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1、北京城區(qū)地?zé)崽镂鞅辈康責(zé)岬刭|(zhì)特征柯柏林1,2(11北京市地質(zhì)勘察技術(shù)院,北京102218;21北京市華清地?zé)衢_發(fā)有限責(zé)任公司,北京102218)摘要:自2001年在北京大學(xué)成功打成地下熱水井后,北京西部隆起區(qū)的地?zé)峥碧介_發(fā)受到重視。通過對區(qū)域地質(zhì)背景條件的介紹,根據(jù)地?zé)峋@探揭露的地?zé)岬刭|(zhì)成果,對研究區(qū)的熱儲(chǔ)構(gòu)造條件、地?zé)岬刭|(zhì)特征及地下熱水地球化學(xué)特征進(jìn)行了分析研究。結(jié)果表明,八寶山斷裂的性質(zhì)具有先逆斷層后正斷層的多期活動(dòng)性特征;研究區(qū)薊縣系霧迷山組白云巖為鼻狀背斜凸起型熱儲(chǔ)構(gòu)造;深部熱流主要沿著黃莊—高麗營斷裂的上盤向上傳導(dǎo)聚集;淺部古生界碳酸鹽巖
2、地層富集強(qiáng)徑流冷地下水的作用使青白口系的地溫梯度高于北京平原區(qū),縱向地溫場坡度較北京平原區(qū)大;臨近深大斷裂構(gòu)造帶導(dǎo)致地下熱水具有放射性鐳含量高的特征;地下熱水的14C年齡特征反映城區(qū)地?zé)崽锝邮芪鞑柯∑饏^(qū)地下水的補(bǔ)給很少;地?zé)峋^分布趨勢反映霧迷山組白云巖熱儲(chǔ)地下熱水受黃莊—高麗營斷裂阻隔后由南向北方向徑流。關(guān)鍵詞:地?zé)?熱儲(chǔ)構(gòu)造;薊縣系霧迷山組;地下熱水年齡;北京中圖分類號:P314文獻(xiàn)標(biāo)志碼:A文章編號:1000-8527(2009)01-0049-08CharacteristicsofGeothermalGeologyintheNorthwes
3、ternPartoftheUrbanBeijingGeothermalFieldKEBai2lin1,2(11BeijingInstituteofGeo2explorationandTechnology,Beijing102218,China;21BeijingHuaqingGeothermalExploitationCompanyLtd,Beijing102218,China)Abstract:Moreattentionhasbeenpaidtotheinvestigationanddevelopmentofgeothermalresourcesi
4、nthenorthernupliftoftheurbanBeijinggeothermalfieldsincethegeothermalwellinPekingUniversitywassuccess2fullydrilledin2001.Regionalgeologicalconditionsofthestudyareaaredescribedinthispaper.Basedongeo2logicalsurveyofseveralgeothermalwells,thestructureofgeothermalreservoirs,geotherm
5、algeologicalcharac2teristicsandhydrochemistryofthermalgroundwaterarealsoexamined.TheresultsshowthattheBabaoshanfaultischaracterizedbymulti2activityfromareversefaulttoanormalfaultandthegeothermalreservoirconsis2tingofdolomiteoftheWumishanGroupoftheJixianSystemisanose2type2anticl
6、ineuplift.ConductiveheatflowfrombeneathmainlyflowsalongthehangingwalloftheHuangzhuang2Gaoliyingfault.ThecoldgroundwaterintheshallowcarbonateofPalaeozoicagecausesthegeothermalgradientoftheQingbaikoureservoirhigherthanthatintheBeijingplain.Thermalgroundwaternearthedeepandhugefaul
7、tshashighRacontents.14Cageofthehotwaterindicatesthatlittlerechargeoccurredinthewesternupliftedmountainarea.HydraulicheadsatthegeothermalwellsreflectaflowtrendfromsouthtonorthofthermalgroundwaterintheWumishanGroupduetotheobstructingoftheHuangzhuang2Gaoliyingfault.Keywords:geothe
8、rmalenergy;geothermalreservoir;theWumishanGroupoftheJi
