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2022, 41(1) 153-161 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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Analysis of gas accumulation conditions of Huoshiling Formation in Anda sag of Xujiaweizi fault depression |
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LIUHongyan |
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ExplorationandDevelopmentResearchInstituteofDaqingOilfieldCompanyLtd,Daqing163712,Heilongjiang,Chin |
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Abstract:
TheexplorationdiscoveryofWellDS28showsthattheHuoshilingFormationintheXujiaweizifault depressionhasgoodexplorationprospect.Throughtheanalysisofcoregeochemicaltest,castthinsection,porosity testandotherdata,theauthorsexplorethegassourceconditions,reservoircharacteristics,caprockconditionsand reservoirformingmodeoftheHuoshilingFormationintheAndasag.ThepurposeistodeeplyunderstandthenaturalgasenrichmentlawoftheHuoshilingFormationinthenorthernSongliaoBasinandpointoutthefavorableexplorationareaanddirection.ThestudyshowsthattheHuoshilingFormationintheAndasaghasthebasicgeological conditionsfortheformationofnaturalgasreservoirs.ThesourcerocksoftheHuoshilingandShaheziformations providesufficientgassourcefornaturalgasaccumulation.Asthemainsourcerock,theShaheziFormationhave highorganicmatterabundancesanditwaslateraldockingwiththeHuoshilingFormation,withfavorablehydrocar bonsupplyconditions.VolcanicrocksdistributedintheSNdirectionontheeastandwestsidesofthesagprovide reservoirconditionsfortheformationofgasreservoirs.TheregionaldistributionofthemudstonecaprockoftheDen gloukuFormationprovideseffectivecappingconditions.ThepaleostructureformedduringtheDengloukuperiodin theearlyextensionandlaterinversionisearlierthanthehydrocarbongenerationandexpulsiontimeofsourcerocks,andthematchingofgastrappingandgassupplyisgood.Sourcerocksandlithofaciescontrolthedistributionofgas reservoirs.Thereservoirwitheruptingfacieshasrelativelygoodphysicalpropertiesandisafavorablelithofacies type.Highqualitysourcerockscontrolthedistributionofgasreservoirs.Combinedwithgasreservoirsimulation,it isconsideredthatthelargevolcanicapparatusontheeasternnosestructurebeltarefavorabledirectionsfornatural gasexploration. |
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Keywords:
Andasag
HuoshilingFormation
gasaccumulationconditions
volcanicrock
matchingofgas trappingandgassupply
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Received Revised Online: |
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