WAVE IMPEDANCE INVERSION AND ITS APPLICATION TO THE PREDICTION OF SUBTLE TRAPS

By using wave impedance inversion seismic profiles combined with logging and core data, the sequences of the Qingshankou and the Yaojia Formation in the Songliao Basin were preliminary interpreted, nine sequences and twenty system tracts were identified, and the sequence stratigraphic framework of this region was established. Based on the interpretation of sequence stratigraphy, sedimentary microfacies and structures on wave impedance inversion seismic profiles, five types of subtle traps were found, that is, stratigraphic overlap traps, tectonic-lithologic traps, sandstone updip-pinchout traps, fault-lithologic traps and sandstone lens-shaped lithologic traps. Also, their distribution regularities in sequence stratigraphic framework were summarized.