Abstract:

The Jiufutang Fuxin Formations could be divided into MSC1, MSC2 and MSC3 medium term base level cycles, among them MSC2 and MSC3 are elevated semi-cycles.These three cycles correspond well to S_A,S_B and S_C recorded in seismic sections.Accordimg to well drilling and seismic data,the marsh coal-bed in fan-delta front and shallow lake mudstone of MSC1 and the flood dark mudstone of MSC3 are most favourable source rocks;fan-delta front subfacies and subaqueous medium fan subfacies of every cycle are good reservoir facies.It is suggested that the middle and upper parts of MSC3 and MSC1 elevated semi-cycles should be taken as the main exploration sequences.

Key words: sequence stratigraphy, base-level cycle, reservoir prediction, Changtu Depression