从显微煤岩学角度探讨六盘水地区龙潭煤系低煤级煤的生烃状况     

刘惠永  翁成敏  张爱云 《现代地质》1998,12(3):406

摘 要　 从显微煤岩学角度探讨了贵州六盘水地区晚二叠世龙潭煤系煤的生烃状况。研究表 明‚树皮体和基质镜质体是研究区煤岩显微组成中主要的两种富氢组分‚“富镜质体 较富树 皮体” 是主采煤层典型的煤岩组合特征‚在成烃演化过程中‚富氢镜质体和树皮体对生烃作 出了主要贡献。渗出沥青体充填于镜质体微裂隙或细小孔洞以及丝质体胞腔中。这些微裂隙 和胞腔对煤成油的保存、富集和运移起到关键作用。显微组分间的这种配置关系为煤成油藏 的形成提供了非常有利的条件。六盘水地区具有形成煤成油藏的母质条件‚同时在煤层中具 有较好的保存富集以及运移条件‚如果存在有利的地质背景与之相配合‚研究区煤成油藏的 勘探开发工作将具有十分乐观的前景。  相似文献   

Applying Quantitative Molecular Tools for Virus Transport Studies: Opportunities and Challenges          下载免费PDF全文

Kelvin Wong  Marirosa Molina 《Ground water》2017,55(6):778-783

Bacteriophages have been used in soil column studies for the last several decades as surrogates to study the fate and transport behavior of enteric viruses in groundwater. However, recent studies have shown that the transport behavior of bacteriophages and enteric viruses in porous media can be very different. The next generation of virus transport science must therefore provide more data on mobility of enteric viruses and the relationship between transport behaviors of enteric viruses and bacteriophages. To achieve this new paradigm, labor intensity devoted to enteric virus quantification method must be reduced. Recent studies applied quantitative polymerase chain reaction (qPCR) to column filtration experiments to study the transport behavior of human adenovirus (HAdV) in porous media under a variety of conditions. A similar approach can be used to study the transport of other enteric viruses such as norovirus. Analyzing the column samples with both qPCR and culture assays and applying multiplex qPCR to study cotransport behavior of more than one virus will provide information to under‐explored areas in virus transport science. Both nucleic acid extraction kits and one‐step lysis protocols have been used in these column studies to extract viral nucleic acid for qPCR quantification. The pros and cons of both methods are compared herein and solutions for overcoming problems are suggested. As better understanding of the transport behavior of enteric viruses is clearly needed, we strongly advocate for application of rapid molecular tools in future studies as well as optimization of protocols to overcome their current limitations.  相似文献   

Mortality risk of a future heat event across a subtropical city: implications for community planning and health policy     

Ho  Hung Chak  Wai  Ka Ming  He  Minhao  Chan  Ta-Chien  Deng  Chengbin  Wong  Man Sing 《Natural Hazards》2020,103(1):623-637

Natural Hazards - In this study, we applied the Weather Research and Forecasting model to project 2050 urban and rural temperature. We applied a time-stratified analysis to compare it with...  相似文献   

Spatial and temporal changes in estuarine water quality during a post-flood hypoxic event     

Vanessa N.L. Wong  Scott G. Johnston  Richard T. Bush  Leigh A. Sullivan  Christina Clay  Edward D. Burton  Peter G. Slavich 《Estuarine, Coastal and Shelf Science》2010

A major fish kill occurred in the Richmond River estuary in January 2008 due to oxygen depletion following extensive overbank flooding. This paper examines spatial and temporal changes in the chemistry of main channel waters, thereby identifying the primary sources of deoxygenating water. Over 40 km of the mid- to lower estuary main channel was deoxygenated within seven days of the flood peak. Hypoxia was confined to downstream of the confluences with mid-estuary backswamp basins and occurred during the later phase of the flood recession. Water chemistry at key locations in the estuary indicated elevated concentrations of redox sensitive species associated with acid sulfate soils (ASS) during the hypoxic period. Peak concentrations of Fe²⁺ up to 18.2 μmol L⁻¹, dissolved Mn up to 4.3 μmol L⁻¹, chemical oxygen demand (COD) up to 2052 μmol L⁻¹, dissolved organic carbon (DOC) up to 960 μmol L⁻¹ and elemental S⁰ up to 4.7 μmol L⁻¹ were found in the backswamp discharge confluences and mid-estuary main channel locations. The geochemical signature of main channel floodwaters identifies anaerobic decomposition of floodplain vegetation in ASS backswamps as a primary process leading to generation of hypoxic waters. The transport of these hypoxic floodwaters to the estuary has been accelerated and prolonged by extensive floodplain drainage, thereby enhancing the magnitude and duration of estuarine deoxygenation.  相似文献