1. A method for identifying seismic facies in a volume of seismic data, comprising the steps of: (a) calculating a plurality of initial textural attributes representative of the volume of seismic data; (b) constructing a probabilistic neural network from the calculated initial textural attributes; (c) calculating facies classifications in a portion of the volume of seismic data; (d) repeating steps (a) through (c) until the calculated facies classifications in the portion of the volume of seismic data are satisfactory; and (e) calculating facies classifications throughout the volume of seismic data using the constructed probabilistic neural network.