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Jacobian matrix for the inversion of P-and S-wave velocities and its accurate computation method

Science China Earth Sciences 2011年第5期54卷 647-654页

作者： LIU FuPing MENG XianJun WANG YuMei shen guoqiang YANG ChangChun Beijing Institute of Graphic Communication Beijing 102600 China shengli Geophysical Research Institute of China Petrochemical Corporation (SINOPEC) Dongying 257022 China Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China

The optimization inversion method based on derivatives is an important inversion technique in seismic data processing,where the key problem is how to compute the Jacobian *** computation precision of the Jacobian matrix directly influences the success of the optimization inversion ***,all AVO(Amplitude Versus Offset) inversion techniques are based on approximate expressions of Zoeppritz equations to obtain *** a result,the computation precision and application range of these AVO inversions are restricted *** order to improve the computation precision and to extend the application range of AVO inversions,the partial derivative equation(Jacobian matrix equation(JME) for the P-and S-wave velocities inversion) is established with Zoeppritz equations,and the derivatives of each matrix entry with respect to Pand S-wave velocities are *** solving the JME,we obtain the partial derivatives of the seismic wave reflection coefficients(RCs) with respect to P-and S-wave velocities,respectively,which are then used to invert for P-and S-wave *** better understand the behavior of the new method,we plot partial derivatives of the seismic wave reflection coefficients,analyze the characteristics of these curves,and present new understandings for the derivatives acquired from in-depth *** only a linear system of equations is solved in our method,the computation of Jacobian matrix is not only of high precision but also is fast and ***,the theoretical foundation is established so that we can further study inversion problems involving layered structures(including those with large incident angle) and can further improve computational speed and precision.

关键词： Jacobian matrix Zoeppritz equations inversion of velocities derivatives of RCs with respect to P- and S-wave velocities large angle

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Applying accurate gradients of seismic wave reflection coefficients (SWRC) to the inversion of seismic wave velocities

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Science China Earth Sciences 2012年第12期55卷 1953-1960页

作者： LIU FuPing MENG XianJun XIAO JiaQi WANG YuMei shen guoqiang Beijing Institute of Graphic Communication Beijing 102600China shengli Geophysical Research Institute of SINOPEC Dongying 257022China Greatwall Drilling Company ofCNPC Beijing 100101China

Through solving the Zoeppritz's partial derivative equations, we have obtained accurate partial derivatives of reflected coefficients of seismic wave with respect to Pand S-wave *** those partial derivatives, a multi-angle inversion is developed for seismic wave *** examples of different formation models show that if the number of iterations goes over 10, the relative error of inversion results is less than 1%, whether or not there is interference among the reflection *** we only have the reflected seismograms of P-wave, and only invert for velocities of P-wave, the multi-angle inversion is able to obtain a high computation *** we have the reflected seismograms of both P-wave and VS-wave, and simultaneously invert for the velocities of P-wave and VS-wave, the computation precisions of VS-wave velocities improves gradually with the increase of the number of angles, but the computation precision of P-wave velocities becomes *** matter whether the reflected seismic waves from the different reflection interface are coherent or non-coherent, this method is able to achieve a higher computation *** it is based on the accurate solution of the gradient of SWRCs without any additional restriction, the multi-angle inversion method can be applied to seismic inversion of total *** removing the difficulties caused by simplified Zoeppritz formulas that the conventional AVO technology struggles with, the multiangle inversion method extended the application range of AVO technology and improved the computation precision and speed of inversion of seismic wave velocities.

关键词： Zoeppritz’s partial derivative equations inversion of seismic wave velocity grads of seismic wave reflection coefficients (SWRCs) multi-angle inversion

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A new EPICS time-series data archiver using HBase

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Radiation Detection Technology and Methods 2021年第4期5卷 550-557页

作者： Wenwen shen Youxin Chen Hai Zheng Jing Wang guoqiang shen Guirong Huang Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China

Background The control system of China ADS front-end demo linac(CAFe)is a distributed control system based on experimental physics and industrial control system(EPICS).The data generated by the control system are stored and retrieved by Channel ***,with the development of accelerator devices,its scale continues to *** Archiver has been unable to meet the increasing data volume in terms of availability,performance,and storage *** This paper presents a new data archiving system of EPICS control *** archive engine is developed with microservice architecture,and the data storage layer uses the distributed database—*** The archive engine supports a variety of archive modes,and process variable(PV)archive requests and confguration changes can be realized without *** can also realize data retrieval in a variety of *** addition,python scripts and Web UI can be used to implement the management functions of the *** Currently,the archiving system is under commissioning at CAFe *** results show that the new archiving system is convenient to operate and easy to expand and provides a research platform for future data analysis.

