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地质学报 2015
SealingFeaturesofFluid-RockSystemanditsControlonAcidicDissolutioninCretaceousSandstoneReservoirs,KuqaSubbasin, PP. 1296-1306 Keywords: Cretaceous,Kuqasubbasin,diagenesis,sealingfeature,dissolution Abstract: TheCretaceousBashijiqikeFormationisthemaingas-bearingstratainthenorthernstructuraldeformationzoneofKuqasubbasin.Theacidicdissolutionofthisformationaroseat5？4Ma,whichcorrespondstothelateburialstageoftheBashijiqikeFormation.Variabilityofinterlayerduetorockcompositionisnegligible.Differentiationofacidicdissolutioninsandstoneswascontrolledbydifferenceinamountofexogenousacidfluidfromunderlyingstrata.Fortheabsenceofsedimentaryandstructuralcarriersystembetweentheisolatedsandstonereservoirs,mostfluid-rocksystemsshowrelativesealingfeatureduringlaterburialstagebysealingfeatureofformationpressure,geochemicalcharacteristicsofformationwaterandcontentofdiageneticproductsinsandstones.Variationofsealingeffectsfordifferentfluid-rocksystemsisobvious.Thepressurecoefficientisinverselyproportionaltoacidicdissolvedporosityofsandstonereservoirs,indicatingthatthevariationofsealingeffectsforfluid-rocksystemmainlycontrolsthedifferentiationofacidicdissolution.
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