简介：FollowingtherecommendationoftheInternationalCommissiononStratigraphy(16votesYes[94%],1abstention,2votesnotreceived),theGlobalboundaryStratotypeSectionandPoint(GSSP)forthebaseoftheTuronianStageoftheCretaceousSystemisdefinedasthebaseofbed86oftheBridgeCreekLimestoneMemberoftheGreenhornLimestoneFormationatthewesternendoftheDenverandRioGrandeRailroadcutnearthenorthboundaryofthePuebloReservoirStateParkRecreationArea,westofPueblo,Colorado,USA.ThisGSSPhorizonisalsoexposedandprotectedintheadjacentstaterecreationarea.ItcoincideswiththefirstoccurrenceoftheammoniteWatinocerasdevonense,isinthemiddleofaglobalpositiveexcursioninCarbon-13isotopes,andisbracketedbywidespreadbentonitesthathaveyieldedagesof93to93.5Ma.

简介：“3S”技术在地质找矿中的应用，极大地提高了成矿预测的精度和效益。在新理论、新思路的指导下，通过对已有地质、物探、化探、遥感资料进行二次开发及综合研究分析，应用以遥感技术（“RS”）为主，辅以“G1S”、“GPS”技术和野外现场验证等多源信息手段和方法，进行成矿预测，高效、快速地实现了找矿靶区的预测与定位。

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简介：TheresistivityexperimentalmeasurementsofcoresamplesdrilledfromlowpermeabilityreservoirsofOrdosBasin,NorthwestChina,illustratethatthecementationfactorsarenotagminate,butvaryfrom1.335to1.749.Thisleadstoachallengefortheestimationofwaterandhydrocarbonsaturation.BasedontheanalysisofPurcellequationandassumptionthatrockresistivityisdeterminedbytheparallelconnectionofnumerouscapillaryresistances,atheoreticalexpressionofcementationfactorintermsofporosityandpermeabilityisestablished.Then,cementationfactorcanbecalculatediftheparametersofporosityandpermeabilityaredetermined.Inthefieldapplication,porositycanbeeasilyobtainedbyconventionallogs.However,itisatoughchallengetoestimatepermeabilityduetothestrongheterogeneityoflowpermeabilityreservoirs.Thus,theSchlumbergerDollResearch(SDR)modelderivedfromNMRlogshasbeenproposedtoestimatepermeability.BasedontheanalysisofthetheoreticalexpressionsofcementationfactorandSDRmodel,anovelcementationfactorpredictionmodel,whichisrelevanttoporosityandlogarithmicmeanofNMRT2spectrum(T2lm),isderived.TheadvantageofthismodelisthatalltheinputinformationcanbeacquiredfromNMRlogsaccurately.Inordertoconfirmthecredibilityofthenovelmodel,theresistivityandcorrespondinglaboratoryNMRmeasurementsof27coresamplesareconducted.Thecredibilityofthemodelisconfirmedbycomparingthepredictedcementationfactorswiththecoreanalyzedresults.Theabsoluteerrorsforallcoresamplesarelowerthan0.071.Oncethismodelisextendedtofieldapplication,theaccuracyofwaterandhydrocarbonsaturationestimationwillbesignificantlyimproved.

简介：ObjectiveThenearlyparallelN–S-trendingriftsinsouthernTibetrepresenttheE–WextensionoftheTibetPlateau.MostdatawhichconstrainedtheageoftheextensionaldeformationcomefromisotopicdatingofthedikesprobablyrelatedtotheactivityofthenearlyN–Sfaultingandmicasfromhydrothermalactivityandthelowtemperaturethermochronologyofplateauuplift.Previous

