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- W3121858767 abstract "Oil and natural gas prospecting requires precise pore characterisation of insulating rock samples, which involves severe charging problems in the state-of-art FIB-SEM tomography, such as overexposure, drift and distortion. For weak cemented samples with very poor conductivity, the conventional ways such as decreasing accelerating voltage or current as well as coating a thin layer of carbon or gold fail to eliminate all the detrimental effect, leading to image distortion in the form of lateral shift and longitudinal stretching. A new nanoprobe-assisted method is explored in FIB-SEM tomography to address this problem and improve image quality. To be specific, a metallic nanoprobe is induced and attached on the sample surface to create an express path for the export of excess electrons near the region of interest, which effectively removes distortion and drift when imaging. Two adjacent areas were characterised and reconstructed into 3D digital models by FIB-SEM tomography with nanoprobe-assisted method applied to one region only. The lateral shift creates zigzag feature for distorted region and the longitudinal stretching of undistorted object can reach 14%. Average pore size of distorted region is larger than that of the undistorted region, however considering the longitudinal stretching, the average pore size of distorted region can be corrected to the same level as the undistorted region. The systematic error caused by distortion for poorly conductive porous rock is hazardous for digital rock physics analysis. Therefore, the nanoprobe-assisted FIB-SEM tomography should be regarded as a one of the optional and feasible procedures in case decreasing accelerating voltage or current as well as coating a thin layer of conductive material does not work. Image distortion caused by charging problems influence quantitative analysis and simulation, which is more serious in FIB-SEM tomography. This study is used to correct image distortion and reconstruct 3D digital model for poorly conductive samples such as porous rock by nanoprobe-assisted method applied in FIB-SEM tomography. A metallic nanoprobe is induced and attached on the sample surface to removes distortion and drift when imaging. By comparing two adjacent areas with nanoprobe-assisted method applied for one region only, the degree of distortion and pore size distributions are analysed and computed. We observe and analyse lateral shift creates zigzag feature for distorted region and the longitudinal stretching of undistorted object. The average pore size of distorted region is higher than undistorted region, which can be corrected considering the longitudinal stretching. Such systematic error caused by distortion for poorly conductive porous rock is hazardous for not only digital rock physics analysis but also research of unconductive materials. Therefore, the nanoprobe-assisted FIB-SEM tomography should be regarded as a one of the optional and feasible procedures in case decreasing accelerating voltage or current as well as coating a thin layer of conductive material does not work. FIGURE S1 The global and local SEM images of a same region (A-C) before and (D-F) after nanoprobe assistance FIGURE S2 3D Digital model from FIB-SEM tomography image dataset of (A) Region III before nanoprobe assistance and (B) Region IV after nanoprobe assistance FIGURE S3 The (A) relative and (B) accumulative pore size distributions of 3D models for Region III (grey), IV (red) and corrected Region III (blue). Inset: the corresponding Gaussian fits of pore size distributions TABLE S1 The volume fractions and surface areas of overall pores together with connected and disconnected pores for Region I and II Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article." @default.
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- W3121858767 date "2021-02-05" @default.
- W3121858767 modified "2023-09-25" @default.
- W3121858767 title "Reconstructing 3D digital model without distortion for poorly conductive porous rock by nanoprobe‐assisted FIB‐SEM tomography" @default.
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- W3121858767 doi "https://doi.org/10.1111/jmi.13001" @default.
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