PL油田浅水辫状河三角洲隔夹层精细表征方法

A Fine Characterization Method of the Interbed in Shallow-water Braided Delta in the PL Oilfield

储层隔夹层精确表征能为油田剩余油分布规律研究和开发调整提供重要依据。从隔夹层表征方法的差异性角度出发,对浅水辫状河三角洲储层隔夹层进行重新分类,并依据层次建模思想对隔夹层进行逐层定量表征。研究认为,PL 油田浅水辫状河三角洲储层隔夹层可划分为层间隔层、砂间夹层、砂内夹层和物性夹层4 种类型,分别对应储层构型研究的6 级至3 级构型界面。应用3 种建模方法分别对4 种隔夹层进行逐层定量表征,即应用基于井孔资料的确定性三维砂描技术表征层间隔层和砂间隔层,应用基于自适应河道方法在单砂体的控制下对砂内夹层进行表征,应用等效表征的方法对物性夹层进行表征。分级定量隔夹层表征方法很好地再现了浅水辫状河三角洲储层结构和隔夹层分布特征,且简单实用。

The fine characterization of the interbed in the reservoir can provide an important basis for exploring the distribution pattern of the residual oil and adjusting the development plan of the oil field. In this study, the interbed in the shallow-water braided delta in the PL Oilfield is re-classified from the perspective of the difference in the characterization method used for the interbed. A layer-by-layer quantitative characterization of the interbed is performed based on the principle of layered modeling. The study suggests that the interbed in the shallow-water braided delta in PL Oilfield can be divided into four types including the spacer interlayer, inter-sand interlayer, sand interlayer, and physical interlayer. These interlayers correspond to the level 6 to level 3 configuration interfaces in the reservoir architecture. Three different modeling methods are used to quantitatively characterize the four different interbeds layer by layer. Specifically, the spacer interlayer and sand interlayer are characterized by a borehole data-based deterministic three-dimensional sand drawing technology, the inter-sand interlayer is characterized using a self-adaptive river-based method with the single sand body controlling during the process, and the physical interlayer is characterized by an equivalent characterization method. The layered quantitative characterization method of the interbed is a simple and practical approach that reflects the reservoir structure and the interbed distribution characteristics in the shallowwater braided delta well.