准噶尔盆地车莫古隆起内物源沉积体系探讨及勘探意义——以白垩系清水河组一段为例   总被引：1，自引：0，他引：1       下载免费PDF全文

侯连华  王京红  匡立春  况军  张光亚  刘磊 《地学前缘》2009,16(6):337

为了探讨车莫古隆起对内物源沉积体系及油气成藏的控制作用,从车莫古隆起形成与演化入手,利用岩心、地震、测井等资料,多种方法结合恢复其剥蚀量、古地貌,提出车莫古隆起从中侏罗世到早白垩世发育,侏罗世末是其鼎盛时期,并提供内物源,控制围绕车莫古隆起周缘沉积体系和砂体展布,从岩心、地震特征、重矿物稳定系数、古水流指向、砂岩厚度等方面给出存在依据,合理解释了古隆起控制范围内已发现油藏的砂体成因。车莫古隆起发育和潜伏埋藏期控制古油气藏的形成与分布,掀斜后内物源砂体展布、断裂体系和现今构造共同控制着油气调整、运移及次生油气藏的分布,围绕车莫古隆起发育的内物源砂体尖灭方向与现今构造高部位指向垂直和斜交区域是岩性地层油气藏有利区。围绕内物源勘探刚开始,在此认识指导下部署的沙门1、莫17、夏盐11、夏盐12等井已获得突破,腹部岩性地层油气藏勘探将进入一个油气发现新阶段。  相似文献   

核电站前期建设工程项目中的综合防雷技术与应用     

匡本贺 《湖北气象》2006,(2):31-34

根据湖北省防雷中心对我国已建核电站前期工程中雷击灾害所作的调查及分析,指出了核电厂选址的基本要求与防雷之间的关系;概述了核电厂厂址专用气象观测站建设项目及设备布设情况;重点从直击雷防护、地网建设、弱电设备雷电防护这三方面对核电站前期建设工程项目中防雷系统建设进行了探讨;最后,联系实际,简要分析了核电厂前期工程综合防雷的效果。  相似文献   

新丰江库区上地壳三维细结构层析成像   总被引：5，自引：2，他引：3       下载免费PDF全文

杨卓欣  刘宝峰  王勤彩  赵翠萍  陈章立  张先康 《地球物理学报》2013,56(4):1177-1189

在新丰江库区布设一个范围约50 km×40 km、由50个地震临时台站组成的观测台阵,接收来自不同方位的人工震源产生的莫霍界面反射波;台阵中的20个台站和5个区域固定台还对2009年3月至2010年5月发生在库区的地方震进行了观测.本文联合利用人工地震莫霍面反射波走时和天然地震直达波走时,采用连续模型反演技术重建了库区上地壳P波、S波慢度扰动和V_p/V_s扰动分布图像.研究结果表明:新丰江库区东、西部地区上地壳结构存在明显的差异.库区东部地区构造复杂,多条断裂在该区呈交叉状分布.北西向的石角-新港-白田断裂带在库区段内具有复杂的岩性和构造特征,该断裂带在新港至双塘一线可能延伸至地下8 km左右;近北东向的断裂带切割地壳较深.峡谷区及大坝以东附近地区存在上、下贯通的波速比高值区,尤其是大坝以西的深水峡谷区,存在一条顺河走向的陡倾角断层裂隙带,为库水渗透提供了良好通道.库区西部地区为相对稳定构造区,完整坚硬的花岗岩体透水性能较差,受库水渗透影响很小.新丰江水库诱发地震的形成与深部构造环境密切相关.峡谷区及大坝以东附近地区上地壳介质性质呈现明显的横向不均匀性,微震分布在介质物性结构的特定部位,"软"、"硬"交错的介质环境是倾滑正断层型微小震产生的可能原因.  相似文献   

安徽省庐枞盆地黄屯硫铁矿床地质特征及控矿因素分析   总被引：1，自引：0，他引：1  

张冠华  张矿  何德锋 《安徽地质》2012,(4):251-255

黄屯硫铁矿位于庐枞中生代火山岩盆地的北东部边缘,矿体主要赋存于盖层龙门院组火山岩系与基底沉积地层接触部位的不整合面及其附近,成矿与次火山活动关系密切,属于次火山-热液矿床,成矿作用主要为热液充填交代方式。  相似文献   

