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喇嘛甸油田在进入特高含水开发期后,剩余油挖潜难度逐渐增大。喇嘛甸油田北东块二区萨Ⅲ油层属于三次采油的第一套上返调整层系。为了实现精细开发调整,开展了萨Ⅲ油层组的精细地质研究。为了更客观地描述该区块目的层沉积单元的沉积特征,将原来的8个沉积单元合并调整成6个沉积单元。分析了井网加密后萨Ⅲ组砂体变化特征:砂体连续性明显增强,河道边界更加明显;砂体连通率明显增加;砂体水淹程度由上至下逐渐减小。确定了剩余油的5种分布类型,为新井射孔方案的编制提供了必要的依据:①注采井均位于变差部位,造成油层动用较差,剩余油富集;②在网状分流河道中原井网控制不住的砂体,形成剩余油;③采油井不发育,形成有注无采剩余油;④注入井不发育,形成剩余油富集区;⑤由于废弃河道的遮挡形成剩余油。
Lamadian Oilfield entered the ultra-high water-cut development period, the remaining oil tapping the difficulty gradually increased. The second member of the North East Block in Lamadian Oilfield, Block Sa III, belongs to the first set of upper strata adjusted for tertiary recovery. In order to achieve fine development and adjustment, the fine geology study of the S3 oil group has been carried out. In order to describe the sedimentary characteristics of sedimentary units in the target layer more objectively, the original 8 sedimentary units were combined and adjusted into 6 sedimentary units. The change of sand body of Sa Ⅲ Formation after well patterning is analyzed. The continuity of sand body is obviously enhanced, the boundary of river is more obvious, the connectivity of sand body is obviously increased, and the degree of water intrusion is gradually reduced from top to bottom. Five distribution types of remaining oil were determined, which provided the necessary basis for the preparation of perforation plan of new well: (1) Both injection and production wells were located in the worsened area, resulting in poor reservoir utilization and remaining oil enrichment; (2) The remaining wells can not be controlled by the well pattern of the middle and lower reaches of the well; ③ the oil wells are not well developed to form residual oil without any injection; ④ the injection wells are not well developed and the remaining oil-rich areas are formed; .