江苏真武油田真12块垛一六油组(E_2S_1~6)辫状河三角洲沉积

以岩心观察及分析资料为基础 ,结合测井、录井和油田动态资料 ,研究了真武油田垛一六油组的沉积相类型、微相组成以及主要沉积微相的特征 ,认为该区垛一六油组为一套湖退背景下形成的辫状河三角洲沉积 ,底部的 C5单元为辫状河三角洲前缘及前辫状河三角洲沉积 ,上部 C1～ C4单元为辫状河三角洲平原沉积 .作为储集层出现的主要是辫状河三角洲平原亚相的心滩、心滩侧缘沉积 ,以及辫状河三角洲前缘亚相的水下分流河道沉积、河口坝沉积 .其次 ,在沉积单元划分、对比的基础上 ,分析了垛一六油组 5个单元沉积微相的平面展布状况及沉积微相在纵向上的演化规律

Braided delta deposition of E2S16 reservoir zones in block Zhen-12, Zhenwu Oilfield

Based on the observation of cores and the analyses of logging data and production performance information, the types of the sedimentary facies, the build-ups of the microfacies and the characteristics of the main microfacies of E_2S~1~6 reservoir zones in block Zhen-12, Zhenwu Oilfield are studied. It is held that E_2S_1~6 reservoir zones in this area are a set of braided delta sedimentation, which deposited under the background of lake recession. The bottom C5 unit is braided delta front and prodelta deposition, and the upper C4—C1 units are braided delta plain deposition. The microfacies presented in the reservoir mainly includes the channel bar and point bar deposition of the braided delta plain subfacies, and the subaqueous distributary channel and channel-mouth bar deposition of the braided delta front subfacies. On the basis of the division of the units, the plane distribution and the vertical evolution law of the microfacies of C5—C1 units are analyzed.