Five different kinds of basins in Permian System in SichuanGuizhouGuangxi region contain different stratigraphic sequences

so their hydrocarbon prospects are different.In general

transgressive system tracts(TST)

condensed section(CS)

highstand system tracts (HST)and lowstand system tracts (LST) of platform basin

deepwater basin and coalbearing carbonate formations of highstand system tract in cratonic basin and isolated carbonate platform are generally important source rocks and significant cap rocks .They include all kinds of favourable sandbodies in different system tracts:1.basin-floor and slope fans

delta front

alluvial fan

channel sandbodies

progradation complex

shoal-bioherm-reef complex

calcareous and mixed clastic turbidites within lowstand system tract;2.sandbodies of barrier beach

shoal

estuary

tide-controlled delta

fandelta

turbidity fan

lag sediment

bioherm-reef complex

pyroclast turbidite within transgressive system tract;3.river and wave dominated deltaic sandbodies

alluvial fan-channel sandbodies

fan-delta

turbidity fan

terrigeneous and carbonate shoals

bioherm-reef complex

calcareous-clastic beach-bioherm-reef complex

calcareous clastic turbidite and dolostone within highstand system tract;4.paleo-karst reservoir dominated by sequence boundary.