Stress measurements around earthquake fault and shallow subduction zone using core samples retrieved from deep boreholes

使用从深钻孔取回的岩心样本测量地震断层和浅俯冲带周围的应力

• 批准号: 16540392
• 负责人: LIN Weiren
• 金额: $ 1.86万
• 依托单位: Japan Agency for Marine-Earth Science and Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16540392/
• 关键词: In-situ stress; Stress measurement; Core-based method; Earthquake fault; Subduction zone; Deep drilling; Anelastic strain recovery method; ASR; チェルンプ断層; ブレークアウト; 手法間の比較; 跡津川断層; 地震発生; 活断層; 科学掘削; TCDP

Objectives of this study are, i) to examine whether core-based methods, especially the anelastic strain recovery (ASR) method, can be applied for determining the in-situ stress in cases of deep ocean drilling such as the coming "The Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE)" at great depths, and ii) to understand basic features of stress distribution in the vicinity of an active fault by means of application the stress measurements on a scientific drilling project, Taiwan Chelungpu-fault Drilling Project (TCDP).First, we analyzed three-dimensional in-situ stress by using anelastic strains measured in six independent directions of oriented cores which were taken from a 5,000 m-depth continental drilling project. For all the core samples measured, the expansional anelastic strains were obtained ; and the strain values in various directions was sufficiently high for the accuracy of the measurement system used. Then, these strains were successfully used for a three-dimensiona … More l analysis of the directions of three principal stresses and estimation of the magnitudes of the stresses. As second case study, in order to understand the feature of rock stress change at different depths above, within, and beneath the Chelungpu fault after the Chi-Chi earthquake, we employed the three-dimensional ASR method to determine current stress using drill core samples retrieved from TCDP. Acquired anelastic strains were of high quality ; and the strain data could be used for three-dimensional analysis resulting in the determination of directions and the estimation of magnitudes of the principal stresses. Preliminary results showed that the directions of principal stresses changed between the shallower depth above the fault and the deeper depth beneath it, that is, the current stress distribution in the TCDP hole might be influenced by the Chelungpu-fault rupture. Consequently, it can be said that the ASR method is well suited for use in directly determining the directions of principal stresses in three dimensions and in estimating their magnitude in isotropic rocks at large/great depths. Less

本研究的目的是：1）检验基于岩心的方法，特别是滞弹性应变恢复（ASR）方法，是否可以应用于深海钻探（如即将进行的“南海海槽地震孕育带实验”）中的地应力测量”在很深的地方，（2）通过科学钻探工程中应力测量的应用，了解活动断层附近应力分布的基本特征，台湾车笼埔断层钻探计画（TCDP）：首先，我们利用取自5，000公尺深大陆钻探计画之定向岩心，在六个独立方向上量测的滞弹性应变，分析三维地应力。对于所测量的所有岩心样品，获得了膨胀滞弹性应变;并且对于所使用的测量系统的准确性，在各个方向上的应变值足够高。然后，这些菌株被成功地用于三维 ...更多信息 分析了三个主应力的方向，估算了应力大小。作为第二个案例研究，为了了解集集地震后车笼埔断层上、内、下不同深度的岩石应力变化特征，我们采用三维ASR方法，利用从TCDP获得的岩心样品确定当前应力。所获得的滞弹性应变是高质量的;应变数据可用于三维分析，从而确定方向和估计主应力的大小。初步结果显示，断层上方浅部与下方深部主应力方向有变化，即车笼埔断层破裂可能影响了TCDP孔现今应力分布。因此，可以说，ASR方法非常适合用于直接确定三维主应力的方向，并在大/大深度的各向同性岩石中估计其大小。少

项目成果

Proceedings of the ISRM Symposium EUROCK 2005

ISRM 研讨会 EUROCK 2005 论文集

• 发表时间: 2005
• 作者: W.Lin;M.Kwasniewski;K.Matsuki;M.Takahashi;Y.Oikawa
• 通讯作者: Y.Oikawa

Comparisons between three-dimensional in-situ stresses determined by anelastic strain recovery and differential strain curve analysis methods

滞弹性应变恢复法与微分应变曲线分析法测定三维地应力的比较

• 发表时间: 2006
• 期刊: Proceedings of the International Symposium on In Situ Rock Stress (Taylor ＆ Francis Group, ISBN 0 415 40163 1)
• 作者: Weiren Lin;et al.
• 通讯作者: et al.

Comparisons between three-dimensional in-situ stresses determined by anelastic strain recovery and differential strain curve analysis methods, In : Proceedings of the International Symposium on In Situ Rock Stress (Eds : M.Lu, C.Li, H.Kjoholt, and H.Dahle

由滞弹性应变恢复和微分应变曲线分析方法确定的三维地应力的比较，载于：国际原地岩石应力研讨会论文集（编辑：M.Lu、C.Li、H.Kjoholt 和 H）

• 发表时间: 2006
• 作者: W.Lin;Y.Oikawa;T.Imamura;T.Nakamura;M.Kwagniewski;M.Takahashi
• 通讯作者: M.Takahashi

A case study of determining orientations of in-situ horizontal principal stresses based on electrical images of borehole failures at a deep drilling project

基于深钻项目钻孔故障电图像确定原位水平主应力方向的案例研究

• 发表时间: 2006
• 期刊: Proceedings of the ISRM Symposium EUROCK 2006 (Taylor ＆ Francis Group, ISBN 0 415 40265 1)
• 作者: Weiren Lin;et al.
• 通讯作者: et al.

Comparison of in-situ stress orientations and magnitudes determined by anelastic stra in recovery measurement and borehole breakout analysis in the vicinity of an activc fault, in : Proceedings of the 11^<th> International Congress of International Societ

活断层附近恢复测量和钻孔破裂分析中由滞弹性地层确定的地应力方向和大小的比较，见：第 11 届国际学会国际大会论文集

• 发表时间: 2007
• 作者: Weiren Lin;et al.;Weiren Lin et al.
• 通讯作者: Weiren Lin et al.