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A New Fracability Evaluation Approach for Shale Reservoirs Based on Multivariate Analysis: A Case Study in Zhaotong Shale Gas Demonstration Zone in Sichuan, China

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Acta Geologica Sinica(English Edition) 2019年第4期93卷 1005-1014页

作者： liU Shanyong li lin YUAN Yuan LOU Yishan li zhonghui Institute of Mud Logging Technology and Engineering Yangtze UniversityJingzhou 434023HubeiChina Shandong Provincial Key Laboratory of Depositional Mineralization&Sedimentary Mineral Shandong University of Science and TechnologyQingdao 266590China The Key Laboratory of Well Stability and Fluid&Rock Mechanics in Oil and Gas Reservoir of Shaanxi Province Xi’an Shiyou UniversityXi’an 710065China Research Institute of Petroleum Exploration and Development Petro ChinaZhejiang Oilfield CompanyHangzhou 310023ZhejiangChina College of Technology&Engineering Yangtze UniversityJingzhou 434020HubeiChina School of Petroleum Engineering Yangtze UniversityWuhan 430100HubeiChina

Fracability characterizes the effectiveness of hydraulic *** existing assessment methods cannot reflect the actual value of the effectiveness due to a lack of comprehensive consideration and neglect of the influences of engineering *** study aims to solve this problem by implementing geological static data and production dynamic data in multivariate analysis in Zhaotong shale gas demonstration ***,the reservoir quality index(RQI)was introduced to evaluate the exploration potential by integrating the geological parameters with gray relational ***,the differences in fracturing fluid types and proppant sizes were considered,and the operating parameters were normalized on the basis of the equivalence ***,the general reservoir fracability index(GRFI)was proposed based on a dimensioned processing of the various parameters.A case study was conducted to verify the accuracy and feasibility of this new *** results demonstrate that(1)the organic carbon and gas content are adjusted to contribute the most to the calculation of the RQI,while the effective porosity contributes the least;(2)the fracturing scale is the main operating parameter determining the fracability,which has the strongest correlation with the effectiveness of fracking;and(3)the GRFI has a positive correlation with shale gas production,and the lower limit of the GRFI of 2,000 corresponds to a daily production of 50,000 m3/d;this value is defined as the threshold value of a stripper *** GRFI is consistent with the productivity trend of shale gas wells in the research block,which suggests that the new model is accurate and practical for well candidate selection.

关键词： fracability multivariate analysis equivalence principle network fracturing shale gas

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DESIGN OF LOW-DENSITY PARITY CHECK CODES FOR MIMO SYSTEMS WITH DOUBLY-ITERATIVE RECEIVERS

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Journal of Electronics(China) 2010年第4期27卷 553-556页

作者： Mei zhonghui li Xiaofei College of Telecommunication and Information Engineering Nanjing University of Posts and Telecommunications Nanjing 210003 China

In this paper, the Multiple Input Multiple Output (MIMO) doubly-iterative receiver which consists of the Probabilistic Data Association detector (PDA) and Low-Density Parity-Check Code (LDPC) decoder is developed. The receiver performs two iterative decoding loops. In the outer loop, the soft information is exchanged between the PDA detector and the LDPC decoder. In the inner loop, it is exchanged between variable node and check node decoders inside the LDPC decoder. On the light of the Extrinsic Information Transfer (EXIT) chart technique, an LDPC code degree profile optimization algorithm is developed for the doubly-iterative receiver. Simulation results show the doubly-receiver with optimized irregular LDPC code can have a better performance than the one with the regular one.

关键词： Probabilistic Data Association (PDA) Multiple-Input Multiple-Output (MIMO) Low-Density Parity-Check Code (LDPC) Extrinsic Information Transfer (EXIT) chart

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Energy dissipation of coal and rock during damage and failure process based on EMR

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International Journal of Mining Science and Technology 2015年第5期25卷 787-795页

作者： Song Dazhao Wang Enyuan li zhonghui liu Jie Xu Wenquan School of Safety Engineering China University of Mining & Technology Postdoctoral Research Station Yongcheng Coal & Electricity Holding Group Co.Ltd. State Key Laboratory of Coal Resources & Safe Mining Shaanxi Coal and Chemical Technology Institute Co. Ltd.

