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J4 ›› 2015, Vol. 21 ›› Issue (4): 664-.

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DistributionandOriginAnalysisofAnomalouslyHighPorosity ZonesoftheBayingebiFormationintheCretaceousintheChaganSag

WEI Weihu, ZHU Xiaomin*, TAN Mingxuan, GUO Dianbin, SU Hui, JIANG Feihu   

  • Online:2015-12-20 Published:2016-01-04

Abstract:

:Inordertoidentifytheformationanddistributionofhigh-qualityreservoirunderconditionsoftightsandstonereservoirs,the distributionsandoriginsoftheanomalouslyhighporosityzonesoftheBayingebiFormationintheCretaceousintheChaganSagwere studiedbyusingthedataofmeasuredporosity,loggingporosity,thinsections,blueepoxyresin-impregnatedthinsectionsandSEM. Theresultsshowthattherearetwoanomalouslyhighporosityzonesatdepthsof1900-2300mand2500-3100m,respectively,withan averageporosityrangeof7%to5.2%.Thefirstanomalouslyhighporosityzoneismainlydistributedinthemiddle-shallowhorizons, andconsistsoffinesandstoneandconglomeratereservoirsthatweredepositedinthefandeltafrontoftheCentraltectoniczone.The secondoneisdistributedinthedeephorizons,andconsistsoffinesandstonereservoirsinthefandeltafrontofWulijitectoniczoneandEhensubsag.Theoriginofanomalouslyhighporosityzonevariesindifferenttectoniczones.Theoriginofhighporosityzoneisrelated totheleachingofmeteoricwaterinCentraltectoniczone,geothermalfluiddissolutioninWulijitectoniczone,andorganicacid dissolutionintheEhensubsag.

Key words: Anomalouslyhighporosityzone;organicacid;geothermalfluid;tightsandstone;BayingebiFormation;ChaganSag