Method for predicting volcanic rock facies

Abstract

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.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration and development geophysics, more specifically, the invention relates to a prediction method of volcanic rock facies. Background technique [0002] In recent years, with the deepening of oil and gas exploration in unconventional reservoirs, volcanic rocks have gradually become a new research hotspot in reservoir prediction. Volcanic oil and gas reservoirs are very complex. Volcanic rock oil and gas reservoirs were first discovered in the United States in 1987. So far, volcanic rock oil and gas reserves in the world are mainly concentrated in the United States, Russia, Cuba and some countries in Eastern Europe. In recent years, China has begun to pay more attention to volcanic rock oil and gas reservoirs, and certain reserves have been explored successively. Dagang Oilfield has also been discovered, but the overall exploration and development and related research are still in the prep...

AI Technical Summary

Problems solved by technology

Therefore, the prediction of the spatial distribution of volcanic rocks still needs the help of seismic prediction methods. Seismic attribute prediction is one of the methods. However, it is difficult to distinguish the changes of volcanic rock lithofacies with conventional single seismic attribute analysis. Combined Earthquake Prediction Method

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