Definitions and Laboratory Techniques of Compressional Sound Velocity Parameters and Wet-Water Content, Wet-Bulk Density, and Porosity Parameters by Gravimetric and Gamma Ray Attenuation Techniques
Definitions and Laboratory Techniques of Compressional Sound Velocity Parameters and Wet-Water Content, Wet-Bulk Density, and Porosity Parameters by Gravimetric and Gamma Ray Attenuation Techniques
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压缩声速参数和湿含水量、湿体积密度和孔隙率参数的定义和实验室技术（通过重力和伽马射线衰减技术）
DOI：
10.2973/dsdp.proc.33.app1.1976
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发表时间：
1976
期刊：
影响因子：
--
通讯作者：
R. Boyce
中科院分区：
文献类型：
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作者：
R. Boyce
在深海钻探项目的第33航次，对相同的“未受扰动”样品测量了以下物理特性：声速、湿体积密度（湿饱和沉积物的重量与其体积之比，g/cc）和湿水含量（沉积物中海水的重量与湿饱和沉积物的重量之比，以百分比表示）。这些参数允许计算地震阻抗、地震反射系数和孔隙度（沉积物中水的体积与湿饱和沉积物的体积的比率，以百分比表示）。在可能的情况下，测量平行和垂直于层面的速度，这使得声学各向异性进行计算。除了上述单独取样外，还使用伽马射线衰减孔隙度评价仪（GRAPE）（Evans，1965）连续测定湿堆密度。根据该湿体积密度模拟数据，可以通过使用假定或估计的颗粒密度值，使用岩心图中的诺模图来估计孔隙度。除了连续2秒计数模式外，GRAPE设备还可以在单个样本的静态2分钟计数模式（GRAPE特殊2分钟计数）下运行。本文讨论了声速，湿水含量和GRAPE设备的技术，然后讨论了Leg 33的物理特性演示。
On Leg 33 of the Deep Sea Drilling Project the following physical properties were all measured on the same "undisturbed" samples: sound velocity, wet-bulk density (ratio of the weight of wet-saturated sediment to its volume, g/cc), and wet-water content (ratio of the weight of sea water in the sediment to the weight of the wet-saturated sediment, expressed as percent). These parameters allowed calculation of seismic impedance, seismic reflection coefficients, and porosity (ratio of the volume of water in the sediment to the volume of the wet-saturated sediment, expressed as percent). Where possible, velocities were measured parallel and perpendicular to bedding planes, which allowed the acoustic anisotropy to be calculated. In addition to the above individual sampling, the wetbulk density was also determined continuously using the Gamma Ray Attenuation Porosity Evaluator (GRAPE) (Evans, 1965). From this wet-bulk density analog data, porosity can be estimated using the nomogram in the core plots by using assumed or estimated grain density values. The GRAPE device can also be run in a static 2minute counting mode for individual samples (GRAPE Special 2-Minute Count) in addition to the continuous 2-second counting mode. Techniques for sound velocity, wet-water content, and the GRAPE device are discussed in this paper, followed by a discussion of the Leg 33 physical properties presentation.