庆阳-合水地区长8油层组沉积物源分析     

杨梦辉  刘广锋  童明均  杨伟伟 《地下水》2015,(2)

物源分析对砂岩储层的展布与分析预测具有重要的意义。通过对鄂尔多斯盆地西南缘庆阳-合水地区上三叠统延长组长8油层组的砂岩重矿物组合、轻矿物组合及砂岩岩屑组分的平面分布特征分析,判断了庆阳-合水地区的沉积物源方向。研究表明,庆阳-合水地区存在两大物源和古流沉积体系,即西南方向的庆阳沉积古流体系和南部方向的合水沉积古流体系;长82亚组沉积期以南部的沉积古流体系为主,而长81亚组沉积期以西南部的沉积古流体系为主;重矿物组合特征分析显示长81亚组沉积期合水区带混源现象明显。  相似文献   

三峡库区曾家棚滑坡变形特征与成因机制分析   总被引：1，自引：0，他引：1  

伏永朋  吴吉民  王树丰  闫举生  李明 《华南地质与矿产》2015,(1)

2012年6月,三峡库区大溪河曾家棚发生滑坡,该滑坡在库水位变动和暴雨共同作用下发生,其发生发展过程及形成模式在三峡库区具有典型代表性。通过对比曾家棚滑坡以往勘查测绘资料和本次滑动变形实测及调查结果,对该滑坡影响因素和成因机制进行了分析,并提出了其发展变化演化过程,预测了其发展变化趋势及危害性,可为库区相似岸坡稳定性分析及监测预警提供借鉴。  相似文献   

碳酸盐岩洞穴型储层地震综合预测——以塔里木盆地古城低凸起三维区为例     

李毓丰  顾乔元  徐彦龙  钱玲  李新生  余和中  吴建国  席勤  徐永丽 《海相油气地质》2015,(2):72-78

塔里木盆地古城低凸起三维地震工区内的奥陶系碳酸盐岩埋藏深,非均质性强,且无钻井资料。重点对奥陶系鹰山组三段—四段白云岩的串珠状地震反射体进行地质诠释。采用均方根振幅属性预测了储层平面分布规律,应用缝洞雕刻技术预测了裂缝和串珠体发育区,运用相干、曲率属性预测了断裂、裂缝的分布,联合应用频率衰减梯度、低频能量、平均频率和吸收系数等手段进行了油气检测。通过对多种信息的综合分析,评价优选出有利勘探目标。基于上述工作部署的A井,在鹰山组三段灰质白云岩储层中获天然气勘探重大突破,证实了地震综合预测方法的有效性。  相似文献   

Comparative application of two mathematical models to predict sedimentation in Yermasoyia Reservoir,Cyprus     

V. Hrissanthou 《水文研究》2006,20(18):3939-3952

The Yermasoyia Reservoir is located northeast of the town of Limassol, Cyprus. The storage capacity of the reservoir is 13·6 × 10⁶ m³. The basin area of the Yermasoyia River, which feeds the reservoir, totals 122·5 km². This study aims to estimate the mean annual deposition amount in the reservoir, which originates from the corresponding basin. For the estimate of the mean annual sediment inflow into the reservoir, two mathematical models are used alternatively. Each model consists of three submodels: a rainfall‐runoff submodel, a soil erosion submodel and a sediment transport submodel for streams. In the first model, the potential evapotranspiration is estimated for the rainfall‐runoff submodel, and the soil erosion submodel of Schmidt and the sediment transport submodel of Yang are used. In the second model, the actual evapotranspiration is estimated for the rainfall‐runoff submodel, and the soil erosion submodel of Poesen and the sediment transport submodel of Van Rijn are used. The deposition amount in the reservoir is estimated by means of the diagram of Brune, which delivers the trap efficiency of the reservoir. Daily rainfall data from three rainfall stations, and daily values of air temperature, relative air humidity and sunlight hours from a meteorological station for four years (1986–89) were available. The computed annual runoff volumes and mean annual soil erosion rate are compared with the respective measurement data. Copyright © 2006 John Wiley & Sons, Ltd.  相似文献   

EVOLUTION　OF　RAPIDS　OF　CREEK　MOUTH－BAR　AT　GEZHOUBA　RESERVOIR　AND　THE　IMPACTS　ON　NAVIGABLE　CHANNEL　IN　THE　UPPER　REACHES　OF　THE　CHANGJIANG　RIVER     

林承坤  高锡珍 《中国地理科学(英文版)》1996,6(3):223-230

ＥＶＯＬＵＴＩＯＮＯＦＲＡＰＩＤＳＯＦＣＲＥＥＫＭＯＵＴＨ－ＢＡＲＡＴＧＥＺＨＯＵＢＡＲＥＳＥＲＶＯＩＲＡＮＤＴＨＥＩＭＰＡＣＴＳＯＮＮＡＶＩＧＡＢＬＥＣＨＡＮＮＥＬＩＮＴＨＥＵＰＰＥＲＲＥＡＣＨＥＳＯＦＴＨＥＣＨＡＮＧＪＩＡＮＧＲＩＶＥＲ￥ＬｉｎＣ...  相似文献   

