Abstract:

TheexplorationofmarinecarbonateoilandgashasgreatprospectsintheLowerTriassicFeixianguanFormation,eastof Sichuan basin. It has into entered the stratigraphic-lithologic gas pool exploration stage. Therefore, it is especially important to strengthentheresearchonthereservoircharacteristicanddistributionpredictionforthestudingarea.Basedoncoreobservationand thin section analysis, combined with the SEM, physical property and pore structure analysis, this paper analyses the reservoir developmentcharacteristicandmaincontrolfactorsandpredictsthepotentialreservoirdistributionarea.Themainreservoirrocktypes oftheFeixianguanFormationaredolomitesandooliticlimestones.Theporosityandpermeabilityarelow.Theintragranularand
intergranularboreholearethemainreservoirspace.Thetypeofreservoirisfracture-pore.Thedevelopmentofreservoiriscontrolledby rocktypes,sedimentaryfaciesdistribution,sealevel,anddolomitization.Ooliticbeltisthefavorablereservoirfacies.Therelative regressionofthesea-levelisgoodforformingporesinthereservoir.Theburiedquartz-fine-graineddolomite,ooliticdolomitereservoir arethemostcommondiagenesisoftheFeixianguanFormation,anditisthekeytotheformationofthehighqualityreservoir.Basedon ourdataofreservoircharacteristicsandmaincontrollingfactorsoftheFeixianguanFormation,wehaveforecastedthefavorable reservoirinthestudiedarea.

Key words: easternSichuanbasin;FeixianguanFormation;reservoircharacteristics;maincontrolfactors