Abstract
Hutubi underground gas storage (UGS), as the largest UGS in China, operates periodically by performing gas extraction in winter and injection in summer every year. To detect and study the geomagnetic anomalies that may be caused by gas pressure changes in a controlled manner due to the injection and extraction of gas, repeat measurements of geomagnetic total intensity were conducted across the UGS area. We calculated and analyzed the geomagnetic anomalies in the UGS area using data from two field surveys conducted from July to October in 2018. The fourth-order Taylor polynomial model (TPM) could best describe the background field of geomagnetic in the UGS area. Relative variations in the local geomagnetic field (LMF) above the UGS field ranged from –2.5 to 4.1% during gas injection. The complex anomaly pattern in the high-density array is similar to the piezomagnetic field calculated by the Mogi model. This paper attempts to provide a method to determine the regional geomagnetic anomalies on a small scale.
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ACKNOWLEDGMENTS
We thank the Geomagnetic Network of China for providing the geomagnetic field data for the analysis of geomagnetic secular variations. We also thank the Cooperative Institute for Research in Environmental Sciences for providing the Earth Magnetic Anomaly Grid data.
Funding
This study was funded by the Special Fund of the Institute of Geophysics, China Earthquake Administration (grant number DQJB16B04) and the National Key Research and Development Program of China (grant number 2018YFC1503305).
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Zhendong Wang, Wang, C. & Dong, C. Analysis of Changes in Magnetic Anomalies in the Largest Underground Gas Storage Area in China. Geomagn. Aeron. 61, 1251–1262 (2021). https://doi.org/10.1134/S0016793221080211
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DOI: https://doi.org/10.1134/S0016793221080211