Characteristics of Kezilesu Group sandstone reservoirs and factors controlling their development are investigated based on the analysis of routine thin-sections

cast thin-sections

physical property and grain sizes.The results show that the reservoir rocks are dominanted by feldspathic litharenite and lithic sandstones with low porosity and permeability

and the pore types are mainly secondary pores including intragranular dissolved pores

intergranular dissolved pores and micropores.The mercury intrusion curve has high displacement pressure

indicating that the sorting of pore throats is poor and the pore structure feature in small pores and fine throats.The development of Kezilesu Group sandstone reservoirs in Akemomu gas field has strong correlation with grain sizes

debris content and diagenetic compaction

cementation and dissolution.For reservoir rocks were deposited under the control of braided rivers

their quality improves with grain size enlarging

debris content increasing and enhancing of dissolution.On the contrary

compaction and cementation of carbonate

clay and siliceous mineral formed during the post-diagenesis have adverse effects on reservoir rocks.