电法在地下热水勘探中的应用   总被引：3，自引：0，他引：3  

郑东明  叶松青  成建勋  游君君 《世界地质》2005,24(1):77-81

为进一步开发和利用热水镇的地热资源,运用物探联合剖面法,结合区域地质和构造特征,分析、推断地下热水形成和运移的水文地质条件;推测出隐伏的断裂带;证实张性断裂对地下热水的控制作用;查明该区第四系中视电阻率<40 Ω·m的地层为含热水砂砾石层,圈定联剖曲线低阻带中视电阻率<100 Ω·m的范围为断裂构造脉状地下热水的中心部位。  相似文献   

A nested pre-operational model for the Egyptian shelf zone: Model configuration and validation/calibration     

《Dynamics of Atmospheres and Oceans》2017

We explored the variability of the Egyptian shelf zone circulation connected to atmospheric forcing by means of a numerical simulation of the general circulation. A high resolution model grid was used at 1/60° horizontal resolution and 25 sigma layers. The simulation was carried out using the most recent version of the Princeton Ocean Model (POM). The initialised model was run the whole year of 2006 using the analysis forcing data for the same year obtained from ECMWF and MFS (Mediterranean Forecasting System, Pinardi et al., 2003). The model skills were evaluated by means of the root mean square error (RMSE) and correlations. The Egyptian Shelf Model (EGYSHM) simulation suggests the presence of an Egyptian Shelf Slope Current (ESSC), which is flowing eastward at different depths in the domain. We found that the maximum velocity of the ESSC [0.25 m/s] is located near the continental slope during the summer time, while in winter the velocity of ESSC is weaker [0.12 m/s] in the same location. The ESSC appears to be directly affected by Mersa-Matruh gyre system. EGYSHM reproduced the main region circulation patterns, especially after adding the Nile River outflow. We found that wind stress is crucial to force the circulation of the Egyptian shelf zone. EGYSHM SST was significantly correlated to satellite SST in all months at a 95% confidence limit, with a maximum of 0.9743 which was obtained in May 2006. The RMSE between EGYSHM and Argo floats salinity data was about 0.09. We compared our results with satellite altimetry to verify the positions and shapes of mesoscale features.  相似文献   

Seasonal variability of sonic layer depth in the Central Arabian Sea     

TVS Udaya Bhaskar  Debadatta Swain  M Ravichandran 《Ocean Science Journal》2008,43(3):147-152

The seasonal variability of sonic layer depth (SLD) in the central Arabian Sea (CAS) (0 to 25°N and 62-66°E) was studied using the temperature and salinity (T/S) profiles from Argo floats for the years 2002–2006. The atmospheric forcing responsible for the observed changes was explored using the meteorological data from NCEP/NCAR and Quickscat winds. SLD was obtained from sound velocity profiles computed from T/S data. Net heat flux and wind forcing regulated SLD in the CAS. Up-welling and down-welling (Ekman dynamics) associated with the Findlater Jet controlled SLD during the summer monsoon. While in winter monsoon, cooling and convective mixing regulated SLD in the study region. Weak winds, high insolation and positive net heat flux lead to the formation of thin, warm and stratified sonic layer during pre and post summer monsoon periods, respectively.  相似文献   

深海氮气浮标运动特性分析     

陈丹峰  邹一麟  曾铮  魏照宇  姚宝恒  连琏 《海洋工程》2019,37(2):112-119

氮气浮标是一种新型的剖面浮标,通过增加蓄能器作为被动浮力调节模块,可以利用海洋压差实现更有效率的剖面运动。由于蓄能器的加入,氮气浮标的运动特性相对于常规浮标有所变化。基于一款深海剖面浮标,利用理论分析和运动仿真的方法研究了氮气浮标的运动特性,对氮气浮标主动体积改变量与剖面运动深度之间的对应关系、氮气浮标的剖面运动形式以及氮气浮标的定深悬浮稳定性进行研究。研究表明,氮气浮标只需要主动对浮标体积做较小的改变即可完成同等深度的剖面运动,节省了浮标完成一次剖面运动的能量消耗。但蓄能器的引入增加了浮标完成剖面运动需要的时间,且给浮标的运动带来了突变性和不稳定性。  相似文献   

