Instrumented Borehole Seals for 1996 ODP Drilling on the Juan de Fuca Ridge

9530426 Becker该项目支持制造电缆传感器系统，并将其部署在太平洋东北部的六个地点，以研究胡安德富卡海脊两个区域的水文地质。佛罗里达迈阿密大学的Keir Becker博士将与加拿大地质调查局的研究人员和德克萨斯农工大学的工程师在仪器开发和集成方面进行合作。完整的传感器系统(在此得到支持)和数据记录包(由GSC建造)将安装在由JOIDES决议号钻井船钻探的海底孔中，该钻井船由国家科学基金会牵头的一个国际财团运营。井眼密封系统将由负责JOIDES解决方案业务的分包商德克萨斯农工大学的工程师制造。这项研究是在1991-1994年成功开发和部署了这些海底下“观测站”之后进行的，这些观测站被称为“软木塞”，用于在以前的六个孔中进行水文地质调查。它提议整修两个现有地点，并在1996年夏季期间将钻探的四个新地点部署。这项研究的基本目标是确定两个不同地区海底的水文地质特性，解决有关洋壳内孔隙流体流动速度的问题，以及有关破裂程度、整体渗透率和裂缝非均质性以及岩石“储集层”中可移动流体的数量的问题。这项研究与海底热液系统研究和海洋热量和化学平衡研究密切相关，所有这些研究都必须对这些性质作出隐含或明确的假设。该项目开展的工作包括持续多年的地下物理性质的被动监测和现有钻孔之间的主动压力脉冲传输，以确定中间储集层的性质。每年对部署地点的访问和持续的数据记录将提供关于地壳下过程的独特的长期记录S。***

9530426 Becker This project supports the fabrication of cable sensor systems and their deployment at six sites in the northeastern Pacific Ocean to study the hydrogeology of two regions of the Juan de Fuca Ridge. Dr. Keir Becker of University of Miami (Florida) will collaborate in the instrument development and integration with researchers from the Geologic Survey of Canada and engineers at Texas A&M University. The full sensor systems (supported herein) and data recording packages (built by GSC) will be installed in seafloor holes drilled by the drill ship JOIDES Resolution, operated by an international consortium led by the National Science Foundation. Borehole seal systems will be fabricated by engineers at Texas A&M University, the subcontractor responsible for JOIDES Resolution operations. The present study follows the successful development and deployment of these subseafloor "observatories," designated "CORKs," for hydrogeologic investigations in six previous holes in 1991-1994. It proposes refurbishment of two existing sites and deployment at four new sites to be drilled during summer 1996. The basic objective of the research is to define hydrogeologic properties of the seafloor in two different regions, addressing questions about rates of pore fluid flow within the ocean crust, and related questions about the degree of fracturing, bulk permeability and fracture heterogeneity, and the volume of mobile fluid in the rock "reservoir." This research is closely related to research on submarine hydrothermal systems and study of heat and chemical balances in the oceans, all of which must make implicit or explicit assumptions about these properties. The work undertaken in this project includes both passive monitoring of subsurface physical properties for multi-year duration and active pressure pulse transmission between existing drill holes to define intervening reservoir properties. Annual visits to the deployment sites and continuous data logging will provide unique long term record s of subcrustal processes. ***