晓东，张苗，魏巍，李娟，傅雪海 . 沁水盆地古县区块煤系“三气”储层孔隙特征对比[J]. 天然气地球科学, 2017 , 28(3) : 356 -365 . DOI: 10.11764/j.issn.1672-1926.2017.02.017
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.
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