关键词： Control system Microservice Archive engine Database

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Effects of Forest Type and Urbanization on Carbon Storage of Urban Forests in Changchun, Northeast China

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Chinese Geographical Science 2015年第2期25卷 147-158页

作者： ZHANG Dan ZHENG Haifeng REN Zhibin ZHAI Chang shen guoqiang MAO Zhixia WANG Peijiang HE Xingyuan Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and Agroecology Chinese Academy of Sciences University of Chinese Academy of Sciences

Rapid urbanization has led to dramatic changes in urban forest structures and functions, and consequently affects carbon(C) storage in cities. In this study, field surveys were combined with high resolution images to investigate the variability of C storage of urban forests in Changchun, Northeast China. The main objectives of this study were to quantify the C storage of urban forests in Changchun City, Northeast China and understand the effects of forest type and urbanization on C storage of urban forests. The results showed that the mean C density and the total C storage of urban forests in Changchun were 4.41 kg/m2 and 4.74 × 108 kg, respectively. There were significant differences in C density among urban forest types. Landscape and relaxation forest(LF) had the highest C density with 5.41 kg/m2, while production and management forest(PF) had the lowest C density with 1.46 kg/m2. These differences demonstrate that urban forest type is an important factor needed to be considered when the C storage is accurately estimated. Further findings revealed significant differences in different gradients of urbanization, and the mean C density decreased from the first ring(6.99 kg/m2) to the fourth ring(2.87 kg/m2). The total C storage increased from the first ring to the third ring. These results indicate that C storage by urban forests will be significantly changed during the process of urbanization. The results can provide insights for decision-makers and urban planners to better understand the effects of forest type and urbanization on C storage of urban forests in Changchun, and make better management plans for urban forests.

关键词： urban forest carbon storage carbon density urbanization gradients climate change

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A Freight Mode Choice Analysis Using a Binary Logit Model and GIS: The Case of Cereal Grains Transportation in the United States

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Journal of Transportation Technologies 2012年第2期2卷 175-188页

作者： guoqiang shen Jiahui Wang Division of Regional and City Planning College of Architecture School of Industrial Engineering College of Engineering The University of Oklahoma Norman USA

Mode choice is important in shipping commodities efficiently. This paper develops a binary logit model and a regression model to study the cereal grains movement by truck and rail in the United States using the publically available Freight Analysis Framework (FAF2.2) database and U.S. highway and networks and TransCAD, a geographic information system with strong transportation modeling capabilities. The binary logit model and the regression model both use the same set of generic variables, including mode split probability, commodity weight, value, network travel time, and fuel cost. The results show that both the binary logit and regression models perform well for cereal grains transportation in the United States, with the binary logit model yielding overall better estimates with respect to the observed truck and rail mode splits. The two models can be used to study other commodities between two modes and may produce better results if more mode specific variables are used.

关键词： Binary Logit Regression Freight Mode Choice Cereal Grains

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Detailed reservoir inversion addressing geological problems in reservoir development

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Applied Geophysics 2007年第1期4卷 58-65页

作者： shen guoqiang Meng Xianjun Xia Jizhuang Zhang Xuefang Li Xia Geophysical Research Institute Shengli Oilfield Ltd SINOPEC Dongying 257100 China

In the Ken 71 development block, fluvial facies of the Neogene Guantao Formation and delta facies of the Paleogene Dongying Formation are the main pay beds. It is a multiple oil and water system which is complicated by faults. Characteristics of the block include a dense well network, thin reservoirs, complicated horizontal relationships, and small velocity difference between reservoir and non-reservoir. Therefore, it is difficult to conduct detailed reservoir description for subsequent development project adjustment. We demonstrate a stochastic seismic inversion which aims at detailed reservoir description. It is a technology which utilizes multiple wells, seismic data, and geological calibration and integrates with 3D structural interpretation results to build a 3D multi-fault detailed and constrained geological model. On this basis, we adopted stochastic seismic inversion to conduct a multi-stratum parameters inversion such as impedance and lithology. As a result, thin interbedded strata in the block were well resolved and the results demonstrated the importance of detailed reservoir inversion for oilfield development.

