Home > Archive>Volume 95, Issue 6, 2021 >1835-1843. DOI:10.1111/1755-6724.14883
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Hydraulic Fracturing-induced Seismicity at the Hot Dry Rock Site of the Gonghe Basin in China
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This work is funded by a grant from the National Key R&D Program of China (Grant nos. 2018YFB1501803, 2019YFC1804805-4), the National Natural Science Foundation of China (Grant No. 42074178), Chinese Geological Survey projects (Grant No. DD2019135) and the Education Department of Jilin Province, China (Grant No. JJKH20200945KJ). We thank the Chinese Geological Survey for providing the support to install the stations at the site. We would like to thank the ZMAP software package for processing the monitoring data. We would also like to thank the editor for editorial handing and anonymous reviewers for meticulous and insightful reviews.

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    Abstract:

    Hot dry rock is becoming an important clean energy source. Enhanced geothermal systems (EGS) hold great promise for the potential to make a contribution to the energy inventory. However, one controversial issue associated with EGS is the impact of induced seismicity. In August 2019, a hydraulic stimulation experiment took place at the hot dry rock site of the Gonghe Basin in Qinghai, China. Earthquakes of different magnitudes of 2 or less occurred during the hydraulic stimulation. Correlations between hydraulic stimulation and seismic risk are still under discussion. Here, we analyze the hydraulic stimulation test and microseismic activity. We quantify the evolution of several parameters to explore the correlations between hydraulic stimulation and induced seismicity, including hydraulic parameters, microseismic events, b-value and statistical forecasting of event magnitudes. The results show that large-magnitude microseismic events have an upward trend with an increase of the total fluid volume. The variation of the b-value with time indicates that the stimulation experiment induces small amounts of seismicity. Forecasted magnitudes of events can guide operational decisions with respect to induced seismicity during hydraulic fracturing operations, thus providing the basis for risk assessment of hot dry rock exploitation.

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CHEN Zubin, ZHAO Fa, SUN Feng, Lü Hao, WANG Chunlu, WU Haidong, ZHOU Xiaohua.2021. Hydraulic Fracturing-induced Seismicity at the Hot Dry Rock Site of the Gonghe Basin in China[J]. Acta Geologica Sinica(),95(6):1835-1843

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History
  • Received:July 30,2021
  • Revised:November 01,2021
  • Online: December 27,2021
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