Abstract: The great breakthrough has been made in Tahe oilfield in recent years for Triassic lithologic reservoir exploration. The complex trap of upper oil measure in Akeyasu-2 well and the lithologic trap of channel sand body of middle oil measure in southern Tahe oilfield were found, on which Well AT2 and Well YT2, etc. were drilled and commercial oil-gas flows were gained, revealing a good prospect for Triassic lithologic reservoir exploration. This paper presents the identification and evaluation of the Triassic lithologic traps in Tahe oilfield based on the combination technologies such as sequence stratigraphy, sedimentary microfacies study, petrophysical properties, forward modeling, seismic attribute, waveform analysis, 3D visual seismic interpretation, seismic inversion, sand thickness prediction and oil-gas detection, etc.

Key words: Tahe oilfield, Triassic, lithologic trap, identification, evaluation