二维波动方程约束反演的大范围收敛广义脉冲谱方法   总被引：5，自引：3，他引：5       下载免费PDF全文

冯国峰  韩波  刘家琦 《地球物理学报》2003,46(2):265-270

针对二维波动方程，将大范围收敛的同伦 方法引入算子参数识别反演的过程，并结合求解不适定问题的Tikhonov正则化方法，设计了二维波动方程反演的大范围收敛广义脉冲谱方法，并利用测井资料进行了约束反演. 大量 的数值模拟结果以及抗噪实验均表明了方法的有效性.  相似文献   

地震勘探中的炸药震源药量理论与实验分析   总被引：5，自引：1，他引：5  

张智  刘财  邵志刚 《地球物理学进展》2003,18(4):724-728

炸药由于具有良好的脉冲特性及高能量的特点而作为地震勘探中的主要震源，就炸药本身来说，在地震勘探中药量、井深等参数的选取对激发能量和激发频率有很大的影响。为此，本文运用炸药爆炸理论，从炸药作功角度来加以论述，并通过理论和实验分析得出选取一个最佳的药量和井深激发，既能提高炸药作功能力，又能增强激发能量，从而激发强能量的高频震源子波，达到指导野外地震采集和节约经济成本的目的。  相似文献   

禾青井动水位对断层蠕动与慢地震过程的响应初析   总被引：3，自引：1，他引：3  

陈立军 《华南地震》1997,17(2):39-44

以湖南禾青井深井水位观测的异常图象为例进行定性分析，发现动水位观测有可能直接反映出断层的滑动或断层的慢地震过程，前者可能为地下水物理参量的观测与研究提供亲折思路，后者则可能对震源物理学的发展和地震预报水平的提高具有特殊的意义。  相似文献   

SHOULD BESTOW MORE PHYSICAL CONNOTATION ON GRAIN SIZE PARAMETER     

CHEN YingyanAssociate Professor  Institute of Mountain Hazards  Environment  Chinese Academy of Sciences  Chengdu  Sichuan    China 《国际泥沙研究》1997,(3)

1.INTRODUCnONSAn~sizeplaysanimpo~roleinmanyfields,SUChasinndmeDt-laden~ordebrisflow.TheStateofsedimentmovementwhateVertheyaresugunded.jUInpingorbed-loading,isoftencloselyrelatedtOtheirSizes.Thebodyor~forcesbornacaglainareOftendiredproponionedtotheabcorSq~sizeofthisgrain.Thereforesedimentsizeisanimpohalltindextoesedimentcharacteristics.Besides,depositsizeanditsdistributionimplysome~infonnationdepositingfonnationenvironmentandcauseing~hyandgeqlogy.Ina~on.thesizeanditsdistributionareeac…  相似文献   

地震层析成像在水利水电工程地质勘察中的应用   总被引：2，自引：0，他引：2  

田宗勇 《CT理论与应用研究》1997,(3)

水利水电工程地质勘察是水利水电工程建设中的基础工作。地震层析成像技术作为一种新的物探方法，通过工程中孔，碉间地质条件的探测，进而评价大坝建筑物的工程地质条件是一种有效的手段。本文介绍了乌江构皮滩水利枢纽的应用效果。  相似文献   

北京顺义4.0级地震板桥井水位异常特征     

孙天林  王燕群 《地震》1997,17(4):425-428

着重介绍了北京顺义４．０级地震前后板桥井水位的异常特征，并通过对板桥井二次异常的对比分析研究，提出井水位异常时间尺度与震级之间的可能关系。  相似文献   

A STUDY ON TYPHOON MOVEMENT PART Ⅲ:EFFECT OF THE HORIZONTAL MOMENTUM EXCHANGE BETWEEN TYPHOONS AND ENVIRONMENT     

贺海晏  董惠菁 《热带气象学报(英文版)》1997,3(1):1-10

Two semi-asymmetric flow patterns of typhoons are chosen to qualitatively determine the effect of exchange of horizontal momentum between inflow and outflow layers and the environment on the motion of typhoons. The results show that only the asymmetric flow component (residual after azimuthal mean flow has been removed) could cause a net momentum input into or output from a typhoon and therefore contribute to the changes in speed and direction of the typhoon movement. A typhoon with major inflow and/or outflow channels on its right (left) side would tend to accelerate and turn left (decelerate and turn right); On the other hand, a typhoon with major inflow and/or outflow channels in the rear (front) semicircle would tend to accelerate and turn right (decelerate and turn left).  相似文献   

岩溶发育区供水井施工工艺          下载免费PDF全文

刘广才 《探矿工程》1997,(4):51-52

分析了岩溶区供水井施工困难的原因，并从钻井、成井工艺方面就防治地面塌陷和克服井孔弯曲、坍塌、延长供水井寿命等问题进行了探讨。  相似文献   

电镀PDC石油全面钻头及其在油气田中的应用          下载免费PDF全文

胡三虎 《探矿工程》1997,(1):45-46

采用低温电镀工艺生产ＰＤＣ石油全面钻头对金刚石无任何热损伤，对喷咀进行组合设计，在两口井中进行试验，取得了很好的经济效益和社会效益，并分析了钻头的特点及存在的问题。  相似文献   

Recovering magnetic susceptibility from electromagnetic data over a one-dimensional earth   总被引：1，自引：0，他引：1  

Zhiyi Zhang  Douglas W. Oldenburg 《Geophysical Journal International》1997,130(2):422-434

While the inversion of electromagnetic data to recover electrical conductivity has received much attention, the inversion of those data to recover magnetic susceptibility has not been fully studied. In this paper we invert frequency-domain electromagnetic (EM) data from a horizontal coplanar system to recover a 1-D distribution of magnetic susceptibility under the assumption that the electrical conductivity is known. The inversion is carried out by dividing the earth into layers of constant susceptibility and minimizing an objective function of the susceptibility subject to fitting the data. An adjoint Green's function solution is used in the calculation of sensitivities, and it is apparent that the sensitivity problem is driven by three sources. One of the sources is the scaled electric field in the layer of interest, and the other two, related to effective magnetic charges, are located at the upper and lower boundaries of the layer. These charges give rise to a frequency-independent term in the sensitivities. Because different frequencies penetrate to different depths in the earth, the EM data contain inherent information about the depth distribution of susceptibility. This contrasts with static field measurements, which can be reproduced by a surface layer of magnetization. We illustrate the effectiveness of the inversion algorithm on synthetic and field data and show also the importance of knowing the background conductivity. In practical circumstances, where there is no a priori information about conductivity distribution, a simultaneous inversion of EM data to recover both electrical conductivity and susceptibility will be required.  相似文献