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

该项目支持电缆传感器系统的制造，并将其部署在太平洋东北部的六个地点，以研究Juan de Fuca Ridge两个地区的水文地质。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合作开发和集成仪器。完整的传感器系统（此处支持）和数据记录包（由GSC制造）将安装在由美国国家科学基金会领导的国际财团运营的钻井船JOIDES Resolution钻探的海底孔中。井眼密封系统将由德克萨斯州a&m大学的工程师制造，该大学是JOIDES Resolution作业的分包商。本研究是在1991-1994年成功开发和部署这些海底“观测站”之后进行的，这些观测站被称为“CORKs”，用于在以前的六个孔进行水文地质调查。它提议整修两个现有场址，并在1996年夏季钻探的四个新场址部署。该研究的基本目标是确定两个不同区域海底的水文地质特性，解决海洋地壳内孔隙流体流动速率的问题，以及与岩石“储层”中压裂程度、整体渗透率和裂缝非均质性以及可移动流体体积相关的问题。这项研究与海底热液系统的研究和海洋热化学平衡的研究密切相关，所有这些研究都必须对这些性质进行隐含或明确的假设。该项目开展的工作包括对地下物性进行多年被动监测，以及在现有钻孔之间进行主动压力脉冲传输，以确定中间储层的物性。每年对部署地点的访问和连续的数据记录将提供独特的地壳下过程的长期记录。＊＊＊

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. ***