辽南地区金州西团瓢湖沼相沉积物粒度化学特征及环境意义

湖泊沉积物以其沉积速率快、连续性好、分辨率高等特性成为研究历史时期气候变化的理想载体。辽东半岛南部处于亚欧大陆东岸,保留多处典型的湖相沉积。以辽南地区金州西团瓢湖沼相沉积物为研究载体,通过野外调查与室内粒度、化学元素、烧失量、电导率实验相结合的方法,探讨了该区域的环境变化。结果表明：研究区沉积期气候经历了寒冷干燥（15.64～30.81 kaBP）－寒冷干旱（10.36～15.64 kaBP）－温暖干旱（5.77～10.36 kaBP）－温暖湿润（0.90～5.77 kaBP）－温凉干旱（0.90 kaBP至今）5个阶段,结合地球化学指标的对比分析,初步认为端元1可能指示东亚季风及坡面流水带来的细颗粒沉积物,端元2可能代表动力较低的弱水流沉积物,端元3则可能代表动力较强的冲洪积物。     

大亚湾海域多环芳烃和有机氯农药的高分辨率沉积记录

以GC／ECD和GC／MS内标法分析测定了大亚湾沉积物柱样（DYW03—8）中多环芳烃（PAHs）和有机氯农药（0CPs）的含量，结合^210Pb定年，重建了该海域近50年来PAHs和OCPs的污染历史，并对其可能的来源和输入途径进行了探讨。结果表明，近50年来该海域沉积物中PAHs和OCPs的含量总体上均呈上升趋势，且一般都在上世纪90年代以后这种上升变得更加明显；PAHs主要来源于化石燃料的不完全燃烧，即热成因，并可能主要通过大气颗粒物沉降以及工业和生活污水的直接排放等途径进入水体沉积物中；HCHs和DDTs的组成特征及其变化趋势揭示，该区可能曾大量使用过林丹（γ-HCHs）作为杀虫剂，近15年来随着该地区各种经济开发活动的加强，残留在土壤中的这些农药组分更多地随地表径流进入到水体沉积物中。同时，DDTs类农药也可能仍存在新的输入源，但这种输入的强度在近几年似乎有所减弱。     

大亚湾水域营养盐的分布变化

本文通过对大亚湾水域溶解氧，氮、磷、化学耗氧量、盐度、ＰＨ等环境因子的调查，对该水域溶解氧的含量分布和季节变化进行了分析，同时，对湾内ＮＯ３－Ｎ、ＮＯ２－Ｎ、ＮＨ４－Ｎ及ＰＯ４－Ｐ的时空分布以及季节变化规律进行了讨论，并以氧的饱和度、ＰＨ、化学耗氧量、无机氮等单项指标和综合指标研究了该水域的富营养状况。     

华北陆块北缘尚义地区下井-厂汉营韧性剪切带变形特征及年代学研究

华北陆块北缘晚古生代经历了多期构造事件,构造活动复杂多样,位于其中段的下井-厂汉营韧性剪切带构造变形强烈,研究其变形特征以及形成时代,对进一步探讨华北陆块北缘晚古生代构造演化特别是古亚洲洋晚阶段洋壳俯冲的时间和机制有重要意义.鉴于此,对该韧性剪切带进行了运动学和几何学实测剖面、显微构造解析及锆石LA-ICP-MS U-...     

地震序列类型预测的人工神经网络方法

本文提出预测地震序列类型的人工神经网络方法，并选取一组实例作为研究对象，验证了该方法的可靠性。结果表明，人工神经网络方法性能良好，可望成为地震序列类型预测的有效工具。     

Spatial and temporal evolution characteristics and causes of drought and flood in the Henan section of the Yellow River

Natural Hazards - Under the background of global warming, it is very important to explore the spatial–temporal evolution and causes of regional drought/flood for the realization of drought...     

根据施工曲线确定酸化液用量

根据达西公式导出了基质酸化效果同酸化液作用距离的关系式，并在此基础上提出根据现场施工曲线确定酸化用量的新方法     

An efficient method for evaluating the ground surface settlement of Hangzhou metro deep basement considering the excavation process

Acta Geotechnica - Based on the 16 collected well-documented excavation cases of the Hangzhou metro basement, the standard parameters of the basement, the standard excavation process, and the...     

致密低渗透砂岩储层多尺度天然裂缝表征方法

本文利用地表露头、岩芯、测井、三维地震和微观分析资料,根据多尺度裂缝的发育特征及不同资料的精度,探讨了多尺度裂缝的表征方法。致密低渗透砂岩储层发育多尺度天然裂缝,根据天然裂缝规模以及限制天然裂缝扩展延伸的岩石力学层界面,将天然裂缝分为大尺度裂缝、中尺度裂缝、小尺度裂缝和微尺度裂缝4级,不同尺度裂缝的发育特征存在较大差异。其中大尺度裂缝主要应用三维地震资料的叠后属性进行检测和表征;中小尺度裂缝在单井上可以应用岩芯、成像测井和常规测井相结合的方法进行表征,在平面上采用基于地质和测井约束的三维地震叠前各向异性分析以及储层地质力学相结合的方法进行综合预测和评价;微尺度裂缝一般应用铸体薄片、普通薄片、扫描电镜和三维CT扫描等微观分析方法进行观察描述,通过主控因素约束的方法进行预测。利用本文提出的多尺度裂缝表征方法实现了对鄂尔多斯盆地西南部致密砂岩储层多尺度裂缝表征,可为其它致密低渗透砂岩储层多尺度裂缝表征提供借鉴。     

Heat Aggregation Mechanisms of Hot Dry Rocks Resources in the Gonghe Basin,Northeastern Tibetan Plateau

Hot dry rock (HDR) is an important geothermal resource and clean energy source that may play an increasingly important role in future energy management. High-temperature HDR resources were recently detected in deep regions of the Gonghe Basin on the northeastern edge of the Tibetan Plateau, which led to a significant breakthrough in HDR resource exploration in China. This research analyzes the deep temperature distribution, radiogenic heat production, heat flow, and crustal thermal structure in the Qiaboqia Valley, Guide Plain, and Zhacanggou area of the Gonghe Basin based on geothermal exploration borehole logging data, rock thermophysical properties, and regional geophysical exploration data. The results are applied to discuss the heat accumulation mechanism of the HDR resources in the Gonghe Basin. The findings suggest that a low-velocity layer in the thickened crust of the Tibetan Plateau provides the most important source of constant intracrustal heat for the formation of HDR resources in the Gonghe Basin, whereas crustal thickening redistributes the concentrated layer of radioactive elements, which compensates for the relatively low heat production of the basal granite and serves as an important supplement to the heat of the HDR resources. The negative effect is that the downward curvature of the lithospheric upper mantle caused by crustal thickening leads to a small mantle heat flow component. As a result, the heat flows in the Qiaboqia Valley and Guide Plain of the Gonghe Basin are 106.2 and 77.6 mW/m2, respectively, in which the crust-mantle heat flow ratio of the former is 3.12:1, indicating a notably anomalous intracrustal thermal structure. In contrast, the crust-mantle heat flow ratio in the Guide Plain is 1.84:1, which reflects a typical hot crust-cold mantle thermal structure. The Guide Plain and Zhacanggou area show the same increasing temperature trend with depth, which reflects that their geothermal backgrounds and deep high-temperature environments are similar. These results provide important insight on the heat source mechanism of HDR resource formation in the Tibetan Plateau and useful guidance for future HDR resource exploration projects and target sites selection in similar areas.