Reservoir characteristics within the Devonian sequence stratigraphic framework in the southern Guizhou-central Guangxi region

Eight sequence boundaries are recognized for the South Guizhou depression and Central Guangxi depression,including two supersequences(second-order sequences) SS1 composed of lowstand systems tract(LST),transgressive systems tract(TST) and highstand systems tract(HST),and SS2 composed of transgressive systems tract(TST) and highstand systems tract(HST).The reservoir rocks within the above-mentioned sequence stratigraphic framework consist of organic reef(bank) reservoirs,dolostone reservoirs and fissure-type reservoirs.The favourable reservoir rocks include the organic reef(bank) limestone reservoirs in the transgressive systems tract,organic reef(bank) limestone reservoirs and dolostone reservoirs in the highstand systems tract.