|
Itasca's PFC software is used to create a large assembly of bonded particles representing rock that incorporates the large-scale fractures and joints present in the rock mass. The SRM model is then subjected to stress and pore pressure changes expected in the field. The resulting bond breakages observed in the model are interpreted as micro-seismic events. The SRM model can be used to understand the origins of microseismicity measured in the field and to predict how hydraulic fracturing, production and other operational variables directly impact fracture production and behavior. The SRM approach is a significant step forward as it is impossible, at present, to conduct laboratory studies on rock mass samples that include a representative number of large-scale fractures.
Reference
Reyes-Montes, J. M., Pettitt W.S. and R.P. Young (2007) "Validation of a Synthetic Rock Mass Model Using Excavation Induced Microseismicity," submitted 1st Canada-US Rock Mechanics Symposium, May 27-May 31, 2007, Vancouver, Canada
Pierce, M., Mas, D., Cundall, P. and D. Potyondy (2007) "A Synthetic Rock Mass Model for Jointed Rock," submitted 1st Canada-US Rock Mechanics Symposium, May 27-May 31, 2007, Vancouver, Canada
|
Synthetic Rock Mass (SRM) example illustrating fracture growth and coalescence set off by vertical stress relief. Intact rock (green), developing micro-cracks (red), and pre-existing joints (blue) are shown.
Spatial distribution of microseismic events
|
