Abstract:

The lithologies of volcanic reservoirs in a single well in the Changling gas field are recognized by means of thin section analysis,core observation and description,FMI analysis and conventional well log analysis based on BP neural networks and discriminant analysis method.Three volcanic bodies are identified through 3-D seismic analysis,and the velocity of volcanics is achieved by establishing seismic velocity inversion model.A three dimensional lithology model for volcanic reservoirs is constructed by integrating the sequential indicator simulation and the Co-kriging method,and on the basis,laying down a sound foundation for further exploration and development in the gas field.

Key words: volcanic reservoir, lithology identification, imaging logging, velocity inversion, Changling gas field, lithology modeling