The physical and mechanical change processes of coal and rock are closely related to energy transformation,and the destruction and failure of coal and rock is an instability phenomena driven by energy ***,the energy change of large-scale coal rock in the mine site is hardly calculated accurately,making it difficult to monitor coal-rock systematic failure and collapse from the perspective of *** the energy dissipation EMR monitoring system,we studied the damage and failure of coal and rock with bursting liability from the energy dissipation point using the geophysical method-EMR,and explored the energy dissipation characteristics during uniaxial compression and their main influencing *** results show that under displacement-control loading mode,there are 2 types of energy dissipation trends for both coal and rock with bursting *** type Ⅰ trend is a steady increase one during the whole process,therein,the energy dissipation of rock samples is accelerated at the peak *** type Ⅱ trend energy is a W-shaped fluctuating one containing 6 *** load-control loading mode,there is one energy dissipation trend of shock downward-steady *** that,rock samples also present a trend of 4 *** energy dissipation characteristics of coal and rockduring loading failure process can be used as effective criteria to assess whether they are in a stable or destructive *** factors influencing energy dissipation in the loading failure process of coal and rock mainly include strength,homogeneity,and energy input efficiency.

关键词： Energy dissipation Electromagnetic radiation Coal and rock Damage and failure Rock burst

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Photoluminescence investigation on highly p^+ -doped GaAs_(1-y)Sb_y(y<0.3)

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Science China(Technological Sciences) 2012年第11期55卷 3200-3203页

作者： GAO HanChao YIN ZhiJun CHENG Wei li zhonghui XIE Zili School of Electronic Science and Engineering Key Laboratory of Advanced Photonic and Electronic MaterialsNanjing UniversityNanjing 210093China Science and Technology on Monolithic Integrated Circuits and Modules Laboratory Nanjing Electronic Devices InstituteNanjing 210016China

Photoluminescence properties of highly p＋-doped GaASl_ySby are investigated. Band gap narrowing （BGN） effect is considered for heavily doped GaAs1_ySby epilayers. Band-gap Eg（GaAsl_ySby）=l.25y2-1.95y＋1.519 is obtained through fitting band-gap energy obtained by PL spectra from 35 to 300 K. Fermi level （El） and full width at half maximum （FWHM） of photolumines- cence increase with antimony mole fraction. The increase of Fermi level is attributed to hole mass of GaAsl_ySby decrease which is resulted from antimony composition increase. The increase of Fermi level means that more electrons participate in in- direct transition to result in FWHM increases.

关键词： molecular beam epitaxy photoluminescence semiconducting III-V materials

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Study and application of monitoring plane displacement of a similarity model based on time-series images

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Mining Science and Technology 2011年第4期21卷 501-505页

作者： Xu Jiankun Wang Enyuan li zhonghui Wang Chao Srate Key Laboratory of Coal Resources and Mine Safety Xuzhou 221008 China School of Safety Engineering China University of Mining ＆ Technology Xuzhou 221008 China School of Mines China University of Mining ＆ Technology Xuzhou 221008 China

In order to compensate for the deficiency of present methods of monitoring plane displacement in similarity model tests,such as inadequate real-time monitoring and more manual intervention,an effective monitoring method was proposed in this study,and the major steps of the monitoring method include:firstly,time-series images of the similarity model in the test were obtained by a camera,and secondly,measuring points marked as artificial targets were automatically tracked and recognized from time-series ***,the real-time plane displacement field was calculated by the fixed magnification between objects and images under the specific *** then the application device of the method was designed and *** the same time,a sub-pixel location method and a distortion error model were used to improve the measuring *** results indicate that this method may record the entire test,especially the detailed non-uniform deformation and sudden *** with traditional methods this method has a number of advantages,such as greater measurement accuracy and reliability,less manual intervention,higher automation,strong practical properties,much more measurement information and so on.

