Abstract: Xiaoji oilfield in the southern Huanghua depression is a typical complex reservoir characterized by high exploration-development level, multiple oil-bearing layers, more faults and complex structure, so it is of greater potentials for rolling exploration. Based on the fine layer calibration, using the 3D fine interpretation techniques of seismic structure, such as multi-way profile display, local magnification of seismic profile, fault test and analysis, chair-like display, time-slicing and 3D visualization, etc., the structure in Xiaoji oilfield has been fine interpreted, finding out a number of new oil-bearing fault blocks, effectively bringing about the incremental reserves and production in this old oilfield.

Key words: Huanghua depression, xiaoji oilfield, complex reservoir, rolling exploration, 3-D fine seismic interpretation, incremental reserves and production