scholarly journals A superposition algorithm to construct efficient pseudo-random waveform for frequency-domain controlled-source electromagnetic method

2020 ◽  
Author(s):  
Yang Yang ◽  
Jishan He ◽  
Shucai Li
Keyword(s):  
Frequency Domain ◽  
Electromagnetic Method ◽  
Controlled Source

Magnitude-phase Relationship behind Controlled-source Electromagnetic Field Revealed by Nyquist Diagrams

2017 ◽  
Vol 22 (4) ◽  
pp. 365-373
Author(s):  
Dajun Li ◽  
Aihua Weng ◽  
Yue Yang ◽  
Song Han ◽  
Yu Tang
Keyword(s):  
Electromagnetic Field ◽  
Data Processing ◽  
Frequency Domain ◽  
Electric Fields ◽  
Phase Relationship ◽  
Electromagnetic Method ◽  
Nyquist Diagram ◽  
Controlled Source ◽  
Data Inversion ◽  
D Model

We present a means of processing data from frequency-domain controlled-source electromagnetic method observations via a Nyquist diagram. For a controlled-source electromagnetic field in the frequency domain, the x component of the electric field and the y and z components of the magnetic fields were chosen for discussion. Typical 1-D models and a 3-D model, which have a single anomalous body embedded in a half space, have been used to calculate the complex electromagnetic fields. The corresponding Nyquist diagrams have been plotted and analyzed. The diagrams can reveal the magnitude-phase frequency characteristics of an electromagnetic field and can be used to guide data processing by considering the constraints of the intrinsic connection between amplitude and phase. The results further show that: (1) the Nyquist diagrams of both electric and magnetic responses, varying from low to high frequencies, are all characterized by continuous, single-direction, clockwise spiral curves; (2) for the magnetic field, the opening direction of the Nyquist curve is upward for the y and downward for the z components, regardless of the change in resistivity; (3) for the electric fields, the resistivity changes also lead the spiral structure to take on complicated shapes, such as a snail-like shape or a W, and the starting points of the Nyquist curves depend on the variations in the resistivity with depth. According to the aforementioned rules, we can obtain reliable and reasonably complex field data during the data processing of frequency-domain controlled-source electromagnetic method, which lays a foundation for 3-D frequency-domain data inversion.

Delineating ore-forming rock using a frequency domain controlled-source electromagnetic method

2019 ◽  
Vol 115 ◽  
pp. 103167
Author(s):  
Wen Chen ◽  
Guoqiang Xue ◽  
Nannan Zhou ◽  
Dongmei Tang ◽  
Dongyang Hou ◽  
...  
Keyword(s):  
Frequency Domain ◽  
Electromagnetic Method ◽  
Controlled Source

Prediction of double stacking hydrocarbon using Marine Controlled Source Electromagnetic method

2014 ◽  
Author(s):  
Muhammad Rauf ◽  
Noorhana Yahya ◽  
Tadiwa Elisha Nyamasvisva ◽  
Adeel Ansari ◽  
Afza Shafie ◽  
...  
Keyword(s):  
Electromagnetic Method ◽  
Controlled Source

Inversion of frequency-domain marine-controlled-source electromagnetic data using genetic algorithm

2017 ◽  
Author(s):  
Mohit Ayani ◽  
Subhashis Mallick ◽  
Jürg Hunziker ◽  
Lucy MacGregor
Keyword(s):  
Genetic Algorithm ◽  
Frequency Domain ◽  
Controlled Source ◽  
Electromagnetic Data

Complex Resistivity Method and its Application in Mineral Resource Exploration

2011 ◽  
Vol 396-398 ◽  
pp. 115-118
Author(s):  
Xin Gong Tang ◽  
Xing Bing Xie ◽  
Liang Jun Yan
Keyword(s):  
Oil And Gas ◽  
Supply And Demand ◽  
Mineral Resources ◽  
Underground Water ◽  
Electromagnetic Method ◽  
Complex Resistivity ◽  
West China ◽  
Controlled Source ◽  
Resistivity Method ◽  
Resource Exploration

Complex resistivity (CR) is one of an electromagnetic method which plays an important role in the exploration of oil and gas, underground water as well as solid mineral resources in recent years. Nowadays China is under fast developing and there is still a big gap between the supply and demand of mineral resources. As an effective controlled source electromagnetic method, CR method can be easily used to judge the content of resources, determine the target reservoir and select a favorable drilling area. In this paper, an introduction to CR method and its application in copper mine exploration in west China is present. The result shows that CR is an effective electromagnetic method in the exploration of deep mineral resources.

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