Abstract:

To reduce the risk of exploration in deep water，and accurately identify the lithologic traps’boundary in the deep zone of Baiyun depression，this paper adopted the method of combining multiple technologies to study the sedimentary lithologic traps’ boundary in deep-water. In the sequence stratigraphic framework and under the control of sedimentary system，the favorable area is targeted, in which lithological traps can form; The forward model is built, which can describe various kinds of sedimentary reservoir faces about the gravity flow in deep water; Making use of the analytical technology of seismic waveform，the reservoirs and non-reservoirs are indentified，and the characterization of channel deposition and filling，the sedimentary fan body inside structure，sand body packing mode of microstructure are finely described; Combination of reservoir inversion and a variety of seismic attributes，the lithological traps’ boundary is further comprehensively identified. The study result summarized the recognizable characters of sand rock lithological traps’boundary about the slope gravity flow channel sand，slope fan，floor fan sandstone in Baiyun deep-water,and it is applied to the exploration practice，then the good exploration results are obtained.

Key words: Baiyun depression, lithological trap, geophysical forward and inversion, deep-water sedimentary, gravity flow channel