我国干热岩资源分布及勘探:进展与启示   总被引：3，自引：0，他引：3  

蔺文静  王贵玲  邵景力  甘浩男  谭现锋 《地质学报》2021,95(5):1366-1381

干热岩是地热资源的重要赋存形式之一,是未来地热开发的主攻方向.我国干热岩勘查工作近年来进展迅速,先后在不同地区发现了优质的干热岩资源,取得了我国干热岩资源勘查突破,但同时也存在不少勘查失败的案例.本文在分析高放射性产热型、沉积盆地型、近代火山型和强烈构造活动带型等四种类型干热岩成因模式的基础上,结合我国的地质构造背景、地热地质条件,对未来我国干热岩资源重点勘查方向及靶区进行了论述,并重点针对目前不同类型区干热岩资源勘探工程进行了梳理,简要分析了不同勘探区的选址依据、勘探过程、地温场分布及特征、前景预测等,并初步进行了经验总结,希望对我国未来干热岩资源勘查及开发工作起到借鉴作用.  相似文献   

滇西北石鼓杂岩中花岗质片麻岩年代学、地球化学特征及地质意义     

罗改  张彤  贾小川  杨学俊  肖典  谭晓莲 《地质学报》2021,95(11):3335-3351

青藏高原东南缘滇西北前寒武纪石鼓变质杂岩中新识别出一套花岗质片麻岩.采用LA-ICP-MS方法进行锆石U-Pb年代学分析,获得206Pb/238 U加权平均年龄分别为790±11 Ma(MSWD=2.1,n=10)和814±15 Ma(MSWD=5.7,n=9),显示其形成于新元古代早期.地球化学特征显示,岩石具有高硅(SiO2=66.05％～77.16％)、高 K2O/Na2O(0.90～9.26,均值2.57)特征,MgO=0.35％～3.60％,TFeO=1.02％～4.86％,P2O5=0.03％～0.17％.铝饱和指数A/CNK为1.08～2.51,矿物组合中出现石榴子石和白云母等富铝矿物,CIPW标准矿物中刚玉分子平均含量为4.72％,显示为强过铝质花岗岩.球粒陨石标准化稀土配分显示轻稀土元素富集,(La/Yb)N=1.79～12.34,具明显的Eu负异常(δEu=0.21～0.67).原始地幔标准化蛛网图显示,岩石富集Rb、U,明显亏损Ba、Ta、Nb、Sr、P、Ti元素.综合分析认为,花岗质片麻岩原岩主要为低成熟度、黏土贫乏的砂质岩在高温条件下部分熔融的产物,形成于后碰撞构造环境,是Rodinia超大陆汇聚事件在滇西北石鼓地区的响应.  相似文献   

Dynamic Response and Mechanical Behaviours of Geogrid for High Earth-rockfill Dams     

Zhu  Yalin  Ma  Chi  Tan  Kun  Chen  Juxiang  Wang  Yixian 《Geotechnical and Geological Engineering》2021,39(8):5479-5492

Geotechnical and Geological Engineering - Due to the complexity of the interaction between the geogrid and the soil interface in high earth-rock dams, the method of replacing the grid with steel...  相似文献   

川西北下二叠统栖霞组微生物丘的发现及地质意义^*     

全子婷  谭秀成  张本健  唐浩  罗冰  杨迅  张亚  肖笛  汤艳玲 《古地理学报》2021,23(6):1110-1124

通过野外露头与钻井剖面的室内外分析,确认在四川盆地西北部(川西北)下二叠统栖霞组中发育有微生物丘,它们主要由凝块灰(云)岩、叠层灰(云)岩和微生物粘结颗粒灰(云)岩等组成。这些微生物碳酸盐岩发育较为典型的凝块、叠层、窗格、粘结等组构。微生物丘大小不一,实测高度一般为几十厘米至几米,宽度通常变化于几米至几十米之间,具有底平顶凸的典型丘形外貌,以发育向上变浅的沉积序列为特征,一般由丘基、丘核、丘盖3个微相组成,也可与颗粒滩共同构成微生物丘滩复合体。基于区域古地理背景和微生物丘特征的剖析,认为川西北地区栖霞期沉积环境总体受限,推测为半局限—局限台地环境,水深较浅,能量普遍不高;海平面频繁的相对升降变化和微生物丘的侧向迁移叠置,导致发育于缓坡背景下的碳酸盐岩台地极易受限,引起早期沉积物发生与丘滩发育密切相关的准同生期白云石化作用。因此,微生物丘滩复合体是栖霞组白云岩储集层发育的物质基础,台缘坡折带、台内缓坡折带和高地是栖霞组白云岩储集层发育的有利区带,这对寻找规模性层位不稳定的带状白云岩储集层具有重要的指导作用,并将大大拓展栖霞组白云岩储集层的勘探领域。  相似文献   

中国农业气象模式(CAMM1.0)构建与应用          下载免费PDF全文

马玉平  霍治国  王培娟  俄有浩  邬定荣  房世波  谭凯炎  张祎  孙琳丽  杨建莹  赵俊芳  周梦子  赫迪  徐嘉昕  毛飞  姜朝阳 《应用气象学报》2019,30(5):528-542

