陇东盆地白垩系含水层水文地质参数求解

第42卷第1期煤田地质与勘探Vol.42No.12014年2月COALGEOLOGY&EXPLORATIONFeb.2014收稿日期:2012-10-26基金项目:(1212010813099)作者简介:(1972—).文章编号:1001-1986(2014)01-0035-05陇东盆地白垩系含水层水文地质参数求解刘心彪，张永军(甘肃省地质环境监测院，甘肃兰州730050):陇东盆地水资源短缺，严重制约着经济发展，近年来探明白垩系洛河组地层赋存巨厚深层地下淡水。含水层水文地质参数的求解是深层地下水资源评价的关键，用抽水试验确定深层承压含水层水文地质参数是水文地质勘查研究的一项重要的内容。根据单孔、多孔、干扰抽水试验资料，采用稳定流、非稳定流多种方法求解陇东盆地深层含水层水文地质参数，避免了单一方法的偶然性、随意性，计算结果可信。最后探讨了抽水试验场地水文地质条件与所选取公式理论条件的差异对计算结果的影响。：典型勘查区；抽水试验；水文地质参数：P641.1：ADOI:10.3969/j.issn.1001-1986.2014.01.008SolutionofhydrogeologicalparametersoftheCretaceousaquifersinLongdongbasinLIUXinbiao,ZHANGYongjun(GeologicalEnvironmentMonitoringInstituteofGansuProvince,Lanzhou730050,China)Abstract:WaterresourceshortageisseriouslyrestrictingtheeconomicdevelopmentinLongdongbasin,butsincerecentyears,explorationhasprovedverythickundergroundfreshwaterinCretaceousLuoheFormation.Itisthekeytosolvethehydrogeologicalparametersforassessmentofdeepgroundwaterresources.Pumpingtestusedtodeterminetheaquiferhydrogeologicalparametersconstitutestheimportantcontentinhydrogeologicalinvestiga-tion.Accordingtopumpingtestdataofsinglewell,multiplewellsandinterferencewell,variousmethodsforsteadyandunsteadyflowhavebeenadoptedtosolvethehydrogeologicalparametersofaquifer,avoidingcontin-gency,randomnessofasinglemethod,andthecalculationresultsarereliable.Finally,thepaperdiscussedthein-fluenceofthedifferenceofhydrogeologicalconditionsatpumpingtestsiteandthetheoreticconditionsofthese-lectedformulaonthecalculationresults.Keywords:typicalexplorationarea;pumpingtest;hydrogeologicalparameters[1]1勘查区概况16km526.7mm7—92.428m3[2]·36·煤田地质与勘探第42卷3(k1l)420m550~970m1g/L5000m3/d1077.4m(k1h)460m60~550m3.59g/L450m3/d63m(k1lh)20m1.7‰2抽水试验Q5Q7Q7Q5280.38m273mm216mm201111—12Q7Q5Q5Q7Q5Q7Q51885m3/dQ75349m3/d123468101520253040506080100120min30min2011111227d17d5d5d3水文地质参数求解[3-4]3.13.1.1渗透系数Q7Q5K1w1wln2π()rQKMssr=−(1)Km/dQm3/dswms1mr1mrwmMm3.1.2影响半径()RRRsQtQQ5Q7w11ww1lglglgsrsrRss−=−(2)Rm1表1稳定流水文地质参数计算结果表Table1CalculationresultsofhydrogeologicalparametersforsteadyflowQ/(m3·d−1)sw/ms1/mr1/mrw/mM/mK/(m·d−1)R/mQ51885.012.581.42280.380.1084180.508762.40Q75349.033.013.84280.380.1084180.549789.253.23.2.1降深-时间配线法lgs-lgt(1)W(u)-1/uTu*lgs-lgtW(u)-1/u[W(u)][1/u][s][t](3)(4)Tu*(2)[][]()4πQTWus=(3)[]24*1()Ttruμ=⎡⎤⎢⎥⎣⎦(4)Tm2/du*()rm3.2.2降深-时间(s-lgt)直线图解法(2)i()t0(5)(6)(3)第1期刘心彪等:陇东盆地白垩系含水层水文地质参数求解·