长江中下游成矿带及邻区地壳结构——MASH成矿过程的P波接收函数成像证据？   总被引：12，自引：0，他引：12  

史大年  吕庆田  徐文艺  严加永  赵金花  董树文  常印佛 《地质学报》2012,86(3):389-399

利用长江中下游成矿带多学科深部探测剖面于2009年11月至2011年3月间采集的天然地震数据,通过天然地震接收函数成像等分析研究,得到了研究区地壳和上地幔结构的清晰图像。接收函数成像结果显示研究区内Moho面深度存在着明显的起伏变化,在长江中下游成矿带(指剖面穿过的长江中下游成矿带宁芜矿集区,下同)下方存在着"幔隆构造"。在剖面东南端(即扬子克拉通北缘),Moho面相对稳定,深度约为30km;在茅山和江南断裂附近,Moho面存在上下起伏现象;在剖面中部或宁芜矿集区下方,Moho面存在明显隆起,深度只有28km;在郯庐断裂带下方,Moho面明显加深,深度达到36km;进一步向北到华北地台南缘,Moho面深度逐渐恢复到了32km左右的平均深度水平。其次,我们在接收函数成像结果中发现,长江中下游成矿带与其周边下地壳结构存在着明显的差异,成矿带的下地壳具有显著的地震波方位各向异性。扬子克拉通北缘的下地壳呈高速的近水平状结构,地震波各向异性特征不明显;与此相比,长江中下游成矿带的下地壳虽然也呈近水平状结构特征,但是,对于沿成矿带走向方向传播的地震波,其下地壳具有高速特征,而对于垂直于成矿带走向方向上传播的地震波,其下地壳却又表现为低速特征,这意味着成矿带的下地壳存在着平行于成矿带走向(即近北东—南西)方向的地震波各向异性,我们解释其是下地壳熔融并沿成矿带走向水平流动导致矿物晶体定向排列的结果。最后,在郯庐断裂以西的华北地台南缘观测到一条从上地壳延伸到中下地壳的南南东向倾斜的转换震相,我们推测它可能是合肥盆地内地壳伸展构造的反映。此外,我们发现接收函数成像结果中观测到的"幔隆构造"与远震P波层析成像结果在成矿带下方150km深度上显示的上地幔低速异常(江国明等,另文发表)存在着良好的对应关系,我们解释它们是软流圈物质上涌的遗迹。综合天然地震接收函数成像、远震P波层析成像和前人关于岩浆岩等方面的研究成果,我们认为长江中下游成矿带现今的下地壳可能是中生代发生成矿作用的多级岩浆房系统的一部分,成矿带的形成可能是类似MASH过程的产物。首先,软流圈物质上涌导致了长江中下游成矿带及其周边拉张环境的形成,在其上部地壳中形成了一系列伸展构造;然后,软流圈物质通过底侵进入长江中下游成矿带的原下地壳并与原下地壳物质发生同化作用,形成类埃达克质岩浆;接着,类埃达克质岩浆沿着伸展、拆离构造上升到地壳浅部形成不同层次的岩浆房和侵入岩体,并与围岩作用形成矿床。  相似文献   

虾夷扇贝Smad基因家族的鉴定及表达分析     

潘好远  戴晓婷  胡乃娜  曾启繁 《中国海洋大学学报(自然科学版)》2021,(3)

Smad基因介导的细胞信号在调节动物发育和细胞干性方面起着至关重要的作用。由于其功能的多样性和重要性,Smad基因家族一直受到广泛的研究。然而,双壳贝类Smad基因家族缺乏系统的鉴定和分析。为了理解双壳贝类Smad基因家族的进化和生物学功能,本文在虾夷扇贝基因组鉴定出4个Smad基因,并对其遗传和表达特征进行了分析。时空表达谱显示,Smad3基因在虾夷扇贝受精卵和2~8细胞时期有较高的表达量,而在胚胎及幼虫阶段该基因表达量迅速降低,推测其在胚胎早期细胞分裂和分化过程中发挥重要作用。Smad6在胚胎发育早期表达量较低,在囊胚期及原肠胚时期表达量显著升高,可能与母源调控向合子型调控过渡的“中期囊胚转换”有关。Smads基因在各组织中也呈现了独特的表达模式,其中Smad3、Smad5和Smad6分别在肌肉、血细胞和鳃中表达量最高。而Smad4在各个组织内均有表达且表达量相似。实验结果暗示了Smad基因在虾夷扇贝中不仅参与协调了早期胚胎的发育,也与组织器官的形成和稳态有关。本研究有助于理解贝类Smad基因的进化及功能,为深入研究该基因家族在贝类中的生物学功能和调控机制奠定基础。  相似文献   

