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1、鄂爾多斯東緣煤層氣勘察潛力探究 摘要：本次研究通過對鄂爾多斯東緣儲層壓力梯度、滲透率等指標的研究分析，表明鄂爾多斯盆地東緣河?xùn)|煤田臨—興區(qū)塊儲層壓力梯度為0.592-1.01MPa/100m，大多低于靜水壓力梯度；三交區(qū)儲層壓力為正常壓力至超壓，個別點為欠壓；石樓區(qū)塊4+5號、8+9號煤層平均壓力梯度分別為0.59MPa/100m，0.689MPa/100m，普遍欠壓；鄂爾多斯盆地東緣滲透性較好，多數(shù)層位的滲透率大于1×10-3μm2，但總體上各個層位的滲透性差別較大；隨著深度增加，煤層氣勘查潛力逐漸變差，依次出現(xiàn)勘查潛力級別為良級、可級和差級的區(qū)帶；鄂爾多斯盆地東緣淺部區(qū)的最北端煤
2、層氣的勘查潛力級別為良級，評價的最終綜合優(yōu)度值為55～65。從臨縣、興縣向南，煤層氣的勘查潛力級別基本為優(yōu)級，評價的最終綜合優(yōu)度值大于65；特別是在柳林-臨縣、大寧、韓城等地區(qū)，還存在綜合優(yōu)度值大于70的地區(qū)，其勘查潛力屬于優(yōu)中之優(yōu)。關(guān)鍵詞：鄂爾多斯盆地東緣；儲層物性；灰色聚類；層次分析；勘察潛力THEEASTEDGEOFORDOSCOALBEDMETHANEEXPLORATIONPOTENTIALZHOULong-fei10(ThethirdRoadandBrideDepartment,ZhongyuanOilfieldConstructionGroup,Puyang457000,C
3、hina)Abstract:Throughstudyingandanalyzingtheeastedgeofordosreservoirpressuregradientandpermeability,showthatreservoirpressuregradientis0.592-1.01MPa/100mintheeastmarginofordosbasinhedongcoalfieldlin-xingblock,Mostlylowerthanthehydrostaticpressuregradient;Sanjiaoblockreservoirpressureisnormalpres
4、suretooverpressure,individualpointsforundervoltage;Shiloublock,anaveragepressuregradientof8+9,4+5coalseamwere0.59MPa/100m,0.689MPa/100m,generallyundervoltage;Eastmarginofordosbasinhasgoodpermeability,Mostofthestratapermeabilityisgreaterthan1x10-3μm2,Butoverallthegreaterdifferencebetweenthepermea
5、bilityofstrata;Coalbedmethaneexplorationpotentialgraduallybecomeworsewiththeincreaseofdepth,prospectingpotentialinthelevelofagoodlevel,mediumandpoorzones;Coalbedmethaneexplorationpotentialisgoodlevelintheeast10marginofordosbasinshallowzoneoftheextremenorth,Evaluationofthefinalcompositepreference
6、valuesis55~65.FromLinXian,xingtothesouthcoalbedmethaneexplorationpotentialofthebasiclevelisoptimallevel,Evaluationofthefinalcomprehensivepreferencevaluesisgreaterthan65;EspeciallyingrahameLinxian,Daning,Hanchengandotherregions,therearecomprehensivepreferencevaluesisgreaterthan70region,itsbelongt
7、othebestofthebestexplorationpotential.Keywords:Theeastmarginofordosbasin;Thereservoirphysicalproperty;Greyclustering;Hierarchicalanalysis;Explorationofpotential中圖分類號：X752文獻標識碼：A1、引言此次對鄂爾多斯東緣煤層氣勘察潛力評價主要通過對其地質(zhì)資源量、資源豐度、構(gòu)造復(fù)雜程度、煤