37·1Fig.1Figureofwiringmethod表2配线法水文地质参数计算结果表Table2ThecalculationresultsofhydrogeologicalparametersbywiringmethodQ/(m3·d−1)r/m[W(u)][1/u]Q7Q55349.0280.38110Q5Q71885280.38110[s]/m[t]/minT/(m2·d−1)u*/10−4Q7Q50.77167552.823.26Q5Q70.25178535.743.370.183QTi=(5)022.25*Ttrμ=(6)3.2.3水位恢复法QQt5r2/a222.3lg2.254π0.183lg2.250.183lgQatstrQaQtTTr=⋅=+(7)am2/d2Fig.2Calculationchartofthelineargraphicmethod表3直线图解法水文地质参数计算结果表Table3Thecalculationresultsofhydrogeologicalparame-tersbythelineargraphicmethodQ/(m3·d−1)r/mit0/minT/(m2·d−1)u*/10−4Q7Q55349.0280.381.8740523.454.16Q5Q71885.0280.380.6746514.854.76ts(s0)()i=0.183Q/TT=0.183Q/i(8)t1s-lgtt1Δs1101120.183lg2.25sssatQTrΔ=−=(9)t=t2t1t2201210.183(lglg)sssQttTΔ=−=−(10)(8)(9)0112221110lg2.25sssstratt−−=××(11)u*=T/a(12)st(3)(8)(11)(12)(4)3.35·38·煤田地质与勘探第42卷3Fig.3Calculationchartbywaterlevelrecovery1.33m/d(5)nMr1,r2,,rnQ1,Q2,,QnMn表4水位恢复法水文地质参数计算结果表Table4ThecalculationresultsofhydrogeologicalparametersbywaterlevelrecoveryQ/(m3·d−1)R/mis0/ms1/ms2/mt1/mint2/minT/(m2·d−1)u*/10−4Q7Q55349280.381.593.833.111.541001000623.484.3Q5Q71885280.380.611.861.5811001000594.453.93表5水文地质参数计算成果汇总表Table5SummaryofhydrogeologicalparametercalculationresultsR/mK/(m·d−1)T/(m2·d−1)a/(106m2·d−1)u*/10−4762.400.508789.250.549775.80.5281.31552.821.693.261.27535.741.593.371.24523.451.264.161.22514.851.093.751.48623.481.454.301.41594.751.513.931.32557.501.433.798001.33560.001.353.80M[5]()1114πnniiiiissQWuT==⎡⎤==⎣⎦∑∑(13)2244iirriSuTtat==ui0.01211212.32.25lg4π2.32.252.3lglg4π4πnniiiiinniiiiatssQTraQQtTTr==⎡⎤==⎢⎥⎢⎥⎣⎦=+∑∑∑∑(14)(14)Q5(4)Q54Fig.4Verificationofhydrogeologicalparameters第1期刘心彪等:陇东盆地白垩系含水层水文地质参数求解·39·4求解方法探讨(rMrw)()()s1“”5结论参考文献[1].[J].200623(3)506−512.[2][J].200926(2)176−180.[3].[M].2001.[4].[M].1991.[5].[M].1983.(上接第34页)[19]LIHuoyinOGAWAYSHIMADAS.Mechanismofmethaneflowthroughshearedcoalsanditsroleonmethanerecovery[J].Fuel2003821271–1279.[20].[J].201242(10)1487−1495.[21].[J].200631(3)342−345.[22].Raman[J].200919(10)1117–1125.[23].—[J].199266(2)148–157.[24]GAMSONPBEAMISHBJOHNSOND.Coalmicrostructureandmicropermeabilityandtheireffectsonnaturalgasreco-very[J].Fuel19937287–99.[25].[J].199322(A12)71–77.[26]GAMSONPBEAMISHBJOHNSOND.Coalmicrostructureandsecondarymineralizationtheireffectonmethanereco-very[J].GeologicalSocietyofAmericaBulletin1996109165–17.[27].—[J].201035(1)150–157.[28].[J].200960(4)995−1000.