关键词： Plane displacement monitoring Similarity model test Time-series images Displacement measurement

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Experimental study on the infrared precursor characteristics of gas-bearing coal failure under loading

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International Journal of Mining Science and Technology 2021年第5期31卷 901-912页

作者： Shan Yin zhonghui li Dazhao Song Xueqiu He liming Qiu Quan Lou He Tian School of Civil and Resources Engineering University of Science and Technology BeijingBeijing 100083China School of Safety Engineering China University of Mining and TechnologyXuzhou 221116China School of Municipal and Environmental Engineering Henan University of Urban ConstructionPingdingshan 467036China

The stress and gas pressure in deep coal seams are very high,and instability and failure rapidly and intensely *** is important to study the infrared precursor characteristics of gas-bearing coal instability and *** this paper,a self-developed stress-gas coupling failure infrared experimental system was used to analyse the infrared radiation temperature(IRT)and infrared thermal image precursor characteristics of gas-free coal and gas-bearing *** changes in the areas of the infrared temperature anomalous precursor regions and the effect of the gas on the infrared precursors were *** results show that high-temperature anomalous precursors arise mainly when the gas-free coal fails under loading,whereas the gas-bearing coal has high-temperature and low-temperature anomalous *** area of the high-temperature anomalous precursor is approximately 30%–40%under gasbearing coal unstable failure,which is lower than the 60%–70%of the gas-free *** area of the low-temperature abnormal precursor is approximately 3%–6%,which is higher than the 1%–2%of the gas-free *** increasing gas pressure,the area of the high-temperature anomalous precursor gradually decreases,and the area of the low-temperature anomalous precursor gradually *** highand low-temperature anomalous precursors of gas-bearing coal are mainly caused by gas desorption,volume expansion,and thermal *** presence of gas inhibits the increase in IRT on the coal surface and increases the difficulty of infrared radiation(IR)monitoring and early warning for gas-bearing coal.

关键词： Gas–bearing coal Gas pressure Infrared temperature Infrared thermal image Infrared precursory law

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Predicting microseismic,acoustic emission and electromagnetic radiation data using neural networks

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第2期16卷 616-629页

作者： Yangyang Di Enyuan Wang zhonghui li Xiaofei liu Tao Huang Jiajie Yao School of Materials Engineering Changshu Institute of TechnologySuzhou215506China Key Laboratory of Gas and Fire Control for Coal Mines(China University of Mining and Technology) Ministry of EducationXuzhou221116China School of Safety Engineering China University of Mining and TechnologyXuzhou221116China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and TechnologyXuzhou221116China

Microseism,acoustic emission and electromagnetic radiation(M-A-E)data are usually used for predicting rockburst ***,it is a great challenge to realize the prediction of M-A-E *** this study,with the aid of a deep learning algorithm,a new method for the prediction of M-A-E data is *** this method,an M-A-E data prediction model is built based on a variety of neural networks after analyzing numerous M-A-E data,and then the M-A-E data can be *** predicted results are highly correlated with the real data collected in the *** field verification,the deep learning-based prediction method of M-A-E data provides quantitative prediction data for rockburst monitoring.

关键词： Microseism Acoustic emission Electromagnetic radiation Neural networks Deep learning Rockburst

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DRAGON-Lab―Next generation internet technology experiment platform

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Science in China(Series F) 2008年第11期51卷 1908-1918页

作者： WANG JiLong li zhonghui LV GuoHan JIANG CaiPing li Xing ZHANG Qianli National Laboratory for Information Science and Technology Tsinghua University Beijing 100084 China Network Research-Center Tsinghua University Beijing 100084 China

Testbed technology is very important in the development of the Internet. Similar to the present internet, next generation internet also starts from testbed. There are two kinds of testbeds, testbed networks like CNGI-CERNET2, Internet2, Geant; testbed systems like PlanetLab, NS2. DRAGON-Lab can be viewed as both testbed network and testbed system. DRAGON-Lab is an independent AS （autonomous system） and connected to multiple real networks. On the other hand, DRAGON-Lab integrates many resources of its own, partners＇ and internet＇s, so as to provide open service. DRAGON-Lab has a large scale, provides open service, supports remote visualized experiments and programmable experiments. More details will be introduced in this paper.