为发展适宜中国区域农业种植特点的农业气象模式,基于国外作物生长模拟方法,通过模式机理过程改进或重构以及应用方式革新,建立了中国农业气象模式（Chinese AgroMeteorological Model version 1.0,CAMM1.0）。CAMM1.0利用平均温度和土壤水分改进了作物发育进程模式,利用土壤水分改进了作物叶片光合作用、干物质分配和叶面积扩展过程模式,通过蒸发比法扩展了作物蒸散过程模式;自主建立了基于发育进程的冬小麦株高、基于遥感信息的作物灌溉、遥感数据同化、作物长势与灾害评价等模式。基于互联网技术构造了实时运转平台,主要功能包括作物生长过程实时常规模拟与用户个性化定制模拟。CAMM1.0的部分子模式采用多种方法构造,便于多模式集成。CAMM1.0对作物发育进程、光合过程、株高的模拟效果较好,但对土壤水分变化过程的拟合略差,模拟产量略偏低。CAMM1.0评价淮河流域夏玉米年际干旱减弱而涝渍增加的趋势与实际基本相符。  相似文献   

Characterizing the hydraulic properties of unsaturated sand considering various porosities and drying‐wetting paths of the retention curve     

Kai‐yuan Ke  Yih‐Chi Tan  Chu‐Hui Chen  Hsien‐Tsung Lin 《水文研究》2013,27(4):592-604

Previous studies have shown that water retention curve (WRC) and the hydraulic conductivity vary because of changes of the void ratio or porosity of soil. However, limited documents pointed out the change of hydraulic properties of soil when compacted to different porosities while considering both of the drying and wetting processes of the WRC. This information is sometimes necessary for research like finger flow analysis or the occurrence of wetting and drying cycles as what would be seen in the field. Therefore, this study aims to examine the change of WRC characteristics with varied porosity considering both of the drying and wetting path in WRC by conducting a sand box experiment. Results show that the same type of sand compacted to various porosities have different hydraulic parameters. Hydraulic conductivities generally decrease with reduced porosities; shape parameter α of the van Genuchten equation (1980) linearly decreases with declining porosity and shape parameter n in a reversal manner for the sands of interest whether in the drying process or wetting process. The unsaturated properties of sand are further characterized by inspecting the variations of moisture content, matric suction and vertical displacement of soil body subject to periodic changes of the water level by another sand box experiment. The outcomes suggest that the saturated water content and residual water content are changing during the wetting–drying process, which can be an implication of the changed properties of WRC. The characteristics of volumetric deformation might be varied as well because of the observation of the dissimilar patterns of the changing vertical displacements among each wetting–drying process. Infiltration patterns of the sands also are identified through numerical modelling by introducing a constant infiltration flux from the surface followed by a no‐influx condition. Results indicate that less water accumulates in the sand near the surface for the sand compacted to higher porosity, but water can move deeper. Hydraulic conductivity is found as the prime factor dominating the evolvement of wetting fronts. However, shape parameters of water retention curves also affect the infiltration pattern to some extent. In addition, different sands with similar porosities can have quite different infiltrating characteristics. Copyright © 2012 John Wiley & Sons, Ltd.  相似文献   

Compact and tunable mid-infrared source based on a 2 μm dual-wavelength KTiOPO₄ intracavity optical parametric oscillator     

耿优福  谭晓玲  李学金  姚建铨 《海洋学报(英文版)》2010,29(11)

Using a double resonant KTiOPO₄ (KTP) intracavity optical parametric oscillator operating at degenerated point of 2 μm, we demonstrate a unique mid-infrared source based on difference frequency generation in GaSe crystal. The output tuning range is 8.42-19.52 μm, and a peak power of 834 W for type-I phase matching scheme and 730 W for type-II phase matching scheme are achieved. Experimental results show that this oscillator is a good alternative to the generator of a compact and tabletop mid-infrared radiation with a widely tunable range.  相似文献   

天然河道一维不恒定流计算的守恒格式   总被引：2，自引：2，他引：2       下载免费PDF全文

谭维炎  胡四一 《水科学进展》1990,1(1):22-32

本文从数值计算的角度分析和讨论了天然河道一维不恒定流方程组的各种形式及其差分格式的守恒性。据此,本文总结了建立守恒差分格式的途径和应遵循的原则,并就差分格式如何达到准确或近似守恒提出了实际的处理方法。  相似文献   

焦耳效应标定高温卡尔维微量热计     

Tang Yuanjun Tan Dafang Mao Yi 《地球科学》1989,(3)

根据热流式量热计的Tian氏方程,用焦耳效应标定高温卡尔维微量热计。用偏差法得到的灵敏度值与积分法测得的值一致。用回归曲线对灵敏度实验值进行拟合,利用计算机求得灵敏度—温度回归曲线,得到了室温至700℃的全部灵敏度值,从而即可使用微量热计测量此温度范围内的未知样品热效应。  相似文献   

地震拓扑预测     

谭承业  阮圣娜 《地震研究》1989,12(3):193-200

本文对地震参数建立了地震拓扑空间并把灰色系统理论中的拓扑预测方法引入地震预测之中,研究地震长趋势的预测问题。  相似文献