川东七里峡—云安厂地区飞仙关组储层特征 及主控因素研究

四川盆地东部下三叠统飞仙关组海相碳酸盐岩油气勘探具有巨大的前景，目前已进入地层-岩性油气藏勘探阶段，因 此加强对该区储层发育特征及分布预测的研究显得尤为重要。本文以精细岩心观察和薄片鉴定为基础，结合扫描电镜、物性 和孔隙结构等资料分析，对该区储层发育特征及主控因素进行分析，预测了该区有利储层分布区域。研究区飞仙关组主要的 储集岩类型是白云岩类，鲕粒灰岩次之；物性总体上呈现低孔、低渗的特征，且主要储集空间为粒内溶孔和晶间溶孔；储层类型 主要是裂缝-孔隙型；储层发育程度受控于岩石类型、沉积相带分布、海平面升降、白云岩化作用等因素影响。其中鲕滩发 育区为有利储集相带、相对海平面下降有利于储层孔隙的形成，埋藏成因的粉晶-细晶白云岩、鲕粒白云岩是飞仙关组储层 中最普遍也最为重要的成岩作用类型，也是优质储层形成的关键。综合飞仙关组储层特征及主控因素分析，预测了有利储 层发育区。
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.