简介：TheclucidationofconditionsoffVrmationofthelarge-scalemineraldepositsattractsattentionofanumberofresearchersdealingwiththedepositsofvariousgeneticgroupsformedinvariousgcodynamicenvironments’Suchsupcrlargedcpositsarewellknownamongthewidelysprcadgroupofhydrotber-maldepositsassociatcdwiththcstructurcsof

简介：

简介：Therearemanyfactorsaffectingtheinstabilityofthesubmarinehydrate-bearingslope(SHBS),andtheinteractionwithhydrateisverycomplicated.Inthispaper,themechanicalmechanismofthestaticliquefactionandinstabilityofsubmarineslopecausedbythedissociationofnaturalgashydrate(NGH)resultingintherapidincreaseofporepressureofgashydrate-bearingsediments(GHBS)andthedecreaseofeffectivestressareanalyzedbasedonthetimeseriesandtypeofSHBS.Then,takingthetypicalsubmarineslopeinthenorthernSouthChinaSeaasanexample,fourimportantfactorsaffectingthestabilityofSHBSareselected,suchasthedegreeofhydratedissociation,thedepthofhydrateburial,thethicknessofhydrate,andthedepthofseawater.Accordingtotheprincipleoforthogonalmethod,25orthogonaltestschemeswith4factorsand5levelsaredesignedandthesafetyfactorsofsubmarineslopestabilityofeachschemearecalculatedbyusingthestrengthreductionfiniteelementmethod.Bymeansoftheorthogonaldesignrangeanalysisandthevarianceanalysis,sensitivityofinfluentialfactorsonstabilityofSHBSareobtained.Theresultsshowthatthedegreeofhydratedissociationisthemostsensitive,followedbyhydrateburialdepth,thethicknessofhydrateandthedepthofseawater.Finally,theconceptofgashydratecriticalburialdepthisputforwardaccordingtotheinfluencelawofgashydrateburialdepth,andthenumericalsimulationforspecificsubmarineslopeiscarriedout,whichindicatestheexistenceofcriticalburialdepth.

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：有细密纹理的岩石(FGR)是重要来源岩石和目前是前景热点的页岩烃的水库。广泛地分布式的有细密纹理的沉积(FGS)上面在Dongying消沉的Shahejie形成的第四个成员作为一个例子被带在这份报纸学习时空进化和FGS的控制因素。基于井核心的分析，薄节，无机、器官的地球化学指示物，FGR被划分成岩相的7种类型。通过point-line-plane的学习，这研究证明FGS有rhythum，差异和继任的特征。第一个阶段被粘土似的FGS(巨大的claystone)描绘。第二个阶段被碳酸盐FGS描绘(low-TOC把石灰石压成薄片)并且含白云石的FGS(含白云石淤泥的页岩)由违反形成了。第三个阶段被器官富人的碳酸盐FGS描绘(middle/high-TOC把石灰石压成薄片)在分布式骑车。第四个阶段被FGS描绘混合碳酸盐和siliciclastic沉积(石灰质淤泥的页岩)。FGS的许多时空进化被多重因素包括tectonism，气候和湖条件控制。