CAJ | 학술논문

综合运用岩心观察、薄片鉴定、物性分析等技术方法，系统分析了文安斜坡沙三段储层岩石学特征、成岩作用特征及储集特征。研究表明，文安斜坡沙三段储层岩石类型以岩屑长石砂岩为主，杂基含量低，成分成熟度和结构成熟度中等；储集空间以原生孔隙为主，占总孔隙的72.81％，储集物性较差，属中低孔-低渗特低渗储层；储层主要经历了压实作用/早期碳酸盐胶结→长石、岩屑溶解/石英次生加大/高岭石充填→石英溶解/碳酸盐胶结→黄铁矿胶结。在有效储层物性下限计算的基础上，选取孔隙度差值作为参数，系统分析了有效储层控制因素。有效储层的形成主要受沉积微相、粒度、分选、成岩作用以及地层压力控制。水下分流河道和河口坝微相中碎屑颗粒越粗，分选越好，杂基含量越少，有效储层越发育；胶结作用对储层物性的控制较明显，是影响中深层储层物性的主要因素；溶蚀作用主要表现为长石等硅酸盐矿物的溶蚀，平均增孔量3.42％；早期地层超压抑制压实作用，保护孔隙，是有效储层发育的有利因素。
종합운용암심관찰、박편감정、물성분석등기술방법，계통분석료문안사파사삼단저층암석학특정、성암작용특정급저집특정。연구표명，문안사파사삼단저층암석류형이암설장석사암위주，잡기함량저，성분성숙도화결구성숙도중등；저집공간이원생공극위주，점총공극적72.81％，저집물성교차，속중저공-저삼특저삼저층；저층주요경력료압실작용/조기탄산염효결→장석、암설용해/석영차생가대/고령석충전→석영용해/탄산염효결→황철광효결。재유효저층물성하한계산적기출상，선취공극도차치작위삼수，계통분석료유효저층공제인소。유효저층적형성주요수침적미상、립도、분선、성암작용이급지층압력공제。수하분류하도화하구패미상중쇄설과립월조，분선월호，잡기함량월소，유효저층월발육；효결작용대저층물성적공제교명현，시영향중심층저층물성적주요인소；용식작용주요표현위장석등규산염광물적용식，평균증공량3.42％；조기지층초압억제압실작용，보호공극，시유효저층발육적유리인소。
The petrologic features,diagenesis characteristics and reservoir characteristics of the Es3 reservoirs in Wen'an slope were systematically studied by core observation,thin section observation and physical property analysis.It can be seen that the study area mainly developed lithic arkose,which contains a few matrixes and its component maturity and structure maturity are in the middle.The reservoir spaces of the lithic arkose are pri-mary pores,which occupy 72.8 1% of the total pores.The reservoirs possess comparatively bad reservoir char-acteristics,and belong to middle-low porosity,low to ultra-low permeability reservoirs.The reservoirs sequently underwent a series of diagenetic stages as follows:consolidation and early carbonate cementation→feldspars and rock debris dissolution,quartz enlargement,kaolinite fillings→quartz dissolution and carbonate cementation→pyrite cementation.On basis of analyzing the lower limits of effective reservoir properties,this study systemically analyzed the controlling factors of effective reservoirs,which include sedimentary microfacies,particle size,sor-ting,diagenesis and formation pressure.Better reservoirs developed in coarser grains in underwater distributary channels and estuary dams,which have better sorting and fewer matrixes.Cementation has distinct control effect on reservoir characteristics,and is the major controlling factor of characteristics of mid-deep reservoirs.Dissolu-tion is mainly shown as the corrosion of silicate minerals such as feldspars,in which the average increasing of pore volume is 3.42%.The overpressure of early phase restrained compaction,protecting the pores,and became the favorable factor of the development of effective reservoirs.