贵州三板溪水库诱发地震活动特征分析     

曾新平  王梅 《大地测量与地球动力学》2007,27(Z1):19-23

研究了贵州省三板溪水库蓄水前后的地震活动特征与地震成因类型, 认为三板溪水库蓄水后出现的地震成因类型可划分为水库诱发构造型和地壳表层卸荷型。  相似文献   

三峡库区地质灾害防减灾战略关键问题   总被引：6，自引：0，他引：6  

文海家  张永兴  柳源 《中国地质灾害与防治学报》2004,15(2):22-28

三峡库区地质灾害防治已成为目前中国地质灾害防治的主战场。论文主要分析三峡库区地质灾害防治工作中面临的主要问题及防、减灾战略实施中的一系列关键问题。先概要介绍了库区地质灾害种类繁多、量大面广、日趋严重的现状;然后从库区人为诱发地质灾害愈演愈烈的状况、地质灾害基础调查工作在广度与深度方面的不足、地质灾害防治资金投入有限等方面对目前该区地质灾害防治面临的主要问题进行了研究;其后重点从库区地质灾害防治总体规划的形成历程与实施、地质灾害的科学管理制度的建立与多体系管理体制的理顺、地质灾害的预测预报研究与成果转化及库区地质灾害全面监测预警体系的建立、治理地质灾害采用的整治与利用相结合的技术措施等方面,深入分析了实施库区地质灾害防、减灾战略的一些关键问题。结论认为,呈日趋严重之势的库区地质灾害,难以在水库最终建成蓄水之前实施全面治理,防、减灾战略的关键是要尽快实施库区地质灾害总体防治规划,并且在总体防治规划的指导下,在科学的地质灾害管理制度及顺畅的管理体制下,开展库区地质灾害预测预报工作及全面实施监测预警。同时实施重点整治与土地利用相结合的治灾技术路线。  相似文献   

Projection of Water Availability in the Miyun Watershed from an RCM Simulation          下载免费PDF全文

SHI Ying  GAO Xue-Jie 《大气和海洋科学快报》2012,5(6):468-472

Based on a high-resolution regional climate model (RegCM3) simulation over East Asia, future climate changes over the Miyun Reservoir in the 21st century under the Intergovernmental Panel on Climate Change (IPCC) Special Report on Emissions Scenarios (SRES) A1B scenario are analyzed. The model simulation extends from 1951 to 2100 at a grid spacing of 25 km and is one-way nested within a global model of MIROC3.2_ hires (the Model for Interdisciplinary Research on Climate). The focus of the analysis is on the Watershed of Miyun Reservoir, the main water supply for Beijing in northern China. The results show that RegCM3 reproduces the observed temperature well but it overestimates precipitation over the region. Significant warming in the 21st century is simulated in the annual mean, December-January-February (DJF) and June-July-August (JJA), although with differences concerning the spatial distribution and magnitude. Changes in precipitation for the annual mean, DJF, and JJA also show differences. A prevailing increase of precipitation in DJF and a decrease of it in JJA is projected over the region, while little change in the annual mean is projected. Changes of the difference between precipitation and evapotranspiration to measure the potential water availability are also presented in the paper.  相似文献   

水库流域体积降水量预报方法研究     

罗森波  张东  舒锋敏  黄焕坤 《气象研究与应用》2009,30(1):4-7

根据广东飞来峡水库流域汇流特征,将全流域划分为5个支流,并采用求积仪分别计算各支流面积;然后用加权平均法计算各支流的面雨量,并将各支流面雨量对相应的支流面积进行积分,计算各支流体积降雨量;利用洪水过程飞来峡水库入库流量、出库流量和水库流域蒸发量对体积降水量预报结果进行验证,求出误差订正系数.结果表明:利用加权平均法计算的水库流域体积降水量,经过误差订正后,预报准确率可控制在90%左右,基本满足预报业务服务要求.  相似文献   

Mechanism of the Anlesi landslide in the Three Gorges Reservoir, China   总被引：5，自引：0，他引：5  

Wenxing Jian  Zhijian Wang  Kunlong Yin 《Engineering Geology》2009,108(1-2):86-95

Many gentle dip translational rock slides have taken place in the Three Gorges Reservoir, China. In order to study the mechanism of these translational rock slides, the authors use the Anlesi landslide as a typical case study to investigate in detail. Field investigations show that the slip zones of the Anlesi landslide were formed from a white mudstone in Jurassic red strata. X-ray diffraction and infrared ray analysis showed that the main mineral components of the slip zones are montmorillonite, illite, feldspar and quartz. Laboratory tests indicate that the slip zone soils are silty clay, of medium-swelling potential, the shear strength decreasing significantly as the slip zone attracts water and saturates.The main factors contributing to the Anlesi landslide are recent tectonic activity, incompetent beds, and intensive rainfall. Recent tectonic activity had caused shear failure along the incompetent beds, and joints within the sandstone. With the effect of intensive rainfall, water percolates to the incompetent beds along tectonic fissures, resulting in swelling of the soil material and high groundwater pressures within fissures in the strata. As a consequence, the Anlesi slope is prone to slide along these incompetent beds.Flac3D software was used to simulate the mechanism of the Anlesi landslide considering the rheological properties of soil and rock. The simulation results demonstrate that the stress, displacement and failure area changes with simulated creep time. The maximum displacement in the X direction reaches 7.59 m after 200-year simulated creep. Therefore, the mechanism of the Anlesi landslide can be illustrated considering the rheological properties of Jurassic red strata.  相似文献