测井技术WELLLOGGINGTECHNOLOGYVol.47No.2Apr2023第47卷第2期2023年4月文章编号：1004-1338（2023）02-0146-06砂岩地层中地层因素表征及其与孔喉比关系分析许赛男，张建升，时新磊，陆云龙（中海石油（中国）有限公司天津分公司，天津300459）摘要：多孔介质的导电特性主要受其孔隙结构的影响，孔隙结构通常用孔隙和喉道尺寸及迂曲度来描述。为简化运算，现有导电模型通常忽略喉道的影响。为准确描述孔隙和喉道在多孔介质中的导电机理，明确孔隙和喉道尺寸及迂曲度对地层因素的影响，提出基于正弦曲线孔隙结构的正弦模型，并通过该模型推导出地层因素的表达式。构建数字岩心，利用数字岩心数值模拟结果，对模型进行验证。结果表明：基于正弦模型的地层因素表达式能准确反映地层的导电特征，地层因素与孔隙度、孔隙形状校正因子、迂曲度和孔喉比有关，当其他因素基本一致时，地层因素随着孔喉比的增大而增大。关键词：地层因素；孔喉比；数字岩心；迂曲度；孔隙结构中图分类号：P631.84文献标识码：ADoi：10.16489/j.issn.1004-1338.2023.02.004AnalysisofFormationFactorExpressioninSandstoneFormationandItsRelationshipwithAspectRatioXUSainan,ZHANGJiansheng,SHIXinlei,LUYunlong(TianjinBranch,ChinaNationalOffshoreOilCorporation,Tianjin300459,China)Abstract:Theelectricalconductivityofporousmediamainlydependsontheporestructureoftheporousmedia,andtheporestructureistraditionallycharacterizedbythepore-throatsizeandtortuosity.Inordertosimplifycalculation,theexistingmodelsusuallyignoretheinfluenceofthroats.Inordertoaccuratelydescribetheconductivemechanismofporesandthroatsandclarifytheinfluenceofpore-throatsizeandtortuosityonformationfactorinporousmedia,anewmodelwithsinusoidalpore-throatstructureisproposedandtheexpressionofformationfactorisderivedbasedonthisnewmodel.Digitalcoresareconstructedandthenumericalsimulationresultsofdigitalcoresareusedtoverifytheexpression.Theresultsshowthatformationfactorexpressionbasedonsinemodelcanaccuratelyreflecttheconductivitycharacteristicsofsandstoneformation.Theformationfactorisrelatedtoporosity,poreshapecorrectionfactor,tortuosityandaspectratio,andtheformationfactorincreaseswiththeincreaseofaspectratioobviouslywhenotherf...
