地层自然造斜特性的测井评价方法研究

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1、第29卷第6期石油学报Vol.29No.62008年11月ACTAPETROLEISINICANov12008文章编号:025322697(2008)0620927206地层自然造斜特性的测井评价方法研究高德利代大良潘起峰(中国石油大学石油工程教育部重点实验室北京102249)摘要:地层可钻性各向异性及造斜特性评价对定向钻井和直井防斜均具有重要意义。用数理统计的方法分析了垂直于层面和平行于层面岩石可钻性的相关关系,用垂直于层面岩石可钻性的评价方法评价了平行于层面岩石可钻性,由此导出根据垂直于层面岩石的可钻性评价地层可钻性各向异性的模型。根据声波在横观各向同性介质中

2、的传播规律,建立了利用测井资料反演岩石的各向异性参数进而求取垂直于层面声波波速的方法。由垂直于层面方向的声波速度计算出垂直于岩石层面方向的岩石可钻性,从而可以对地层可钻性各向异性及造斜特性进行评价。对塔里木油田克拉苏地区的造斜特性的评价结果表明:用该方法评价出的地层可钻性各向异性及造斜特性能正确反映被评价地层的特性。关键词:测井资料;岩石可钻性;各向异性;造斜特性;井斜控制;评价方法中图分类号:P63118文献标识码:AEvaluationofdeflectingcharacteristicsofanisotropyformationbyusingwell2log

3、informationGAODeliDAIDaliangPANQifeng(KeyLaboratoryforPetroleumEngineeringoftheMinistryofEducation,ChinaUniversityofPetroleum,Beijing102249,China)Abstract:Theevaluationofdrillabilityanisotropyanddeflectingcharacteristicsofformationisveryimportantfordirectionaldrillinganddeviationcontr

4、olofhorizontalwell.Thecorrelationofrockdrillabilityinperpendicularandparalleldirectionsofthebeddingplaneofcoresampleswasanalyzedbymeansofmathematicalstatistics.Amathematicmodelwasestablishedandappliedtopredic2tionofdrillabilityinparalleldirectiontothebeddingplaneofformationbyusingdril

5、labilityinperpendiculardirectiontothebeddingplaneofformation.Thusthemathematicmodelcanpredictanisotropyofdrillabilitybyusingrockdrillabilityinperpendiculardirec2tiontothebeddingplaneofformation.Therockanisotropicparameterswereinversedbyusingwell2loginformation,andacousticwavevelocityi

6、nperpendiculardirectiontothebeddingplaneofaformationwascalculatedbyusingacousticwavevelocityinanydi2rectionofthebeddingplaneofaformation.Therockdrillabilityinperpendiculardirectionofthebeddingplaneinaformationcanbecalculatedbyusingacousticwavevelocityinthesamedirection.Theevaluationme

7、thodsfordrillabilityanddeflectingcharacteristicsofanisotropyformationbyusingwell2loginformationasinputwereusedtoestimatethedrillabilityanisotropyanddeflectingcharac2teristicsofformationwithhighstratigraphicdipinKelasuareaofTarimBasin.Theresultshowsthatanisotropyindexesofforma2tiondril

8、labil