The formation and evolution of Lanliao fault belt in Dongpu Depression may be divided into two periods and five stages such as Mesozoic and Cenozoic Periods

and compression

iniital fracture

strong fracture

shrinkage and after vibration stages.Hydrocarbon trap types in Lanliao fault belt are various.According to oil and gas geological feature

the location of traps

the screening condition and the occurrence

the trap types could be divided into eight kinds

i.e.the nose structure

half-anticline

the upwarping lithologic trap

buried-hill trap

stratigraphic unconformity trap

the reef trap

the paleochannellithological trap and the nappe structural trap.Rich oil and gas source

favourable hydrocarbon migration conditions

the multi-passage

the subaqueous fan sandbodies and structure-controlling are the major factors of hydrocarbon accumulation.