Characteristics of Tight Dolostone Reservoir and Its Main Controlling Factors in the Submember Ma5₅ of Majiagou Formation in the Western Ordos Basin

Figure 7

Schematic diagram of the formation mechanism of intercrystalline pore-type dolostone reservoir (after [18]) (Pp = primary intergranular pore; Lg = limestone grain; Ecc = early calcite cement; Pd = powdery intercrystalline dolomite; Sp = secondary pore; Sd = fine-crystal dolomite).

(a)

(b)

(c)

(d)