01-stepping up land acquisition with 428xl-denis mougenot

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1、SteepingupSteepingupLandacquisitionLandacquisitionwith428XLDenisMOUGENOTChiefGeophysicistSercelEquipmentdivisionEquipmentdivisionCGGV-Sinopecseminar,Beijing,November20111ChallengesfordomesticExplorationMaingeophysicalissuesaddressedbySinopecShengLi,NW&Southandcorresppgo

2、ndingtodifferentexpplorationareas(p(plain,,desert&foothills))1SeismicacquisitionwithsinglesensorsandhighdensitypointacquisitionwithDigitalSensorUnits(DSUpointacquisitionwithDigitalSensorUnits(DSU-428)&Nomad428)&Nomad-902Imagingandcharacterizationofcarbonatereservoirs3G

3、eophysicalexplorationinlowS/NareasofthedesertWideAzimuthAcquisition(WAZ)withhighchannelcount428XL4GeophysicalexplorationinthefoothillsintheNorthGeophysicalexplorationinthefoothillsintheNorth-WestofChinaWestofChina5Identificationofhiddentrapsinclasticrocks6Seismicexplor

4、ationchallengesinthecomplexfoothillareainSouthChinadenseracquisitionwith428Unitecablelesssystemdenseracquisitionwith428Unitecablelesssystem7SeismicexplorationchallengesinthelowS/NareasinSouthChina1)PointacquisitionwithDSU&N1)PointacquisitionwithDSU&N-90SingleDSU3vs.ast

5、ringof18geophones(Liaohe)FullrangggeofDigitalSensorUnits•DigitalSensorUnitwithdifferentpackagingforacquisitiononseabed,,pinTZ&Landopenterrainordifficultaccessareas•ForLand,350,000DSUchannelsold(>10%totalchannels)•New428membersintroduced:DSU1&DSUGPSDSUGPSDSU3SADSU1DSU3DS

6、U3BVnewDSU1AQDSUDSU1vs.thegeophoneequivalentDSU1vs.thegeophoneequivalentDigitalSensorUnit(DSU)FieldDigitizingUnit(FDU)Geophone0,375kgMEMS~0,550kg170mW132mWAccelerometerVelocimeterbasedonMEMSbasedoncoil&magnet(MicroElectroMechanicalSystem)1cm,1g3cm,75gDigitaloutputvoltag

7、eAnalogoutput0–800Hz800Hzlinearresponse10-250Hz250Hz-90dBdistortion-62dB+0.25%amplitudecalibration+2.5%stbltablesensitiititivityvariitiationwith°CsiiignififitcantlowerHFinstrumentnoiselowerLFnopick-upnoiseyesDSU&ggpeophonerespponsesAmplitudeAmplitudeResponsetoaCteaccele

8、rationResponsetoaCtevelocityPhasePhaseDSUdetectsthegravityatDC(0Hz)thegravityAmplitudeatDC(0Hz)AmplitudeFromt