Density of Cuttings of the KTB Pilot Hole Vb1

The density of rocks depends on the mineral contents and is therefore a helpful property for the discrimination of lithological units. It is also used for the calculation of several other properties, like the heat production rate from potassium, uranium and thorium contents, volume susceptibility, thermal conductivity, etc. The density of cuttings and cores is determined by the Archimedian method. The weight of the sample is determined in air and in water. Knowing the density of water, the volume and the density of the sample is calculated.
Air adsorbed by the large surface of the cuttings causes errors in the calculated volume. Therefore, the specific surface of the cuttings is minimized by using only cuttings greater than 2 mm in diameter. The depth interval of the measurements is generally 2 m.

岩石的密度取决于矿物成分，因此是区分岩性单元的重要属性。它还用于计算多种其他属性，例如由钾、铀和钍含量得出的产热率、体积磁化率、热导率等。岩屑和岩心的密度通过阿基米德法（Archimedian method）测定：先测量样品在空气中和水中的重量，再利用已知的水密度计算样品的体积和密度。

岩屑的大表面积会吸附空气，导致计算出的体积存在误差。因此，仅使用直径大于2毫米的岩屑以最小化其比表面积。测量的深度间隔通常为2米。