Monitoring the land subsidence with persistent scatterer interferometry in Nansha District,Guangdong, China   总被引：1，自引：1，他引：0  

Minsi Ao  Changcheng Wang  Rongan Xie  Xingqing Zhang  Jun Hu  Yanan Du  Zhiwei Li  Jianjun Zhu  Wujiao Dai  Cuilin Kuang 《Natural Hazards》2015,75(3):2947-2964

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Spatiotemporal variation of meteorological droughts based on the daily comprehensive drought index in the Haihe River basin,China   总被引：4，自引：0，他引：4  

Jun He  Xiao-Hua Yang  Jian-Qiang Li  Ju-Liang Jin  Yi-Ming Wei  Xiao-Juan Chen 《Natural Hazards》2015,75(2):199-217

Meteorological droughts can affect large areas and may have serious environmental, social and economic impacts. These impacts depend on the severity, duration, and spatial extent of the precipitation deficit and the socioeconomic vulnerability of the affected regions. This paper examines the spatiotemporal variation of meteorological droughts in the Haihe River basin. Meteorological droughts events were diagnosed using daily meteorological data from 44 stations by calculating a comprehensive drought index (CI) for the period 1961–2011. Based on the daily CI values of each station over the past 50 years, the drought processes at each station were confirmed, and the severity, duration and frequency of each meteorological drought event were computed and analyzed. The results suggest the following conclusions: (1) the use of the CI index can effectively trace the development of drought and can also identify the duration and severity of each drought event; (2) the average drought duration was 57–85 days in each region of the Haihe River basin, and the region with the highest average values of drought duration and drought severity was Bohai Bay; (3) drought occurred more than 48 times over the study period, which is more than 0.95 times per year over the 50 years studied. The average frequencies of non-drought days, severe drought days and extreme drought days over the study period were 51.2, 3.2 and 0.4 %, respectively. Severe drought events mainly occurred in the south branch of the Hai River, and extreme drought events mainly occurred in the Shandong Peninsula and Bohai Bay; (4) the annual precipitation and potential evapotranspiration of the Haihe River basin show decreasing trends over the past 50 years. The frequency of severe drought and extreme drought events has increased in the past 20 years than during the period 1961–1990. The results of this study may serve as a reference point for decision regarding basin water resources management, ecological recovery and drought hazard vulnerability analysis.  相似文献   

Provincial evaluation of vulnerability to geological disaster in China and its influencing factors: a three-stage DEA-based analysis   总被引：1，自引：0，他引：1  

Mingze Li  Jun Lv  Xin Chen  Nan Jiang 《Natural Hazards》2015,79(3):1649-1662

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额尔齐斯碰撞带东段结构与形成时代   总被引：2，自引：1，他引：1  

洪涛  相鹏  游军  张连昌  吴楚  吴琪  徐兴旺 《岩石学报》2015,31(2):571-593

阿尔泰地体与萨吾尔岛弧之间的额尔齐斯碰撞带其结构与形成时代是中亚造山带构造演化研究的热点问题之一。本文报道了额尔齐斯碰撞带东段结构与形成时代的研究结果。新的结果显示:额尔齐斯碰撞带东段由4个走向NWNNW陡立的韧性变形带组成,剖面上呈扇状挤压变形的结构;这4个韧性变形带的应变类型为收缩应变与平面应变;片理带的变形从宏观到微观都表现出对称的结构,不同变形带不同地段可具变化的流动方向而表现出"奶油饼结构",其可能整体形成于共轴挤压机制;玉勒肯与老山口韧性变形带花岗闪长质糜棱岩、花岗闪长质超糜棱岩中变质重结晶锆石U-Pb定年结果显示韧性变形时间约为360Ma。这可能意味着早石炭世时卡拉先格尔地区已进入碰撞阶段,即萨吾尔岛弧与阿尔泰地体间在360Ma时已发生碰撞。  相似文献   

基于模式识别理论的卡钻类型判别分析          下载免费PDF全文

吴军  臧艳彬  陈星星 《探矿工程》2015,42(10):31-34

将模式识别理论中的支持向量机、Bayes判别分析以及多元回归分析应用于卡钻类型判别分析,建立了基于模式识别理论的卡钻判别模型。以近几年川东北卡钻数据为例进行了算例分析,结果表明：采用支持向量机、Bayes判别法及多元回归法对卡钻类型判别的结果与实际结果的误判率分别为1.92%,11.52%,61.54%。支持向量机（SVM）判别结果精度最高,但其判别方程式较为复杂,不能直观看出各分量对结果的影响程度;多元回归分析判别方程形式简单,可以直观表达各参量与卡钻之间的密切程度,但其判别精度较低;Bayes判别法计算精度介于二者之间,但其判别精度与判别式的个数密切相关。  相似文献   

