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Characterization of deep ground geothermal field in Jiahe Coal Mine

By Jane Howard,2014-11-19 05:56
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Characterization of deep ground geothermal field in Jiahe Coal Mine

    Characterization of deep ground

    geothermal field in Jiahe Coal Mine

    MiningScienceandTechnology(China)21(2011)371374

    ARTICLEINF0

    Articlehistory:

    Received12October2010

    Receivedinrevisedfom9November2010 Accepted7December2010

    Availableonline17June2011

    Keywords:

    Deepmine

    Geothermalfield

    Heatdamage

    Function

    1.Introduction

    ABSTRACT

    Researchintothecharacteristicsofgeothermalfieldsisimportantforthecontrolofheatdama

    gein

    mines.Basedonmeasuredgeothermaldataofboreholesfrom-200mto1200minaIiaheCoalMine.

    wedemonstratenon-linearbutincreasingrelationsofbothgeotemperatlaresandgeothermalgradients withincreasesdepth.Numerically,wefittedtherelationshipbetweengeotemperaturesanddepth.

    a

    first-orderexponentialdecaycurve.formulatedas:h)=4.975+23.O8×exp(-hi1736.1).

@2011PublishedbyElsevierB.onbehalfofChinaUniversityofMining&Technology.

    Thegeothermalfieldofamineisintheshallowpartoftheearth crest.affectedbydeepgeothermalandregionalgeologicstructures anddisturbedbyfactorssuchastheactivitiesofunderground waterandlocalheatsourcesf161.111erefore.theconditionofdif-

    ferentgeothermalfieldsisnotonlyaffectedbyvariousgeotectonic elementsanddepth,butalsobythedifferentgeologicstructuresof theshallowpartoftheearthcrest.giventhesamegeotectonicele

    mentsandgeothermalbackgroundsatthesamedepth.Factors whichstronglydisturbageothermaIfieldmaycausesignificant changesinthefieldf7101.

    TheliaheCoalMine,IocatedintheXuzhouminingarea.isclas

    siftedintosubstratumdepressionsintermsofitsgeothermalfield. Itsgeologyischaracterizedbylargeandmediumsizedsettlement zones.situatedinastableplatformblock.withdeepcrystalsub

    strates.Paleozoic.MesozoicandCenozoicerathemsedimentary basinshavebeenformedoverit11131.Actualmeasureddata

    inthismineshowthat.ingenera1.noheatdamageOCCURSwhen miningdepthislessthan-500to-600m.butmayOccurwhen miningOccursatevenlowerlevels.

    Analysisofthecharacteristicsofthisgeothermalfieldisimpor

    tantforprovidingdirectionandinformationinordertocontrol heatdamage.Wepresentacasestudyconductedinthismine.to investigatethecharacteristicsofitsgeothermalfieldandobtaining $Correspondingauthor.Te1.:+8613811696735.

    E-mailaddress:songshu770209@126.com(Zhang).

    atheoreticalknowledgebaseforheatdamagecontrolindeep mining.

    2.CharacteristicsofadeepgeothermalfieldintheJiaheCoal Mine

    Inordertoanalyzethedistributionofthegeothermalfield between-200mand1200mintheJiaheCoalMine,22holeswere boredtodifferentdepthsfortemperaturemeasurementswithinthe miningfield.ThesemeasurementsarepresentedinTable1. 2.I.Analysisofcharacteristicsongeothermalchange Curvesshowinggeothermalchangesforeachholefrom-200m to——1200mhavebeendrawnfromTable1.Weonlyshowfour Curves,allwithsimilarcharacteristics.

    ThedatafromTable1havebeenplottedasFig.1showingsharp geothermaltemperatureincreaseswithincreasingdepth.Thesein

    creasesarenonlinear.

    UsingdatafromTable1canalsobeusedtoshowgeothermal variationingroundtemperaturesatdepthsfrom-200mto

    1200m(seeFig.2).

    AsshowninCurve5.eachstratuminacertaindepthhasits rangeoftemperaturechangesrespectively,whichshowsuniform distributionfeaturesofthegeothermaltemperaturewithineach rockstratum.Oscillatingtrendcanbeseenfromgeothermaltem. peraturechangecurvesinthespecificdepthandthefluctuationle

    velisincreasedwiththeincreaseofdepth.thatis.geothermal temperaturesurgeswiththeincreaseofminingdepth.which meansnonlinearincreaseforgeothermalgradient. 167452641$

    seefrontmatter@2011PublishedbyElsevierB.V.onbehalfofChinaUniversityofMining&a

    mp;Technology

    doi:10.1o16~.mstc.2011.05.013

    

    372

    Table1

Temperaturecontrastsatsamedepths(.c).

    Y.Zhangeta1./MiningScienceandTechnology(China)21(2011)371374

    (a)

    曼一

    ?

    争一

    

    l

    

    1

    Tmpeat"re(?'(b)Temperature(?)(c)Temperature(?(d)Temperature(() 183134.3740431922252831.34374043192225283134374043,l92225283l34374043

    200r——————一200_—————一.200?—————一.2()o厂————

    ——:}.

