辫状河道内部建筑结构模式的建立及对剩余油的控制作用

Establishment of internal structures mode of braided channel and its control action of remaining oil

油田进入高含水后期,如何更好地开采剩余油是油田增产的一个重要方面。大庆油田主要以河流—三角洲沉积为主,如何更好的开采因河道内部夹层遮挡形成的剩余油是今后油田发展的一个主要方向。为了准确的寻求剩余油的具体分布位置,以辫状河道内部建筑结构模式的建立为基本出发点,以现代沉积模式和古代沉积露头为指导,结合岩心、测井曲线、密井网等,建立了一套辫状河道内部夹层分布特征的研究方法。通过对夹层厚度、密度和分布位置等参数的求取,建立了河道内部建筑结构模型,从而为寻找因夹层遮挡形成的剩余油位置提供了技术支持,并提出了适合于研究区开采剩余油的方式。

When the oil fields step into the latter high water cut stage, how to better explore the remaining oil is an important aspect of increasing oilfield production. Daqing oilfield is dominated by fluvial-delta facies, therefore, how to better explore the remaining oil formed by the block of channel interlayer is the main direction of oilfield development in the future. In order to find the specific distribution of the remaining oil, based on the establishment of internal structure mode of braided channel, guiding by present depo- sition model and ancient deposition outcrop, and combined with core, logging curve, dense well pattern and so on, a set of research method of braided channel interlayer distribution characteristics was established. Through the evaluation of thickness, density and distribution parameters of interlayer, internal structure mode of the channel was established to provide technical support for seek- ing the remaining oil formed by the block of channel interlayer and put forward the suitable method for exploring the remaining oil in the study area.