简介:TheKeyLabofGeophysicalExplorationinNorthwestGeologicalResearchInstituteisasubsidiaryoneoftheKeyLabofGeophysicalExploration,CNPC.TheLabownstheupdatedmodernequipment,thefirstseniorgeophysicalresearchersandsoftwareprogrammers.Itisfocusingonresearch,softwaredevelopment,andapplicationsrelatedtointegratedreservoirinversion,hydrocarbondetection,andimagingtechnologyforcomplexgeology.
简介:ThisstudyfocusesonthebasementstructureoftheParanáBasininSouthAmerica,basedongeologicalandgeophysicaldata.ItisalargeintracratonicbasinformedfromtheLateOrdovicianuntiltheCretaceous,whenasequenceofcontinentalfloodbasaltseruptionscoveredtheentirebasin,precedingthebreak-upofWesternGondwana.Isostaticmodelingwasappliedtolargegravitysurveyscomprisingmorethan12,000gravitystations.TheresidualBougueranomalypattern,representingthecrustalcontributionofthecrystallinebasement,aswellasthesedimentaryandvolcaniclayersofthebasin,revealssimilaritiesbetweenthebasementgravitysignatureandtheexposedrock.ThestresspatternsoftheLateOrdovicianandCretaceoustectoniceventspresentageographicallycoincidentmaximum,andthecorrelationbetweengravityhighsandthemainattenuation(betafactor)suggeststhepresenceofsomepreexistentsuturezones.TheresultantmosaicofgravityblocksandthelocationofmajorfaultsgivesupporttothepresenceofanimportantProterozoiccratonicfeature,herereferredtoasParanapanemablock.
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简介:复杂地球物理的数据的倒置总是解决多参数,非线性、多模式的优化问题。寻找最佳的倒置答案类似于当寻找食物时,在象鸟和蚂蚁那样的群观察的社会行为。在这篇文章,首先,粒子群优化算法详细被描述,并且蚂蚁殖民地算法改善了。然后,方法被用于地球物理的倒置问题的三种不同类型:(1)对噪音敏感的一个线性问题,(2)线性、非线性的问题的同步倒置,并且(3)一个非线性的问题。结果验证他们的可行性和效率。与常规基因算法相比并且退火模仿,他们有更高的集中速度和精确性的优点。与伪相比--牛顿方法和Levenberg-Marquardt方法,他们与克服局部地最佳的答案的能力更好工作。
简介:如果他们一起被联合调查考古学的地点,渗透雷达,电磁的地面传导性,和电的断层摄影术的地面证明了是有效工具。我们在Akhmim考古学的地点进行了地球物理的调查,我们的调查的主要目的是定位另外的为进一步的挖掘的埋葬的结构。地球物理的数据用GEM-300多频率地面传导性剖析程序,SIR2000地面渗透雷达,和SyscalR2抵抗力米系统在区域被获得。综合解释的结果显示出很多个埋葬的特征和一个强壮的线性地区大约1m宽与一面埋葬的墙的怀疑的趋势与一致。看起来是任何一个方面上的猛烈思考的二条平行山脉,显示二面平行的墙扩大了东方西方,一个房间在底部被识别这个地点的左角落。而且,一些的解释结果选择了GPR和邻近的偶极子偶极子抵抗力侧面露天博物馆在能仍然在沙被埋葬的以前发现的塑像右边建议RamsesII的第二尊塑像的存在。
简介:TheCarboniferousandPre-CarboniferousformationsinLudong,Zhungarbasin,containfavorableoil/gasreservoirs.TheCarboniferousformations,however,arecomplexinstructureandexhibitlateralvariationsinlithology.SeismicreflectionsfromPre-Triassicformationsarepoorandthevolcanicreservoirsareverydifficulttoidentify.Theanalysisofphysicalpropertiesconcludedthatthemajortargetsinthisregion,i.e.,thetopoftheJurassicandCarboniferousformations,providedistinctdensityinterfaces.Thebasic,intermediateandacidvolcanicrockswerealsodifferentindensity,resultingindistinguishablegravityanomalies.Thedifferencesinmagnetisminthisregionexistednotonlybetweenthevolcanicrocksandclasticsedimentaryrocksbutalsoamongvolcanicrockswithdifferentcompositions.Allformationsandvolcanicrocksofdifferentlithologiespresentedhighandlowresistanceinterbeds,whicharecharacterizedbyregionaltrends.Themodelingstudydemonstratedthatnon-seismicintegratedgeophysicaltechniquesshouldbefeasibleinthisregion,especiaUythehigh-precisiongravity/magneticmethodscombinedwithlongoffsettransientelectromagneticsounding.
