CAJ | 학술논문

通过岩心、岩石薄片、扫描电镜等资料,对准噶尔盆地西北缘乌风地区二叠系风城组储层特征及控制因素进行了研究。结果表明：研究区发育的粉砂岩、泥岩和凝灰岩均不同程度地发生了白云石化作用,白云石晶体以细晶和粉晶为主,呈团块状、星点状,顺层或顺微裂隙分布于凝灰质或泥质基质组分中。孔隙类型主要为粒间孔、晶间孔、溶孔和裂缝,其中溶孔和裂缝为主要储集空间。沉积作用、白云石化作用和构造作用共同影响白云质岩类储层物性。沉积环境决定白云质岩类岩石的分布范围;白云石化作用增强岩石脆性;构造活动下发育大量裂缝,其作为储集空间及渗滤通道,使得溶孔在裂缝周边发育。
통과암심、암석박편、소묘전경등자료,대준갈이분지서북연오풍지구이첩계풍성조저층특정급공제인소진행료연구。결과표명：연구구발육적분사암、니암화응회암균불동정도지발생료백운석화작용,백운석정체이세정화분정위주,정단괴상、성점상,순층혹순미렬극분포우응회질혹니질기질조분중。공극류형주요위립간공、정간공、용공화렬봉,기중용공화렬봉위주요저집공간。침적작용、백운석화작용화구조작용공동영향백운질암류저층물성。침적배경결정백운질암류암석적분포범위;백운석화작용증강암석취성;구조활동하발육대량렬봉,기작위저집공간급삼려통도,사득용공재렬봉주변발육。
Based on the investigation of cores,rock slices and scanning electronic microscope,this paper investigated the reservoir properties and controlling factors of the Permian Fengcheng Formation in Wufeng area,northwestern margin of Juggar Basin.The result shows that siltstone,mudstone and tuff developed in the study area were dolomitized in various extents.Dolomite crystal developed mainly fine crystal and powder crystal.The distribution patterns of dolomite crystal in tuffaceous or mud matrix show three different types:lump,satellite and along bedding or fracture.Intergranular pores,intercrystalline pores,dissolved pores and fractures developed mainly in Fengcheng Formation.Both of dissolved pores and fractures are the main reservoir space.Deposition,dolomitization and tectonism affect the reservoir properties together.Depositional setting determines the distribution of dolomitic rocks,dolomitization enhances rock brittle,and large amounts of fractures developed under tectonism as reservoir spaces and percolation channel,which makes dissolved pores developed around.