砂砾岩油藏渗透系数研究

On the Permeability Coefficient of Glutenite Reservoir

为了掌握砂砾岩油藏渗流规律,基于砂砾岩中砾和砂含量及其排列方式不同,开展了理论和实验研究。把砂砾岩孔隙度和渗透率设为砾、砂含量的函数,再基于Kozeny-Carman方程建立渗透率与孔隙度和颗粒粒径的函数关系。研究表明,砂砾岩组成及颗粒排列方式是控制砂砾岩渗透系数的主要因素,砂砾岩渗透率与孔隙度为一种线性关系。水驱油实验进一步表明,束缚水饱和度依赖于砂、砾含量,含水上升快,揭示了砂砾岩油藏特有的渗流特点。

In order to understand the seepage rule of glutenite reservoir, theoretical and experimental investigation was carried out based on the content proportion of sand and pebble-size grain and packing state in rock. Setting the porosity and permeability of sandy conglomerate as a function of sand and pebble-size grain content, then a function related the porosity and permeability with grain size was established based on Kozeny-Carman equation. Results show that the relative proportions of sand and pebble-size grain and packing state are the main factors controlling the permeability coefficient of glutenite reservoir. There is a linear relationship between the permeability and porosity in glutenite reservoir. Results of water drive test further indicate that connate water saturation depends on the relative proportions of sand and pebble-size grain and water cut rises quickly, which display the particular permeability characteristics in glutenite reservoir.