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Porosity Distribution Characteristics and geological analysis of Brine Storage Medium in the Qaidam Basin, Western China

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Chinese Geographical Science 2018年第4期28卷 707-716页

作者： HU Shuya XIAO Changlai LIANG Xiujuan ZHAO Quansheng WANG Guangcai ZHANG Jianwei FENG Juan Key Laboratory of Groundwater Resources and Environment of the Ministry of Education Jilin University College of Environmental and Resources Jilin University Department of Environmental Science and Engineering Qingdao University School of Water Resources and Environment China University of Geosciences

Underground brine is an unusual water resource that contains abundant mineral resources. It is distributed widely in the Qaidam Basin, western China, a hyperarid inland basin located in the northern Tibetan Plateau. Pores in the brine storage medium act as storage space and transmission channels of underground brine. Therefore, the porosity of brine storage medium determines its ability to store brine. In this study, Mahai Salt Lake was used as the research area as a modern saline lake located in the north area of the Qaidam Basin. A total of 100 porosity samples were collected from eight sampling points in two profiles of the research area at sampling depths of 1.30–314.78 m. The porosity distribution characteristics and influencing factors in brine storage medium were analysed according to the measured porosity data. Based on analysis of the pore structure characteristics, the brine storage medium contains intercrystalline pores, unlike conventional freshwater storage mediums. Moreover, the primary salt rock is susceptible to dissolution by lighter brine, facilitating the formation of secondary porosity. Due to the formation of secondary pores, a porosity greater than 20% remains even at buried depths greater than 100 m. Based on the geological statistical analysis, due to the geographic location, salt formation time, and depositional environment, the porosity values of Mahai Salt Lake do not exhibit a wider distribution, but also show more extreme values than a nearby salt lake. Based on the porosity characteristics by depth, due to the presence of secondary pores, flooding, stratigraphic static pressure, and other factors, porosity shows fluctuations with increasing depth.

关键词： porosity brine storage medium distribution characteristics geological analysis salt lakes in Qaidam Basin

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Extraction and imaging of indicator elements for non-destructive,in-situ,fast identification of adverse geology in tunnels

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International Journal of Mining Science and Technology 2023年第12期33卷 1437-1449页

作者： Fumin Liu Peng Lin Zhenhao Xu Ruiqi Shao Tao Han School of Qilu Transportation Shandong UniversityJinan 250061China Geotechnical and Structural Engineering Research Center Shandong UniversityJinan 250061China

The lag in quantitative methods and detection techniques for geologic information has resulted in time-consuming and human-experienced geologic analysis in *** indicators of rocks can be used to identify adverse geology and to explain the intrinsic causes of damage to normal *** study proposes a method to identify adverse geology by extracting and imaging the indicator *** mapping relationship between rock components and geologic bodies is quickly determined by indicator element extraction based on factor analysis,and then the data are gridded for image *** location and size of the target adverse geology are visually identified through the distribution images of the indicator elements,thus reducing data dimensions and analysis time.A non-destructive,in-situ and fast element detection technique in tunnels was adopted to speed up the process of geology *** accuracy of the detection was validated by comparing field and laboratory test *** study further confirms and refines the previous research,and the results provide references for geological,mining and underground projects.

关键词： Adverse geology identification Indicator elements Rock geochemistry Tunnel engineering geological analysis

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