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1、鄂尔多斯东缘煤层气勘察潜力探究 摘要：本次研究通过对鄂尔多斯东缘储层压力梯度、渗透率等指标的研究分析，表明鄂尔多斯盆地东缘河东煤田临—兴区块储层压力梯度为0.592-1.01MPa/100m，大多低于静水压力梯度；三交区储层压力为正常压力至超压，个别点为欠压；石楼区块4+5号、8+9号煤层平均压力梯度分别为0.59MPa/100m，0.689MPa/100m，普遍欠压；鄂尔多斯盆地东缘渗透性较好，多数层位的渗透率大于1×10-3μm2，但总体上各个层位的渗透性差别较大；随着深度增加，煤层气勘查潜力逐渐变差，依次出现勘查潜力级别为良级、可级和差级的区带；鄂尔多斯盆地东缘浅部区的最北端煤
2、层气的勘查潜力级别为良级，评价的最终综合优度值为55～65。从临县、兴县向南，煤层气的勘查潜力级别基本为优级，评价的最终综合优度值大于65；特别是在柳林-临县、大宁、韩城等地区，还存在综合优度值大于70的地区，其勘查潜力属于优中之优。关键词：鄂尔多斯盆地东缘；储层物性；灰色聚类；层次分析；勘察潜力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中图分类号：X752文献标识码：A1、引言此次对鄂尔多斯东缘煤层气勘察潜力评价主要通过对其地质资源量、资源丰度、构造复杂程度、煤
