东海陆架区地热研究   总被引：3，自引：2，他引：3  

许薇龄  魏大卫 《地球物理学进展》1995,10(2):32-38

通过对东海陆架八口石油钻井岩岩芯采样，测定其热导率，并求取对应的地温梯度，据傅立叶定律计算单井的热流密度，在５６－８８．６０ｍＷ／ｍ＾２之间，填补了东海陆架热流值测定的空白。  相似文献   

利用气象地温资料反演大地热流   总被引：8，自引：0，他引：8       下载免费PDF全文

魏东平  汤懋苍 《地球物理学报》1992,35(6):733-739

利用气象台记录的深度为0.8m,1.6m和3.2m的月平均地温资料,进行Fourier频谱分析,得到定常波和子谐波（变化波）两部分.同时取地表以下为水平分层的均匀双层介质,建立数学模型,根据线性热传导和最优化理论对定常波以及子谐波的振幅谱和相位谱进行联合反演,计算气象台地表附近的定常地温梯度以及地表土壤的热扩散系数等物性参数,并据此计算该地的大地热流值.初步计算结果表明,上述方法得到的某些地区的大地热流值与传统的通过钻孔测量法得到的大地热流值符合得相当好.  相似文献   

渤海湾盆地东营凹陷碎屑流主控型深水体系沉积过程及模式          下载免费PDF全文

刘建平  鲜本忠  张莉  苏明  李宇志  闫海清  王震  陈鹏  吴千然  李晋  田荣恒  杨鑫  周欢焕  罗勋  陈龙 《中国地质》2022,49(6):1951-1969

【研究目的】碎屑流是深水环境沉积物搬运和分散的重要机制,其相关的砂岩储层是含油气盆地重要的勘探目标,然而,与经典浊流及浊积系统相比,对碎屑流主控型深水体系的发育规律目前仍知之甚少。【研究方法】本文基于岩心、测井及全三维地震资料,通过系统的岩心观察描述、测井及地震资料解释,对渤海湾盆地东营凹陷始新统沙三中亚段深水体系沉积过程及模式开展研究。【研究结果】结果表明,沙三中深水体系发育九种异地搬运岩相,可概括为四大成因类型,反映了块体及流体两种搬运过程。岩相定量统计表明,该深水体系主要由碎屑流沉积构成,浊流沉积很少,碎屑流中又以砂质碎屑流为主。重力流在搬运过程中经历了滑动、滑塌、砂质碎屑流、泥质碎屑流及浊流等5个阶段演变,发育5类主要的深水沉积单元,包括滑动体、滑塌体、碎屑流水道、碎屑流朵体及浊积薄层砂。从发育规模及储层物性上,砂质碎屑流水道、朵体及砂质滑动体构成了本区最重要的深水储层类型。【结论】认为沙三中时期充足的物源供给、三角洲前缘高沉积速率、断陷期频繁的断层活动以及较短的搬运距离是碎屑流主控型深水体系形成及演化的主控因素,最终基于沉积过程、沉积样式及盆地地貌特征综合建立了碎屑流主控型深水体系沉积模式。本研究将进一步丰富深水沉积理论,为陆相深水储层预测提供借鉴。  相似文献   

1948～2004年全球越赤道气流气候变化   总被引：5，自引：0，他引：5  

施能  封国林  顾骏强  谷德军 《热带气象学报》2007,23(4):326-332

利用1948年1月～2004年12月逐月NCEP/NCAR的全球1000 hPa、850 hPa、700 hPa、600 hPa、500 hPa、400 hPa、300 hPa、200 hPa、150 hPa、100 hPa的10层经向格点风,计算了全球越赤道气流和年变化,分析了全球850 hPa越赤道气流通道的时、空变化特征。指出在研究的时间段内,全球850 hPa越赤道气流有明显的长期趋势变化和年代际变化。近57年,6～8月的45～50°E、5～9月的105～115°E、5～9月和5～11月的130～140°E、2～4月的20～25°E的越赤道气流有明显的加强,6～8月的50～35°W的越赤道气流减弱。夏季索马里的越赤道气流,平均每10年增强0.25 m/s,而130～140°E,5～9月的越赤道气流,平均每10年增强0.32 m/s。奇异谱分析表明,850 hPa越赤道气流的年代际变化和趋势变化的方差贡献达到35%～45%。年际变化的方差贡献不超过30%,还指出夏季太平洋的越赤道气流的强度变化与南方涛动有明显关系,弱南方涛动时,有强的越赤道气流。而索马里急流强度与北大西洋涛动有弱的正相关。  相似文献   

对台风麦莎(2005)的熵流特征初步分析          下载免费PDF全文

徐辉  柳崇健 《热带气象学报》2008,24(4):313-319

根据热力学第二定律推导出熵平衡方程,并在数值模拟输出结果的基础上利用熵平衡方程中的熵流项来分析2005年台风"麦莎"发生、发展和消亡各阶段的熵流特征.(1) 从对流层的低层到对流层的高层,台风中心附近的熵流分布会逐渐由负熵流占优势互补趋向于以正熵流为主;(2) 对流层中层500 hPa的负熵流分布显示出,随着台风的强度加强(减弱),台风中心附近的负熵流强度也会随之加强(减弱);(3) 台风中心附近的负熵流分布和强度特征对于台风强度和未来移动路径有一定的指示意义.  相似文献   

青南高原大气降水变化规律及其对黄河上游地区水资源的影响   总被引：4，自引：1，他引：3  

时兴合  张国胜  李林  汪青春  唐红玉  白彦芳 《气候与环境研究》2000,5(2):195-200

利用1959～1997年黄河上游地区降水、流量资料,用EOF、REOF等数理统计方法,分析了黄河上游地区降水与流量之间的关系,并对黄河上游地区的水资源进行了估算。分析得出：龙羊峡年入库流量的丰枯主要与黄河上游地区的年降水量有关,春季流量的丰枯主要与上一年秋季的流量、春季的降水量有关,夏、秋季流量的丰枯主要与同期的降水量有关。  相似文献   

