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   

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^*          下载免费PDF全文

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   

华北克拉通南缘大庄铌-稀土矿床地质、地球化学和Sr、Nd、Pb同位素特征     

李志丹  李山坡  曾威  李效广  潘小娜  张哨波  郭虎  刘文刚 《地质学报》2023,97(1):82-108

碱性岩型铌-稀土矿床是重要的铌-稀土矿资源类型。河南省方城县大庄铌-稀土矿位于华北克拉通南缘,是近年来新发现的一例赋存于霞石正长岩中的,具有中型规模的碱性岩型矿床。大庄矿区内共圈定17个NW—SE向带状展布的,呈囊状、不规则状、透镜状产出的铌-稀土矿体。铌-稀土矿石主要赋存于角闪霞石正长岩和黑云母正长岩中。矿石矿物主要为烧绿石、氟碳铈镧矿、褐钇铌矿和富铌榍石等。矿石的结构主要有斑状结构、他形粒状结构、半自形粒状结构、包含结构、交代结构、共生结构、伟晶结构等。矿石构造分为块状、脉状和片麻状构造等。热液蚀变包括萤石化、绢云母化、绿帘石化和绿泥石化等。碱性岩样品具有低SiO₂、富碱、高铝的特征,稀土元素总量较高,轻重稀土分异明显,具有明显的负Eu异常,富集Nb、Ta、Th、U、Zr、Hf等高场强元素,明显亏损Ba、Sr、P、Ti等元素。碱性岩全岩(⁸⁷Sr/⁸⁶Sr)_i=0.68158～0.71090,ε_Nd(t)=―1.11～―0.37,两阶段模式年龄(t_DM2  相似文献   

基于ShakeMap_CNST的2017年精河6.6级地震灾害快速评估     

刘军  谭明  宋立军  郝婧  毕雪梅  王新刚  常想德 《中国地震》2019,35(2):381-388

基于考虑区域地震动衰减关系、场地效应及震中破裂等多因素的烈度快速评估模型，结合震害预测方法，研发了一套震害预测系统，并以2017年8月9日精河M_S6.6地震的震害预测为例，将对其的预测结果与当前主流系统进行对比。结果表明，采用ShakeMap_CNST系统能对地震的影响范围和烈度进行更为准确的估计，在人员伤亡、受灾人口估计、紧急安置人数及经济损失评估等方面，相对于其他系统，本系统的结果与现场调查的结果更为接近。  相似文献   

Scaling-laws of Radio Spike Bursts and Their Constraints on New Solar Radio Telescopestwo     

Tan Bao-lin  Cheng Jun  Tan Cheng-ming  Kou Hong-xiang 《Chinese Astronomy and Astrophysics》2019,43(1):59-74

Radio observation is one of important methods in solar physics and space science. Sometimes, it is almost the sole approach to observe the physical processes such as the acceleration, emission, and propagation of non-thermal energetic particles, etc. So far, more than 100 solar radio telescopes have been built in the world, including solar radiometers, dynamic spectrometers, and radioheliographs. Some of them have been closed after the fulfillment of their primary scientific objectives, or for their malfunctions, and thus replaced by other advanced instruments. At the same time, based on some new technologies and scientific ideas, various kinds of new and much more complicated solar radio telescopes are being constructed by solar radio astronomers and space scientists, such as the American E-OVSA and the solar radio observing system under the framework of Chinese Meridian Project II, etc. When we plan to develop a new solar radio telescope, it is crucial to design the most suitable technical parameters, e.g., the observing frequency range and bandwidth, temporal resolution, frequency resolution, spatial resolution, polarization degree, and dynamic range. Then, how do we select a rational set of these parameters? The long-term observation and study revealed that a large strong solar radio burst is frequently composed of a series of small bursts with different time scales. Among them, the radio spike burst is the smallest one with the shortest lifetime, the narrowest bandwidth, and the smallest source region. Solar radio spikes are considered to be related to a single magnetic energy release process, and can be regarded as an elementary burst in solar flares. It is a basic requirement for the new solar radio telescope to observe and discriminate these solar radio spike bursts, even though the temporal and spatial scales of radio spike bursts actually vary with the observing frequency. This paper presents the scaling laws of the lifetime and bandwidth of solar radio spike bursts with respect to the observing frequency, which provide some constraints for the new solar radio telescopes, and help us to select the rational telescope parameters. Besides, we propose a spectrum-image combination mode as the best observation mode for the next-generation solar radio telescopes with high temporal, spectral, and spatial resolutions, which may have an important significance for revealing the physical essence of the various non-thermal processes in violent solar eruptions.  相似文献   

Global method for stability analysis of anchored slopes     

Tan Zhang  Hong Zheng  Cong Sun 《国际地质力学数值与分析法杂志》2019,43(1):124-137

Based on the global method, an approach is proposed to consider the effect of anchor reinforcement on slope stability, where equilibrium conditions are formulated in terms of the whole slip body. Anchor pre-tension is assumed to be undertaken by the whole slip body instead of individual slices, causing internal force within slope more realistic. Meanwhile, the optimization model for locating the critical slip surface is of weak nonlinearity and easy to solve using the conventional optimization procedures. The effects of anchoring orientation and position are thoroughly investigated, and interesting results are obtained.  相似文献   

An appearance‐preserving simplification method for complex 3D building models     

Jiangfeng She  Xiaoyan Gu  Junzhong Tan  Ming Tong  Chaofan Wang 《Transactions in GIS》2019,23(2):275-293

The simplification of 3D building models to effectively reduce model complexity and improve rendering efficiency is an important component of 3D GIS. To reduce the data volume while preserving the model appearance, this article proposes a novel simplification method for complex 3D building models. Texture discontinuities are addressed by developing a new data model that records the mapping relation between the texture coordinates of each vertex and its neighboring triangles. The surface mesh of the building model is then segmented into regions, guided by topology and appearance. Finally, the mesh segmentation information is used to derive an improved error metric that considers both geometric and texture errors, and the texture coordinates are adjusted after each simplification operation. A series of comparative experiments alongside traditional methods demonstrates that our approach achieves a good balance between geometric fidelity and texture preservation, and produces simplified 3D building models with better visual quality.  相似文献   

Correlation between abnormal trends in the spontaneous fields of tectonic plates and strong seismicities          下载免费PDF全文

Da-Cheng Tan  Jian-Cun Xin 《地震科学（英文版）》2017,30(4):173-181

Tectonic activities, electrical structures, and electromagnetic environments are major factors that affect the stability of spontaneous fields. The method of correlating regional synchronization contrasts(CRSC) can determine the reliability of multi-site data trends or shortimpending anomalies. From 2008 to 2013, there were three strong earthquake cluster periods in the North–South seismic belt that lasted for 8–12 months. By applying the CRSC method to analyze the spontaneous field E_(SP) at 25 sites of the region in the past 6 years, it was discovered that for each strong earthquake cluster period, the E_(SP) strength of credible anomalous trends was present at minimum 30%of the stations. In the southern section of the Tan-Lu fault zone, the E_(SP) at four main geoelectric field stations showed significant anomalous trends after June 2015, which could be associated with the major earthquakes of the East China Sea waters(MS7.2) in November 2015 and Japan's Kyushu island(MS7.3) in April 2016.  相似文献