冀西北尚义上侏罗统—下白垩统后城组恐龙足迹新发现及生物古地理意义^*   总被引：2，自引：0，他引：2       下载免费PDF全文

柳永清  旷红伟  彭楠  许欢  陈军  徐加林  刘海  章朋 《古地理学报》2012,14(5):617-627

简要报道了新近首次在冀西北张家口尚义地区发现的恐龙足迹。野外地质调查发现,恐龙足迹赋存于尚义晚中生代盆地侏罗系—白垩系后城组顶部。恐龙行迹呈近东西向展布,由数十个足迹构成。初步研究表明,造迹者分别属于兽脚类和蜥脚类恐龙,由西向东行进。足迹中包括兽脚类足迹70余个,组成数个行迹;蜥脚类足迹15个,构成1列行迹。蜥脚类足迹特征显示其可能属于游泳状的行迹。华北北部土城子组/后城组发育于燕辽生物群—热河生物群更替演化时期（晚侏罗世—早白垩世早期）,以往在该时期沉积物中罕见脊椎动物骨骼化石。近年来华北北部土城子组/后城组中频繁发现的恐龙足迹表明,燕辽生物群—热河生物群更替演化时期发育着以恐龙为代表的脊椎动物群。该发现将有助于进一步了解土城子组/后城组沉积时期恐龙属种的多样性及其生物古地理环境。晚侏罗世—早白垩世早期沉积古地理和古生态环境及其与恐龙动物群发育的研究有助于揭示陆地生物群更替演化和环境的关系。  相似文献   

Forced response of the East Asian summer rainfall over the past millennium: results from a coupled model simulation   总被引：1，自引：0，他引：1  

Jian Liu  Bin Wang  Hongli Wang  Xueyuan Kuang  Ruyuan Ti 《Climate Dynamics》2011,36(1-2):323-336

The centennial?Cmillennial variation of the East Asian summer monsoon (EASM) precipitation over the past 1000?years was investigated through the analysis of a millennium simulation of the coupled ECHO-G model. The model results indicate that the centennial?Cmillennial variation of the EASM is essentially a forced response to the external radiative forcing (insolation, volcanic aerosol, and green house gases). The strength of the response depends on latitude; and the spatial structure of the centennial?Cmillennial variation differs from the interannual variability that arises primarily from the internal feedback processes within the climate system. On millennial time scale, the extratropical and subtropical precipitation was generally strong during Medieval Warm Period (MWP) and weak during Little Ice Age (LIA). The tropical rainfall is insensitive to the effective solar radiation forcing (insolation plus radiative effect of volcanic aerosols) but significantly responds to the modern anthropogenic radiative forcing. On centennial time scale, the variation of the extratropical and subtropical rainfall also tends to follow the effective solar radiation forcing closely. The forced response features in-phase rainfall variability between the extratropics and subtropics, which is in contrast to the anti-correlation on the interannual time scale. Further, the behavior of the interannual?Cdecadal variation in the extratropics is effectively modulated by change of the mean states on the millennial time scale, suggesting that the structure of the internal mode may vary with significant changes in the external forcing. These findings imply that on the millennial time scale, (a) the proxy data in the extratropical EA may more sensitively reflect the EASM rainfall variations, and (b) the Meiyu and the northern China rainfall provide a consistent measure for the EASM strength.  相似文献   

Numerical study of the barotropic responses to a rapidly moving typhoon in the East China Sea   总被引：2，自引：1，他引：1  

Yang Ding  Huaming Yu  Xianwen Bao  Liang Kuang  Caixia Wang  Wenjuan Wang 《Ocean Dynamics》2011,61(9):1237-1259

