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Article

Time-Domain Electromagnetic Instrument for Onshore and Offshore Petroleum Resource Prospecting

by
Qingle Zhang
1,2,
Zhiqiang Li
2,*,
Guangming Li
3,
Jigen Xia
2,
Fangong Li
2,
Kegong Huang
2,
Xiaodong Yang
1 and
Xiaoping Wu
1,*
1
School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China
2
China Research Institute of Radiowave Propagation, Xinxiang 453000, China
3
School of Physics, Henan Normal University, Xinxiang 453007, China
*
Authors to whom correspondence should be addressed.
J. Mar. Sci. Eng. 2026, 14(5), 407; https://doi.org/10.3390/jmse14050407
Submission received: 29 January 2026 / Revised: 16 February 2026 / Accepted: 19 February 2026 / Published: 24 February 2026
(This article belongs to the Topic Advanced Technology for Oil and Nature Gas Exploration)
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Abstract

Currently, marine and land oil resources have entered the high-water extraction stage. The remaining oil is dispersed, and the oil–water relationship is complex, making it increasingly difficult to extract. However, traditional electrical logging techniques are limited by the shielding effect of highly conductive steel casing, rendering them unsuitable for formation resistivity measurement in casing wells. Time-domain electromagnetic method overcomes the constraints of downhole push-off systems and casing conditions, enabling continuous measurement and acquisition of formation resistivity parameters. To overcome these limitations, this paper proposes an active compensation method based on differential measurements between specially configured coils, enabling the early response of the formation to be identified, the method enhances weak signal detection capabilities in casing formations. The coils offset part of the casing influence, while the casing background serves as baseline information. A time-domain electromagnetic instrument for metal casing resistivity measurement was developed, along with a ground water tank resistivity calibration device. The experimental results show that the instrument can effectively suppress casing response, obtain formation resistivity signals, and provide effective guidance methods for measuring formation resistivity of casing wells in the ocean and land.
Keywords: time domain electromagnetic; formation resistivity; marine oil resources; compensation coil; calibration device time domain electromagnetic; formation resistivity; marine oil resources; compensation coil; calibration device

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MDPI and ACS Style

Zhang, Q.; Li, Z.; Li, G.; Xia, J.; Li, F.; Huang, K.; Yang, X.; Wu, X. Time-Domain Electromagnetic Instrument for Onshore and Offshore Petroleum Resource Prospecting. J. Mar. Sci. Eng. 2026, 14, 407. https://doi.org/10.3390/jmse14050407

AMA Style

Zhang Q, Li Z, Li G, Xia J, Li F, Huang K, Yang X, Wu X. Time-Domain Electromagnetic Instrument for Onshore and Offshore Petroleum Resource Prospecting. Journal of Marine Science and Engineering. 2026; 14(5):407. https://doi.org/10.3390/jmse14050407

Chicago/Turabian Style

Zhang, Qingle, Zhiqiang Li, Guangming Li, Jigen Xia, Fangong Li, Kegong Huang, Xiaodong Yang, and Xiaoping Wu. 2026. "Time-Domain Electromagnetic Instrument for Onshore and Offshore Petroleum Resource Prospecting" Journal of Marine Science and Engineering 14, no. 5: 407. https://doi.org/10.3390/jmse14050407

APA Style

Zhang, Q., Li, Z., Li, G., Xia, J., Li, F., Huang, K., Yang, X., & Wu, X. (2026). Time-Domain Electromagnetic Instrument for Onshore and Offshore Petroleum Resource Prospecting. Journal of Marine Science and Engineering, 14(5), 407. https://doi.org/10.3390/jmse14050407

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