大地测量与地球动力学2024，Vol.44Issue(9)：905-909,936,6.DOI:10.14075/j.jgg.2023.11.141
马头营干热岩开采试验场地人工注水诱发地震探讨
Study on Earthquakes Induced by Artificial Water Injection in Matouying Dry Hot Rock Mining Test Site
摘要
Abstract
Based on the seismic observation data of 7 temporary seismic stations in the hot dry rock area of Matouying and the pressurized water injection data of M1 well from 2022-06 to 09,we study the relationship between seismic activity,water injection pressure and water flow;we further study the focal mechanism of in-duced earthquakes and analyze their influence on the surrounding stress field.The results show that 201 earthquakes may be induced by water injection operation,and the focal depth is mainly concentrated in 0-4 km.This area is also a safe area with small ground confining pressure,and the probability of moderate and strong earthquakes is small.The changes of water flow and water pressure not only affect the temporal and spatial distribution characteristics of induced earthquakes,but also affect the frequency of seismic activity.When the stress accumulates to a certain level to induce earthquakes,the water flow,water pressure and earthquake frequency show a positive correlation.The relationship between the amount of water injected and the earthquake magnitude is not obvious,and the pressure is linearly correlated with the induced earthquake magnitude.When the continuous water injection volume reaches 11 821 m3 and the pressure reaches 23.46 MPa,the fault instability may induce earthquake.The focal mechanism of the maximum induced earthquake is strike-slip type,and the principal compressive stress is NNW,which has a certain deviation from the stress distribution in North China.It can be seen that the mining of M1 well has an effect on the local stress distri-bution.According to the migration rule of earthquake epicenter,there are new ground cracks.关键词
加压注水/诱发地震/震源机制解/应力场/马头营干热岩区Key words
pressure waterflooding/induced earthquakes/source mechanism solution/stress field/Matouying dry hot rock area分类
天文与地球科学引用本文复制引用
王宁,王亚玲,张晓刚,尹康达,毛国良,纪春玲..马头营干热岩开采试验场地人工注水诱发地震探讨[J].大地测量与地球动力学,2024,44(9):905-909,936,6.基金项目
河北省地震科技星火计划(DZ2023120900003). The Spark Program of Earthquake Technology of Hebei Province,No.DZ2023120900003. （DZ2023120900003）