    }}.,}'I0lI,{

    6OO},三一60()},,,三一6O0},,三一6o0}

    800

    },-800},,喜一soo},\,,-800}'...

    ...},,000},,,-10~}i200}

    1200l}\1200}1200}

    Fig.1.Variationingroundtemperature.(a)Well1812.(b)Well1814.(c)Well20

    11,(d)WellSupl0

    2.2.Analysisofcharacteristicongeothermalgradientchange Geothermalgradientisthedirectreasonforheattransfer141.

    Heattransferamongstrataincreaseswiththeincreaseofgeother

    maigradient.whichresultsinmoreevidentheatexchangef151. Therefore.inordertogetaclearerpictureaboutthedistribution ofgeothermaltemperatureinJiaheCoalMine.geothermalgradient ofeachholearelistedstatisticallyinTable2.

    Curveofgeothermalgradientchangeofeachholefrom——200m to1200mcanbeobtainedfromTable2.Onlyfourcurvesare

    Nutuber

    

    --200m

    

    ?-300m

    

    ?一—4O0m

    

    '--5O0m

    

    ?-600m

    :一

    7OOm

    -

    800m

    -

    0-9OOm

    

    舟一一l000m

    

    ?一一11O0m

    

    ?一一1200m

    Fig.2.Variationingroundtemperatureatdifferentdepths.

    showninthispapersincesimilarchangecharacteristicsforall

    thecurves.

    AccordingtotheanalysisontheCurvesfromFig.3ad.geother malgradientgenerallyshowsnonlinearincreasewiththeincrease

ofstratumdepth.

    Thecurveofgeothermalgradientchangefrom200mto

    

    1200minJiaheCoalMinecanalsobeavailablebasedonthedata inTable2(seeFig.4).

    AsshowninFig.4.mostofgeothermalgradientvaluesare,at therangeof1.0.c/toomand2.5.C/lOOm.indicatingthatgeo

    thermalchangesfrom-200mto1200minIiaheCoalMineare

    wellproportioned.Accordingtofurtheranalysisofthechanges ofgeothermalgradientcurvesfromdifferentdepth.geothermal gradientincreaseswithincreaseofdepthandnonlinearincrease canbeseenfromthecurve.

    3.Relationshipbetweengeothermaltemperatureandthedepth ofdeeppartsinJiaheCoalMine

    FromdataobtainedintheJiaheCoalMineandgiventheanaly

    sisofchangesingeothermaltemperaturesandgeothermalgradi

    ents.wefittednumericallyafirstorderexponentialattenuation curve.Fig.5showstherelationshipbetweenthegeothermaltem

    peratureanddepthofthemine,whichisexpressedas: T(h)=4.975+23.08×exp(h/1736.1)

    ^2j(IlIIu

    TbIe2

    Geothermalgradients.

    Zhangeta1./MiningScienceandTechnology(China)21f201J371374373

    (a)

    203O0m

    

    4OO-500m

    600-700m

    800-900

100OI10Om

    Fig.3.Variationingeothermalgradient.(a)Well1812,(b)Well18-14.(c)Well20

    11.(d)WellSupl0.

    26

    Number

    _..700..800m

    .

    800.900m

    

    ?一一900..1000m

    .

    1000.l100m

    

    .

    1100.12o0m

    Fi4.Variationingroundgradientatdifferentdepths. Asindicatedinthecurve,thecurveshowsapproximatelyline- arlychangesforthedepthfrom-200mto700m,tobespecific:

    forshallowpartabove700munderground,thecurveshows

    basicallylineardistribution,whilethecurvechangefordeep mining(inthedepthof=700mto1200m)isasfollows:the

    Temperature(?)

    20242832364044

    Fig.5.GeothermaltemperatureasafunctionofdepthinJiaheCoalMine geothermaltemperatureincreaseswiththeincreaseofdepthand temperaturegradientshowsnonlinearincreasewiththeincrease ofdepth.

    4.Conclusions

    (1)GeothermaltemperatureinJiaheCoalMineincreaseswith theincreaseofdepth,SOdoesthegeothermalgradient.with

    thefeaturesofnonlinearincreaseintermsofincreasing depth.

    o瑚伽鲫咖

    一昌一专o0

    432?O

    u2j_8

    mmmmm

    OOOOO?们?印

    .一一-.

    .一一--?????

    23456

    -_一一

    卜卜

    一一一一一

    374YZhangeta1./MiningScienceandTechnology(China)21(2011)371374

    (2)Generally,theincreaseofgeothermaltemperatureshows approximatelylinearwhenthedepthofJiaheCoalMine above700mwhileitisnonlinearwhenthedepthexceeds -

    700m.therelationshipbetweengeothermaltemperature anddepthisformulatedbyEq.(1).

    Acknowledgments

    Financialsupportforthisproject.providedbytheNationalBasic ResearchProgramofChina(No.2006CB202200),theKeyProjectof NationalNaturalScienceFoundationofChinaandtheProgramfor Chang1iangScholars.InnovativeResearchTeaminUniversityof ChinafNo.IRT06561andtheFundamentalResearchFundsforthe CentralUniversities(No.2010QL04).isgratefullyacknowledged. ThanksPro.GongWeIlif0rhishelpinEnglishandprofessional knowledge.

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