综合多建模技术建立厚油层中夹层分布模型

Modeling of interlayer distribution in thick reservoir using integrated simulation technology

油田开发后期,厚油层中夹层是控制剩余油分布的主要地质因素,研究夹层及其分布规律具有重要意义。文中以厚油层中夹层为研究对象,将地质分层劈分凸显夹层,在地质条件的约束下,优选序贯指示随机模拟算法来建立夹层分布模型;综合运用随机性和确定性方法建立沉积微相模型,总结夹层在厚油层、微相中的分布模式。研究结果表明:夹层在空间大多数呈斑状、新月状分布,横向展布范围非常有限,一般不超过1个井距,少数可达2个井距,以随机型分布为主,产状基本呈水平状,少数为低角度状。

At the middle and late stage of oilfield development,the interlayer in thick reservoir is the major geologic factor controlling the remaining oil distribution,so the study of interlayer and its distribution is of great significance. This article focuses on the study of interlayer in thick reservoir and divides the geologic zonation into stressing interlayer. A 3D distribution model for interlayer is developed with the sequential indicator simulation method selected with geological constraint. And then, the sedimentary microfacies model is established with combination of stochastic and certain simulation. Finally, the distribution model of interlayer in thick reservoir is summed up. Study result shows that the most shapes of interlayer in the space are maculosus and crescent. The horizontal distribution range of interlayer is limited, which is not more than one well spacing and a few can reach to two well spacing. The distribution of the interlayer is random which the attitude presents horizontal and the minority of them presents low angle.