Abstract:

The measured monogenetic temperatures of organic inclusions in the fissures of mudstones in Shiwu Faulted Depression,Southern Songliao Basin Were 97.6℃,106℃, 122℃ and 168.8℃ respectively.This indicates that at least four periods of hydrocarbon expulsion took place.The reservoirs in the fault-depressde basin contain rich inclusions which are mainly in gas phase.But certain amount of oil inclusions could be found in Shiwu and Fulongquan Faulted Depressions.The monogenetic temperatures of the inclusions in the Shiwu Faulted Depression Were 70-80℃,90-110℃ and 120-140℃,which reflected three hydrocarbon migration and accumulation stages.The characteristics of the inclusions of Shiwu and Fulonguan Faulted Depressions Were similar. Liutiao Faulted Depression, hower, had fewer periods of hydrocarbon migration and accumulation, the monogenerous temperatures wre primarily 120-140℃.The abundance,type and distribution of organic inclusions of different depressions suggest that Shiwu Faulted Depression is active in hydrocarbon migration and accumulation and has good oil and gas prospects,lateral migration is its major migration manner;Fulouguan Fanulted Depression is secondary in hydrocarbon migration and accumulation,with vertical migration as its main manner;hydrocarbon migration and accumulation of other depressions are relatively weak but possess good gas exploration prospects.