Modeling magnetostratigraphy in a borehole
Modeling magnetostratigraphy in a borehole
复制标题
钻孔中的磁性地层学建模
DOI：
10.1190/1.1442740
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发表时间：
1989
期刊：
影响因子：
3.3
通讯作者：
V. Courtillot
中科院分区：
文献类型：
--
作者：
Y. Gallet;V. Courtillot
计算了通过一系列不同磁化强度的倾斜层和平面界面钻孔的磁场。虽然剩余磁化强度本身是一种有用的岩石性质，但重点是恢复磁地层学应用（测年、对比）的剩余磁化极性转变。在距离极性反转界面不同距离处，以轴向垂直剖面和孔剖面图的形式给出了各种地质兴趣案例的结果。垂直剖面的分辨能力约为井眼半径的6倍；对于磁化强度大于10-3Am-1的岩石，对于灵敏度为0.1 nT的仪器，可以期望获得有意义的磁地层学。在许多自然矿床中，可能不需要采用渐进退磁来恢复极性序列。根据所观察的磁场和磁化分量的不同，截面图显示c…
The magnetic field along a hole bored through a sequence of dipping layers with varying magnetization and planar interfaces is calculated. The emphasis is on recovering remanent magnetization polarity transitions for magnetostratigraphic applications (dating, correlations), although intensity of remanent magnetization can in itself be a useful rock property. Results are presented for various cases of geologic interest in the form of axial vertical profiles and section maps of the holes at varying distances from polarity reversal interfaces. The vertical profiles demonstrate a resolving power of about six times the hole radius; meaningful magnetostratigraphies can be expected for rocks with a magnetization larger than 10-3Am-1, for instruments with a sensitivity of 0.1 nT. In a number of natural occurrences, it may not be necessary to resort to progressive demagnetization to recover the polarity sequence. Depending on which magnetic field and magnetization component one looks at, the section maps display c...