Thermal conductivities under high pressure in core samples from IODP NanTroSEIZE drilling site C0001
Thermal conductivities under high pressure in core samples from IODP NanTroSEIZE drilling site C0001
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DOI：
10.1029/2010gc003449
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发表时间：
2011-06
期刊：
影响因子：
3.7
通讯作者：
Weiren Lin;O. Tadai;T. Hirose;W. Tanikawa;Manabu Takahashi;H. Mukoyoshi;M. Kinoshita
中科院分区：
文献类型：
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作者：
Weiren Lin;O. Tadai;T. Hirose;W. Tanikawa;Manabu Takahashi;H. Mukoyoshi;M. Kinoshita
我们研究了高压力对岩石样品的热导率的影响，从斜坡，裙相和上部的增生棱柱在站点C 0001的NanTroSEIZE钻探计划和其他样品的五个陆地岩石类型。对于湿（水饱和）和干样品，热导率明显地随着压力的增加而增加。我们测定了NanTroSEIZE沉积物的热导率变化率，当压力增加时为0.014 Wm− 1 K −1/MPa，当压力降低时为0.01 Wm− 1 K −1/MPa。使用确定的压力下降的速率，我们估计，在大气压力下测得的热导率，而不是在原位压力下测得的热导率可能会被低估7%的核心样品从约1公里的深度和20%的核心样品从约3公里的深度。总的来说，导热系数随压力的变化率与孔隙率呈正相关。然而，热导率变化率与孔隙度的关系还取决于沉积物和岩石的组构、矿物成分和孔隙结构。此外，对于我们测试的两种砂岩，压力对干样品热导率的影响大于湿样品。
We examined the effects of high pressure on thermal conductivity in core samples from the slope–apron facies and the upper part of the accretionary prism at site C0001 of the NanTroSEIZE drilling program and in other samples of five terrestrial rock types. Thermal conductivity clearly increased with increasing pressure for both wet (water saturated) and dry samples. We determined the rate of thermal conductivity change of the NanTroSEIZE sediments to be 0.014 Wm−1K−1/MPa when pressure was increased, and 0.01 Wm−1K−1/MPa when pressure was decreased. Using the rate determined for decreasing pressure, we estimated that thermal conductivities measured at atmospheric pressure rather than at in situ pressure may be underestimated by 7% for a core sample from around 1 km depth and by 20% for a core sample from around 3 km depth. In general, the rate of thermal conductivity change with pressure showed a positive correlation with porosity. However, the relationship of the rate of thermal conductivity change to porosity is also dependent on the fabric, mineral composition, and pore structure of the sediments and rocks. Furthermore, for two sandstones we tested, the effect of pressure on thermal conductivity for dry samples was greater than that for wet samples.