简介:“Seminarforhydrocarbondetectionwithcompositegeophysical/geo-chemicaltechniques”,jointlyorganizedbyChinapetroleumExploration&ProductionCompanyandExplorationGeophysicalCommitteeofCGSandsupportedbytheCompositeGeophysical/geo-chemicalDepartementofOrientalGeophysicalCompanyandChinaExploration&DevelopmentResearchInstiute,
简介:GeologicalresearchontheMediterraneanregionispresentlycharacterizedbythetransitionfromdisciplinarytomultidisciplinaryresearch,aswellasfromnationaltointernationalinvestigations.Inordertosynthesizeandintegratethevastdisciplinaryandnationaldatasetswhichareavailable,itisnecessarytoimplementmaximuminteractionamonggeoscientistsofdifferentbackgrounds.Thecreationofproject-orientedtaskforcesinuniversitiesandotherresearchinstitutions,aswellasthedevelopmentoflargeinternationalcooperationprograms,isinstrumentalinpursuingsuchamultidisciplinaryandsupranationalapproach.TheTRANSMEDAtlas,anofficialpublicationofthe32ndInternationalGeologicalCongress(Florence2004),istheresultofaninternationalscientificcooperationprogramwhichbroughttogetherforovertwoyearssixtythreestructuralgeologists,geophysicists,marinegeologists,petrologists,sedimentologists,stratigraphers,paleogeographers,andpetroleumgeologistscomingfromeighteencountries,andworkingforthepetroleumindustry,academia,andotherinstitutions,bothpublicandprivate.TheTRANSMEDAtlasprovidesanupdated,synthetic,andcoherentportrayaloftheoverallgeological-geophysicalstructureoftheMediterraneandomainandthesurroundingareas.TheinitialstimulusfortheAtlascamefromtherealizationoftheextremelyheterogeneousnatureoftheexistinggeological-geophysicaldataaboutsuchdomain.Thesedatahavebeengatheredbyuniversities,oilcompanies,geologicalsurveysandotherinstitutionsinseveralcountries,oftenusingdifferentproceduresandstandards.Inaddition,muchofthesedataarewritteninlanguagesandpublishedinoutletsthatarenotreadilyaccessibletothegeneralinternationalreader.Bysynthesizingandintegratingawealthofpreexistingandnewdataderivedfromsurficialgeology,seismicsectionsatvariousscales,andmantletomographies,theTRANSMEDAtlasprovidesforthefirsttimeacoherentgeologicaloverv
简介:Thegeophysicalmodelfunction(GMF)describestherelationshipbetweenabackscatteringandaseasurfacewind,andenablesawindvectorretrievalfrombackscatteringmeasurements.ItisclearthattheGMFplaysanimportantroleinanoceanwindvectorretrieval.TheperformanceoftheexistingKu-bandmodelfunctionQSCAT-1isconsideredtobeeffectiveatlowandmoderatewindspeedranges.However,intheconditionsofhigherwindspeeds,theexistingalgorithmsdivergealarmingly.owingtothelackofinsitudatarequiredfordevelopingtheGMFforthehighwindconditions,theQSCAT-1appearstooverestimatethes0,whichresultsinunderestimatingthewindspeeds.Severalmatch-upQuikSCATandspecialsensormicrowave/imager(SSM/I)windspeedmeasurementsofthetyphoonsoccurringinthewestPacificOceanareanalyzed.TheresultsshowthattheSSM/Iwindexhibitsbetteragreementwiththe'besttrack'analysiswindspeedthantheQuikSCATwindretrievedusingQSCAT-1.Onthebasisofthisevaluation,acorrectionoftheQSCAT-1modelfunctionforwindspeedabove16m/sisproposed,whichusesthecollocatedSSM/IandQuikSCATmeasurementsasatrainingset,andaneuralnetworkapproachasamultiplenonlinearregressiontechnologytechnology.InordertovalidatetherevisedGMFforhighwinds,themodifiedGMFwasappliedtotheQuikSCATobservationsofHurricaneIOKE.ThewindestimatedbytheQuikSCATforTyphoonIOKEin2006wasimprovedwiththemaximumwindspeedreaching55m/s.AnerroranalysiswasperformedusingthewindfieldsfromtheHollandmodelasthesurfacetruth.TheresultsshowanimprovedagreementwiththeHollandmodelwindwhencomparedwiththewindestimatedusingtheQSCAT-1.However,largebiasstillexisted,indicatingthattheeffectsofrainmustbeconsideredforfurtherimprovement.
