基于图象处理的岩石组构测定方法

Petrofabric determination based on image process

鉴于传统的岩石组构测量方法比较繁琐,提出了一种基于图象处理的岩石组构测定的新方法。此方法可将图象x y平面内比较难测量的方位角转化到Hough域ρθ坐标下,统计分析各个方位角,判断是否存在优选方位并计算岩组的优选方位角,Hough域的叠加值反映了对颗粒方位角识别的置信度;对于一些细微的、离散的岩石颗粒进行统计分析,给出矿物颗粒偏光性的解决方法。实际资料处理结果表明,相对于传统测量方法,采用基于图象处理的方法对岩石组构进行测定,其抗噪性好,减少了在目测过程中产生的误差,提高了岩组测量效率,能在岩石构造分析中获得更多、更准确的地质信息。

Because the conventional petrofabric determination method is great complexity, a new approach was developed on the basis of image process. Orientation angles which are difficult determined in x-y coordinates were transformed to ρ-θ coordinates by Hough transformation. All the orientation angles are analyzed to determine whether there is the preferred orientation angle or not, and to calculate the preferred orientation angle of the petrofabric. The confidence of orientation angles detecting is decided by the Hough domain stacking value. The problem of mineral practicles polarity was settled by analyzing some fine and discrete practicles by the new method. Results of real data process show that this method has noise resistant. Eye-measurement error is decreased and efficiency of petrofabric determination is improved. More and accurate geology information is obationed by the new method.