1. A method for modeling fracture networks, comprising: receiving a seismic-resolution data set, wherein the seismic-resolution data set represents a subterranean area and was collected by a seismic data collection device; mapping a sub-seismic data set to a portion of the seismic-resolution data set; defining a fractal region of the seismic-resolution data set containing the portion thereof to which the sub-seismic data set is mapped; generating, using a processor, a training image for one or more sub-seismic scale characteristics of the one or more fracture networks of the seismic-resolution data set using the portion of the seismic-resolution data set; and modeling, using the processor, the one or more sub-seismic scale characteristics of the one or more fracture networks of the fractal region of the seismic-resolution data set outside of the portion, using the training image.