• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Asian earth sciences >A reassessment of the stress and natural fracture orientations from analysis of image logs in the Chinese Continental Scientific Drilling Program borehole at Donghai county, Jiangsu province, China
【24h】

A reassessment of the stress and natural fracture orientations from analysis of image logs in the Chinese Continental Scientific Drilling Program borehole at Donghai county, Jiangsu province, China

机译：通过对中国大陆科学钻探计划在江苏省东海县的钻孔中的图像测井进行分析，重新评估应力和自然裂缝的方向

获取原文
获取原文并翻译 | 示例
       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The Chinese Continental Scientific Drilling (CCSD) project has drilled a 5100 m deep research borehole in the Sulu ultra-high pressure (UHP) metamorphic belt, eastern China. The UHP metamorphic belt is thought to be a product of continent-continent collision and has consequently experienced very intensive structural deformation. Based on a more complete well log data set of CCSD borehole, we can have a more detailed and reliable study on the structure features of borehole wall and other rock physical properties than a previous study published in 2009. Abundant data related to borehole breakouts (BOs), drilling induced tensile fractures (DITFs) and natural fractures were collected from the image logs. The BO and DITF data indicate that the average direction of the maximum horizontal principal stress (S-H) of the CCSD borehole site is about 79.2 degrees which is consistent with the convergent direction (E-W) of the Pacific Sea Plate with respect to the Eurasian Plate. Analysis of DITFs indicated that in the case of the CCSD borehole, axial drilling induced tensile fractures (ADITFs) occur occasionally in the upper section (0-2300 m) of the borehole with low dipping angle (0-10 degrees), while transverse drilling induced tensile fractures (TDITTs) occur significantly in the lower section (3800-5000 m) with high dipping angle (10-30'). The natural fracture distribution at depth in the metamorphic rocks of the CCSD borehole indicates that (1) the failure strength of rocks and borehole depth are two factors that affects natural fracture frequency, (2) most of the dip azimuth of natural fractures is consistent with the dip azimuth of foliations observed in the core, (3) the development of most of the natural fractures probably was dominated by the development of foliations, and both the natural fractures and foliations developed in response to the subduction and exhumation of the Sulu terrene.
机译：中国大陆科学钻探（CCSD）项目在中国东部的苏禄超高压（UHP）变质带中钻了一个5100 m深的研究井眼。 UHP变质带被认为是大陆-大陆碰撞的产物，因此经历了非常强烈的结构变形。基于CCSD钻孔的更完整的测井数据集，我们可以比2009年发表的先前研究对钻孔壁的结构特征和其他岩石物理特性进行更详细，更可靠的研究。与钻孔破裂（BOs）相关的大量数据），从图像测井中收集了钻井引起的张性裂缝（DITF）和自然裂缝。 BO和DITF数据表明，CCSD钻孔现场的最大水平主应力（S-H）的平均方向约为79.2度，这与太平洋海板相对于欧亚板块的会聚方向（E-W）一致。对DITF的分析表明，在CCSD钻孔的情况下，轴向钻孔引起的拉伸断裂（ADITF）偶尔会在低倾角（0-10度）的钻孔上部（0-2300 m）发生，而横向钻孔高倾角（10-30'）的下部（3800-5000 m）发生了明显的拉伸断裂（TDITT）。 CCSD变质岩深部的自然裂缝分布表明：（1）岩石的破坏强度和钻孔深度是影响自然裂缝发生频率的两个因素；（2）大多数自然裂缝的倾角与（3）大多数天然裂缝的发育可能主要是由页岩的发育决定的，而天然裂缝和页岩都是由于苏禄地层的俯冲和掘出而发育的。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号