曙北地区莲花油层储层沉积学及非均质特征研究

通过曙北地区莲花油层储层沉积学研究，将研究区划分出半深湖 深湖亚相、前扇三角洲 浅湖亚相、扇三角洲前缘亚相三种沉积相类型。砂岩体由斜坡边缘向深坳部位分布特征及厚度变化表现出较强的非均质性，导致储层物性亦呈非均质变化，形成粒间孔及胶结物未充满孔、正常粒间孔、溶蚀扩大孔与粒间溶孔、混合孔组合、晶间孔组合、胶结物内溶孔６种组合类型和大孔高渗中喉、大孔中渗细喉、中孔低渗细喉和小孔特低渗微细喉４类孔喉结构模式。储层非均质特征主要受储层沉积条件和成岩改造作用的控制。

SHUBEI AREA LIANHUA OIL LAYER RESERVOIR SEDIMENTOLOGY AND NONHOMOGENEOUS TRAIT STUDY

According to the sedimentological research of Lianhua reservior beds of Shubei region, the study area can be classified into 3 types of sedimentary facy models,namely semideep lakedeeplake subfacies, frontfan deltashallow lake subfacies and fan delta subfacies.The stronger heterogeneality showed by the distribution and the thickness of reservior sandbeds resulted in the heterogenetical changes of physical properties of reservior beds Meanwhile, as a result of this heterogeneality, there are 6 types of aperture assembleges and 4 types of porethroat texture models were formed, respectively, the former includes intergranular porenonefilled aperture assemblege, normal intergranul apertures, erasionenlarged apertureintergranular erosion aperture assemblege,mixed aperture assemblege,intercrystal pore assemblege,and inneragglutinate erosion pore assemblege and the latter consists of large porehighly erosen middle throat, large pore miderosion fine throat, middle pore lowererosion fine throat, small pore ultralow erosion minithroat textures.The heterogenetic features were mainly controlled by the sedimentary conditions and diagenetic reformation of the reservior beds.