应用Adobe Photoshop定量分析岩石结构

Using Adobe Photoshop to Quantify Rock Textures

岩石薄片定量研究中常用的有肉眼估计、比较图表估计、数点法和图像分析四种定量或半定量分析方法,但Adobe Photoshop比一般的图像分析软件更能迅速、详细和准确地对岩石结构进行定量。其原理是利用Photoshop软件强大的选取功能,对各结构组分进行精细选取,查看选区像素值和总像素值的比值即可得到各自所占百分含量。因此,能定量分析碳酸盐岩中的颗粒、胶结物和孔隙含量,及各种矿物含量和各类孔隙的面积百分含量,继而可定量化分析碳酸盐岩的成岩和孔隙演化历史。其它岩石类型与此类似。川东北PG2井的实例分析表明,Photoshop定量分析法具有很强的实用性和准确性,可广泛应用于各类岩石结构的定量化研究。

Commonly used methods to quantify or semi-quantify rock textures are estimating through naked eyes, or through visual comparison charts, dot-counting, and image analyses. However, using Adobe Photoshop is better than any other methods. Based on its strong ability of selecting, Photoshop can tell the pixels of each interested texture constituents, and the ratios of them to the total pixel of each whole image equal to the area percents of those constituents. Therefore, using Adobe Photoshop, we can get most of the rock texture data so that the diageneses and porosity evolution history could possibly be recovered. An example from Northeastern Sichuan Basin is studied, which proves the applicability and the accuracy of this method.