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地殻物性の異方性と弾性波動現象に関する地球工学的研究

地壳性质各向异性与弹性波现象的地球工程研究

基本信息

批准号：
04452265
负责人：
ROKUGAWA Shuichi
金额：
$ 4.35万
依托单位：
University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04452265/
关键词：
Inversion Cross-well reflection S wave tomography AVO Transmission wave Anisotropy Reflection amplitude 透過波 ART法回折トモグラフィ

项目摘要

This project is a well-based exploration work. In the diffraction tomography, the extraction technique of the scattering wave field was developed by the usage of ray-path tomogram results. In this process, the reference traces that represent the direct wave field are precisely extracted from the observed data. Next, the radar tomography was applied to the diorite dominant area. Both velocity and attenuation coefficient were calculated through the correction of instrument direction sensitivity. Finally, dielectric constant and poisson ratio were derived from this analysis. This results demonstrated the effectiveness of radar tomography for mapping underground water paths. In field experiments, diffraction and ray-path tomography were applied to the fracture dominant field, Tanna area in Shiauoka prefecture. The velocity distribution was derived from each method respectively. As the results, ray-path method proved to be useful, but the problem of wave field separation still remained in dffraction tomography. In the final stage of this research, a cross-well seismic reflection method was prosposed to mapping reflection events between wells. Preliminary results indicate the effective of the method. One of the key technique for this method is a diffraction stacking method with the detailed velocity analysis.

本项目是一项有井基础的勘探工作。在衍射层析成像中，利用射线路径层析成像的结果，开发了散射波场的提取技术。在此过程中，从观测数据中精确地提取出代表直达波场的参考道。其次，对闪长岩优势区进行雷达层析成像。通过对仪器方向灵敏度的修正，计算速度系数和衰减系数。最后推导出介质常数和泊松比。这一结果证明了雷达层析成像在地下水路径测绘中的有效性。在现场实验中，将衍射和射线路径层析成像技术应用于小冈县田那地区的裂缝优势场。分别推导了两种方法的速度分布。结果表明，射线路径法是有用的，但衍射层析成像中仍然存在波场分离问题。在研究的最后阶段，提出了井间地震反射方法来绘制井间反射事件。初步结果表明了该方法的有效性。该方法的关键技术之一是具有详细速度分析的衍射叠加法。