Feasibility Study for the Geoprops ODP Probe: In-Situ Measurements of Physical Properties

地球科学各个方面的量化是 这就产生了对这种精确测量的日益增长的需求， 物理性质、机械状态参数、 和化学成分。 ODP漏洞越来越多 被认为是环境条件的重要探测器， 以及岩性的记录。 各种技术是可用的 用于ODP孔中所需数量的测量，但大多数 其中一些在中等程度上被证明是贫穷的。 固结沉积物，其中包括不断增加的 钻孔长度百分比。 在JOI/乌萨克关于 ODP中的物理性质，这一问题得到了解决， 建议a开发Navidrill/Geoprops概念。 在这个概念中，在主管道前方5 m处钻一个3 3/4”的孔 钻头与泥浆马达驱动取芯钻头和桶。这个Navidrill 组件可以在砂线和Geoprops探针上撤回， 具有封隔器和传感器阵列的内部记录系统， 可快速放入小孔中。 保守的初始 设计设想测量温度、孔隙压力。 渗透率，应力方向和孔隙流体组成，但 如果该概念是成功的，则可以添加其他测量。 在建造Geoprops探测器之前， 必须确保这样一个 方法，概述科学和工程的限制， 并制定总体布局。 该奖项将支持这样一个 study.

The quantification of all aspects of the geosciences is creating a growing demand for accurate measurements of such quantities as physical properties, mechanical state parameters, and chemical compositions. ODP holes are becoming increasingly recognized as important probes of environmental conditions as well as records of lithology. Various techniques are available for measurements of the desired quantities in ODP holes, but most of these have proved to be poor in sections of moderately consolidated sediments, which comprise an ever increasing percentage of footage drilled. At the JOI/USSAC workshop on Physical Properties in ODP, this concern was addressed and a recommendation a made to develop the Navidrill/Geoprops concept. In this concept, a 3 3/4" hole is drilled 5 m ahead of the main bit with a mud-motor drive core bit and barrel. This Navidrill assembly can be withdrawn on a sand line and Geoprops probe, an internally recording system with packers and an array of sensors, can be quickly placed in the small hole. A conservative initial design envisages measurements of temperature, pore pressure. permeability, stress orientation and pore fluid composition, but other measurements could be added if the concept is successful. Before construction of the Geoprops probe, a feasibility study is necessary to insure the need for and suitability of such an approach, to outline the scientific and engineering constraints, and to develop a general layout. This award will support such a study.