天津典型观测井渗透性变化及对玛多7.4级地震响应机理分析

doi:10.12196/j.issn.1000-3274.2024.02.003

Abstract

Abstract: This article uses two methods, slug test and tide inversion, to calculate the permeability coefficient of Wang 3 Well, Baodi New Well, and Ninghe Well at different periods. Comparing the calculation results, we find that the results obtained by using two methods are comparable in overall magnitude, and the trend of change is consistent. Especially for observation wells in aquifers with stable development and good continuity, the calculation results of the two methods are closer. The permeability coefficient estimated by slug test mainly reflects the permeability characteristics of the local aquifer around the wellbore during the short-term water flow process. The permeability coefficient estimated by tide inversion reflects the average permeability of a large range of aquifers over a long period of time. Therefore, in the analysis of coseismic response and abnormal verification of water pumping (injection) interference, using slug tests to estimate the permeability coefficient of the well aquifer is more reasonable, and it is more reasonable to use tide inversion to estimate the permeability coefficient in analyzing regional stress field changes. We analyze the characteristics and causes of water level and permeability change characteristics and causes of the three observation wells, as well as, we mechanism of water level coseismic response in Wang 3 Well and Baodi New Well to the Maduo M7.4 earthquake in Qinghai Province on May 22, 2021, and the impact mechanism of the Maduo earthquake to water level in Ninghe Well. We find that factors, such as stress accumulation, pumping or injection water, and seismic wave propagation, can affect the permeability of aquifer medium. Moreover, the propagation process of seismic waves has different impacts on different aquifer medium, and the response characteristics and mechanisms of observation wells with the same aquifer lithology to the same earthquake are also different.

Key words: Permeability coefficient, Slug test, Tide inversion, Coseismic response, The 2021 Maduo M_S7.4 earthquake

CLC Number:

P315.7

LI Yue, LIU Zhen-hui, MA Han-yu, WANG Yi-xi, SHAO Yong-xin. Permeability Changes of Tianjin Typical Observation Wells and Coseismic Response Mechanism to Maduo M_S7.4 Earthquake[J]. EARTHQUAKE, 2024, 44(2): 33-51.

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Permeability Changes of Tianjin Typical Observation Wells and Coseismic Response Mechanism to Maduo M_S7.4 Earthquake

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Permeability Changes of Tianjin Typical Observation Wells and Coseismic Response Mechanism to Maduo MS7.4 Earthquake

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Permeability Changes of Tianjin Typical Observation Wells and Coseismic Response Mechanism to Maduo M_S7.4 Earthquake