Apparent dip and apparent anisotropy from multifrequency triaxial induction measurements
Apparent dip and apparent anisotropy from multifrequency triaxial induction measurements
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DOI：
10.1190/1.3511349
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发表时间：
2011-01
期刊：
影响因子：
3.3
通讯作者：
T. Hagiwara
中科院分区：
文献类型：
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作者：
T. Hagiwara
三轴（或多分量）感应测井不仅用于测量各向异性地层的电阻率各向异性，而且用于测量仪器相对于地层的相对倾角。层状地层的各向异性电阻率和相对倾角也从三轴感应测井测量反演在一个深度通过假设一个均匀的各向异性地层或在多个深度通过假设一个多层地层模型。当三轴感应测井在多个频率下运行时，可以将多频率聚焦应用于测井测量。然后，视倾角的代数定义的频率聚焦三轴感应测量在一个深度。表观倾角产生各向异性地层中的真实倾角。代数计算的视倾角可用于确定层状地层中的有效倾角。在薄层地层中，视倾角就是真倾角。视倾角也可以反映各向异性厚地层的真实倾角。H...
The triaxial (or multicomponent) induction log is used to measure not only the resistivity anisotropy of an anisotropic formation but also the relative dip of the tool with respect to the formation. The anisotropic resistivity and the relative dip of layered formations are also inverted from the triaxial induction-log measurements at a depth by assuming a homogeneous anisotropic formation or at multiple depths by assuming a multilayered formation model. When the triaxial induction log is run at multiple frequencies, multifrequency focusing can be applied to the log measurements. Then, the apparent dip is algebraically defined from the frequency-focused triaxial induction measurements at a depth. The apparent dip yields the true dip in an anisotropic formation. The algebraically calculated apparent dip may be used to determine the effective dip in layered formations. The apparent dip yields the true dip in thinly bedded formations. The apparentdip also yields the true dip in thick anisotropic formations. H...