Terahertz-dependent identification of simulated hole shapes in oil

Terahertz-dependent identification of simulated hole shapes in oil–gas reservoirs

Bao Ri-Ma^{1, 2, †,}, Zhan Hong-Lei^{1, 2, †,}, Miao Xin-Yang², Zhao Kun^{1, 2, 3, ‡,}, Feng Cheng-Jing², Dong Chen², Li Yi-Zhang², Xiao Li-Zhi¹

Three-dimensional scatter plots of the PCA-THz absorbance spectra for the punched Si wafer with (a) triangular and circular holes, (b) circular and square holes, (c) triangular and square holes, and (d) triangular, circular, and square holes. The percentage values indicate the contribution rates of the corresponding PCs.