Abstract: XMAC full wave well log data are of universal application in petroleum exploration and oilfield engineering project. This paper proposed methods of using XMAC well log data for recognition of oil and gas based on study of full wave transit theory, including primary waveform recognition method, compressional/shear wave ratio method and compressional and shear wave decay method for hydrocarbon recognition. And good applied effectiveness has been achieved in the oilfield.

Key words: acoustic logging, oil and gas bearing zone, full wave transit theory, compressional wave, shear wave