Liaohe Beach starts from Hulu Island in the west and ends at Boyuquan in the east.The principal hydrocarbon source rocks are Sha-3 member and the reservoir rocks are Sha-1 member.According to the geological

geophysical and geochemical data of the beach area as well as some parameters of its neighbouring area

a simulation of hydrocarbon generation and expulsion was wade.The results suggest that the principal source rocks are Sha-3 member

and secondly Sha-1 and Sha-2 members;Gaizhoutan

Hainan and Qiugshui Sags are main hydrocarbon generation centres

and Hainan Subsag and the south of Jinzhou 9-3 Subsag are secondary.It is also suggested that the east sag of the simulated area is mainly oil-bearing type and the west sag is mainly gas-bearing type.Major hydrocarbon genention stage started from Dongying period

the peak period of hydrocarbon expulsion started from Dongying 1～2 stages.Hydrocarbon generation centres coincided with hydrocarbon expulsion centres.\;