3D AVO analysis for identifying thin continental sandstone interbeds and deep volcanic rocks

AVO characteristics were ambiguous in thin-layer interbed sandstones and mudstones of terrestrial facies of Daqing area. Described in this paper is the 3D AVO analysis and real examples in the Sorigzhan region in the north of the Songliao basin. The AVO responses of the Fuyu sandstone reservoir, obtained through special AVO processing and interpretation as well as the AVO forward modeling under the constraints of logging data, were evident in the Sheng-81 well. It was concluded that the Fuyu sandstone reservoir presented an AVO anomaly of “amplitudes increasing with offsets”. At the same time, the deep volcanic reservoirs were ascertained and the channels of volcanic eruption were delineated at the intersections of faults in Sanzhao area, through a 3D AVO analysis, which coincided with the theory of geodynamics and tectonophysics.