阵列声波测井中的概率成像加权算法

Weighted algorithm of probability tomography in array sonic log

为提高井壁附近的声波层析成像的速度和精度,提出了一种低分辨率图像对高分辨率成像算法的图像加权技术。这种技术首先由成像分辨率低的声波概率成像算法得到每个成像单元的概率大小,然后以此概率作为ART算法中射线矩阵的加权系数,并在迭代过程中根据每个单元的概率大小和射线长度分配投影误差。与传统的ART算法,以及其它文献中算法的算例结果的对比表明,这种改进技术能够有效地提高计算的精度和图像重建的质量。

To improve the accuracy of acoustic tomography around the borehole wall,image weighting techniques by a low-resolution image for the high-resolution imaging algorithm was developed.A low-resolution image of probability distribution of each unit computed through acoustic probability approach,acts as weighting coefficient of ray matrix in ART algorithm.The error of detected data was distributed depend on the probability and ray length of each unit.The comparison of simulation results with the traditional ART algorithm,and other algorithm in the literature show that improved technology can effectively improve the precision and quality of image reconstruction.