基于砂岩数字岩心的地层参数模拟与粗化方法研究

基于micro-CT成像的数字岩心技术的发展,拓展了岩石物性参数的测量和分析方法。基于三维数字岩心的物性参数模拟,可较为准确的反应岩石的物性,针对砂岩三维数字岩心图像的地层参数模拟与粗化,对研究岩心的流体分布等具有十分重要的意义。首先,基于三维数字岩心图像,采用闵可夫斯基泛函和K-means聚类法对岩心进行精细分层；其次,采用驱替模拟法,模拟岩心在不同驱替状态下湿相和非湿相的分布,针对不同的湿相分布状态,对各个小层在不同方向上的地层参数进行模拟；最后,采用数学平均法、曲线回归法和去除薄层后的曲线回归法对岩心的地层参数进行粗化并对比分析各种粗化方式结果的差异。

Research of Conductivity Simulation and Upscaling based on 3D Sandstone Core Sample

The development of digital core analysis technology based on micro-CT facility has provided a new approach in measuring and analyzing rock sample properties. Rock properties can be analyzed both in efficiency and accuracy by simulation based on the 3D digital rock core sample. Formation factor simulation and upscaling work which performed on 3D digital sandstone core images has a positive effect on exploring the distribution of fluid etc. Firstly, elaborate rock typing is performed based on the 3D core images with minkowski functionals and k-means cluster algorithm to get the layer system. Capillary drainage transform is used to simulated distribution of wet and non-wet phase under different drainage pressure and formation factor is simulated of every layers both in horizontal and vertical directions. Lastly, three ways is operated to upscale the values with simplified mathematical average method, curve fitting analysis within and without thin layers.