(Table 1) Inhole temperatures at DSDP Leg 66 Holes

An extensive program of inhole geophysical measurements, implementing the Gearhart-Owen logging package and Uyeda temperature probe, was planned in support of the drilling program. These measurements were designed to aid in predicting in situ physical property variations of lower, middle, and upper slope sediments. Correlation of these variations with the extensive seismic reflection grid would aid in interpreting sediment response to the dynamic effects of subduction. In situ temperature measurements may help to substantiate the gas hydrate reflection as the phase boundary between hydrated and nonhydrated sediments. Unfortunately, Murphy's laws prevailed, and equipment malfunctions related to sand in the bit release mechanism thwarted our attempt to release the bit and log the open hole at all sites. In addition, incorrect assembly of the Uyeda tool and related bottom latching problems degraded part of the temperature data collected with this device.为支撑本次钻井作业计划，我们规划了一套完备的井中地球物理测量（inhole geophysical measurements）方案，配套使用Gearhart-Owen测井仪套件（Gearhart-Owen logging package）与Uyeda温度探头（Uyeda temperature probe）。本测量方案旨在辅助预测下、中、上斜坡沉积物的原位物理性质变化。将上述物性变化与大范围地震反射网格进行关联，将有助于阐释沉积物对俯冲动力学效应的响应规律。原位温度测量则可用于验证天然气水合物（gas hydrate）反射信号对应着水合沉积物与非水合沉积物之间的相界。 遗憾的是，墨菲定律（Murphy's laws）悉数应验：钻头释放机构内混入砂粒引发的设备故障，使得我们无法在所有测点完成裸井段的钻头释放与测井作业。此外，Uyeda工具组装不当以及相关的底部锁扣故障，导致该设备采集的部分温度数据质量出现劣化。