Effects of strong ground motion on the susceptibility of gully type debris flows   总被引：5，自引：0，他引：5  

Chia-Nan Liu  Jia-Jyun Dong  Yih-Ferng Peng  Hsiao-Fung Huang 《Engineering Geology》2009,104(3-4):241-253

Typhoon Herb in 1996 caused widespread debris flows in central Taiwan. The 7.3 Chi-Chi earthquake on September 21, 1999, which also took place in central Taiwan, induced many landslides in the region. These landslides turned into debris flows when Typhoon Toraji struck Taiwan in 2001. This research selects three regions which suffered a ground motion class of 5, 6, and 7 on the Richter scale during the Chi-Chi earthquake as study areas. Air photos from 1997 and 2001 of these regions are used to map the gully-type debris flows that took place after Typhoons Herb and Toraji, respectively. The gullies adjacent to the debris flow, but without a trace of debris flows, are also mapped as the non-debris flow data. The topography, hydrogeology, and rainfall factors – where debris flow occurred and in which there was no occurrence of debris flows in these gullies were retrieved from DTM, geological maps, and iso-countour maps, and of rainfall through GIS processing. These characteristic are introduced into a probabilistic neural network to build a predicting model for the probability of the occurrence of debris flows. Three series of cross analyses are conducted to compare the probability of the occurrence of debris flows of the same dataset predicted by different prediction models. The results reveal that the susceptibility of debris flows was elevated after the Chi-Chi earthquake struck. The upsurge of susceptibility was more obvious for the regions that received a higher class of ground motion.  相似文献   

Decoupling between the middle and upper crust during transpression-related lateral flow: Variscan evolution of the Aston gneiss dome (Pyrenees, France)     

Yoann Denle  Philippe Olivier  Grard Gleizes  Pierre Barbey 《Tectonophysics》2009,477(3-4):244

We present a structural, AMS, microstructural and kinematic study of the Aston gneiss dome (French Pyrenees), which consists of a core made up of orthogneiss and paragneiss intruded by numerous sills of Carboniferous peraluminous granite. The orthogneiss corresponds to a former Ordovician granitic laccolith. Four Variscan events have been evidenced in this gneiss dome: (i) D1 deformation observed only as relics in the orthogneisses and their country-rocks located above the sillimanite isograd, and characterized by a NS to NE–SW non coaxial stretch associated to top to the south motions (NS convergence); (ii) D2-a deformation observed in the orthogneisses and their country-rocks, mainly migmatitic paragneisses, located below the sillimanite isograd and in the peraluminous granites whatever their structural level, and characterized by an EW to N120°E stretch associated to a top to the east flat shearing (lateral flow in the hot middle crust in a transpressive regime); (iii) D2-b deformation characterized by EW-trending megafolds corresponding to the domes in the middle crust and by EW-trending tight folds with subvertical axial planes in the metasedimentary upper crust; (iv) subvertical medium-temperature mylonitic bands developed by the end of the transpression.The Aston massif is a good example of decoupling between a cold upper crust and a hotter middle crust overheated by a thermal event originated in the upper mantle. This decoupling allowed the lateral flow of the migmatitic middle crust along a direction at high angle with respect to the more or less NS-trending direction of convergence. We suggest that the HT-LP metamorphism developed before the formation of the domes during D2-a, coevally with the emplacement of numerous sills of peraluminous granite, whereas the emplacement of the large calc-alkaline plutons in the upper crust occurred by the end of D2-b. Our data invalidate the previous geodynamical models based on either early or late extensional regime to explain the development of the HT-LP metamorphism. This new interpretation of the dynamics of the Variscan crust of the Pyrenees is consistent with recent studies conducted in Archaean and Palaeoproterozoic hot continental crusts having undergone oblique convergence, and characterized by a competition between vertical thickening and lateral flow induced by the important rheological contrast between two thermally different levels.  相似文献   

基于测井资料的储层流动单元划分——以尕斯库勒油田为例   总被引：5，自引：2，他引：3  

胡景双  邵先杰  马平华  王萍  单宇 《地质科技情报》2009,28(5)

依据尕斯库勒油田实际资料,分析了粒度中值、泥质体积分数、灰质体积分数、孔隙度与渗透率以及与测井曲线之间的关系,建立了一套直接利用测井资料进行储层流动单元划分的技术方法,实现了流动单元纵向上的连续自动划分.采用聚类分析方法,把储层划分为E、G、M和P 4类,平面上流动单元的分布主要受沉积微相控制,E、G类流动单元主要沿水下分流河道的主流线分布,G类流动单元主要分布在河口砂坝和河道侧缘,M类流动单元分布在席状砂部位,P类流动单元零星分布在砂体尖灭的边缘部位.  相似文献   

三棱柱形网格下自由表面流的三维数值模拟   总被引：1，自引：0，他引：1       下载免费PDF全文

王昆  金生  马志强  高述峰 《水科学进展》2009,20(4):490-494

为了模拟自由表面流动问题,建立了基于三棱柱形网格的三维Navier-Stokes方程的半隐式动压离散模型。出流边界采用在动量方程右端附加线性衰减项的海绵层处理方式来消减波能。引入k-ε双方程紊流模型求解涡黏性系数,使方程达到封闭。用规则周期波通过淹没障碍物的传播变形和复合明渠流动算例,验证了当遇到短波高频问题时,所述模型模拟结果与测量值吻合良好,体现了模型的精确性和有效性。  相似文献