The invention relates to a method for predicting
volcanic rock facies, and relates to the technical field of
petroleum exploitation
reservoir engineering. The method comprises the following steps: (1) forward modeling, (2)
seismic attribute extraction, (3) attribute optimization, (4)
volcanic rock facies classification, (5) multi-attribute neural
network pattern recognition and (6) rock
facies prediction, wherein in the step of forward modeling, profile forward modeling is performed on the basis of seismic geologic
horizon calibration; in the step of
seismic attribute extraction,
horizon-oriented seismic attributes are extracted in allusion to a target
horizon, and an attribute time window range is determined; in the step of attribute optimization, seismic attributes reflecting
volcanic rock distribution are optimized, and preprocessing is performed; in the step of volcanic rock facies classification, category classification is performed on the volcanic rock facies according to a
well drilling result; and in the step of rock facies prediction, a plurality of seismic attributes are fused according to neural network parameters acquired by training, and a distribution variation law of the volcanic rock facies in an unknown area is predicted. The prediction method provided by the invention fuses multiple seismic attributes and
well drilling information, overcomes the defect that a single
seismic attribute only partially reflects the lithological combination difference, and can effectively predict
spatial distribution of the volcanic rock facies.