简介:Shallowwaterflow(SWF),adisastrousgeohazardinthecontinentalmargin,hasthreateneddeepwaterdrillingoperations.Underoverpressureconditions,continualflowdeliveringunconsolidatedsandsupwardintheshallowlayerbelowtheseafloormaycauselargeandlong-lastinguncontrolledflows;theseflowsmayleadtocontrolproblemsandcausewelldamageandfoundationfailure.Eruptionsfromover-pressuredsandsmayresultinseafloorcraters,mounds,andcracks.Detailedstudiesof2D/3DseismicdatafromaslopebasinoftheSouthChinaSea(SCS)indicatedthepotentialpresenceofSWF.Itiscommonlycharacterizedbylowerelasticimpedance,ahigherVp/Vsratio,andahigherPoisson'sratiothanthatforthesurroundingsediments.AnalysisofgeologicaldataindicatedtheSWFzoneoriginatedfromadeepwaterchannelsystemwithgasbearingover-pressuredfluidflowandahighsedimentationrate.WeproposedafluidflowmodelforSWFthatclearlyidentifiesitsstressandpressurechanges.TheruptureofpreviousSWFzonescausedthefluidflowthatoccurredintheBaiyunSagofthenorthernSCS.
简介:TheHumisawidespreadphenomenon,reportedinmanypartsoftheworld.Itmanifestsitselfintheformofahum,rumbleandpulsing,oftenfeltasasensationmorethananaudiblesound.Startingin2011,residentsofWindsor,Ontario,Canadastartedreportingintermittentlowfrequencysound,widelyreferredtoastheHum(anddubbedtheWindsorHum).Thisreportoutlinesthedeploymentofashorttermgeophysicalfieldsurvey,performedduring2013inWindsor,Ontario,Canada,aimedatmonitoringtheairwavesignalsassociatedwiththeWindsorHum.Thesummaryofthelowfrequencysoundarraydeploymentispresentedanddiscussed.
简介:Thegeophysicalmodelfunction(GMF)describestherelationshipbetweenbackscatteringandseasurfacewind,sothatwindvectorscanberetrievedfrombackscatteringmeasurement.TheGMFplaysanimportantroleinoceanwindvectorretrievals,itsperformancewilldirectlyinfluencetheaccuracyoftheretrievedwindvector.Neuralnetwork(NN)approachisusedtodevelopaunifiedGMFforC-bandandKu-band(NN-GMF).EmpiricalGMFCMOD4andQSCAT-1areusedtogeneratethesimulatedtrainingdata-set,andGaussiannoiseatasignalnoiseratioof30dBisaddedtothedata-settosimulatethenoiseinthebackscatteringmeasurement.TheNN-GMFemploysradiofrequencyasanadditionalparameter,soitcanbeappliedforbothC-bandandKu-band.Analysesshowthattheσ0predictedbytheNN-GMFiscomparablewiththeσ0predictedbyCMOD4andQSCAT-1.AlsothewindvectorsretrievedfromtheNN-GMFandempiricalGMFCMOD4andQSCAT-1arecomparable,indicatingthattheNN-GMFisaseffectiveastheempiricalGMF,andhastheadvantagesoftheuniversalform.
简介:ThetectonicactivitiesoccurringsincetheCenozoicinthenorthernpartoftheQinghai-TibetPlateau(theregionfromtheEastKunlunMountainstotheTanggulaMountains)wereprobablycausedbytheintenseintraplatedeformationpropagationafterthecollisionbe-tweentheIndianplateandtheEurasianplate.Theirmainexpressionsincludethesubstantialup-liftingoftheplateau,alternationofhorizontalextensionandcompressionundertheverticalgreatestprincipalstressσ1,occurrenceofrift-typevolcanicactivity,formationofthebasin-rangesystem,andsuccessiveeastwardextrusionofblocksresultingfromlarge-scalestrike-slipfaulting.Geophysicalexplorationandexperimentshaverevealedthatthereexistclose-lyalternatinghorizontalhigh-velocityandlow-velocitylayersaswellaslithosphericfaultsofaleft-lateralstrike-slipsenseinthelowerpartofthelithosphere(thelowercrustandlithosphericmantle,60-120kmdeep).Basedonanintegratedstudyofthegeological-geophysicaldataavail-able,theauthorshaveproposedamodelofdeep-seatedmantlediapirandtheassociatedtectonophysicalprocessasthedynamicsourcefortheupliftofthenorthernpartoftheQinghai-TibetPlateau.