Stress Magnitude Measurements to Mid-Crustal Depth in the KTB Borehole

限制地壳中的应力大小 如果说这是岩石圈广泛问题的基础， 力学 KTB钻探和取芯至10公里深度的计划 德国的项目是第一次有机会 在孕震深度测量地应力值， 大陆地壳 传统的应力测量技术不能 在KTB主钻孔或大多数其他深钻孔中使用。 因此，本项目旨在开发一种新型的集成 最终用于10公里深度应力测量战略 KTB钻孔和其他深孔，如现有的那些 在苏联。 有四项主要活动与 开发和实施拟议的压力测量， 战略：对突破和热 井眼裂缝发育充分， 井眼破坏综合理论， 岩心综合实验室试验， 利用水力压裂的应力测量， 套管中的穿孔。 这项研究是在 与卡尔·福克斯大学教授合作， 卡尔斯鲁厄和波鸿鲁尔大学的Fritz Rummel教授。 岩心样品的实验室强度测量将在 与美国地质学家詹姆斯·拜尔利博士合作 调查.

Constraining the magnitudes of stresses in the earth's crust if fundamental to a broad range of problems of lithospheric mechanics. The plan to drill and core to 10 km depth by the KTB project of West Germany represents the first opportunity to measure in situ stress magnitudes at seismogenic depth in continental crust. Conventional stress measurement techniques cannot be employed in the KTB main borehole, or most other deep boreholes. Thus, this project is aimed at development of a novel integrated stress measurement strategy for eventual use to 10 km depth in the KTB borehole and other deep holes, such as those that exist in the Soviet Union. There are four main activities associated with developing and implementing the proposed stress measurement strategy: Making detailed observations of breakouts and thermal fractures in the borehole, development of sufficiently comprehensive theories of borehole failure, conducting comprehensive laboratory tests on core and making least principal stress measurements utilizing hydraulic fractures through perforations in the casing. This research is being done in collaboration with Prof. Karl Fuchs of the University of Karlsruhe and Prof. Fritz Rummel of Ruhr University-Bochum. Laboratory strength measurements of core samples will be done in collaboration with Dr. James Byerlee of the U.S. Geological Survey.