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GenerationofOilandGasTechnicalterms:tectonicforces构造作用力arethoseoriginatingbeneaththesurfacethatalterthesurfaceconfigurationoftheearthasaresultoftectonic(lithospheric)plateanicmaterial有机质ismatterthathascomefromaonce-livingorganismhydrocarbons烃类anorganiccompoundcontainingonlycarbonandhydrogenoverlyingrocks上覆岩层therocksthatcoveringthereservoirpoolsoftar焦油池Iswherethepetroleumeventuallyreachedthesurfaceandbecollectedinseeps油苗placeswhereoilhasreachedshows显示placeswhereoilhasreachedimpermeablelayerofrock不透水岩层thelayerofrockthatcan'tbepassedbyliquids.theoriginalstratigraphichorizonfromwhichpetroleumisderived.adarkfine-grainedlaminatedsedimentaryrockformedbycompressionofsuccessivelayersofclay-richsedimentanycompoundofcarbonandanotherelementoraradicalstratigraphicafoldwithstrataslopingdownwardonbothsidesfromacommoncrest.
thesaltcoreofasaltdomeafractureinthecontinuityofarockformationcausedbyashiftingordislodgingoftheearth'scrust,inwhichadjacentsurfacesaredisplacedrelativetooneanotherandparalleltotheplaneoffracturetrap圈闭adeviceforsealingapassageagainsttheescapeofgases,especiallyaU-shapedorS-shapedbendinadrainpipethatpreventsthereturnflowofsewergasbymeansofawaterbarrierstructuraltraps构造圈闭thetrapsthatholdoilandgasbecausetheearthhasbeenbentanddeformedinsomeway.Stratigraphictraps地层圈闭thetrapswhicharedepositionalinnature.
Thismeanstheyareformedinplace,usuallybyasandstoneendingupenclosedinshale.
Theshalekeepstheoilandgasfromescapingthetrap.marl泥灰岩alooseandcrumblingearthydepositconsistingmainlyofcalciteordolomite;usedasafertilizerforsoilsdeficientinlimefaulttraps断层圈闭thetrapsthatholdoilandgasbecauseafaultfaultgouge断层泥fine-grainedmaterialinthefaultfaultplane断层面Thesurfacealongwhichthebreakorshearofafaultoccurssaltdome盐丘Ananticlinalfoldwithacolumnarsaltplugatitscore
sedimentarybeds沉积层fossilcoralreefs古珊瑚礁areefconsistingofthefossilofcoralconsolidatedintolimestoneporespace孔隙theporesinarockorsoilconsideredcollectivelysandstonereservoirs砂岩储层areservoirlyinginthesandstonelayer.fractures裂隙Acrackorfaultinarock2.PorosityandPermeabilityTechnicalterms:permeability渗透率permeabilityistheabilityoftheformationtoconductfluids.porosity孔隙度isdefinedastheratioofthevoidspaceinarocktothebulkvolumeofthatrockmultipliedby100toexpressinpercent.bulkvolume总体积thetotalvolumeoriginalporosity原生孔隙度theinbornandnaturalporosityoftherockintergranularporosity粒间空隙度theporosityoccurringbetweenthegrainsintercrystallineporosity晶间孔隙度Theporosityoccurringbetweentheribsooliticporosity鲕状孔隙度inducedporosity次生孔隙度Theporosityproducedbyinduction.Thatis,affectedbyexternalcauses.coring取心Theuseofacorebarrel(hollowlengthoftubing)totakesamplesfromtheundergroundformationduringthedrillingoperationcementing胶结Achemicallyprecipitatedsubstancethatbindsparticlesofclasticrocks
totalporosity总孔隙度istheratioofthetotalvoidspaceintherocktothebulkvolumeoftherockeffectiveporosity有效孔隙度istheratiooftheinterconnectedvoidspaceintherocktothebulkvolumeoftherock,eachexpressedinpercent.in-placetesting现场测量anin-sitemeasurementoccurringatthesametimethesampleischeckedsingle-phasefluidsaturation单相流体饱和oneofthephasesreachthesaturationstateintheerstitialwater间隙水Subsurfacewatercontainedinporespacesbetweenthegrainsofrockandsedimentseffectivepermeability有效渗透率isintroducedtodescribethesimultaneousflowofmorethanonefluidfluidphase液体相achemicallyandphysicallyuniformquantityoffluidthatcanbeseparatedfromanonhomogeneousmixtureflownetwork流体网络aflownetworkisadirectedgraphwhereeachedgehasacapacityandeachedgereceivesaflow.Theamountofflowonanedgecannotexceedthecapacityoftheedge.capillaryproperties毛管性质Capillaryproperty,istheabilityofaliquidtoflowagainstgravitywhereliquidspontaneouslyrisesinanarrowspacesuchasathintube,orinporousmaterialssuchaspaperorinsomenon-porousmaterialssuchasliquifiedcarbonfibre.Thiseffectcancauseliquidstoflowagainsttheforceofgravityorthemagneticfieldinduction.Itoccursbecauseofinter-molecularattractiveforcesbetweentheliquidandsolidsurroundingsurfaces.gascap气顶therockporesintheupperzonethathavebeenfilledmainlybygas.aquifer含水层anundergroundbedorlayerofpermeablerock,sediment,orsoilthatyieldswateroilaccumulation石油凝集面anaccumulationofpetroleumlocallyconfinedbysubsurfacegeologicfeatures.Alsoknownasoilreservoirsaturation饱和度aconditioninwhichaquantitynolongerrespondstosomeexternalinfluenceviscosity粘度resistanceofaliquidtosheerforces(andhencetoflow)connatewater原生水waterentrappedintheintersticesofigneousrockswhentherockswereformed.electriclogsurveys电测井方法In1928,theSchlumbergerbrothersinFrancedevelopedtheworkhorseofallformationevaluationtools,theelectriclogandithadbecomeanimportantmethordinmodernpetroleumengineering.
附(原文):GenerationofOilandGasPetroleumisaresultofthedepositionofplantoranimalmatterinareaswhichareslowlysubsiding.Theseareasareusuallyintheseaoralongitsmarginsincoastallagoonsormarshes,occasionallyinlakesorinlandswamps.Sedimentsaredepositedalongwiththeorganicmatterandtherateofdepositionofthesedimentsmustbesufficientlyrapidthatatleastpartoftheorganicmatterispreservedbyburialbeforebeingdestroyedbydecay.Astimegoesonandtheareacontinuestosinkslowly(becauseoftheweightofsedimentsdepositedorbecauseofregionaltectonicforces构造作用力,theorganicmaterial有机质isburieddeeperandhenceisexposedtohighertemperaturesandpressures.Eventuallychemicalchangesresultinthegenerationofpetroleum,acomplex,highlyvariablemixtureofhydrocarbons烃类,includingbothliquidsandgases(partofthegasbeinginsolutionbecauseofthehighpressure).Ultimatelythesubsidencewillstopandmayevenreverse.Asthegreatweightoftheoverlyingrocks上覆岩层andsedimentspusheddownward,thepetroleumwasforcedoutofitsbirthplace.Itbegantomigrate.Seepingthroughcracksandfissures,oozingthroughminuteconnectionsbetweentherockgrains,petroleumbeganajourneyupward.Indeed,someofiteventuallyreachedthesurfacewhereitcollectedinlargepoolsoftar焦油池.Placeswhereoilhasreachedthesurfacearecalled‘seeps’油苗or‘shows’显示.However,somepetroleumdidnotreachthesurface.Instead,itsupwardmigrationwasstoppedbyanimperviousorimpermeablelayerofrock.不透水岩层Itlaytrapped圈闭farbeneaththesurface.Theoilandgastendtoriseandwilleventuallyreachthesurfaceoftheearthandbedissipatedunlesstheyencounterabarrierwhichstopstheupwardmigration.Suchabarrierproducesatrap.TypesofTrapsAtrap(圈闭)istheplacewhereoilandgasarebarredfromfurthermovement.Geologistshaveclassifiedpetroleumtrapsintotwobasictypes:structuraltraps(构造圈闭)andstratigraphictraps(地层圈闭).Structuraltrapsaretrapsthatareformedbecauseofadeformationintherocklayerthatcontainsthehydrocarbons.About80to90percentoftheknownpetroleumreservesoccurinstructuraltraps.Ananticline,thesimplestandcommonestformofpetroleumaccumulation,isanupwardfoldinthelayersofrock,muchlikeanarchinabuilding.Aporousandpermeablereservoirrockmustbesealedabovebyanimpermeablecoverbedwhichisfine-grained(细密的),relativelyimpermeablebedsuchasclay,shale,(页岩)marl(泥灰岩),orsalt.Petroleummigratesintothehighestpartofthefold,anditsescapeispreventedbyanoverlyingbedofimpermeablerock.Faulttraps(断层圈闭)arealsocommon.Again,theremustbeaporousandpermeablereservoirrockthatissealedabovebyafine-grained,relativelyimpermeablebed.Buttherealtrapisprovidedbythefault,whichpreventsfurtherupdipmigration(上升运移)eitherbythefine-grainedmaterialinthefaultitself(theso-called“faultgouge(断层泥)”thatresultsfromthemovementonthefaultplane(断层面))orbythebriningofafine-grainedrelativelyimpermeablebedontheothersideofthefaulttothepositionthattruncatesthereservoir.Asaltdome(盐丘)formedwhenamassofsaltflowsupwardsunderthepressureresultingfromtheweightoftheoverlyingsediments(上覆沉积).Thesaltdomebowsupsedimentarybeds(沉积层)andsealsoffdisruptedbeds(断裂岩层)andsoprovidestrapsoverandaroundthesidesofthedome.Thetrappingmechanism(圈闭机理)ofstratigraphictrapsisfromstratigraphicratherthanstructuralcauses.Inthese,theessentialfeaturesremainaporousandpermeablereservoirrocksealedbyafine-grainedrelativelyimpermeablerock,buttheconfigurationofthesetoformatraparisesfromtheparticularsedimentaryprocessandnatureoftheresultingsediments.Themostobviousformsofstratigraphictraparefossilcoralreefs(古珊瑚礁)suchasthoseofwesternCanadaandLibya.Inthese,thevoidsinthereeforreeflikereservoircontainthepetroleumwhichispreventedfromleakingoutbytheclayorshaleinwhichthereefisenveloped.Thesevoidsarenotliketheporespaces(孔隙)insandstonereservoirs(砂岩储层),butmoresolutioncavities(溶洞)andfractures(裂隙).Productionrates(产油率)tendtobemuchhigherthanfromsandstonereservoirs.Thefrictionalresistance(摩擦阻力)tofluidmovementtendstobemuchless,sothereisbettercommunicationthroughthereservoiranditcanbeproducedwithfewerwells.Perhapsthecommonestformofstratigraphictrapisthewedgingorpinchingoutofasand.Discontinuoussands(不连续沉积的砂岩),suchasthosethatformedpartofanoldriversystem(“shoe-string”sands(鞋带状砂岩))areenvelopedinfine-grainedsedimentandmayformatrap.2.PorosityandPermeabilityApetroleumreservoirconsistsofasuitablyshapedporousstratum(多孔层)ofrockwhichiscappedwithanimperviousrock.Thenatureofthereservoirrockisextremelyimportantastheoilisstoredinthesmallspacesorporeswhichseparatetheindividualrockgrains.Sandstonesandlimestonesaregenerallyporous,andinthemainthesearethemostcommontypesofreservoirrocks.Porousrocksmaysometimesalsocontainfracturesorfissures,whichwilladdtotheoil-storingcapacityofthereservoir.Petroleumcollectsintheporesorcavitiesintermingledwiththeremainingwaterwhichwasburiedwiththesediments.Whenasignificantfractionoftheporesisinterconnectedsothatfluidscanpassthroughtherock,therockispermeable.Permeability(渗透性)permitsthegas,oilandwatertoseparatepartiallybecauseoftheirdifferentdensities.Porosity孔隙度isdefinedastheratioofthevoidspaceinarocktothebulkvolume总体积ofthatrockmultipliedby100toexpressinpercent.Porositymaybeclassifiedaccordingtothemodeoforigins(1)originaland(2)induced.Originalporosity原生孔隙度istypifiedbytheintergranularporosity粒间空隙度ofsandstonesandtheintercrystallineandooliticporosity晶间和鲕状孔隙度ofsomelimestones.Inducedporosity次生孔隙度istypifiedbyfracturedevelopmentasfoundinsomeshalesandlimestonesandbythevugsorsolutioncavitiescommonlyfoundinlimestones.Rockshavingoriginalporosityaremoreuniformintheircharacteristicsthanthoserocksinwhichalargepartoftheporosityisinduced.Fordirectquantitativemeasurementofporosity,reliancemustbeplacedonformationsamples岩样obtainedbycoring取心.Indealingwithreservoirrocks储集层岩石,itisnecessary,becausethecementingmaterials胶结物maysealoffapartoftheporevolume,todefinetotalporosity总孔隙度andeffectiveporosity有效孔隙度.Totalporosityistheratioofthetotalvoidspaceintherocktothebulkvolumeoftherock;effectiveporosityistheratiooftheinterconnectedvoidspaceintherocktothebulkvolumeoftherock,eachexpressedinpercent.Fromthereservoir-engineering油藏工程standpoint,effectiveporosityisthequantitativevalue定量值desired,asthisrepresentsthespacewhichisoccupiedbymobilefluids可流动流体.Forintergranularmaterials晶粒间物质,poorlytomoderatelywellcemented,thetotalporosityisapproximatelyequaltotheeffectiveporosity.Formorehighlycementedmaterials胶结物质,significantdifferenceintotalporosityandeffectiveporosityvaluesmayoccur.Permeabilityistheabilityoftheformationtoconductfluids(formationfluidconductancecapacity).Themeasurementofpermeability,then,isameasureofthefluidconductivity流体传递能力oftheparticularmaterial.Itcanbedeterminedfromsamplesextractedfromtheformationorbyin-placetesting现场测量.Sofarpermeabilityisreferredtorockconditionswhereasingle-phasefluidsaturation单相流体饱和wasconsidered.Inpetroleumreservoirs,however,therocksareusuallysaturatedwithtwoormorefluids,suchasinterstitialwater间隙水,oilandgas.Effectivepermeability有效渗透率isintroducedheretodescribethesimultaneousflowofmorethanonefluid.Inthedefinitionofeffectivepermeabilityeachfluidphase液体相isconsideredtobecompletelyindependentoftheotherfluidsintheflownetwork流体网络.Theeffectivepermeabilityisarelativemeasureoftheconductanceoftheporousmedium空隙介质foronefluidphasewhenthemediumissaturatedwithmorethanonefluid.Thisdefinitionofeffectivepermeabilityimpliesthatthemediumcanhaveadistinctandmeasurableconductancetoeachphasepresentinthemedium.FluidContentofReservoirInareservoirrock,thedistributionoffluidsdependsontheirdensitiesandonthecapillaryproperties毛管性质oftherock.Generallyspeaking,ifareservoirrockcontainsuniform均匀分布的pores,andiftheporesareevenlydistributed均匀分布的,therewillbethreezonesoffluids流体区inthetrap:anupperzone,amiddlezone,andalowerzone.Therockporesintheupperzonehavebeenfilledmainlybygas.Thispartofthetrapisthegascap气顶.Inthemiddlezone,theporeshavebeenfilledmainlybyoilwithgasinsolution.Inthelowerzone,therockporeshavebeenfilledbywater.Althoughthestructuraltrapsinwhichoilaccumulatesexistinvariousforms,theoilusuallyoccursinassociationwithgasandsaltwater.Acertainamountofwateralwaysoccurstogetherwiththeoilinthemiddlezone.Theproportionofwatertooilisusuallyabout10to30percent.Wateralsooccursinthegascap,buttheproportionofwatertogasisfrequentlylowerthantheproportionofwatertooil.However,whilesomeinterstitialwater隙间水isalwayspresentintheoilzone含油带,thelatterisnotalwaysunderlainbyacontinuousbodyofwater.Whereaconsiderablevolumeofwaterdoesunderlietheoilinthesamesedimentarybeditisreferredtoasthe“aquifer含水层”,andbeingunderpressurealso,itcontributestothetotalenergyofthereservoir.Theoilitself,whenunderpressure,containsanappreciablequantityofdissolvedgas.Theactualamountofgaswillbegovernedbythepressureandtemperatureinsidethereservoir,andtheoilissaidtobe“saturated已饱和”ifitcannotdissolveanymoregasundertheseparticularpressureandtemperatureconditions.Ontheotherhand,theoilissaidtobe“undersaturated
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