简介：我们把周围的噪音断层摄影术用于在从76个车站的地区性的网络的2008年1月1日和2008年12月31日之间的地震数据由中国地震管理部署了的连续三部件的宽带。周围的噪音跨关联被执行生产每车站对的草地功能。在从6～50s的时期以内，瑞利和爱波浪分散曲线用多重过滤器分析方法被测量。然后三维(3-D)从表面的S波浪速度结构击倒到70km从瑞利和爱波浪分散结果被转换。获得的S波浪速度地图在学习区域与不同地质、构造的特征显示出强壮的侧面的变化和相互关联很好。四川盆由于厚沉积存款，但是高在浅深度显示低速度在中间降低外壳中的速度；东方西藏的高原清楚地在它与外壳的流动模型建议解释机制一致的mid-to-lower外壳中与一个低速度的地区被展示高举并且为西藏的高原的变丑的模式。同时，我们的结果也展出外壳的厚度从东方西藏的高原减少了到四川盆。

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简介：根据北方地区岩溶含水层的特征,基于改进欧洲方法,利用ArcGIS构建了包括指标体系、权重、评分体系的北方地区岩溶含水层脆弱性评价模型.并运用该模型,对北京房山岩溶含水层脆弱性进行了评价.结果表明：岩溶水脆弱性较高的区域位于岩溶发育的地区尤其是溶洞周围,而在范围较小的研究区,降雨及植被覆盖因素的影响较小.模拟结果显示,北京房山岩溶区90%处于脆弱性较低的范围,只有研究区西北部岩溶发育强烈的小部分区域脆弱性较高,建议加强进一步调研或应加强保护.

简介：提出了一种基于差值图像的改进PCA图像融合方法。利用低通滤波分别抽取多光谱和全色图像与相应低分辨率图像的差值图像，再利用主成分分析方法将多光谱图像的差值图像与全色图像的差值图像进行融合，在差值的层次上实现图像融合。

简介：TightzonesofthegasbearingKanganandDalanformationsoftheSouthParsgasfieldcontainaconsiderableamountofunsweptgasduetotheirlowporosity,lowpermeabilityandisolatedporetypes.Thecurrentstudy,integratescoredata,rockelasticpropertiesand3Dseismicattributestodelineatetightandlow-reservoir-qualityzonesoftheSouthParsgasfield.Inthefirststep,thedynamicreservoirgeomechanicalparameterswerecalculatedbasedonempiricalrelationshipsfromwelllogdata.Thelog-derivedelasticmoduliwerevalidatedwiththeavailablelaboratorymeasurementsofcoredata.CrossplotsbetweenestimatedporosityandelasticparametersbasedonYoung'smodulusindicatethatlowporosityzonecoincidewithhighvaluesofYoung'smodule.Theresultswerevalidatedwithpetrographicstudiesoftheavailablethinsections.Thecoresampleswithlowporosityandpermeabilityarecorrelatedwithstrongrockswithtightmatrixframeworksandhighelasticvalues.Subsequently,rockelasticpropertiesincludingYoung'smodulusandPoisson'sratioalongwithporositywereestimatedbyusingneuralnetworksfromacollectionof3Dpost-stackseismicattributes,suchasacousticimpedance(AI),instantaneousphaseofAIandapparentpolarity.Distinguishinglowreservoirqualityareasinpayzoneswithunsweptgasisthenfacilitatedbylocatinglowporosityandhighelasticmodulusvalues.Anhydritezonesareidentifiedandeliminatedasnon-payzonesduetotheircharacterizationofzeroporosityandhighYoungmodulusvalues.Themethodologydescribedhasapplicationsforunconventionalreservoirsmoregenerally,becauseitisabletodistinguishlowporosityandpermeabilityzonesthatarepotentiallyproductivefromthoseunprospectivezoneswithnegligiblereservoirquality.

简介：ThetransitionzonebetweentheEastAsiaandCentralAsiacrustobodlesisnotonlyadiwaregion,butalsoagigantictectono-metallogenicbeltinAsia.IttrendsN-S,liesbetweenlong.100°-107°Eandlat.14°-62°N,hasalengthof4600kmandfurtherextendssouthwardandnorthward.Themainfeaturesofthebeltareasfollows:(1)Thebc1tcon8istsofotc

简介：结合目前北京地区桩锚支护基坑旋喷止水工艺常见的设计方案及实际止水效果，分析了利用桩间旋喷止水工艺止水的利弊。总结了影响桩间旋喷止水工艺效果的主要因素，初步提出了桩间旋喷止水工艺的改进建议。