ODP Leg 139, Hole 858G - Well Logging Data

Logging data are measurements of physical properties of the formation surrounding a borehole, acquired in situ after completion of coring (wireline logging) or during drilling (Logging-While-Drilling, LWD). The range of data (resistivity, gamma radiation, velocity, density, borehole images,…) in any hole depends on the scientific objectives and operational constraints.测井数据（Logging data）是对井眼周围地层物理特性的原位测量结果，其采集时机分为取心作业完成后（电缆测井，wireline logging）以及钻井过程中（随钻测井，Logging-While-Drilling, LWD）。任一井眼所采集的数据类别（涵盖电阻率、伽马辐射、声波速度、密度、井壁成像测井等），均由其科学目标与作业约束条件决定。