古水深曲线在测井资料层序地层分析中的应用

层序地层学的精华就是综合应用露头、钻测井和地震资料进行层序地层分析。因此,在缺乏以陆上暴露不整合面为特征的层序界面的湖相沉积中,如何应用测井资料进行层序划分就成为层序地层学研究中一个重要环节。本文以柴达木盆地金达 1井第四系为例,介绍了一种综合利用岩芯、岩屑和电测曲线等测井资料,通过相对古水深曲线的建立,来进行层序地层分析的快速简便的方法。     

海底地形的识别与水深的综合

水深综合是数字海图综合的重要方面,也是其难点之一,在分析水深综合原则的基础上,提出了基于地形特征识别的综合模型,以分解其诸多约束条件,来实现水深的自动综合。     

埕岛海域水深地形特征及冲淤规律探讨

介绍了埕岛海域水深及地形特征,简述了埕岛海域经历的快速冲刷、缓慢冲刷及冲淤调整的３个阶段,探讨了位于局部高部位、平坦海底及过渡地带３种井场的冲淤规律。     

塔河油田奥陶系走滑断裂体系特征及成因机制

塔河油田奥陶系“断溶体”油藏是塔里木盆地油气勘探开发的重要对象。本文对塔河油田10区西、于奇西、于奇8井三块三维地震资料开展了精细的走滑断裂构造解析,并在此基础上对塔河油田走滑断裂体系的形成演化过程与成因机制有新认识。研究结果表明：(1)除了在塔河油田南部10区西、托普台等区块发育典型的“X”型共轭走滑断裂体系外,首次发现塔河油田北部于奇地区发育非对称式共轭走滑断裂体系,据此划分出塔河油田南、北两大走滑断裂体系,但两者在形成时间、最大主应力方向、动力学来源等方面均存在明显差异;(2)两大走滑断裂体系的形成及演化过程大致分为3个阶段：加里东期中期I幕形成南部NNE、NNW两组走向的“X”型共轭走滑断裂体系,最大主压应力方向为N3°E,主要受到西昆仑洋俯冲消减作用产生的由S向N的挤压应力;加里东期晚期—海西期早期形成北部以近NE走向为主、少量SN走向组成的非对称式共轭走滑断裂体系,最大主压应力方向为N23°E,主要受到南天山洋俯冲消减作用产生的由N向S的挤压应力,海西期晚期继承性活动,主应力方向保持不变;印支期—燕山期两大走滑断裂体系继承性活动,最大主压应力方向为N37°E,主要受到南部古...     

基于GF5-AHSI数据的新"三边参数"浅海水深反演

以上海市横沙滩涂浅水区为研究区域,利用GF5-AHSI高光谱遥感数据和同时期水深数据,通过新"三边参数"方法和相关分析提取建模因子,基于最优标度回归方法建立该区域的水深反演模型,并进行精度验证.研究发现:检验样本的决定系数达到了0.885,均方根误差为0.80 m,模型精度和可靠性较高,可以用于横沙浅水区水深反演.     

基于二分搜索的水深数据与遥感影像匹配算法

研究了遥感水深反演的数据匹配方法,分析了插值加密法与最短距离法的优缺点。针对高分辨率卫星影像海量数据,传统匹配方法无法有效进行数据匹配问题,提出基于二分搜索的阈值距离法。实验表明,新算法的匹配效率与匹配精度得到了显著提高,有助于获得更好的水深反演效果。     

Construction of lake bathymetry from MODIS satellite data and GIS from 2003 to 2011

In recent years, sedimentation conditions in Dongting Lake have varied greatly because of significant changes in runoff and sediment load in the Changjiang （Yangtze） River following the construction of Three Gorges Dam. The topography of the lake bottom has changed rapidly because of the intense exchange of water and sediment between the lake and the Changjiang River. However, time series information on lake-bottom topographic change is lacking. In this study, we introduced a method that combines remote sensing data and in situ water level data to extract a record of Dongting Lake bottom topography from 2003 to 2011. Multi-temporal lake land/water boundaries were extracted from MODIS images using the linear spectral mixture model method. The elevation of water/land boundary points were calculated using water level data and spatial interpolation techniques. Digital elevation models of Dongting Lake bottom topography in different periods were then constructed with the multiple heighted waterlines. The mean root-mean-square error of the linear spectral mixture model was 0.036, and the mean predicted error for elevation interpolation was -0.19 m. Compared with field measurement data and sediment load data, the method has proven to be most applicable. The results show that the topography of the bottom of Dongting Lake has exhibited uneven erosion and deposition in terms of time and space over the last nine years. Moreover, lake-bottom topography has undergone a slight erosion trend within this period, with 58.2% and 41.8% of the lake-bottom area being eroded and deposited, respectively.     

Optimal Design of Equivalent Water Depth Truncated Mooring System Based on Baton Pattern Simulated Annealing Algorithm简

The highest similarity degree of static characteristics including both horizontal and vertical restoring force-displacement characteristics of total mooring system, as well as the tension-displacement characteristics of the representative single mooring line between the truncated and full depth system are obtained by annealing simulation algorithm for hybrid discrete variables （ASFHDV, in short）. A“baton” optimization approach is proposed by utilizing ASFHDV. After each baton of optimization, if a few dimensional variables reach the upper or lower limit, the boundary of certain dimensional variables shall be expanded. In consideration of the experimental requirements, the length of the upper mooring line should not be smaller than 8 m, and the diameter of the anchor chain on the bottom should be larger than 0.03 m. A 100000 t turret mooring FPSO in the water depth of 304 m, with the truncated water depth being 76 m, is taken as an example of equivalent water depth truncated mooring system optimal design and calculation, and is performed to obtain the conformation parameters of the truncated mooring system. The numerical results indicate that the present truncated mooring system design is successful and effective.