The stability of submarine geological structures has a crucial influence on the construction of offshore engineering projects and the exploitation of seabed resources. Marine geologists should possess a detailed under...The stability of submarine geological structures has a crucial influence on the construction of offshore engineering projects and the exploitation of seabed resources. Marine geologists should possess a detailed understanding of common submarine geological hazards. Current marine seismic exploration methods are based on the most effective detection technologies. Therefore, current research focuses on improving the resolution and precision of shallow stratum structure detection methods. In this article, the feasibility of shallow seismic structure imaging is assessed by building a complex model, and differences between the seismic interferometry imaging method and the traditional imaging method are discussed. The imaging effect of the model is better for shallow layers than for deep layers because coherent noise produced by this method can result in an unsatisfactory imaging effect for deep layers. The seismic interference method has certain advantages for geological structural imaging of shallow submarine strata, which indicates continuous horizontal events, a high resolution, a clear fault, and an obvious structure boundary. The effects of the actual data applied to the Shenhu area can fully illustrate the advantages of the method. Thus, this method has the potential to provide new insights for shallow submarine strata imaging in the area.展开更多
In shallow burial mining areas, abnormal CO emission and the spontaneous combustion of coal are great threats to safety production at a fully-mechanised working face. In order to prevent the CO concentration in the ai...In shallow burial mining areas, abnormal CO emission and the spontaneous combustion of coal are great threats to safety production at a fully-mechanised working face. In order to prevent the CO concentration in the air return corner from exceeding the critical limit, the paper studied the CO emission regularity and characteristics through theoretical analysis, experimental research and field observation. The results show that the main sources of CO emission were the spontaneous combustion of coal in the goaf and the exhaust emissions coming from underground motorised vehicles. The effect factors of CO emission were also investigated, such as seasonal climate changes, the advancing distance and advancing speed of the working face, the number of underground motorised vehicles and some other factors. In addition to these basic analyses, the influence mechanism of each influence factor was also summarised theoretically. Finally, this study researched the distribution and change law of CO concentration in the fully-mechanised working face in two aspects: controlling the change of monitoring points and time respectively. The research results provide a theoretical basis for preventing the CO concentration from exceeding the critical limit in the air return corner and reducing the possibility of spontaneous combustion of coal. Additionally, the results also provide important theoretical and practical guidelines for protecting miners' health in modern mines featuring high production and high efficiency all over the world.展开更多
The article considers peculiarities of underwater monitoring of moving objects in the shallow water areas, particularly seaports. These areas are characterized by a multitude of factors influencing the efficiency of d...The article considers peculiarities of underwater monitoring of moving objects in the shallow water areas, particularly seaports. These areas are characterized by a multitude of factors influencing the efficiency of detection. Nonstationarity conditions of sound propagation and specific interference caused by shipping are the major factors. The various algorithms for the space-time signal processing have been tested and some experimental results are presented. It has been shown that the use of clipped mode in conjunction with the correlation processing of wideband signals and subsequent speckle tracking allow realizing high efficiency of monitoring.展开更多
Chinas offshore areas abound in oil & gas resources, but both the intensity of prospecting and the produced outputs are low, as a result, there exists a lot of development potential. Our pursuit to develop offsh...Chinas offshore areas abound in oil & gas resources, but both the intensity of prospecting and the produced outputs are low, as a result, there exists a lot of development potential. Our pursuit to develop offshore marginal oilfields relies on up to date scientific and technological progress as well as modern development management and innovative technologies. China has developed domestically the designed technologies for beach and shallow water areas oil field operations. These technical and engineering systems have been adapted to meet Chinas characteristic, operational features and requirements. Despite of our ongoing efforts, it has not yet met the top international quality standards with regard to the demand for special oil gas bearings and project developments in the middle deep sea areas. The author will analyze the technical shortcomings of beach and shallow water areas exploration engineering, attempts to improve the recovery efficiency, offshore surface engineering technologies, production safeguards etc. A prognosis for the direction and innovate approach used in future management planning and project designs will be given.展开更多
