Impact of Silica Diagenesis on Physical Property Variations
Impact of Silica Diagenesis on Physical Property Variations
复制标题
二氧化硅成岩作用对物性变化的影响
DOI：
10.2973/odp.proc.sr.127128-1.111.1992
复制
发表时间：
1992
期刊：
影响因子：
64.8
通讯作者：
P. Holler
中科院分区：
文献类型：
--
作者：
D. Nobes;R. Murray;S. Kuramoto;K. Pisciotto;P. Holler
硅质成岩界面，特别是从蛋白石-A到蛋白石-CT的过渡，是日本海重要的地震和热层位。成岩作用对储层的室内和井下物性有显著影响。指数属性残留物被用于X射线衍射和扫描电子显微镜研究，补充物理性质和测井数据，使我们可以检查成岩过渡的一些细节。我们确定了最尖锐的物理性质梯度与蛋白石-A/蛋白石-CT的边界为每个网站，在许多情况下，边界是不同于以前定义的。在蛋白石-A/蛋白石-CT边界的物理性质的变化，特别是声速，是不同的。蛋白石-A到蛋白石-CT过渡区的厚度取决于该区域的定义方式。如果我们将成岩过渡带解释为在明显变化或趋势开始的点与变化与自然背景变化无法区分的点之间，则该区域可以为10 m或更厚。各种物理性质的剖面通常是平行的，并且在成岩边界之上开始变化。这与蛋白石-CT的浅层发生一致。相反，蛋白石-CT到石英的转变是迅速的，并且过渡区最多为1米厚。在蛋白石-CT/石英边界上，物理性质的变化并不明显。
The silica diagenetic boundaries, especially the transition from opal-A to opal-CT, are significant seismic and thermal horizons in the Japan Sea. Diagenesis has a marked effect on laboratory and downhole logging physical properties. Index property residues were used for X-ray diffraction and scanning electron microscopy studies that complement the physical property and logging data so that we may examine the diagenetic transitions in some detail. We identify the sharpest physical property gradients with the opal-A/opal-CT boundaries for each site; in a number of cases, the boundaries are different from those previously defined. The changes in the physical properties, especially the acoustic velocity, are distinct across the opal-A/opal-CT boundary. The thickness of the opal-A to opal-CT transition zone depends on the way in which the zone is defined. If we interpret the diagenetic transition zone to be between the point where a clear-cut change or trend starts, to the point where the changes are indistinguishable from the natural background variability, then the zone can be 10 m or more thick. The profiles of the various physical properties are often parallel, and begin to change well above the diagenetic boundary. This is consistent with the shallow occurrence of opal-CT. The opal-CT to quartz transformation, in contrast, is rapid, and the transition zone is at most 1 m thick. The physical property changes are not as distinct across the opal-CT/quartz boundary.