用同相叠加方法识别定点形变数据中的降雨影响     

杨学慧  常玉巧  李燕玲  应骁睿  杨海鹏  崔庆谷 《大地测量与地球动力学》2016,36(10):936-940

分别以昆明台、云龙台为例,用数据同相位叠加的方法分别对形变数据中的典型图像及其对应时段的降雨数据进行叠加,以判断典型图像是否与降雨有关。结果表明,昆明台形变观测中多次出现的同步转折为降雨影响;而云龙台的转折现象则与降雨无关,其来源及属性需要进一步研究。  相似文献   

Development of time series stacks of Landsat images for reconstructing forest disturbance history     

《International Journal of Digital Earth》2013,6(3):195-218

Abstract

Forest dynamics is highly relevant to a broad range of earth science studies, many of which have geographic coverage ranging from regional to global scales. While the temporally dense Landsat acquisitions available in many regions provide a unique opportunity for understanding forest disturbance history dating back to 1972, large quantities of Landsat images will need to be analysed for studies at regional to global scales. This will not only require effective change detection algorithms, but also highly automated, high level preprocessing capabilities to produce images with subpixel geolocation accuracies and best achievable radiometric consistency, a status called imagery-ready-to-use (IRU). This paper describes a streamlined approach for producing IRU quality Landsat time series stacks (LTSS). This approach consists of an image selection protocol, high level preprocessing algorithms and IRU quality verification procedures. The high level preprocessing algorithms include updated radiometric calibration and atmospheric correction for calculating surface reflectance and precision registration and orthorectification routines for improving geolocation accuracy. These automated routines have been implemented in the Landsat Ecosystem Disturbance Adaptive System (LEDAPS) designed for processing large quantities of Landsat images. Some characteristics of the LTSS developed using this approach are discussed.  相似文献   

Kirchhoff型高保真反偏移理论     

孙建国 《西安地质学院学报》2011,(2):207-212,216

为了使Kirchhoff型反偏移的输出结果与数值模拟结果相等,提出了一种旨在消除Kirchhoff型反偏移中所出现的振幅畸变现象的高保真反偏移方法。与常规的Kirchhoff型反偏移不同,高保真反偏移是一种与反射面有关的反射地震成像方法。因此,在高保真反偏移中首先要确定反射面的位置,其次要确定振幅畸变因子的数值,最后要根据在反射点上振幅畸变因子恒等于1这一事实进行振幅畸变校正。在具体实施过程中,为了求出反射点的空间位置和振幅畸变因子的具体数值,采用四重加权叠加法,即在一次反偏移运算中同时采用一个单位加权函数和三个非单位加权函数。其中,非单位加权函数由常规的真振幅加权函数和用于建立Kircohhoff型反偏移算子的全局坐标系中的水平坐标组成。通过在四个反偏移场之间进行比值运算,可以达到提取反射点坐标和振幅畸变因子的目的。一旦得到反射点坐标和振幅畸变因子的具体数值,就可以通过简单的除法消除掉振幅畸变因子对反偏移像场振幅的影响。  相似文献   

Kirchhoff型高保真反偏移理论     

孙建国 《地球科学与环境学报》2011,33(2):207-212,216

为了使Kirchhoff型反偏移的输出结果与数值模拟结果相等,提出了一种旨在消除Kirchhoff型反偏移中所出现的振幅畸变现象的高保真反偏移方法。与常规的Kirchhoff型反偏移不同,高保真反偏移是一种与反射面有关的反射地震成像方法。因此,在高保真反偏移中首先要确定反射面的位置,其次要确定振幅畸变因子的数值,最后要根据在反射点上振幅畸变因子恒等于1这一事实进行振幅畸变校正。在具体实施过程中,为了求出反射点的空间位置和振幅畸变因子的具体数值,采用四重加权叠加法,即在一次反偏移运算中同时采用一个单位加权函数和三个非单位加权函数。其中,非单位加权函数由常规的真振幅加权函数和用于建立Kircohhoff型反偏移算子的全局坐标系中的水平坐标组成。通过在四个反偏移场之间进行比值运算,可以达到提取反射点坐标和振幅畸变因子的目的。一旦得到反射点坐标和振幅畸变因子的具体数值,就可以通过简单的除法消除掉振幅畸变因子对反偏移像场振幅的影响。  相似文献   

共反射面元叠加技术在南海北部莺—琼盆地中的应用     

袁全社  李列  柴继堂  邓勇  李振春 《海洋地质前沿》2011,(10)

随着莺—琼盆地油气勘探开发的不断深入,2 700m以下的中深层地震资料品质迫切需要提高,而改善信噪比提高成像质量则是需要深入研究的重点内容之一。基于共反射面元(CRS)叠加在改善中深层地震资料信噪比方面具有理论和技术应用优势,由于考虑了反射层的局部特征和第一菲涅耳带内的全部反射,对复杂地质问题的适应性得以增强,真正实现了高信噪比叠加,从而改善中深层低信噪比区的成像质量。通过理论研究分析、模型试处理及莺—琼盆地实际地震资料处理中具体的应用与试验,取得了明显的效果,即该区中深层地震资料信噪比显著增强,大大提高了解释的可靠程度。总之,共反射面元叠加技术在莺—琼盆地具有较高的推广应用价值。  相似文献   

