Exploration of resistive targets within shallow marine environments using the Circular Electrical Dipole and the Differential Electrical Dipole methods: A time-domain modelling study
Exploration of resistive targets within shallow marine environments using the Circular Electrical Dipole and the Differential Electrical Dipole methods: A time-domain modelling study
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DOI：
10.1093/gji/ggw051
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发表时间：
2016-05
影响因子：
2.8
通讯作者：
A. Haroon;V. Mogilatov;M. Goldman;R. Bergers;B. Tezkan
中科院分区：
文献类型：
--
作者：
A. Haroon;V. Mogilatov;M. Goldman;R. Bergers;B. Tezkan
从理论上分析了圆形电偶极子（CED）和差分电偶极子（DED）两种新的瞬变可控源电磁法在浅海环境中的应用。1-D和3-D时域建模研究被用来调查的可探测性和适用性的方法时，调查电阻层/目标代表烃饱和地层。与传统的时域水平电偶极子（HED）和垂直电偶极子（VED）源的结果进行了比较。应用的理论建模研究表明，CED和DED具有更高的信号检测电阻性目标相比，TD-CSEM，但表现出显着较差的信号幅度。未来的CED/DED应用必须在测量之前解决这个问题。此外，这两种新的方法有非常相似的探测能力的特点，对3-D电阻性目标嵌入在海洋沉积物中的VED，而对非垂直度不太敏感。由于CED/DED的发射机设计复杂，系统容易产生几何误差。模拟研究表明，即使是很小的发射机不准确性有很大的影响，信号特征的CED使一个实际的海洋应用在目前的困难。相反，与CED相比，DED信号受几何误差的影响较小，因此可能更适合海洋应用。
S U M M A R Y Two novel transient controlled source electromagnetic methods called circular electrical dipole (CED) and differential electrical dipole (DED) are theoretically analysed for applications in shallow marine environments. 1-D and 3-D time-domain modelling studies are used to investigate the detectability and applicability of the methods when investigating resistive layers/targets representing hydrocarbon-saturated formations. The results are compared to the conventional time-domain horizontal electrical dipole (HED) and vertical electrical dipole (VED) sources. The applied theoretical modelling studies demonstrate that CED and DED have higher signal detectability towards resistive targets compared to TD-CSEM, but demonstrate significantly poorer signal amplitudes. Future CED/DED applications will have to solve this issue prior to measuring. Furthermore, the two novel methods have very similar detectability characteristics towards 3-D resistive targets embedded in marine sediments as VED while being less susceptible towards non-verticality. Due to the complex transmitter design of CED/DED the systems are prone to geometrical errors. Modelling studies show that even small transmitter inaccuracies have strong effects on the signal characteristics of CED making an actual marine application difficult at the present time. In contrast, the DED signal is less affected by geometrical errors in comparison to CED and may therefore be more adequate for marine applications.