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901.
As an important reservoir type in the Bohai Bay Basin, China, lacustrine beach and bar sands which refer to the shallow water complex deposited mainly by nearshore, delta‐rim and buried hill‐related beaches as well as longshore bars were developed in a particular stage in the evolution of those faulted Cenozoic continental depressions. In the Chezhen Depression, for example, the Second Member of the Oligocene Shehejie Formation (abbr. as Es2 hereafter) formed during the rifting‐to‐thermal subsidence transitional stage. Although well developed in Es2, beach and bar sands are difficult to recognize owing to their relative thinness. The paper summarizes sedimentary characteristics of lacustrine beach and bar sands on cores and logs. Low‐angle cross‐stratification, swash stratification, as well as occasional small‐scale hummocky cross‐stratification resulted from storms can be observed in beach and bar sands. The paper distinguishes bars and beaches from each other in Es2 mainly based on the grain‐size, bed thickness, facies succession and log responses. In order to predict the distribution of beach and bars, a chrono‐stratigraphic correlation framework of Es2 in the study strata is established using a high‐resolution sequence stratigraphic approach. Es2 strata are sub‐divided into six medium‐scale cycles and the mapping of the high‐frequency cycles allows the geographic and stratigraphic distribution of both beach and bar sands to be predicted. The study shows that beach and bars are better developed in times of base‐level fall than in base‐level rise. Factors such as lake‐level fluctuation, sediment supply, palaeogeomorphology and palaeowind direction have exerted control on the formation and distribution of beach and bar sands. Finally, the genetic pattern of beach and bar sands in the Es2 unit has been constructed, which provides a foundation for the prediction of beach and bars reservoir in continental basins in general. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
902.
随着海洋战略地位的逐步提高,深远海海底资源开发和海洋工程建设将面临巨大挑战,主要是受限于技术手段,高精度调查资料难以获取,无法全面准确地进行海底稳定性评价.针对这一问题,本文提出了基于微地貌特征的深远海海底稳定性评价方法.基于已有的研究工作,本文选取西太平洋菲律宾海中南部某区域为研究区,利用ArcGIS平台建立研究区D... 相似文献
903.
904.
1980-2010年西藏波密地区典型冰川变化特征及其对气候变化的响应 总被引:4,自引:3,他引:1
运用遥感(RS)与地理信息系统(GIS)技术, 结合波密县1960-2010年气象数据, 分析了西藏波密地区冰川的主要分布特征和典型大冰川1980-2010年的时空变化. 结果显示: 波密县共有冰川数量2 040条, 总面积为4 382.5 km2, 其中, 分布在海拔4 000~6 000 m的高山冰川总面积达4 086 km2, 占冰川总面积的93.2%; 南坡分布冰川1 504条, 面积3 180.04 km2, 分别占波密冰川总量的73.73%和72.56%, 而北坡占还不到三分之一. 提取1980、 1990、 2000和2010年4期面积大于20 km2的24条大冰川面积进行对比分析, 1980-2010年间波密县大冰川面积总体呈减小趋势, 由1980年的1 592.78 km2退缩至2010年1 567.04 km2, 共退缩了25.74 km2; 其中, 1980-1990年冰川变化贡献最大, 冰川面积退缩了16.62 km2, 占冰川总面积退缩量的64.6%. 波密县气象站数据显示, 50 a来冰川退缩主要受温度持续上升的影响, 降水量变化对冰川变化影响不大. 相似文献
905.
906.
???ü???GNSS????10??????????????????GPS????????????????????????仯???μ????????仯???????????????????????????仯????????????????????????????????С?????????м?????????п??????Ч????????????????????????????????????????????? 相似文献
907.
根据1951-2010年珠江流域23个典型断面流量资料,用P-III型分布曲线拟合洪水系列进行频率计算,分析了珠江流域极端洪水事件的变化趋势。结果表明:1980年以来,珠江流域极端洪水事件发生的频次明显增加,尤其是自1990年以来增加趋势显著;1981-2010年较1951-1980年珠江流域约70%典型断面极端洪水事件呈增加趋势,主要分布在西江、北江、粤西;而近30%的典型断面呈减少趋势,主要分布在东江和桂南。 相似文献
908.
The optimization inversion method based on derivatives is an important inversion technique in seismic data processing, where
the key problem is how to compute the Jacobian matrix. The computational precision of the Jacobian matrix directly influences
the success of the optimization inversion method. Currently, most of the AVO (amplitude versus offset) inversions are based
on approximate expressions for the Zoeppritz equations to obtain the derivatives of the seismic wave reflection coefficients
(SWRCs) with respect to the stratum parameters. As a result, the computational precision and range of applications of these
AVO inversions are restricted undesirably. In order to improve the computational precision and to extend the range of applications
of AVO inversions, the partial derivative equations of the Zoeppritz equations are established, with respect to the ratios
of wave velocities and medium densities. By solving the partial derivative equations of the Zoeppritz equations accurately,
we obtained the partial derivative of SWRCs with respect to the ratios of seismic wave velocities and medium densities. With
the help of the chain rule for derivatives, the gradient of the SWRCs can be accurately computed. To better understand the
behavior of the gradient of the SWRCs, we plotted the partial derivative curves of the SWRCs, analyzed the characteristics
of these curves, and gained some new insight into the derivatives. Because only a linear system of equations is solved in
our method without adding any new restrictions, the new computational method has both high precision and a quick running speed;
it is not only suitable for small incident angles and weak reflection seismic waves but also for large incident angles and
strong reflection seismic waves. With the theoretical foundations established in the article, we can further study inversion
problems for layered stratum structures and we can further improve the computational speed and precision of the inversions. 相似文献
909.
910.
南京基准地震台与中国地震台网测定体波震级对比分析 总被引:2,自引:2,他引:0
以中国地震台网测定的综合体波震级为标准震级,采用正交回归方法,得到南京测震台(NJ2)体波震级与标准体波震级之间的关系式,并对震级偏差与震级大小、震中方位和震中距关系进行偏差分析,为台站分析人员提供指导. 相似文献