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Volume 13 Issue 3
Sep.  2002
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Thermodynamic Modeling of Fluid Bearing Natural Gas Inclusions for Geothermometer and Geobarometer of Overpressured Environments in Qiongdongnan Basin, South China Sea

  • Received Date: 2018-07-15
  • Rev Recd Date: 2018-07-15
  • Publish Date: 2018-07-15
  • Itisaverydifficultproblemtodirectlydeterminefluidpressureduringhydrocarbonmigrationandaccumulationinsedimentarybasins.pVtmodelingofcouplinghydrocarbonfluidinclusionofitscoevalaqueousfluidinclusionprovidesapowerfultoolforestablishingtherelationshipofformationpressureevolutionwithtime.Homogenizationtemperatureoffluidinclusioncanroutinelybemeasuredundermicrothermometricmicroscopy.Crushingtechniquehasbeenemployedtoobtainthecompositionoffluidinclusions,andthecommercialsoftwareVTFLINCeasilyandrapidlycompletestheconstructionofp~tphasediagram.Theminimumtrappingpressureofhydrocarbonfluidinclusionwouldbethendeterminedinthep~tspace.Inthispaper,threesamplesofYC21~1~1andYC21~1~4wellsatYC21~1structuralclosure,Qiongdongnanbasin,SouthChinaSea,wereselectedforthepVtmodelingpractice,andtheformationpressurecoefficient(equalstofluidpressure/hydrostaticpressure)changingtrendwithtimehasprimarilybeenestablished.ThemodelingresultsalsoindicatethatthereservoirsofLingshuiandYachengformationsinYC21~1structurearewithinaveryhighpotentialsystemandwouldhaveundergoneadischargingofthermalfluidsthroughtopsealrupture,whichdepictsthatthereisaveryhighriskfornaturalgasexplorationinthisarea.
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通讯作者: 陈斌, bchen63@163.com
  • 1. 

    沈阳化工大学材料科学与工程学院 沈阳 110142

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Thermodynamic Modeling of Fluid Bearing Natural Gas Inclusions for Geothermometer and Geobarometer of Overpressured Environments in Qiongdongnan Basin, South China Sea

Abstract: Itisaverydifficultproblemtodirectlydeterminefluidpressureduringhydrocarbonmigrationandaccumulationinsedimentarybasins.pVtmodelingofcouplinghydrocarbonfluidinclusionofitscoevalaqueousfluidinclusionprovidesapowerfultoolforestablishingtherelationshipofformationpressureevolutionwithtime.Homogenizationtemperatureoffluidinclusioncanroutinelybemeasuredundermicrothermometricmicroscopy.Crushingtechniquehasbeenemployedtoobtainthecompositionoffluidinclusions,andthecommercialsoftwareVTFLINCeasilyandrapidlycompletestheconstructionofp~tphasediagram.Theminimumtrappingpressureofhydrocarbonfluidinclusionwouldbethendeterminedinthep~tspace.Inthispaper,threesamplesofYC21~1~1andYC21~1~4wellsatYC21~1structuralclosure,Qiongdongnanbasin,SouthChinaSea,wereselectedforthepVtmodelingpractice,andtheformationpressurecoefficient(equalstofluidpressure/hydrostaticpressure)changingtrendwithtimehasprimarilybeenestablished.ThemodelingresultsalsoindicatethatthereservoirsofLingshuiandYachengformationsinYC21~1structurearewithinaveryhighpotentialsystemandwouldhaveundergoneadischargingofthermalfluidsthroughtopsealrupture,whichdepictsthatthereisaveryhighriskfornaturalgasexplorationinthisarea.

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