Digital rock physics(DRP)is a paramount technology to improve the economic benefits of oil and gas fields,devise more scientific oil and gas field development plans,and create digital oil and gas fields.Currently,a si...Digital rock physics(DRP)is a paramount technology to improve the economic benefits of oil and gas fields,devise more scientific oil and gas field development plans,and create digital oil and gas fields.Currently,a significant gap is present between DRP theory and practical applications.Conventional digital-core construction focuses only on simple cores,and the recognition and segmentation effect of fractures and pores of complex cores is poor.The identification of rock minerals is inaccurate,which leads to the difference between the digital and actual cores.To promote the application of DRP in developing oil and gas fields,based on the high-precision X-ray computed tomography scanning technology,the U-Net deep learning model of the full convolution neural network is used to segment the pores,fractures,and matrix from the complex rock core with natural fractures innovatively.Simultaneously,the distribution of rock minerals is divided,and the distribution of rock conditions is corrected by X-ray diffraction.A pore—fracture network model is established based on the equivalent radius,which lays the foundation for fluid seepage simulation.Finally,the accuracy of the established a digital core is verified by the porosity measured via nuclear magnetic resonance technology,which is of great significance to the development and application of DRP in oil and gas fields.展开更多
The visual automatic detection method based on artificial intelligence has attracted more and more attention. In order to improve the performance of weld nondestructive defect detection,we propose DRepDet(Dilated RepP...The visual automatic detection method based on artificial intelligence has attracted more and more attention. In order to improve the performance of weld nondestructive defect detection,we propose DRepDet(Dilated RepPoints Detector). First, we analyze the weld defect dataset in detail and summarize the distribution characteristics of weld defect data, that is, the defect scale is very different and the aspect ratio distribution range is large. Second, according to the distribution characteristics of defect data, we design DResBlock module, and introduce dilated convolution with different dilated rates in the process of feature extraction to expand the receptive field and improve the detection performance of large-scale defects. Based on DResBlock and anchor-free detection framework RepPoints, we design DRepDet. Extensive experiments show that our proposed detector can detect 7 types of defects. When using combined dilated rate convolution network in detection, the AP50 and Recall50 of big defects are improved by 3.1% and 3.3% respectively, while the performance of small defects is not affected, almost the same or slightly improved. The final performance of the whole network is improved a large margin,with 6% AP50 and 4.2% Recall50 compared with Cascade RCNN and 1.4% AP50 and 2.9% Recall50 compared with RepPoints.展开更多
Polarization imaging provides significant advantages in underwater environments.However,existing polarization underwater imaging methods primarily focus on leveraging polarization information to suppress the scatterin...Polarization imaging provides significant advantages in underwater environments.However,existing polarization underwater imaging methods primarily focus on leveraging polarization information to suppress the scattering effect to achieve the clear vision,while neglecting other valuable information contained in polarization images,such as the scene depth and the polarization characteristics of the objects.This paper proposes a self-supervised three-dimensional underwater imaging method based on a polarization binocular imager.In addition to improving image quality in turbid water based on polarization imaging,the proposed method merges features from both the enhanced binocular images recovered from polarization information and the feature-rich degree of polarization images into the self-supervised framework to estimate disparities of the scene,achieving high-quality reconstruction of underwater scene depth.We then design multiple self-supervised losses that effectively integrate depth information obtained from both binocular imaging and polarization imaging to guide the learning process.Meanwhile,the proposed method can recover the polarization information of the objects in turbid water,thus enhancing the perception of target properties such as the materials of the objects.Both the simulated experiment and the real-world experiments in the sea demonstrate the effectiveness and superiority of the proposed method.展开更多
基金Science and Technology Cooperation Project of the CNPC-SWPU Innovation Alliance(No.2020CX010501)National Science and Technology Major ProjectNational Natural Science Foundation of China Petrochemical Joint Fund Project(U1762107)
文摘Digital rock physics(DRP)is a paramount technology to improve the economic benefits of oil and gas fields,devise more scientific oil and gas field development plans,and create digital oil and gas fields.Currently,a significant gap is present between DRP theory and practical applications.Conventional digital-core construction focuses only on simple cores,and the recognition and segmentation effect of fractures and pores of complex cores is poor.The identification of rock minerals is inaccurate,which leads to the difference between the digital and actual cores.To promote the application of DRP in developing oil and gas fields,based on the high-precision X-ray computed tomography scanning technology,the U-Net deep learning model of the full convolution neural network is used to segment the pores,fractures,and matrix from the complex rock core with natural fractures innovatively.Simultaneously,the distribution of rock minerals is divided,and the distribution of rock conditions is corrected by X-ray diffraction.A pore—fracture network model is established based on the equivalent radius,which lays the foundation for fluid seepage simulation.Finally,the accuracy of the established a digital core is verified by the porosity measured via nuclear magnetic resonance technology,which is of great significance to the development and application of DRP in oil and gas fields.
文摘The visual automatic detection method based on artificial intelligence has attracted more and more attention. In order to improve the performance of weld nondestructive defect detection,we propose DRepDet(Dilated RepPoints Detector). First, we analyze the weld defect dataset in detail and summarize the distribution characteristics of weld defect data, that is, the defect scale is very different and the aspect ratio distribution range is large. Second, according to the distribution characteristics of defect data, we design DResBlock module, and introduce dilated convolution with different dilated rates in the process of feature extraction to expand the receptive field and improve the detection performance of large-scale defects. Based on DResBlock and anchor-free detection framework RepPoints, we design DRepDet. Extensive experiments show that our proposed detector can detect 7 types of defects. When using combined dilated rate convolution network in detection, the AP50 and Recall50 of big defects are improved by 3.1% and 3.3% respectively, while the performance of small defects is not affected, almost the same or slightly improved. The final performance of the whole network is improved a large margin,with 6% AP50 and 4.2% Recall50 compared with Cascade RCNN and 1.4% AP50 and 2.9% Recall50 compared with RepPoints.
基金National Key Research and Development Program of China(2023YFC3108500)National Natural Science Foundation of China(62475190)+1 种基金Tianjin Municipal Science and Technology Bureau(23YFZCSN00230)Special Project for Enterprise Research and Development in Tiankai Higher Education Innovation Park(23YFZXYC00012).
文摘Polarization imaging provides significant advantages in underwater environments.However,existing polarization underwater imaging methods primarily focus on leveraging polarization information to suppress the scattering effect to achieve the clear vision,while neglecting other valuable information contained in polarization images,such as the scene depth and the polarization characteristics of the objects.This paper proposes a self-supervised three-dimensional underwater imaging method based on a polarization binocular imager.In addition to improving image quality in turbid water based on polarization imaging,the proposed method merges features from both the enhanced binocular images recovered from polarization information and the feature-rich degree of polarization images into the self-supervised framework to estimate disparities of the scene,achieving high-quality reconstruction of underwater scene depth.We then design multiple self-supervised losses that effectively integrate depth information obtained from both binocular imaging and polarization imaging to guide the learning process.Meanwhile,the proposed method can recover the polarization information of the objects in turbid water,thus enhancing the perception of target properties such as the materials of the objects.Both the simulated experiment and the real-world experiments in the sea demonstrate the effectiveness and superiority of the proposed method.
