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A machine learning-based study of multifactor susceptibility and risk control of induced seismicity in unconventional reservoirs

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Petroleum Science 2023年第4期20卷 2232-2243页

作者： Gang Hui Zhang-Xin Chen Hai Wang Zhao-Jie Song Shu-Hua Wang Hong-Liang Zhang Dong-Mei Zhang Fei Gu National Key Laboratory of Petroleum Resources and Engineering China University of PetroleumBeijing102249PR China Department of Chemical and Petroleum Engineering University of CalgaryCalgaryABT2N1N4Canada Eastern Institute for Advanced Study Ningbo315200ZhejiangPR China Computer Modeling Group Ltd.Calgary ABT2L2M1Canada CNOOC Research Institute Beijing100028PR China China University of Geoscience(Wuhan) Wuhan430074HubeiPR China Research Institute of Petroleum Exploration and Development Beijing10083PR China

A comprehensive dataset from 594 fracturing wells throughout the Duvernay Formation near Fox Creek, Alberta, is collected to quantify the influences of geological, geomechanical, and operational features on the distribution and magnitude of hydraulic fracturing-induced seismicity. An integrated machine learning-based investigation is conducted to systematically evaluate multiple factors that contribute to induced seismicity. Feature importance indicates that a distance to fault, a distance to basement, minimum principal stress, cumulative fluid injection, initial formation pressure, and the number of fracturing stages are among significant model predictors. Our seismicity prediction map matches the observed spatial seismicity, and the prediction model successfully guides the fracturing job size of a new well to reduce seismicity risks. This study can apply to mitigating potential seismicity risks in other seismicity-frequent regions.

关键词： Induced seismicity Hydraulic fracturing Seismicity susceptibility risk control Machine learning

A Novel Method for Assessing and Optimizing Software Project Process Based risk control

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Wuhan University Journal of Natural Sciences 2006年第1期11卷 289-293页

作者： JIANG Wei-jin XU Yu-sheng XU Yu-hui Department of Computer Zhuzhou Institute of Technology Zhuzhou 412008 Hunan China College of Mechanical Engineering and Applied Electronics Beijing University of Technology Beijing 100022 China

A new approach for assessing and optimizing software project process based on software risk control presented, which evaluates and optimizes software project process from the view of controlling the software project risks. A model for optimizing software risk control is given, a discrete optimization algorithm based on dynamic programruing is proposed and an example of using above method to solve a problem is also included in this paper. By improving the old passive post-project control into an active effective preaction, this new method can greatly promote the possibility of success of software projects.

关键词： software process project management software risk risk control

A Diffusion Model for Optimal Dividend Payment and risk control for a Firm under Consideration of the Time Value of Ruin

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Wuhan University Journal of Natural Sciences 2010年第5期15卷 369-374页

作者： LIU Wei HU Yijun School of Mathematics and System Science XinjiangUniversity Urumqi 830046 Xinjiang China School of Mathematics and Statistics Wuhan UniversityWuhan 430072 Hubei China

In this paper,we investigate a model for an insurance company with constraint on risk *** objective of the insurer is to find a business policy and a dividend payment scheme so as to maximize the expected discounted value of dividend payment,and the expected present value of an amount which the insurer earns until the time of *** solving the constrained Hamilton-Jacobi-Bellman equation,we obtain the explicit expression for value function and the corresponding optimal strategies.

关键词： diffusion model risk control dividend payment Hamilton-Jacobi-Bellman(HJB) equation optimal policy

risk control of Liquid Chlorine Leak in Wastewater Treatment Plant Based on QRA

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Risk Control of Liquid Chlorine Leak in Wastewater Treatment...

Formation,distribution and risk control of landslides in China

2010(沈阳)国际安全科学与技术学术研讨会

作者： ZHANG Sheng-zhu~1,WU Zong-zhi~2,KANG Rong-xue~2,SANG Hai-quan~2,GU Hai-bo~2,LIU Ning~3 (1.Faculty of Resources and Safety Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China 2.China Academy of Safety Science and Technology,Beijing 100012,China 3.Civil and Environment Engineering School,University of Science and Technology Beijing 100083,China)

＜正＞The bulk storage of liquid chlorine meets the need of disinfection but also poses a considerable risk to the residents *** on the risk analysis of chlorine leak,and through the study of chlorine leak mode,leak source strength and the consequences of accidents,the model of accident consequences of chlorine leak was *** was analyzed by quantitative method and the acceptable standards of individual and social risk were *** quantitative risk calculations are performed in a wastewater treatment plant,and the individual risk contour and social risk curve are *** respect of the high-risk areas,risk control measures are proposed.