基金supported by the National Natural Science Foundation of China (Nos. 41230318, 41176077, 4130 4096)the National High-tech R&D Program of China (863) (No. 2013AA092501)+2 种基金the PhD Program Foundation of the Ministry of Education of China (No. 201301 32120014)the Fundamental Research Funds for the Central Universities (Nos. 1313017, 1362013)Major National Science and Technology Programs (No. 2016ZX 05024-001-002)
文摘The stability of submarine geological structures has a crucial influence on the construction of offshore engineering projects and the exploitation of seabed resources. Marine geologists should possess a detailed understanding of common submarine geological hazards. Current marine seismic exploration methods are based on the most effective detection technologies. Therefore, current research focuses on improving the resolution and precision of shallow stratum structure detection methods. In this article, the feasibility of shallow seismic structure imaging is assessed by building a complex model, and differences between the seismic interferometry imaging method and the traditional imaging method are discussed. The imaging effect of the model is better for shallow layers than for deep layers because coherent noise produced by this method can result in an unsatisfactory imaging effect for deep layers. The seismic interference method has certain advantages for geological structural imaging of shallow submarine strata, which indicates continuous horizontal events, a high resolution, a clear fault, and an obvious structure boundary. The effects of the actual data applied to the Shenhu area can fully illustrate the advantages of the method. Thus, this method has the potential to provide new insights for shallow submarine strata imaging in the area.
基金supports funded by the National Natural Science FoundationShenhua Corporation Limited Jointly Funded Project of China (No. U1361213)+1 种基金Jiangsu Province Science Fund for Distinguished Young Scholars(BK20140005)College student innovation entrepreneurship Funded Project(CUMT,201405)
文摘In shallow burial mining areas, abnormal CO emission and the spontaneous combustion of coal are great threats to safety production at a fully-mechanised working face. In order to prevent the CO concentration in the air return corner from exceeding the critical limit, the paper studied the CO emission regularity and characteristics through theoretical analysis, experimental research and field observation. The results show that the main sources of CO emission were the spontaneous combustion of coal in the goaf and the exhaust emissions coming from underground motorised vehicles. The effect factors of CO emission were also investigated, such as seasonal climate changes, the advancing distance and advancing speed of the working face, the number of underground motorised vehicles and some other factors. In addition to these basic analyses, the influence mechanism of each influence factor was also summarised theoretically. Finally, this study researched the distribution and change law of CO concentration in the fully-mechanised working face in two aspects: controlling the change of monitoring points and time respectively. The research results provide a theoretical basis for preventing the CO concentration from exceeding the critical limit in the air return corner and reducing the possibility of spontaneous combustion of coal. Additionally, the results also provide important theoretical and practical guidelines for protecting miners' health in modern mines featuring high production and high efficiency all over the world.
文摘The article considers peculiarities of underwater monitoring of moving objects in the shallow water areas, particularly seaports. These areas are characterized by a multitude of factors influencing the efficiency of detection. Nonstationarity conditions of sound propagation and specific interference caused by shipping are the major factors. The various algorithms for the space-time signal processing have been tested and some experimental results are presented. It has been shown that the use of clipped mode in conjunction with the correlation processing of wideband signals and subsequent speckle tracking allow realizing high efficiency of monitoring.
文摘Chinas offshore areas abound in oil & gas resources, but both the intensity of prospecting and the produced outputs are low, as a result, there exists a lot of development potential. Our pursuit to develop offshore marginal oilfields relies on up to date scientific and technological progress as well as modern development management and innovative technologies. China has developed domestically the designed technologies for beach and shallow water areas oil field operations. These technical and engineering systems have been adapted to meet Chinas characteristic, operational features and requirements. Despite of our ongoing efforts, it has not yet met the top international quality standards with regard to the demand for special oil gas bearings and project developments in the middle deep sea areas. The author will analyze the technical shortcomings of beach and shallow water areas exploration engineering, attempts to improve the recovery efficiency, offshore surface engineering technologies, production safeguards etc. A prognosis for the direction and innovate approach used in future management planning and project designs will be given.