关键词： Ken 71 block multi-well calibration detailed geological model impedance stochastic seismic inversion

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Fracture detection by using full azimuth P wave attributes

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Applied Geophysics 2007年第3期4卷 238-243页

作者： Qu Shouli Ji Yuxin Wang Xin Wang Xiuling Chen xinrong shen guoqiang Computer Center Shengli Petroleum Administration Bureau SINOPEC Dongying 257100 China

A type of specific fractured hydrocarbon reservoir, a shale fractured reservoir, exists in the shengli oilfield. Due to very small porosity of this type, low sensitivity to the variation of petrochemical property parameters, and strong anisotropy, it is very difficult to explore for them. So far, there is no set of mature methods for recognition of direction, distribution, and density of the fractures by an integrated analysis of geologic, geophysical, well log, drilling data, and etc. This paper presents a new method for acoustic impedance variation with azimuth （IPVA）, based on existing fracture detection methods. Seismic acquisition, processing, and recognition techniques were developed for detecting directional vertical fractures using multi-azimuth P wave data in combination with the seismic and geological features of shale fractures in the Luojia area. The IPVA research is carried out for recognizing the distribution, strike, and density of fractures based on the study of velocity variation with azimuth （VVA） and amplitude variation with azimuth （AVA） for full azimuth P wave data at different CMP positions. Through practical application in the Luojia area, primary results have been obtained which verifies that the IPVA method provides good potential for quantitative detection of parallel, high angle, shale fractures.

关键词： Shale fractures velocity amplitude acoustic impedance P wave full azimuth

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A New Service Based on CDMA Short Message System-Roaming Advertisement

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ZTE Communications 2003年第1期1卷 8-10页

作者： shen guoqiang (ZTE Corporation,shenzhen 518057,China)

Through the comparison of the features of GSM and CDMA short message services,the paper shows that the CDMA short message center has stronger service capability and provides more value- added services.

关键词： CDMA as from ISP ICP it HLR A New Service Based on CDMA Short Message System-Roaming Advertisement on

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2K Cryogenic Vertical Testing Control System

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IMP & HIRFL Annual Report 2019年第1期 285-286页

作者： Zheng Hai Cao Hu Zhang Rongfeng shen guoqiang 不详

As one of the key experiments to detect the functional characteristics of the superconducting cavity,the cryogenic vertical test of the superconducting cavity is particularly *** factors that infuence the acceleration... 详细信息

关键词： cavity acceleration characteristics

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Self-supporting NiFe LDH-MoS_(x) integrated electrode for highly efficient water splitting at the industrial electrolysis conditions

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Chinese Journal of Catalysis 2021年第10期42卷 1732-1741页

作者： Han Zhang guoqiang shen Xinying Liu Bo Ning Chengxiang Shi Lun Pan Key Laboratory for Green Chemical Technology of the Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China Collaborative Innovative Center of Chemical Science and Engineering(Tianjin) Tianjin 300072China

Developing effective and practical electrocatalyst under industrial electrolysis conditions is critical for renewable hydrogen ***,we report the self-supporting NiFe LDH-MoS_(x) integrated electrode for water oxidation under normal alkaline test condition(1 M KOH at 25℃)and simulated industrial electrolysis conditions(5 M KOH at 65℃).Such optimized electrode exhibits excellent oxygen evolution reaction(OER)performance with overpotential of 195 and 290 mV at current density of 100 and 400 mA·cm^(-2) under normal alkaline test ***,only over-potential of 156 and 201 mV were required to achieve the current density of 100 and 400mA·cm^(-2) under simulated industrial electrolysis *** significant degradations were observed after long-term durability tests for both *** using in two-electrode system,the operational voltages of 1.44 and 1.72 V were required to achieve a current density of 10 and 100 mA·cm^(-2) for the overall water splitting test(NiFe LDH-MoS_(x)/INF||20%Pt/C).Additionally,the operational voltage of employing NiFe LDH-MoS_(x)/INF as both cathode and anode merely require 1.52 V at 50mA·cm^(-2) at simulated industrial electrolysis ***,a membrane electrode assembly(MEA)for anion exchange membrane water electrolysis(AEMWEs)using NiFe LDH-MoS_(x)/INF as an anode catalyst exhibited an energy conversion efficiency of 71.8%at current density of 400 mA·cm^(-2)in 1 M KOH at 60℃.Further experimental results reveal that sulfurized substrate not only improved the conductivity of NiFe LDH,but also regulated its electronic configurations and atomic composition,leading to the excellent *** easy-obtained and cost-effective integrated electrodes are expected to meet the large-scale application of industrial water electrolysis.

关键词： Self-supporting integrated electrode NiFe LDH Electronic structure modulation Industrial alkaline water electrolysis Membrane-electrode assembly

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