Barotropic responses of the East China Sea to typhoon KOMPASU are investigated using a high-resolution, three-dimensional, primitive equation, and finite volume coastal ocean model. Even the fact that the typhoon KOMPASU only brushed across the brink of China mainland without landing, it still imposed great influence across China's east coastal area, where storm surges ranging from 35 to 70 cm were intrigued during this event and a large wake of water setdown due to the outward radial transport driven by the cyclonic wind stress was generated after the KOMPASU traveled across the Yellow Sea. Analysis of the numerical results reveals that the barotropic waves propagating along the coast after the typhoon's landing can be identified as Kelvin wave and the currents associated with the storm are geostrophic currents. A series of model runs are initiated to diagnose the effects of wind stress, atmospheric pressure, and storm track variation on the surge's spatial distribution in the East China Sea. The barotropic waves affected by the atmospheric disturbance due to the typhoon in deep Pacific Ocean travel far more rapidly, arriving at the coastal regions at least 60 h ahead of the typhoon. The wave amplitudes are merely 0.2–0.4 cm and damp gradually due to friction. The model experiments also confirm that the surge levels in nearshore regions are highly dominated by winds, whereas the water level variations in deeper areas are controlled by the atmospheric pressure forcing during typhoon events in the East China Sea.  相似文献   

2008年春季中国南方冰雪冻害林木折损分析     

邵全琴  黄麟  刘纪远  匡文慧  李佳 《地理学报(英文版)》2011,21(2):219-234

An abrupt ice and snow storm disaster which occurred in the spring of 2008 se-verely destroyed forests over a surprisingly large portion of southern China.A transect crossing Jinggang Mountain-Jitai Basin-Yushan Mountain-Wuyi Mountain was selected as the study area.The authors integrated field data collected in two field surveys to analyze the impacts of the disturbance on forests.The following results were obtained.(1) The extent of damage to plantations along the transect decreased in the order of slash pine > masson pine > mixed plantation > Chinese fir.Slash pine is an introduced species from southern America which is characterized by fast growth,low wood quality and rich oleoresin,and showed a damage rate of 61.3% of samples,of which 70.4% cannot recover naturally.Masson pine is the native pioneer species of forests with harder wood,and 52.5% were damaged due to turpentine,of which 60.9% cannot recovery naturally.Chinese fir is a local tree species and samples showed a rate of 46% and a relative rate of 32.5%,lower than the mixed plantation.(2) From west to east along the transect,we can see that evergreen broad-leaved forest of the western transect on Jinggang Mountain showed the lightest damage extent,and a Cryp-tomeria plantation at an altitude of 700 m was severely destroyed while Chinese fir showed light damage below 700 m and relatively severe damage above 900 m.Masson pine and slash pine in the central transect in Jitai Basin were damaged severely due to turpentine ac-tivities,and closed natural secondary deciduous broad-leaved forest was damaged severely due to high ice and snow accumulation on intertwined shrubs.Masson pine aerial-seeding plantations below 400 m along the eastern transect in Xingguo and Ningdu counties were nearly undamaged for small tree sizes,and Chinese fir at 500-900 m altitude showed a lighter damage extent.However,masson pine which was distributed above 400 m and planted in the 1960s,was severely damaged due to turpentine.  相似文献   

矩形基坑涌水量计算方法研究     

旷南树  张建军  曹文文 《岩土工程技术》2013,(5):230-233

通过对矩形基坑渗流模型的理论研究及实践分析,以达西定律及裘布依假定为理论依据,推导了潜水完整矩形基坑涌水量的计算方法。并通过工程实例,分析了本文计算方法、大井法、瀑布法适用的基坑涌水量计算类型,认为本文计算方法更适合于长宽比较大时矩形基坑涌水量的计算。  相似文献   

GPS资料同化中一种快速优化算法     

KUANG Zheng  WANG Bin  YANG Hualin 《大气科学进展》2003,20(3):437-441

GPS资料同化最终归结为一个大规模的无约束优化问题。由于问题的维数很高，使得寻找到一种快速且节约存储的优化算法成为GPS资料同化能否满足在业务数值天气预报上的要求的关键。提出了一种新的优化算法。该方法把L-BFGS和HFN两种方法动态的结合起来，同时利用有限差分技术和截去技术，使算法在存储和计算量适合当前设备的前提下，较大的提高了算法的收敛速度。数值试验表明，该方法的计算效率与L-BFGS方法相比有十分明显的改善。  相似文献