第29卷第6期 Vol.29,No.6石 油 实 验 地 质 2007年12月PETROLEUMGEOLOGY&EXPERIMENTDec.
DISCUSSIONONTHEAPPLICATIONOFTHEROCK
MAGNETICFABRICMETHODINRESUMING
PALEOTECTONICSTRESSFIELDINSEDIMENTARYBASIN
ZengLianbo,QiJiafu
(KeyLaboratoryforHydrocarbonAccumulationMechanismoftheChineseMinistry
ofEducation,ChinaUniversityofPetroleum,Bejing102249,China)
Abstract:Thequantitativeresumptionofthepaleotectonicstressfieldinthesedimentarybasinhaslongbeenadifficultproblemduetotheshortageofthestresssymbols.Inordertoprobethefeasibilityofusingrockmagneticanisotropytoresumethedirectionofthemaximumprinciplestressofthepaleotec2tonicstressfieldinsedimentarybasin,anexperimenthasbeenmadeatfirsttoinvestigatethechangeofthemagneticanisotropybeforeandaftertherockisslowlypressurizedanddeformed.Aftertherockispressurized,themagneticanisotropyparametersofH,Pandqincreaseaccordingly,themaximumandtheminimumprincipalaxesofthemagneticsusceptibilityalsochangesignificantly,indicatingthatthetectonicdeformationprocessintheshallowformationmayexertobviousinfluencesontherockmagneticanisotropy.AcomparisonanalysisbetweenthedirectionofthemaximumprincipalcompressionstressdeterminedbytheminimumprincipalaxisofmagneticsusceptibilityandthatdeterminedbythetectonicdeformationanalysiswerethencarriedoutinthenorthernTarimBasin.Theresultsshowthatthetwoisroughlyconsistent,suggestingthat,intheareawithstronglydeformedstructures,itisfeasibletousethedirectionoftheminimumprincipleaxisofmagneticsusceptibilityindetermingthedirectionofthemaximumprincipalcompressionstressofthemagneticsusceptibilityofthepaleotectonicstressfieldinthesedimentarybasins.Atlast,somerelatedissuessuchastheapplicablescopeofthismethodandthestagedivisionofthetectonicstressfieldhavebeendiscussed.
Keywords:magneticfabric;minimumprincipalaxisofmagneticsusceptibility;directionofmaximumprincipalcompressionstress;paleotectonicstressfield;sedimentarybasin;theTarimBasin
收稿日期:2006-09-23;修订日期:2007-11-08。
),男(汉族),湖南沅江人,博士,教授,主要从事油气构造地质学的教学和科研工作。作者简介:曾联波(1967—
基金项目:石油科技中青年创新基金项目(CX2000-39)和国家重点基础研究发展规划项目(G19990433)。
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