Microseismic Monitoring of Active Fracture Zones as an Instrument of Forecasting the Disjunctive Break and Deconsolidation Zones at the Mines

For the first time at the oil mines of Yarega, microseismic monitoring of active natural fracture zones has been conducted on the areas of mining operations, planned for the period 2018–2020 for the purpose of assessment of microseismic activity in a planned depth interval of the penetration of mining, highlighting areas with the largest microseismic activity, mapping the preferential directions of fracture and prediction of the position of the fractures and deconsolidation zones associated with disjunctive breaks. The result is maps of the intersection of project mining with the predictive discontinuous (disjunctive) faults according to microseismic monitoring given the project depth marks of mining and the allocation of areas of possible caving with the ranking according to risk (low, medium, high). The coincidence of position of prospective disjunctive breaks and areas of risk of caving according to the microseismic monitoring results with actual complications recorded during mining allows claiming about the possibility of prediction of complications before carrying out mining operations on oil mines on the basis of microseismic monitoring. Microseismic monitoring of active zones of natural fracturing may be used for the design of mining operations and events in the process of mining with for the purpose of preventing emergencies and reducing the risks of caving.