Offshore electrical exploration of sedimentary basins: The effects of anisotropy in horizontally isotropic, layered media
Offshore electrical exploration of sedimentary basins: The effects of anisotropy in horizontally isotropic, layered media
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沉积盆地海上电法勘探：水平各向同性层状介质中各向异性的影响
作者：
R. N. Edwards;D. Nobes;E. Gómez
我们用于海底勘探的电气方法包括一个长的、垂直的、双极交流源，从海面向下延伸到海底，以及一个位于海底的远程、封装的、微处理器控制的磁力计。磁场的振幅和相位在一系列合适的频率和发射器-磁力计间隔内测量。在低频静态极限下，类似于标准斯伦贝谢电阻率测深曲线的视电阻率曲线被构造为直接解释各向同性地壳电阻率的辅助工具。当发射器-接收器间隔超过区域深度的两倍时，可检测到中间相对电阻或相对导电区域。在具有不同水平和垂直折射率的各向异性地壳中，该方法所分辨的物理性质是两个独立折射率的几何平均值。层的厚度是不确定的。A la...
Our electrical method for exploring beneath the sea consists of a long, vertical, bipolar ac source, extending downward from the sea surface to the bottom of the sea and a remote, encapsulated, microprocessor‐controlled magnetometer located on the sea floor. The amplitude and phase of the magnetic field are measured over a range of suitable frequencies and transmitter‐magnetometer separations. At the low‐frequency static limit, apparent resistivity curves, similar to standard Schlumberger resistivity sounding curves, are constructed as an aid in the direct interpretation of isotropic crustal resistivity. An intermediate relatively resistive or relatively conductive zone is detectable when the transmitter‐receiver separation exceeds the order of twice the depth to the zone. The physical property resolved by the method in an anisotropic crust, which has different horizontal and vertical resistivities, is the geometric mean of the two independent resistivities. The thickness of a layer is indeterminate. A la...