Abstract：Based on 3-D high-precision seismic data in northwest part of Be'er sag, Haila'er basin and through analyses of seismic attributes in time and frequency domains, the paper studied the variation and distributing law of channel sand bodies and summarized a set of approaches using seismic attributes in time and frequency domains to identify the palaeochannel. Among these attributes, the horizons following attributes sensitive to channel sand body mainly include mean-square-root amplitude, gradient of reflection intensity, effective bandwidth and instantaneous frequency. The underwater split-flow channel sand body and river mouth bar sand body have been found by using this identifying approach, which provided concrete objects for deployment of lithologic exploration in this region.
