L-31N Lithological and Geophysical Data

The objectives of this data acquisition project were to provide the on-site geologic expertise while the four coreholes and the deepest well in each cluster were drilled and constructed, and to complete the downhole geophysical logging including video and flow meter logging of these boreholes. The USGS on-site geologist provided technical guidance to the drill crew, described the lithology of the core and unconsolidated sediments, and stored the cores and sediment samples for the duration of the project. USGS staff provided and ran gamma ray, fluid conductivity and temperature, EM-induction, 3-arm caliper, full wave form sonic tools, a heat-pulse flow meter, an OBI-40 Mark III digital optical tool, and the Laval video tool.

本数据采集项目的目标为：在4个取心钻孔及每个井组中的最深井钻进与施工期间提供现场地质技术支持，并完成上述钻孔的井下地球物理测井工作，含视频测井与流量计测井。美国地质调查局（USGS）的现场地质师为钻井班组提供技术指导，描述岩心与松散沉积物的岩性，并在项目全周期内妥善保管岩心及沉积物样品。USGS工作人员还负责配备并操作伽马射线测井仪、流体电导与温度测井仪、电磁感应测井仪、三臂井径测井仪、全波形声波测井仪、热脉冲流量计测井仪、OBI-40 Mark III型数字光学测井仪以及拉瓦尔视频测井仪。