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1、第38卷第3期煤炭学报Vol.38No.32013年3月JOURNALOFCHINACOALSOCIETYMar.2013文章编号:0253-9993(2013)03-0441-07不同煤储层条件下煤岩微孔结构及其对煤层气开发的启示1,2323范俊佳,琚宜文,柳少波,李小诗(1．北京大学地球与空间科学学院,北京100871;2．中国石油勘探开发研究院提高石油采收率国家重点实验室,北京100083;3．中国科学院计算地球动力学重点实验室地球科学学院中国科学院研究生院,北京100049)摘要:在现场宏观观测
2、的基础上,采用显微镜下观测、镜质组反射率测试及低温氮吸附方法,对沁水盆地和淮北煤田不同矿区煤岩的变质变形作用与微孔结构特征进行了深入研究。结果表明:高变质强变形—较强变质煤储层(Ⅰ类)和中变质较强变形煤储层(Ⅲ类)有利于煤层气的富集,不利于煤层气的扩散和渗流;高变质弱变形煤储层(Ⅱ类)和中变质弱变形煤储层(Ⅳ类)较有利于煤层气的富集,也有利于煤层气的渗流;低变质强变形煤储层(V类)有利于煤层气的富集,但不利于煤层气的解吸和渗流。由此,沁水盆地南部及淮北煤田中南部是煤层气勘探开发的有利区域。关键词:煤储层
3、;微孔结构;煤层气;变质作用;变形作用中图分类号:P618．11文献标志码:AMicroporestructureofcoalsunderdifferentreservoirconditionsanditsimplicationforcoalbedmethanedevelopment1,2323FANJun-Jia,JUYi-wen,LIUShao-bo,LIXiao-shi(1．SchoolofEarthandSpaceSciences,PekingUniversity,Beijing100871,C
4、hina;2．StateKeyLaboratoryofEnhancedOilRecovery,ResearchInstituteofPe-troleumExplorationandDevelopment,Beijing100083;3．KeyLaboratoryofComputationalGeodynamics,ChineseAcademyofSciences,CollegeofEarthSci-ence,GraduateUniversityofChineseAcademyofSciences,Bei
5、jing100049,China)Abstract:ThispaperanalysedmicroporestructureofcoalsamplesfromcoalminesofQinshuibasinandHuaibeicoalfieldbyusingmicro-macroscopicobservation,Rtesting,andlowtemperaturenitrogenadsorptionmethod.Resultsoindicatethattherearefivedifferentcoalre
6、servoirtypesinthestudyareas.Highgrademetamorphicandrelativelystrongtostrongdeformedcoalreservoir(typeI)andmediumgrademetamorphicandrelativelystrongdeformedcoalreservoir(typeIII)arefavourableforcoalbedmethane(CBM)accumulation,butdisadvantageoustoCBMseepag
7、e;highgrademetamorphicandrelativelyweakdeformedcoalreservoir(typeII)andmediumgrademetamorphicandrel-ativelyweakdeformedcoalreservoir(typeIV)areadvantageoustoCBMaccumulationandseepage;lowgrademeta-morphicandstrongdeformedcoalreservoir(typeV)isfavourablefo
8、rCBMaccumulation,butnotadvantageoustoCBMdesorptionandseepage.Consequently,southernpartofQinshuibasinandsouth-centralofHuaibeicoalfieldarepotentialareasforcoalbedmethaneexplorationanddevelopment.Keywords:coalreservoir;micro