关键词： wastewater treatment plant chlorine leak quantitative risk assessment risk control

来源： cnki会议评论

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Journal of Rock Mechanics and Geotechnical Engineering 2011年第2期3卷 97-116页

作者： Runqiu Huang, Weile Li State Key Laboratory of Geohazards Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, 610059, China State Key Laboratory of Geohazards Prevention and Geoenvironment Protection Chengdu University of Technology Chengdu 610059 China

China is a country with a large population as well as frequent landslides. The formation and distribution of landslides in China are determined by its special topography, complex geological environment, active earthquake environment and unusual climate features. This paper analyzes the main features and distribution of 200 catastrophic landslides that occurred in China since 1900. The relationships among the distribution of landslides and topographic conditions, geological structure, climate features and strong earthquake environment are analyzed. The features of landslide-triggering factors and critical conditions in different areas have also been considered. Based on the above-mentioned work, the authors have undertaken the studies of landslide susceptibility assessment. The study is performed according to the topographic and geological features, which are the main triggering factors that affect the landslides. The China’s mainland can be divided into 12 zones, including 4 high susceptibility zones, 7 medium susceptibility zones and 1 low susceptibility zone, according to landslide proneness. Considering the number of life loss and extent of property loss caused by landslides in those 12 zones, the risk evaluation results are listed as follows: 2 extremely high-risk zones, 5 high-risk zones, 2 medium-risk zones and 3 low-risk zones. Taking the number of life loss caused by landslides as the standard of risk level, the paper also analyzes the change in landslide risk level and main risk control measures in China since 1990s. Based on the risk level of landslides in other countries or regions, the acceptable landslide risk level in China has been proposed.

关键词： landslides risk control distribution of landslides in China's Mainland

Deep Foundation Pit Excavations Adjacent to Disconnected Piled Rafts: A Review on risk control Practice

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Open Journal of Civil Engineering 2020年第3期10卷 270-300页

作者： Bantayehu Uba Uge Yuancheng Guo School of Civil Engineering Zhengzhou University Zhengzhou China

Foundation pit excavation engineering is an old subject full of decision making. Yet, it still deserves further research due to the associated high failure cost and the complexity of the geological conditions and/or the surrounding existing infrastructure around it. This article overviews the risk control practice of foundation pit excavation projects in close proximity to existing disconnected piled raft. More focus is given to geotechnical aspects. The review begins with achievements to ensure excavation performance requirements, and follows to discuss the complex soil structure interaction involved among the fundamental components: the retaining wall, mat, piles, cushion, and the soil. After bringing consensus points to practicing engineers and decision makers, it then suggests possible future research directions.

关键词： Deep Foundation Pit Excavation Disconnected Piled Raft Foundation risk control Observational Method

Research on Influencing Factors and Countermeasures of risk control of State-Owned Enterprises under the Background of Big Data

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Proceedings of Business and Economic Studies 2023年第6期6卷 128-133页

作者： Fengyan Wang Ziyu Hou Ronaldo Juanatas Jasmin Niguidula Technical University of the Philippines MaynilaPhilippines

This study explores the risk control and response strategies of state-owned enterprises in the context of big *** economic uncertainty poses new challenges to state-owned enterprises,necessitating innovative risk management *** article proposes response strategies from four key aspects:establishing a proactive risk management culture,building a foundation in technology and data,conducting big data-driven risk analysis,and implementing predictive analysis and real-time ***-owned enterprises can foster a proactive risk management culture by cultivating employee risk awareness,demonstrating leadership,and establishing transparency and open ***,data integration and analysis,leveraging the latest technology,are crucial factors that can help companies better identify risks and opportunities.

关键词： State-owned enterprises risk management Big data risk control

Research on risk control of Medical Insurance Fund

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International English Education Research 2017年第1期 42-44页

作者： YAN Lifang Shanghai University of Engineering Science China

Social health insurance is an important part of the social security system. It is the ＂stabilizer＂ of social and economic development and the ＂buffer＂ of reform. It is of great significance and function to the construction of economic development, social progrcss and harmonious society. However, due to many factors, the operation of the social health insurance fund is facing greater risk. Although the balance is rich, but the general talk about the ＂balance＂, inevitably fall into the ＂too optimistic, ignore the risk＂ of the errors, the current basic medical insurance system, compared with working employees, retirement elderly people do not pay, personal accounts into more, The overall proportion of individual funds to pay lower policy concessions. Although there is a large amount of surplus in the annual health insurance fund, a large part of the balance is due to the relatively young age structure of the insured population and the low consumption of health insurance funds. With the increasing level of the aging of the insured population, the ratio of on-the-job and the backward is gradually reduced, the effect of these preferential policies will continue to enlarge, making the total fund expenditure increased significantly. Therefore, it is an important task to reform the basic medical insurance system in China to strengthen the research on risk control in the medical insurance fund of urban workers, to prevent and control the risks faced by the fund and to ensure the safety of the fund.

关键词： Medical insurance fund risk control

Computer Audit risk control Research

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International English Education Research 2018年第2期 10-12页

作者： CHAI Qin Management School Shanghai University of Engineering Science333 Longteng Road Songjiang District Shanghai CHINA

The development of computer information technology makes the information of the audited unit more and more high. The introduction of accounting computerization information system makes the processing of enterprise economic business more convenient and efficient. Here came the computer controlled environment audit new risks, of course, the computer technology applied to the audit work to improve the audit efficiency by a lot, but also increased the complex information technology environment audit risk. Starting from the concept of computer audit risk, this paper analyzes and discusses the new risks and causes of audit under the computer condition, and puts forward some constructive risk control measures.

关键词： Computer audit risk control The intemal control