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1、第25卷3期中國煤炭地質(zhì)Vo1.25No.032013年3月CoALGEOL0GYOFCHINAMar.2013doi:10.3969/j.issn.1674—1803.2013.03.09文章編號:1674—1803(2013)3-0035—04山西古交礦區(qū)中奧陶統(tǒng)富水性微觀分析李文生,李俊杰(西山煤電集團公司地質(zhì)處,山西太原030053)摘要:太原西山古交礦區(qū)是我國重要的焦煤生產(chǎn)基地,但煤系下伏奧陶系巖溶水嚴重制約煤炭資源的開采,因此,查明礦區(qū)中奧陶統(tǒng)富水性是目前有效開發(fā)該區(qū)域煤炭資源的重要前提。通
2、過對古交礦區(qū)GS一3號鉆孔中奧陶統(tǒng)峰峰組、上馬家溝組和下馬家溝組巖石的薄片鑒定及礦物成分分析、X一熒光衍射及化學(xué)組分分析以及壓汞實驗分析,總結(jié)了各組巖層的富水特征:峰峰組上段礦物成分以方解石為主,孔隙直徑≥101xm的孔隙體積占27%,為孔隙和巖溶較發(fā)育的含水層:峰峰組下段為石膏、硬石膏與白云巖互層,為隔水層;上馬家溝組上段礦物成分以方解石和白云石為主,巖溶化程度較強,直徑t>0.3txm的孔隙體積占72%,構(gòu)成奧陶系巖溶水中的主要含水層;上馬家溝組中下段及下馬家溝組中下段以白云質(zhì)灰?guī)r及白云巖為主,可視
3、為隔水層段。關(guān)鍵詞:,薄片鑒定;X一熒光衍射;壓汞試驗;中奧陶統(tǒng);富水性;微觀分析;古交礦中圖分類號:P641.134文獻標志碼:AMicro-analysisofMiddleOrdovicianSeriesWaterYieldPropertyinGujiaoMineArea,ShanxiLiWensheng,LiJunjie(GeologicalDivision,XishanCoalElectricityGroupCo.Ltd.,Taiyuan,Shanxi030053)Abstract:TheGuj
4、iaomineareainTaiyuanisoneofimportantcokingcoalproductionbasesinChina.ButbecauseofthecoalmeasuresunderlyingOrdoviciankarstwaterhasseriouslyrestrictedtheminingofcoalresources,tofindouttheMiddleOrdovicianSerieswateryieldpropertyisanimportantprerequisitetoef
5、fectivelyexploitcoalresourceinthearea.Throughrockthinsectionidentificationandmineralcomposition,X—rayfluorescencediffractionandchemicalcomponent,mercuryinjectionexperimentanalysessummedupwateryieldpropertiesofeachstratagroup.Themineralcompositionoftheupp
6、ermemberofFengfengFormationismainlycalcitewithvolumeofdiameter≥lOIxmporesaccountedfor27%.thusaporeandkarstratherdevelopedaqui~r.ThelowermemberofFengfengFormationisinterlayeredgypsum,anhydriteanddolomite,thusanaquifuge.Themineralcompositionoftheuppermembe
7、rofShangmajiagouFormationismainlycalciteanddolomitewithratherstrongka~tifieddegree,volumeofdiameter1>0.3p,mporesaccountedfor72%,thusthemainaquiferofOrdoviciankantwater.ThemiddleandlowermembersofShangmajiagouFormationandthemiddleandlowermembersofXiamajiag
8、ouFormationismainlydolomiticlimestoneanddolomite,canberegardedasaquifuge.Keywords:thinsectionidentification;X—rayfluorescencediffraction;mercuryinjectionexperiment;MiddleOrdovicianSeries;wateryieldproperty;micro—analysis;G