关键词： Internet testbed system confederation

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Fractal characteristics of surface crack evolution in the process of gas-containing coal extrusion

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International Journal of Mining Science and Technology 2013年第1期23卷 121-126页

作者： Chen Peng Wang Enyuan Ou Jianchun li zhonghui Wei Mingyao li Xuelong State Key Laboratory of Coal Resources and Mine Safety China University of Mining & Technology School of Safety Engineering China University of Mining & Technology Lawrence Berkeley National Laboratory Berkeley CA 94720 USA

In this paper, simulated experiment device of coal and gas outburst was employed to perform the experiment on gas-containing coal extrusion. In the experiment, coal surface cracks were observed with a high-speed camera and then the images were processed by sketch. Based on the above description, the paper studied the fractal dimension values from different positions of coal surface as well as their changing laws with time. The results show that there is a growing parabola trend of crack dimension value in the process of coal extrusion. Accordingly, we drew the conclusion that extruded coal crack evolution is a process of fractal dimension value increase. On the basis of fractal dimension values taken from different parts of coal masses, a fractal dimension of the contour map was drawn. Thus, it is clear that the contour map involves different crack fractal dimension values from different positions. To be specific, where there are complicated force and violent movement in coal mass, there are higher fractal dimension values, i.e., the further the middle of observation surface is from the exit of coal mass, and the lower the fractal dimension value is. In line with fractal geometry and energy theory of coal and gas outburst, this study presents the relation between fractal dimension and energy in the process of extruding. In conclusion, the evolution of crack fractal dimension value can signify that of energy, which has laid a solid foundation for the quantification research on the mechanism of gas-containing coal extrusion.

关键词： Coal and gas outburst Fracture Surface crack Fractal dimension value Energy

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Regularity and mechanism of coal resistivity response with different conductive characteristics in complete stress-strain process

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International Journal of Mining Science and Technology 2015年第5期25卷 779-786页

作者： Chen Peng Wang Enyuan Chen Xuexi liu Zhentang li zhonghui Shen Rongxi School of Safety Engineering North China Institute of Science & Technology School of Safety Engineering China University of Mining & Technology Key Laboratory of Gas and Fire Control for Coal Mines Ministry of Education

The stress,strain as well as resistivity of coal during uniaxial compression process were tested based on self-built real-time testing system of loaded coal ***,the coal resistivity regularity and mechanism were analyzed at different stages of complete stress-strain process,which includes the two kinds of coal body with typical conductive *** results indicate that coal resistivity with different conductive characteristics has different change rules in complete stress-strain *** is mainly represented at the densification and flexibility phases before dilatation *** variation of resistivity can be divided into two kinds,named down and *** of coal samples occurred between 66%σ_(max) and 87%σ_(max).Because of dilatation,coal resistivity involves sudden *** overall representation is shifting from reducing into improving or from slow improving into accelerated ***,coal resistivity always shows an increasing tendency at the plastic *** peak stress,coal body enters into failure *** expanding and communicating of macro fracture causes further improvement of coal *** maximum value of resistivity rangeability named λ reached *** making real-time monitoring on coal resistivity,variation rules of resistivity can be deemed as precursory information so as to reflect the dilatation and sudden change before coal body reaches buckling failure,which can provide a new technological means for forecasting the dynamic disaster of coal petrography.

关键词： Resistivity Stress-strain Dilatation Conductive characteristics Coal structure

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