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时间:2020-06-05
《山西古交矿区中奥陶统富水性微观分析.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、第25卷3期中国煤炭地质Vo1.25No.032013年3月CoALGEOL0GYOFCHINAMar.2013doi:10.3969/j.issn.1674—1803.2013.03.09文章编号:1674—1803(2013)3-0035—04山西古交矿区中奥陶统富水性微观分析李文生,李俊杰(西山煤电集团公司地质处,山西太原030053)摘要:太原西山古交矿区是我国重要的焦煤生产基地,但煤系下伏奥陶系岩溶水严重制约煤炭资源的开采,因此,查明矿区中奥陶统富水性是目前有效开发该区域煤炭资源的重要前提。通
2、过对古交矿区GS一3号钻孔中奥陶统峰峰组、上马家沟组和下马家沟组岩石的薄片鉴定及矿物成分分析、X一荧光衍射及化学组分分析以及压汞实验分析,总结了各组岩层的富水特征:峰峰组上段矿物成分以方解石为主,孔隙直径≥101xm的孔隙体积占27%,为孔隙和岩溶较发育的含水层:峰峰组下段为石膏、硬石膏与白云岩互层,为隔水层;上马家沟组上段矿物成分以方解石和白云石为主,岩溶化程度较强,直径t>0.3txm的孔隙体积占72%,构成奥陶系岩溶水中的主要含水层;上马家沟组中下段及下马家沟组中下段以白云质灰岩及白云岩为主,可视
3、为隔水层段。关键词:,薄片鉴定;X一荧光衍射;压汞试验;中奥陶统;富水性;微观分析;古交矿中图分类号:P641.134文献标志码: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
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