扶余油田注水开发过程中储层非均质性动态演化特征     

刘之的  康鹏兴  王军  于红果  徐静 《地质科技情报》2015,(1):123-130

研究油田注水开发过程中储层非均质性的动态演化特征,对于查明剩余油分布规律意义重大。扶余油田已进入高含水期,综合含水率已超过90%。为了科学有效地开发该油藏,调动剩余油潜力,有必要针对储层的宏观和微观非均质性进行深入细致的研究。选取不同含水期密闭取心井的物性、薄片、电镜、压汞及粒度等分析化验资料,通过详实对比分析储层不同含水期的物性和非均质性变化特征,得到了储层高含水期非均质性相关参数的动态演化规律。研究表明,扶余油田储层非均质性随含水率上升而逐渐减弱,呈现出由低含水期的中孔、中渗储层向高含水期的中高孔、中高渗储层演化趋势;注水开发对孔隙半径影响较小;储层碎屑颗粒在低含水期以接触式为主,中高含水期转变为孔隙-接触式、接触-孔隙式接触,高含水期以孔隙式接触为主。  相似文献   

The Palaeoclimate and Microscopic Reservoir Characteristics of Shanxi Formation Shales from Lower Permian in Qinshui Basin     

HUANG Junping  YANG Zhanlong  CHEN Qilin  DI Jun  BAI Yunlai  LI Zhiyong  and HUANG Chenggang 《《地质学报》英文版》2015,89(Z1):41-44

<正>1 Introduction Qinshui Basin is the major coal bearing basin in China.And the main exploration target layer is CarboniferousPermian.In recent years,not only in the coal-bed methane has made great progress,and also in the tight gas.Besides,shale gas in the Carboniferous-Permian has showed a good exploration prospect.Although Carboniferous-  相似文献   

Petroleum Accumulation: from Continuous to Discontinuous     

ZHAO Jingzhou  CAO Qing  BAI Yubin  ER Chuang  LI Jun  WU Weitao  and SHEN Wuxian 《《地质学报》英文版》2015,89(Z1):303-306

<正>1 Introduction Petroleum accumulations from the Earth’s crust can be grouped into conventional and unconventional ones.The history of the world’s petroleum exploration is a history from the exploration of conventional accumulations to that of unconventional ones.Nevertheless,petroleum accumulation is actually a contrary process starting from  相似文献   

Recent Activity of the Badu-Longwei Segment, Guguan-Xiangong Fault in Southern Liupanshan, Constrained by Rhythmic Sediment Lithology and Geomorphic Characteristics     

SHI Zhigang  YUAN Daoyang  HE Wengui  LIU Xingwang  WANG Jun 《《地质学报》英文版》2015,89(4):1165-1175

This study's objective was to investigate the Guguan-Xiangong Fault, which lies in the southern Liupanshan area, through satellite image interpretation and field observations. Guguan-Xiangong Fault is divided into five subsegments; among these, the Badu-Longwei segment has been the most recently active. The geomorphic features of the Badu-Longwei segment are clearly displayed, including multiple high fault scarps with fresh bedrock free faces. There is significant evidence for Holocene activity of the three fault sections, located in Renhuashu, Tianjiagou, and Xinjiecun respectively. The three sections feature distinct episodic deposition and fault scratches. Based on 14 Cdating and field observations on the three fault sections, two or more paleoearthquakes across the Badu-Longwei fault segment are ascertained, between 5874±116 and 5430±140 a BP, and after 2037±83 a BP respectively. The Badu-Longwei segment of the Guguan-Xiangong Fault is preliminarily extrapolated as the seismogenic structure of the 600 A.D. Qin-Long earthquake.  相似文献   

The Geological Characteristics of Chengkou Type Shale Gas of Lower Cambrian in Dabashan     

YE Jun  LIU bin  WANG Sheng  YU Ping  CHENG Jing 《《地质学报》英文版》2015,89(Z1):294-296

<正>1 Introduction After the successful implementation of large-scale shale gas exploration、development and utilization in United States,the domestic shale gas exploration and development is in a rapid development.However,the progress of exploration and understanding of the highEvolution shale gas in the complex structure zone of the outer basin are relatively slow,the evaluation method and  相似文献