低信噪比转换波地震资料静校正(英文)   总被引：1，自引：0，他引：1  

李国发  彭苏萍 《应用地球物理》2008,5(1):44-49

Converted waves have slow velocity and low signal-to-noise ratio. It is also difficult to pick first-breaks and bin the common-conversion-points （CCP）. Some statics methods, which work well for P-wave data, can＇t be effectively used for solving convertedwave statics problems. This has become the main obstacle to breakthroughs in convertedwave data processing. To improve converted-wave static corrections, first, a statics method based on the common-receiver-point （CRP） stack is used for the initial receiver static correction to enhance the coherency of the CRP stack. Second, a stack-power-maximization static correction which improves the continuity of the CCP stack is used for detailed receiver statics. Finally, a non-surface-consistent residual moveout correction of the CCP gathers is used to enhance the stack power of reflection signals from different depths. Converted-wave statics are solved by the joint use of the three correction methods.  相似文献   

中国西部复杂地区地震资料处理   总被引：8，自引：2，他引：6  

屈智华  叶秋焱  刘旺 《物探与化探》2000,24(1):43-50

针对戈壁、沙丘地区地震资料的特点,通过对原始资料进行质量控制、高通滤波、倾角滤波、野外静校正、地表一致性反褶积、精细速度分析、叠前去噪、剩余静校正多次迭代、叠后去噪和偏后修饰等处理,提高了低信噪比地区地震剖面的资料质量,摸索出了一套戈壁、山前、沙丘等复杂地区地震资料处理技术。通过对青海、新疆地区资料进行实际应用,证明该资料处理技术实用可靠,效果显着。  相似文献   

基于局部倾斜叠加的快速射线束叠前时间偏移          下载免费PDF全文

陈祥忠  岳玉波  王瑞兴  刘俊成  惠梦琳 《地球物理学报》2020,63(4):1585-1590

宽方位高密度地震勘探可以有效的提高地震资料的空间分辨率和裂缝预测的精度,但地震道数的增加也大幅度提升了地震数据的处理成本.为提高海量地震数据偏移处理的计算效率,本文发展了一种快速射线束叠前时间偏移方法.该方法首先根据给定的射线束中心间隔将炮记录划分为一系列数据子集,然后利用倾斜叠加将数据子集分解为不同方向的平面波,最后根据射线束中心到地下成像点的双程走时和射线参数拾取相应的平面波振幅累加到成像点上.同Kirchhoff叠前时间偏移相比,本文方法不但保持了一致的成像精度,且由于仅需在稀疏的射线束中心位置进行成像累加运算,计算效率得到了大幅度的提升.文中所给出的模型和实际资料的测试结果验证了本文方法的正确性和有效性.  相似文献   

综合物探在东罗（坑口）火电厂灰渣堆置场勘察中的应用     

陈礼堂  邓龙波 《南方国土资源》1996,(3)

东罗火电厂灰渣堆置场的选址，以场地堆置灰渣后是否对客兰水库造成污染为前提。广西地质测井中心利用综合物探方法对场地的水文地质、工程地质和环境地质进行勘察评价。经工作，圈定了第四系土层和七条岩溶发育带，确定了一正断层位置，在四个钻孔中充电确定了地下水的流速和流向（主要为北西向和正北方向）。最后认为，场地堆置弃渣后，对位于南南东方向的客兰水库没有造成污染，为选址决策和施工设计提供了依据  相似文献   

New insights into the crustal structure of the North German Basin from reprocessing of seismic reflection data using the Common Reflection Surface stack   总被引：1，自引：0，他引：1  

Mi-Kyung Yoon  Mikhail Baykulov  Stefan Dümmong  Heinz-Jürgen Brink  Dirk Gajewski 《International Journal of Earth Sciences》2008,97(5):887-898

The influence of deep crustal processes on basin formation and evolution and its relation to current morphology is not well understood yet. A key feature to unravel these issues is a detailed seismic image of the crust. A part of the data recorded by the hydrocarbon industry in the late 1970s and 1980s in the North German Basin were released to the public recently. The seismic reflection data were recorded down to 15 s two-way travel time. The mean Common Midpoint fold of about 20 is relatively low compared to contemporary seismic acquisitions. The processing of the 1980s focussed on the sedimentary structures to explore the hydrocarbon potential of this area. We applied the Common Reflection Surface stack technique to the data sets, which is well suited for low-fold data. The reprocessing was focussed on the imaging of the subsedimentary crustal range. The reprocessed images show enhanced reflections, especially in the mid and lower crustal part. Also, the image of the salt structures in the graben area was improved. Furthermore, the reprocessed images indicate an almost flat Moho topography in the area of the Glückstadt Graben and an additional lower crustal structure, which can be correlated with a high-density body found in recent gravity modeling studies.  相似文献