MULTI-FRACTURING IN GEOTHERMAL RESERVOIR AND INDUCED SEISMICITY USING PARTICLE BASED, DISCRETE ELEMENT-FRACTURE NETWORK MODEL

摘要

This paper presents discrete element fracture network model designed to simulate multi-stage hydraulic fracturing and induced seismicity in crystalline fractured rock mass at great depth. A series of fluid injection in consecutive way at three wells separated by 500 meter distance with constant rates are simulated. Results are compared which include: (i) spatiotemporal distribution of induced events, (ii) influence of injection rates and overall stimulated pattern, (iii) changes of stress states and maximum compressive stress directions around the injection points. Aim of this numerical study is to get ideas how the hydraulic fracturing operation should be designed for successful outcome of multi-stage hydraulic fracturing.