Tertiary basins in Eastern China are mostly consisted of half-grabens

each of them can be subdivided into three tectonic zones

i.e.escarpment

deep sub-sidence and shallow slope.Along the slope

there are many faults varying in strikes and dips

formed at different times.Normal faults which dip antithetic to the basement(Pre-Tertiary)surface are often accompanied by draping structures

other swhich dip in the same direction as the basement are commonly accompanied by reverse drag structures.Up dip of the slope

sediments in the basin become progressively thin

with overlap

offlap and unconformity quite developed.Sand bodies often pinch out in various directions toward argillaceous rocks.In res-ponse to the not deeply buried basements connected with antithetic normal faults as shown in Fig.1 of this paper

stair-faulted blocks were formed

and inevitablly

structural

stratigraphic-lithologic traps are well developed along slope zones constituting an important oil and gas zone.Ten types of oil/gas pools are revealed

they are related to reverse drag structures

drape structures

faulted blocks

stratigraphic overlaps

stratigraphic uncomformities

buried hills

updip pinch-out of sandstones

fault-truncated sandstones

sandstone lens and proper carbonates.Types and enrichment of petroleum depend mainly on features of the slope.They are divided into three types according to their sedimentary blanket andtimes of formation

namely:稤epositional slope

the slope status of its basement exists prior to its suc-cessively overlapping sedimentary blanket.稴tructural slope

the tilting of its basement occurred after the sedimentation of its blanket

the thickness of the later is therefore almost uniform.稴edimento-structural slope

the basement surface tilted originally

but the filting strengthens gradually during the sedimentation of its blanket

within the later

onlap

offlap and erosion surfaces are common. Among them

the latter is of greater importance and possesses most of pool-types.