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The use of 4D eonverted-wave seismic exploration technology to monitor the safety of CO2 geological storage can fully exploit the characteristic insensitivity to fluids of shear waves to determine individual changes in reservoir pore pressure and fluid saturation. The suitability of 4D convert-ed-wave technology for CO2 geological storage has yet to be assessed; therefore, it is necessary to analyze the feasibility of using 4D converted waves and the factors influencing their use. Based on actual geological data acquired from the Weyburn oilfield, this paper constructs a 4D converted-wave forward model based on well-logging analysis data and numerical simulation data. Using two-layer and wedge-shaped fluid substation models, we analyze the variation in reservoir elastic parameters and fluid parameters with CO2 injection and study the effects of reservoir pore pressure, fluid saturation, and reservoir porosity on 4D converted waves. Using the results, the feasibility of 4D converted waves is studied. The results show that an increase in reservoir thickness is beneficial for 4D converted waves. Changes in reservoir fluid saturation and reservoir porosity affect the results of 4D converted waves, while reservoir pore pressure plays a significant role in changes seen in 4D converted waves. This study lays a good foundation for subsequent interpretations of 4D converted-wave data. [ABSTRACT FROM AUTHOR]

Stereo cameras are the basic tools used to obtain stereoscopic image pairs, which can lead to truly great image quality. However, some inappropriate shooting conditions may cause discomfort while viewing stereo images. It is therefore considerably necessary to establish the perceptual criteria that can be used to evaluate the shooting quality of stereo cameras. This article proposes objective quality evaluation criteria based on the characteristics of parallel and toed-in camera configurations. Considering the different internal structures and basic shooting principles, this paper focuses on short-distance shooting conditions and establishes assessment criteria for both parallel and toed-in camera configurations. Experimental results show that the proposed evaluation criteria can predict the visual perception of stereoscopic images and effectively evaluate stereoscopic image quality. [ABSTRACT FROM AUTHOR]