Factors controlling the development of tight sandstone reservoirs in the Huagang Formation of the central inverted structural belt in Xihu sag, East China Sea Basin

XU Fanghao,XU Guosheng,LIU Yong,ZHANG Wu,CUI Hengyuan,WANG Yiran

Fig. 3. Pore characteristics of the Huagang Formation reservoir in the study area. (a) Residual intergranular pores after compaction, Well X3, 4 061.9 m, 10×10(-); (b) Preserved primary intergranular pores after chlorite ring precipitation, Well X2, 3 761.4 m, 20×10(-); (c) Intergranular dissolved pores, Well X3, 3 850.4 m, 10×10(-); (d) Moldic pores of feldspar, Well X3, 3 857.6 m, 10×20(-).