(Peer-Reviewed) Hydraulic Fracturing-induced Seismicity at the Hot Dry Rock Site of the Gonghe Basin in China
CHEN Zubin 陈祖斌 ¹ ², ZHAO Fa 赵发 ¹ ², SUN Feng 孙锋 ¹ ², LÜ Hao 吕昊 ¹ ², WANG Chunlu 王春露 ¹ ², WU Haidong 吴海东 ³, ZHOU Xiaohua 周晓华 ¹ ²
¹ College of Instrumentation & Electrical Engineering, Jilin University, Changchun 130026, China
中国 长春 吉林大学仪器科学与电气工程学院
² Key Lab of Geo-Exploration Instrumentation of the Ministry of Education, Jilin University, Changchun 130026, China
中国 长春 吉林大学地球信息探测仪器教育部重点实验室
³ Center for Hydrogeology and Environmental Geology, China Geological Survey, Baoding, Hebei 071000, China
中国 河北 保定 中国地质调查局水文地质环境地质调查中心
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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