3-D Crosswell Electromagnetic Inversion Based on General Measures

Wang, X.; Shen, Jui-Lung; Su, Benyu

doi:10.1109/tgrs.2021.3051930

Cited by 6 publications

(3 citation statements)

References 42 publications

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“…In addition, there is still a great platform named MARE2DEM for high-precision forward modelling and inversion, which could be applied to multiple geophysical scenes with 2.5D interpretation [47]. Since the main contribution of this study is the extension of existing theories for long-distance crosswell application without the innovation of the interpretation method, we adopt the classical Gauss-Newton method [48] to perform the inversion. It is known that the Gauss-Newton method is a traditional nonlinear iterative method that can perform well in image interpretation in the field of geophysics.…”

Section: Fig 10 Comparison Between Measured Data and Simulation Resultsmentioning

confidence: 99%

“…It should be clarified that the modeling and inversion are currently performed based on traditional algorithms, but the interpretation results can still provide a reliable basis for the feasibility of the proposed method. In the future, we will adopt advanced platform [46] and optimization algorithms [48]- [50] to realize more valuable data interpretation, and the study of high-precision inversion will be presented as our subsequent work.…”

Section: Fig 10 Comparison Between Measured Data and Simulation Resultsmentioning

confidence: 99%

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Long-Distance Crosswell EM Logging of Copper Ore Using Borehole-Surface Current Injection in Slim Holes

Dang

Zhao

Guo

et al. 2022

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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Crosswell electromagnetic (EM) methods are widely used in subsurface geophysical prospecting because they can achieve more effective long-distance detection than single-well methods. However, a large-diameter borehole is required to increase the magnetic moment of the magnetic dipole source. For the long-distance detection of copper ores, which is usually performed in slim holes, we present a borehole-surface currentinjection-based crosswell EM logging method. Considering the cost of deploying casing, we inject a low-frequency AC directly into the ground, and converging current is formed around lowresistance anomalies in the formation. Then, the distribution of the anomalies can be inferred by detecting the low-frequency alternating magnetic field of the converging current in the receiver well. Moreover, to further improve the detection performance, we design a placement scheme for the grounding electrode for multianomaly crosswell detection based on the Gauss-Newton inversion algorithm, where the EM responses for different grounding electrode locations are analyzed. Field experiments are conducted using two slim open holes spaced approximately 1000 m apart for the detection of two copper ores. Through the processing and interpretation of measured EM signals, the conductivity imaging results of the crosswell EM method indicate that the measured distribution of anomalies is consistent with prior knowledge obtained from numerous single-well loggings, demonstrating the feasibility of the proposed application for long-distance crosswell EM logging in slim open holes.

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Section: Fig 10 Comparison Between Measured Data and Simulation Resultsmentioning

confidence: 99%

Section: Fig 10 Comparison Between Measured Data and Simulation Resultsmentioning

confidence: 99%

Long-Distance Crosswell EM Logging of Copper Ore Using Borehole-Surface Current Injection in Slim Holes

Dang

Zhao

Guo

et al. 2022

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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show abstract

“…In recent years, the 3D RTM method has been applied in the field with promising cross-hole results [32][33][34]. Compared with traditional ray-based cross-well methods, RTM includes more wavefield information, allowing seismic wave energy to be returned to its true location in space, obtaining more accurate geological structures and providing higher-quality images [35,36]. In terms of cross-hole seismic RTM, researchers have proposed 2D cross-hole seismic transverse RTM imaging of acoustic waves and elastic waves in isotropic media [37].…”

Section: Introductionmentioning

confidence: 99%

3D Reverse-Time Migration Imaging for Multiple Cross-Hole Research and Multiple Sensor Settings of Cross-Hole Seismic Exploration

Cheng,

Peng,

Yang

2024

Sensors

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The two-dimensional (2D) cross-hole seismic computed tomography (CT) imaging acquisition method has the potential to characterize the target zone optimally compared to surface seismic surveys. It has wide applications in oil and gas exploration, engineering geology, etc. Limited to 2D hole velocity profiling, this method cannot acquire three-dimensional (3D) information on lateral geological structures outside the profile. Additionally, the sensor data received by cross-hole seismic exploration constitute responses from geological bodies in 3D space and are potentially affected by objects outside the well profiles, distorting the imaging results and geological interpretation. This paper proposes a 3D cross-hole acoustic wave reverse-time migration imaging method to capture 3D cross-hole geological structures using sensor settings in multi-cross-hole seismic research. Based on the analysis of resulting 3D cross-hole images under varying sensor settings, optimizing the observation system can aid in the cost-efficient obtainment of the 3D underground structure distribution. To verify this method’s effectiveness on 3D cross-hole structure imaging, numerical simulations were conducted on four typical geological models regarding layers, local high-velocity zones, large dip angles, and faults. The results verify the model’s superiority in providing more reliable and accurate 3D geological information for cross-hole seismic exploration, presenting a theoretical basis for processing and interpreting cross-hole data.

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3-D Crosswell electromagnetic inversion based on IRLS norm sparse optimization algorithms

Cao

et al. 2023

Journal of Applied Geophysics

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3-D Crosswell Electromagnetic Inversion Based on General Measures

Cited by 6 publications

References 42 publications

Long-Distance Crosswell EM Logging of Copper Ore Using Borehole-Surface Current Injection in Slim Holes

Long-Distance Crosswell EM Logging of Copper Ore Using Borehole-Surface Current Injection in Slim Holes

3D Reverse-Time Migration Imaging for Multiple Cross-Hole Research and Multiple Sensor Settings of Cross-Hole Seismic Exploration

3-D Crosswell electromagnetic inversion based on IRLS norm sparse optimization algorithms

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