Time-Lapse Reflection Seismic Monitoring for Longwall Caving Assessment
B. Zhou, H. Guo, Q. Qu and L. Yuan
Event name: 80th EAGE Conference and Exhibition 2018
Session: Near Surface - Mining Geophysics
Publication date: 11 June 2018
Info: Extended abstract, PDF ( 671.14Kb )
Price: € 20
the floor. This will assist design and planning of effective longwall support and goaf gas drainage systems, and allow assessment of the mining impact on surface water and groundwater systems. To achieve this, we have conducted time-lapse reflection seismic surveys at Zhuji Coal Mine in Huainan, China. Based on the characteristics of seismic events from these seismic surveys, it is demonstrated that time-lapse seismic surveying could be used for characterizing longwall caving effects. The prolonged reflections at both sides of the longwall panels match well with the numerical geomechanical modelling results in terms of the stress and permeability distributions of the overburden after mining, and provide a geophysical confirmation of the geotechnical conceptual model – the annual overlying zone for optimum gas drainage. In addition, the seismic data can also help to define the caving, fracture and subsidence zones of the overburden.