共查询到20条相似文献,搜索用时 484 毫秒
1.
2.
3.
4.
5.
6.
7.
在系统开展海洋区域地质调查的过程中,荷兰广泛使用了各种地球物理调查方法,并在方法选用、测线部署、资料处理和图件编制等方面有许多独到之处;对中荷两国的做法进行了系统的比较;对今后在我国海洋区域地质调查中如何开展地球物理调查工作提出了建议。 相似文献
8.
9.
一种基于块划分颜色特征的图像检索方法 总被引:2,自引:0,他引:2
针对传统的颜色直方图法只表示颜色的组成,没有包含颜色空间分布信息,提出1种基于块划分颜色特征的图像检索方法。该方法将图像划分成大小相等的子块,提取每一块的颜色信息作为特征矢量。通过特征聚类和编码,图像内容可以表示成为包含空间分布信息的局部颜色特征组合。实验结果证明了该方法的有效性,并与其它方法进行了性能比较。 相似文献
10.
11.
《Estuarine, Coastal and Shelf Science》1986,23(5):595-605
A detailed topographic map of a portion of the North Inlet salt marsh system in South Carolina was constructed from aerial overflights, surveying, and tidal measurements. Water storage curves were computed from both (1) hypsometric considerations, and (2) direct measurements of stream and marsh sheet flow. The shape of the hypsometric curve for the basin suggests an immature marsh, which has not yet reached equilibrium in its development. 相似文献
12.
13.
Fluvial sands host excellent oil and gas reservoirs in various fields throughout the world. However, the lateral heterogeneity of reservoir properties within these reservoirs can be significant and determining the distribution of good reservoirs is a challenge. This study attempts to predict sand distribution within fluvial depositional systems by applying the Continuous Wavelet Transformation technique of spectral decomposition along with full spectrum seismic attributes, to a 3D seismic data set in the Pattani Basin, Gulf of Thailand. Full spectrum seismic attributes such as root mean square and coherency help to effectively map fluvial systems down to certain depth below which imaging is difficult in the intervals of interest in this study. However, continuous wavelet transform used in conjunction with other attributes by applying visualization techniques of transparency and RGB can be used at greater depths to extract from 3D seismic data useful information of fluvial depositional elements. This workflow may help to identify different reservoir compartments within the fluvial systems of the Gulf of Thailand. 相似文献
14.
The accumulation of bathymetric and seismic data on many continental margins has provided valuable new insights into variability of seascape morphology. The present challenge is in finding appropriate manners to characterise that morphology so that variations between areas and between potential influences can be recorded. In this paper, we employ hypsometry (area-elevation analysis) and present parameters derived from 65 hypsometric curves which represent distinct slope-basin shapes, based on data from the central USA Atlantic continental slope. The distinction of morphologic signatures has derived from the statistical moments, such as skewness and kurtosis, in describing the hypsometric curves of the submarine basins. Moreover, basin geometry in planview and network structure, have shown to be remarkably well reflected in the shape of the hypsometric curve. Based on the combined analysis of morphology and submarine processes and scenarios, we propose that concave hypsometry is characteristic of trellis networks that probably initiated by sporadic erosion by sedimentary flows, spilling over the shelf edge. The convex hypsometry that characterises poor- to well- developed dendritic networks, heading at or below the shelf break, is attributed to retrograde erosion and sediment fallout events, respectively. These results present initial step in helping to infer submarine processes from morphology, and provide initial information about the environmental scenarios for areas where the erosional record is unknown. 相似文献
15.
A method is described by which reverberation data gathered on a cardioid array can be processed to produce a 'scatterer map' of an area. Such a map shows the locations of strong seabed scatterers and gives a qualitative estimate of their strength. The method cannot give absolute values for scattering strength but its output is nonetheless useful in describing the locations of strong scatterers in an area. Low-Frequency Active Sonar (LFAS) data gathered on the Malta Plateau are presented and the physical causes of observed strong scatterers are described, along with an assessment of the degree of certainty to which these causes are known. 相似文献
16.
Hongbo Zheng Qin Shao Jie Chen Yangyang Shan Xujia Qin Ji Ma Xiaogang Xu 《海洋学报(英文版)》2022,41(10):171-180
Texture-based visualization method is a common method in the visualization of vector field data. Aiming at adding color mapping to the texture of ocean vector field and solving the ambiguity of vector direction in texture image, a new color texture enhancement algorithm based on the Line Integral Convolution (LIC) for the vector field data is proposed, which combines the HSV color mapping and cumulative distribution function calculation of vector field data. This algorithm can be summarized as follows: firstly, the vector field data is convoluted twice by line integration to get the gray texture image. Secondly, the method of mapping vector data to each component of the HSV color space is established. And then, the vector field data is mapped into HSV color space and converted from HSV to RGB values to get the color image. Thirdly, the cumulative distribution function of the RGB color components of the gray texture image and the color image is constructed to enhance the gray texture and RGB color values. Finally, both the gray texture image and the color image are fused to get the color texture. The experimental results show that the proposed LIC color texture enhancement algorithm is capable of generating a better display of vector field data. Furthermore, the ambiguity of vector direction in the texture images is solved and the direction information of the vector field is expressed more accurately. 相似文献
17.
地震分频技术广泛应用于厚储层研究,砂体边界刻画等领域。分频RGB融合切片技术是一种比较成熟,应用较广的技术。笔者在应用该技术做储层研究过程中,发现该属性对储层含油气具有较好的指示作用,并在开发实践中,对属性显示油气异常区布置调整井,取得较好的油气发现,增强该属性应用于油气检测的信心。地震资料的反射信号与储层含油气性间有诸多未解决的问题,不同学者提出过诸多理论致力于地震资料的直接烃检工作。笔者从波动方程推导出含油气储层高频能量衰减加快,因此可以利用分频振幅能量的差异性来放大油气异常信息。设计正演模型论证储层充填油、气、水时振幅能量差异性以及不同频率下不同流体储层的振幅能量差异,证实含油、气、水层在不同频率下能量特征存在差异,砂体厚度在λ/8~λ/4波长区间段,含油气储层的低频增强,高频衰减特征较为明显。基于此结论,利用低、中、高频体进行RGB融合,结合实钻井的油气信息可以预测含油气潜力区。利用该思路在实际油田生产中,设计1口评价井取得100万m3储量的突破。 相似文献
18.
19.
海洋环境要素客观分析图绘制的若干问题 总被引:2,自引:0,他引:2
根据海洋环境资料空间分布的特点,使用Surfer中三角形线性插值法与样条平滑的组合能够比较准确地绘制单航次数据资料的客观分析图。对于累年多源资料,为了较好地解决海洋环境场的各向异性和资料空间分布不均匀性的问题,在Carter(1987)发展的客观分析统计模型的基础上,采用不同的搜索域进行客观分析,取得了良好效果。另外,Kriging方法用于海洋绘图时,在跃层和锋面处容易出现“鼓肚”现象,不能很好地反映浅海区潮混合导致的均匀层,应用时需加以注意。 相似文献