J4 ›› 2015, Vol. 21 ›› Issue (4): 664-.
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WEI Weihu, ZHU Xiaomin*, TAN Mingxuan, GUO Dianbin, SU Hui, JIANG Feihu
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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
WEI Weihu, ZHU Xiaomin*, TAN Mingxuan, GUO Dianbin, SU Hui, JIANG Feihu. DistributionandOriginAnalysisofAnomalouslyHighPorosity ZonesoftheBayingebiFormationintheCretaceousintheChaganSag[J]. J4, 2015, 21(4): 664-.
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URL: https://geology.nju.edu.cn/EN/
https://geology.nju.edu.cn/EN/Y2015/V21/I4/664