基于水力压裂的瓦斯抽采储层研究以焦作矿区二1煤层为例

24620126CoALGEOLOGYOFCHINAV0124No06Jan2012doi103969fjissn1674-1803201206051674-1803(2012)06-0018-04(451191)I++I+I++P61811AAStudyonHydraulicFracturingGasDrainageReservoir-ACaseStudyofCoalSeamHIinJiaozuoMiningAreaHuangBoSongZhiminNiuYaliYangXiaonaandQuYanwei(DepartmentofResourcesandEnvironmentEngineeringHennaInstituteofEngineeringZhengzhouHenan451191)AbstractThecoalseaIllHIintheShanxiFormationJiaomominingareahaswelldevelopedtectonicallydeformedcoalAccordingtoundergroundobservationandIoggingtrBce$MenfificationteetonieallydeformedcoaltypesIandIIaxedistributedinlowerpartofthecoal$eaiwhiletypesIIlandIVinupperandtoppartsThmnghanalysisofcoalandrockmechanicalpropertieswatersensitivityandhydrogeologicalconditionimpactonthegasdrainagehydraulicfracturing,consideredthatthedifferencebetweenmechanicalpropertiesofcoalIllandfloorrockisnotlargebutalsocloselyintegratedthustheirfracturedfissurescanbeeasilyhnkedthecoalandrockwatersensibilitycalveshavedemonstratedthattheirwatersensibilitiesal'eweakTheestimatedfloorsafethicknessofaquifugeislessthanactualaquifugethicknesssafewaterheadpressurelargerthanactualbearingpressureThusthreefracturingdrainagereservoirtypesofroof+typeIII+typeIVdeformedcoalstypeI+typeIIdeformedcoalsandtypeI+type11deformedcoals+floorhavebeenestablishedKeywordsdrainagereservoir,tectonicallydeformedcoalhydraulicfracturing0L()f)(198)2009j2012_022961788m+70680m1()()6191111130cm20era150cm22m08m(1)m5030O2030810cm30507IOem2203012lOem1Figure1Coalma$texture1ithotypeofcoalandfracturedevelopmentfeaturescohunn112(1)I2m12221Table1Interpretedresultoftt0Ilicmlydeformedcoalincoalse11l2Table2Rockmechanicalproperties13()4MPa421KCl224KCl0814(24KClKr_-4KCImDKcfmD2rtgure2WatersensibilityttiIcurvesof81roofandfloormudstone)(!!)4K,mLmrMNm3KD_MPapMPa33Table3Coalfaceestimatedsafeaquifugethicknessinstudyare8P=TMP_MPamZ006MPam01MPam44Table4CoalfaceestimatedsafewaterheadpressueinstudyareaMPa2IL3(3)12m2m=i3Figure3GeometricmodelofstudycoaIlnimgasdrahmgereservoir6g--212mI+2m2mI++2-(I+II)(2)()II2m---hI2m00050038mDl++(2m)2mII23I3++I+I++llJUJ20lo35(8)132913222200530(3)319-3213IM19904R20055[M|E2009f6J201I,23(4)