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Reconstruction of different scales of pore-fractures network of coal reservoir and its permeability prediction with Monte Carlo method

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International Journal of Mining Science and Technology 2017年第4期27卷 693-699页

作者： Ni Xiaoming Chen Wenxue Li Zheyuan Gao Xiang School of Energy Science and Engineering School of Civil Engineering Henan Polytechnic University Jiaozuo 454000 China Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region Jiaozuo 454000 China Opening Project of Key Laboratory of Deep Mine Construction Henan Polytechnic University Jiaozuo 454000 China Department of Building Civil & Environmental Engineering Concordia University Montreal H3G1M8 Canada china Coal Tunnel Engineering Go. LTD Xuzhou 221000 China

There are millimeter, micron and nanometer scales of pores and fractures in coal to describe different scales of coal pores and fissures communicating path and to quantitatively characterize their permeability. Such information provides an important basis for studying coalbed methane output mechanism. The pores and fissures in a large number of coal samples were observed and counted by scanning electron microscopy and optical microscopy. The probability distribution models of pore-fissure network were then established. different scales of pore-fissures 2D network models were reconstructed by Monte Carlo method. The 2D seepage models were obtained through assignment zero method and using Matlab software. The effect of permeability on different scale pore-fractures network was obtained by two-dimensional seepage equation. Predicted permeability is compared with the measured ones. The results showed that the dominant order of different scale pore-fractures connected path from high to low is millimeter-sized fractures, seepage pores and micron-size fractures. The contribution of coal reservoir permeability from large to small is millimeter-size fractures, micron-size fractures and seepage pores. different parameters in different scale pore-fractures are of different influence permeability.Reconstruction of different scale pore-fractures network can clearly display the connectivity of porefractures, which can provide a basis for selecting migration path and studying gas flow pattern.

关键词： Fractures network different scales Reconstruction Permeability

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维普期刊数据库

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Response of atmospheric circulation to multiscale SST anomaly associated with Kuroshio Extension decadal variability warming in winter

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Science China Earth Sciences 2021年第12期64卷 2098-2112页

作者： Jianqi ZHANG Chongyin LI Chao ZHANG College of Meteorology and Oceanography National University of Defense TechnologyChangsha410073China LASG Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing100029China

The response of atmospheric circulation to sea surface temperature anomaly(SSTA)of different scales in extratropical oceans has always been a popular issue in air-sea interactions,especially regarding the influence of widely active,small-scale ocean eddies on the atmosphere.Based on the regional climate model RegCM4.6,three sets of ensemble experiments with different initial values were designed,and the response of atmospheric circulation and possible mechanisms to Kuroshio Extension Decadal Variability SSTA with different scales(KEDV-induced SSTA)during winter were discussed.The response of atmospheric circulation to the KEDV-induced mesoscale SSTA presents a broadly tripolar pattern,while the response to the KEDV-induced large-scale SSTA presents a baroclinic structure in the central Pacific and a dipole-type response with a barotropic structure in the eastern Pacific.Further diagnostic analysis shows that under the influence of mesoscale SSTA,transient eddy activity is strengthened,and feedback of transient eddy plays a major role in the large-scale circulation anomaly in the central-eastern Pacific.The associated barotropic energy conversion also plays an important role in maintaining the largescale circulation anomaly in the northwestern Pacific Ocean.Under the influence of large-scale SSTA,diabatic heating is stronger,and the feedback of diabatic heating plays a major role in the large-scale circulation anomaly.

关键词： Ensemble experiments Kuroshio Extension different scales Transient eddy feedback Diabetic heating

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维普期刊数据库

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Application of joint transform correlator in detection of infrared target

Application of joint transform correlator in detection of in...

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2007亚洲光电子会议信息光学与光子学技术分会场

作者： Fanghan Chen Chunjie Li Dongyue Liu Wensheng Wang Changchun University of Science and Technology Changchun 130022 China

Joint transform correlator is one of the most successful optical pattern recognizers which is composed of Ar+ laser, spatial filter, Fourier transform lenses, EALCD （electrically addressed liquid crystal displays） and CCD （Charge Coupled Device）. It has many applications in industry and military. The bottle technologies are how to recognize the target in clutter scene and how to increase the brightness of the correlation peak which represents the detected target. In this paper, we researched joint transform correlator （JTC） for infrared target detection, and used wavelet transform technology to increase the contrast of input image which contains target and reference objects, reduced the high frequency noise and realized target detection in clutter scene. According to our requirement, we selected the two-order spline wavelet, and made input image have discrete binary wavelet transformed. Because edge always contains much information of image, we adopted the method of modular maximum to extract the edge of different scales after wavelet transform mentioned above. In addition, combined with threshold division which could eliminate some of the clutter, we could get the remarkable edge. As experiment result, we detected the infrared image, both with computer correlation matched method and optical JTC method. The experiments show that the wavelet transform technology is one of the best data processing methods for the target detection in clutter background.

关键词： joint transform correlator（JTC） target recognition clutter scene infrared target discrete binary wavelet transform two-order spline wavelet modular maximum edge extract different scales threshold division

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