Characteristics and formation mechanism of the Triassic Feixianguan Formation reservoir in Longgang Gas Field，Sichuan Basin
Zhu Haihua1,2, Zhong Dakang1,2
1 College of Geosciences，China University of Petroleum(Beijing)，Beijing102249;
2 State Key Laboratory of Petroleum Resource and Prospecting，China University of Petroleum(Beijing)，Beijing102249
Based on analyses of the cores，casting thin sections，porosity and permeability data as well as log data，this work summarises the carbonate reservoir characteristics of the Triassic Feixianguan Formation in Longgang Gas Field，Sichuan Basin.The research shows porous and permeable reservoirs are mainly dolostones，especially oolite dolostone，which are preliminary considered to be formed by dolomitization short after deposition(supposedly dorag dolomitization).Combined with regional geology data，the research suggests that the relative sea level fell in oscillation during the Feixianguan Age，which had important control on early stage dolomitization and two cycles of dolomitization formed in the perpendicular direction: each lower part of the Member 2 and 3 of Feixianguan Formation，where reservoirs with high quality developed.
Zhu Haihua,Zhong Dakang. Characteristics and formation mechanism of the Triassic Feixianguan Formation reservoir in Longgang Gas Field，Sichuan Basin[J]. JOPC, 2013, 15(2): 275-282.
