不同工程流体注入诱发地震因素的相关性分析

Analysis of Seismic Factors Induced by Fluid Injection of Different Engineering

流体注入诱发地震不仅使民众恐慌,对工程本身的安全性也有重要影响。从不同工程种类特征的角度,分析流体注入诱发地震震级的影响因素,通过非线性拟合得到各工程影响因素的相关性强弱,对各类工程的最大影响因素进行探究,并拟合出最大震级求解公式。结果表明,注入流速是废水注入工程诱发地震的最大因素,增强型地热系统(EGS)工程需要控制注入压力,强化采油系统工程(EOR)与注入压力相关性相对较强;废水注入诱发地震的平均震级较大,二氧化碳捕集与封存(CCS)工程平均震级较小。研究结果可为控制流体注入诱发地震的发震概率提供依据。

Fluid injection induced earthquakes not only cause public panic,but also has impact on the safety of projects.The influencing factors of earthquake magnitude induced by fluid injection are analyzed from the perspective of the characteristics of different projects,and the correlation strength of the influencing factors of various projects is obtained through nonlinear fitting.The maximum influencing factors of various projects are explored,and the formula for solving the maximum earthquake magnitude is fitted.The results show that,(a)the injection flow rate is the largest factor for wastewater injection to induce earthquakes,the enhanced geothermal system(EGS)engineering needs to control injection pressure,and the correlation between enhanced oil recovery(EOR)engineering and injection pressure is relatively strong;and(b)the average earthquake magnitude induced by wastewater injection is relatively large,while the average earthquake magnitude of carbon dioxide capture and storage(CCS)project is relatively smaller.The research results will provide a basis for controlling the occurrence probability of fluid-induced earthquakes in engineering.