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时间:2020-03-26
《贵州珠藏向斜煤样孔隙结构的差异性及其对渗流能力的影响.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、2012年9月,第l8卷,第3期,544—548页September2012,Vo1.18,No.3,P.544—548贵州珠藏向斜煤样孑L隙结构的差异性及其对渗流能力的影响常会珍,秦勇,王飞中国矿业大学资源与地球科学学院,煤层气资源与成藏过程教育部重点实验室,徐』、II221008摘要:利用压汞、低温氮吸附、扫描电镜等手段,分析了织纳煤田珠藏向斜主煤层3件煤样(青山,国安,红岩脚)的孔隙结构与渗流能力。结果表明,3件煤样均以过渡孔为主,大孔与微孔占较大比例,中孑L所占比例较低,孔比表面积都集中在过渡
2、孔和微孔上;较大孔隙为开放性孔,较小直径的孔隙主要为半开放性孔,退汞效率高,孔隙连通性较好;青山煤样和国安煤样孔径一孔容分布的连续性较好,煤层气解吸~扩散能力可能更强;红岩脚煤样大孔段孔径分布连续性极差,部分孔隙孤立发育;青山煤样大孔段孔径分布连续性相对较好,发育未被充填的微裂隙和植物细胞孑L。孔隙一裂隙的这一发育特征,可能是造成青山煤空气渗透率相对高于红岩脚煤的内在原因。关键词:珠藏向斜;煤;孔隙结构;渗透性中图分类号:P618.11文献标识码:A文章编号:1006~7493(2012)03—054
3、4—05gDifferencesinofPoreStructureofCoalsandTheirImpactonthePermeabilityaofCoalsFromtheZhu—ZangSyncline,GuizhouProvince高CHANGHuizhen,QINYong,WANGFei校fSchoolofResourceandEarthScience,KeyLaboratoryofCoalbedMethaneResourcesandReservoirFormationProcess(CUMT)
4、,地aMinistryofEducation,ChinaUniversityofMiningandTechnology,Xuzhou221008,China质Abstract:ByHseofmercuryintrusion,lownitrogenadsorptionandscanningelectronmicroscopy,theporestructureandseepage学SabilityofthreesamplesfromthemajorcoalseamintheZhu—Zangsyncline
5、oftheZhinacoalfieldwereanalyzed.Datashow报thatporeinthesamplesisdominatedbytransitionalpore,macro—andmicro—poresaccountforalargeproportions,withminormesopore.Porespecificsulfaceareacomemainlyfromthetransitionalporeandmicropore.Porewithlargediameterisopen
6、andporewithsmalldiameteissemi—open.Thesampleishigherinwithdrawalmercuryeficiencyandbetterintheporeconnectivity.DistributionoftheporesizeandvolumefromtheQinshanandGuo’ancoalmineshasawellcontinuity,indicatingastrongerdesorptionanddiffusioncapacityofcoalbe
7、dmethane.LargesizeporeoftheHongyanjiaosamplehasapoorcontinuityandsomeisolatedpores.LargesizeporeoftheQinshansamplehasarelativelygoodcontinuity,whichisresultedfromopenmicro-fracturesandplantcellpores.Differenceoftheporesandfracturesamongthreesamplesmaybe
8、thereasonfromwhichtheairpermeabilityoftheQinshansampleishigherthanthatoftheHongyanjiaosample.Keywords:Zhu—Zangsyncline;coal;porestructure;permeabilityFirstauthor:CHANGHuizhen,MasterD.candiadate;E—mail:chzhj052@126.eom收稿日期:2012—03
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