DIAGENESIS IN THE CARBONIFEROUS IN NORTH CHAO COUNTY OF ANHUI PROVINCE

The main diagenesis of carbonate rocks in the studied area includes micritization,cementation,compaction-pressure solution and dissolution,Jiming Formation and the lower part of Hezhou Formation are dominated by micritization and strong compaction,the upper part of Hezhou Formation,Huanglong Formation and Chuanshan Formation by pressure solution and intense meteoric cementation,and the detrital rock of Gaolishan Formation by compaction and dissoluion.Pores resulted from multistage dissolution in the middle and upper parts of Hezhou Formation was well-developed,and the porosity is up to 14.38%.They will become potential reservoirs of the studied area.