Abstract: This paper anatomizes the known reservoirs based on the researches on the outcrops, core samples, drilling, well logs and 3D seismic data, etc., proposes for the first time that the reservoir in Wellblock Shinan-31 is lithological reservoir coming from water channel of gravity current and distinguishes the conglomerate of the bottom of Qingshuihe formation (K1q1) into basal conglomerate and slip glutenite. The two kinds of conglomerates have identified from cores, well logs and seismic profile in this area. Also, this paper takes an example to illustrate the recognition of non-structural reservoirs in terms of combination of geological thought with the techniques of sandcontent matching, 3D visualization and reservoir inversion. Finally, this paper generalizes the thoughts for exploration of non-structural reservoirs in this area by ways of fault ramp, terrace land and gravity current.

Key words: gentle slope depression, lake basin, gravity current water channel, bottom glutenite, 3D visualization, reservoir inversion