储层沉积微相带自动跟踪方法

Automatic tracing of reservoir's sedimentary microfacies

薛林福 王剑 王东坡 梅启太 孙权

Xue Linfu Wang Jian Wang Dongpo Mei Qitai Sun Quan

储层沉积微相带自动跟踪是在井间地层划分、对比和沉积微相分析的基础上,利用计算机技术自动确定沉积微相分布、微相带边界和绘制沉积相带图的方法,主要包括井位坐标变换、网格化、插值、叠置、边界搜索及绘制沉积微相带图等步骤。该方法的关键步骤是采用蠕虫插值法和空间插值法,以确定呈带状和片状分布的各种沉积微相,通过网格叠加把这些沉积微相分布结果叠加起来形成最终的沉积微相分布图。蠕虫插值法不同于常规插值法,是根据地质规律模拟人对带状分布的沉积微相分析的一种智能方法。根据这一原理所开发的微相带跟踪系统软件(MFBTS-Micro Facies Belt Tracing System)能够快速分析和跟踪沉积微相及储层的分布。该方法已初步应用到松辽盆地葡萄花油田,由MFBTS软件所产生的结果图与人工绘制的沉积微相带图基本吻合。

Automatic tracing of reservoir's sedimentary microfacies is to predict automatically the distribution and boundaries of sedimentary microfacies and draw facies map by using computer technologies based on interwell stratigraphic classification and correlation and analysis of sedimentary microfacies. It is carried out in 5 steps including coordinate transform of well positions, gridding, interpolation, superposition, search of boundaries and drawing sedimentary microfacies map. The key of this method is to determine the distributions of different sedimentary microfacies by spatial interpolation and "worm" interpolation,and create a map of sedimentary microfacies belts through superposing these microfacies distributions."Worm"interpolation, unlike conventional interpolation methods, is an intelligent method that mimic human to analyze zonal distribution of sedimentary microfacies based on geologic rules. The MFBTS (Micro-Facies Belt Tracing System)software, developed according to the above mentioned principles, provides a tool for analyzing and tracing rapidly the distribution of reservoirs and sedimentary microfacies. Application of this technique in Putaohua oilfield in Songliao Bsasin shows that the map of sedimentary microfacies created by MFBTS is basically consistent with that drawn by hands.

10.11743/ogg20040116