Abstract: The lithology recognition of volcanic rocks is the foundation of the lithofacies division,reservoir synthetic evaluation and forecast,well pattern deployment and establishment of developing plan.Volcanic rocks have various types,their lithologies related to their ingredients and structures.So it is very difficult to recognize their lithologies.Mechanical parameters of rocks are rich in characterization of lithologic information,providing a lot of volcanic lithologic data.This paper takes the carboniferous volcanic rocks in Junggar Basin District69 for example.The rock mechanic parameters of 40 core samples are tested in the area,and the Poisson′s ratio,Young′s modulus,bulk elasticity modulus which are very sensitive to the volcanic rock lithology are optimized.Based on the three parameters of rock mechanics the lithological identification plate is established.At the same time,the model of Poisson′s ratio,Young′s modulus,bulk elasticity modulus which are calculated by using logging data are given,so that the identification of lithology of the volcanic rocks in the work area are calculated point by point.The recognition result indicates that this method can recognize lithology accurately in this work area.The recognition rate is fully capable of meeting the requirements of reservoir evaluation.

Key words: rock mechanics, volcanic rock, lithology, recognition, well logging