地震沉積學(xué)多媒體04a type

Seismic4.SeismicSeismic4.SeismicLithology-impedancerelationshipSeismicinversionSeismicConceptofreservoirTheuseConceptofreservoirTheusegeophysicalmethodstoassistdelineatingordescribingareservoir,ormonitoringthechangeinareservoirasitisproduced.-Sheriff,Delineation:geometry(structure,thickness,extension,Description(characterization):physicalproperties(porosity,permeability,saturation,…)Monitoring:propertychangesduring Hongliu2ConceptofreservoirReservoirConceptofreservoirReservoirTraveltime Hongliu3TheuseTheuseseismicmethodstoassistinordescribingreservoirlithologyanditsdistribution(boundaryandthickness).Typicalseismicmethods:SeismicinversionAVO(amplitudevsoffset)Seismicattributes Hongliu4ReservoirReservoirTraveltime Hongliu5WhatcontributetoaseismicThreeWhatcontributetoaseismicThreeBedspacing(thickness)層間Shapeofwavelet(phase/frequency)子波形反射系數(shù)大小及極 Hongliu6Sandstone/shale(GulfCoastSandstone/shale(GulfCoastHongliu7Properties/RCvs.(GulfCoastProperties/RCvs.(GulfCoastrrol,8Lithology-Whylithology-impedancerelationshipLithology-Whylithology-impedancerelationshipThreetypesofsand-shaleComplexityofcarbonate Hongliu9Whylithology-ImpedanceRelationshipsDeterminelithologicalmeaningWhylithology-ImpedanceRelationshipsDeterminelithologicalmeaningofamplitudeandDeterminefundamentalsofambiguityinlithologicaldetectionandmappingDetermineworkingmodelsofseismiclithology(differentmodelsmaybeneededforthesame3Dseismicdataset)???HongliuThreeTypesof?TypeA:ImpedancedecreaseswitheffectiveThreeTypesof?TypeA:Impedancedecreaseswitheffective?TypeB:Impedanceincreases,andthendecreaseswitheffectiveporosity?TypeC:ImpedanceincreaseswitheffectiveHongliuEffectiveporosityasindicatorofEffectiveporosityasindicatorofC(ShaleZengHongliuThreeTypesofSand-ShaleThreeTypesofSand-ShaleHongliuTypeA&C?SandstoneandTypeA&C?Sandstoneandshaledifferinimpedanceandcanbedetectedwithlessambiguity?SeismicallythinTypeAsandstone(shale)isreflectedastrough(peak)(90-degreephasewavelet)?SeismicallythinTypeCsandstone(shale)isreflectedaspeak(trough)(90-degreephasewavelet)HongliuTypeA(GulfCoastUpperTypeA(GulfCoastUpperTypeA:Reservoir0LowPORHighPORa.Effective0HighTypeA:Reservoir0LowPORHighPORa.Effective0HighAI LowAI-Impedanceb.HongliuTypeA:40HzSynthetic0a.Rickerzero0TypeA:40HzSynthetic0a.Rickerzero0b.Ricker90HongliuTimeTimeTypefield(GulfTypefield(GulfCopyritdHongliuTypeC:Reservoir0LowPORHighPORa.Effective0LowTypeC:Reservoir0LowPORHighPORa.Effective0LowAI HighAI-Impedanceb.HongliuTypeC:40HzSynthetic0a.RickerzeroTypeC:40HzSynthetic0a.Rickerzero0b.Ricker90HongliuTimeTimeelck=negative/shaleClassroomexercise4:estimateClassroomexercise4:estimate－impedancerelationshipwithwireline HongliuTypeB?ImpedanceofacleansandstoneTypeB?Impedanceofacleansandstoneissimilartothatofshale,butlowerthanthatofshalysandstones?SeismicallythinTypeBsandstoneandshalebothgeneratetroughresponse(90-degreephasewavelet),creatingambiguousamplitudepatternsonstratalslices?SeismicallythinTypeBshalysandstoneisusuallyreflectedasa?PolarityreversalisseenbetweencleansandandshalysandinaTypeBsandbodyHongliuTypeBTypeBTypeBTypeBTypeB HongliuTypeB HongliuTypeB:Reservoir0LowPORHighPORMidPORshalya.TypeB:Reservoir0LowPORHighPORMidPORshalya.Effective0LowAILowAI HighAIshaly-Impedanceb.HongliuTypeB:40HzSynthetic0a.RickerzeroTypeB:40HzSynthetic0a.Rickerzero0Blue=positive/shalysandb.Ricker90HongliuTypeBfieldexampleCleanRed=positive/shalysandstoneTypeBfieldexampleCleanRed=positive/shalysandstoneImpedancevariationwith?InGulfCoast,Impedancevariationwith?InGulfCoast,velocity-depthfunctionisdifferentbetweensandstoneandshale?Fromshallowtodeep,impedancerelationshipvariesfromTypeA,toTypeB,andthentoTypeC?FrommiddleMioceneandup,TypeAdominates(goodHongliuImpedancevariationwithdepth:CBAImpedancevariationwithdepth:CBABCHongletkerji,ComplexityofCarbonate?ComplexityofCarbonate??ButporositymayhaveverycomplicatedrelationshiptoHongliuLogVelocityvs.Log(SanAndres,02.4 y=20690.30758-R=2.221.81.61.41.20HongliuLogVelocityvs.Log(SanAndres,02.4 y=20690.30758-R=2.221.81.61.41.20HongliuCarbonatefi