Abstract: With the continuous petroleum exploration in Junggar basin, lithologic trap's exploration becomes the focal point of work in the days to come. How to make an identification, prediction and description of the lithologic traps is a problem to be urgently solved. This paper presents the studies of A67 Wellblock in Xiazijie area as a target zone using sequence stratigraphy theory, integrated with the drilling data and sedimentary facies analysis, including formation correlation, layer division, sand body selection, seismic attribute extraction and seismic facies identification, etc. The study indicates that there exist several sand bodies in Lower Karamay formation of A67 Wellblock. This provides an effective method for identification of the lithologic traps in this area.

Key words: Junggar basin, Triassic, Lower Karamay formation, formation correlation, seismic attribute, sedimentary facies, sand body