Diagenetic evolution and formation mechanisms of middle to deep clastic reservoirs in the Nanpu sag, Bohai Bay Basin, East China

WANG Enze,LIU Guoyong,PANG Xiongqi,LI Changrong,WU Zhuoya

Table 1 Physical properties of Shahejie Formation reservoirs in the Nanpu sag.

Structural belt Formation Lithology Average porosity/% Permeability/ 10-3 μm2 Reservoir evaluation Pore types Plane porosity/% Gaoshangpu Es3 Feldspathic litharenite and lithic arkose 9.8 0.48 Tight reservoir Mainly secondary pores 6.2 Nanpu No.3 Es1 Lithic arkose 13.4 170.33 Low porosity but medium- high permeability Mainly primary pores 4.6