渤海湾西部浅海区活牡蛎礁调查结果及资源保护建议     

范昌福  裴艳东  田立柱 《地质通报》2010,29(5):660-667

采用旁侧声呐、浅地层剖面仪和单波束水深测量多种物探仪器联机,同步调查天津大神堂浅海区的水下活牡蛎礁资源,为合理保护活牡蛎礁资源提供科学依据。调查结果表明,该区活牡蛎资源由3个分散礁体组成,总面积仅约3km2,礁体最大厚度1.2m,平均厚度0.6m;调查区海底地形平坦,水深介于3.4~5.6m之间,因受人类活动严重破坏,仅在有礁体发育的局部范围内有高程约1m的起伏波动。为了生态资源的完整,必须对现存的活牡蛎礁体进行保护和恢复。  相似文献   

电阻率剖面法探测深度的研究     

霍军廷  吴信民  李乃民 《物探化探计算技术》2011,33(4):418-423,348

在考虑了异常体的形态、异常体和围岩的电性差异、供电极和接收极测量误差、供电电流误差、仪器测量精度,以及外界干扰等因素的基础上,提出了用电位异常来描述电阻率剖面法中探测深度的定义。通过编程,计算得到各向同性均匀半空间中球体异常,在电阻率剖面法中的电位异常,得出在特定条件下的探测深度。定量分析了联合剖面法中探测深度与电极距AO、供电电流和外界干扰的关系。制作并完成了软件的各种正演计算,可以为电阻率剖面法野外施工前的电极距大小、供电电流的设计等提供参考。  相似文献   

Crustal structure of the Paleozoic Kunlun orogeny from an active-source seismic profile between Moba and Guide in East Tibet, China   总被引：13，自引：0，他引：13  

Zhongjie Zhang  Simon Klemperer  Zhiming Bai  Yun Chen  Jiwen Teng 《Gondwana Research》2011,19(4):994-1007

We herein present a new seismic refraction/wide-angle reflection profile that crosses the Songpan–Ganzi terrane, the Animaqing suture zone and the eastern Kunlun mountains (comprised of the South Kunlun and Middle Kunlun blocks separated by the Middle Kunlun fault). The profile is 380 km long and extends from Moba to Guide in eastern Tibet. The crustal thickness is about 62 km under the Songpan–Ganzi terrane, 62–64 km under the South Kunlun, and 60 km under the Middle Kunlun block. The Songpan–Ganzi flysch seems to be present up to a depth of 15 km south of the Animaqing suture zone, and up to a depth of 10 km in the Middle Kunlun block, with thicknesses elsewhere that depend on assumptions about the likely lithologies. The profile exhibits clear lateral variations both in the upper and lower crust, which are indicative of different crustal blocks juxtaposed by the Kunlun fault system. Whether or not the Songpan–Ganzi flysch was originally deposited on oceanic crust, at the longitude of our profile (100°E) it is now underlain by continental crust, and the presence of continental crust beneath the Songpan–Ganzi terrane and of a continental arc under the South Kunlun block suggest Paleozoic continent–continent arc collision in the eastern Kunlun Mountains. Comparison of crustal velocity columns from all wide-angle seismic profiles across the eastern Kunlun mountains indicates a remarkable west-to-east change in the Moho topography across the Kunlun fault system (15–20 km Moho step at 95°E, but only 2–5 km along our profile at 100°E). Lower-crustal thickness of the Kunlun terranes is rather uniform, about 35 km, from 80°–95°E, which suggests that similar thrust-thickening processes have played a role where the Qaidam Basin abuts the Kunlun fault, but thins to 20–25 km at 100°E, east of the Qaidam Basin. The increased crustal thickness from 93° to 98°E compared to that at 100°E may be due to the differences in the thickness of the crust of the two plates before their collision, and/or largely achieved by thickening of the lower crust, perhaps indicating a crustal flow mechanism operating more strongly in the western region.  相似文献   

Argo浮标自动稳压泵站     

张文良 《海洋技术学报》2011,30(3):32-34

Argo浮标是靠浮标体底部一个可改变体积的盛油皮囊,使其获得不同的净浮力来实现下潜、上升和深度控制.盛油皮囊的膨胀和收缩又是通过液压柱塞泵向盛油皮囊内注入或抽出液压油来实现的,以液压柱塞泵为主的浮标注油系统的运转状况关系到整个Argo浮标的性能.因此,为了提高Argo浮标的工作可靠性,在Argo浮标的生产制作及其检测过...  相似文献