Characterization of water flooded layers of alluvial fan reservoirs in China Xinjiang oil field
Liang Zhao, Lidan Ji
COMPUTER MODELLING & NEW TECHNOLOGIES 2014 18(12D) 168-173
Research institute of Petroleum Exploration & Development, Beijing, China
Alluvial fan reservoirs have strong heterogeneity, which would result in complicated remaining oil distribution in mid-late water injection development stage of oilfield. To assess the flooding degree of water flooded layers and find out the remaining oil distribution law are important and difficult in oil field developing adjustment. The paper took Kexia formation reservoirs in Xinjiang oil field for example, and on base of establishing the criterion of identification of water flooded layers, the reservoir flooding degree and features were analysed. The remaining oil distribution model of alluvial fan reservoirs were divided into 4 categories: injection-production without corresponding, oil layers on top, interface barrier type and lenticular type. The effect of sedimentary facies to remaining oil distribution was concluded: the middle fan reservoirs are the main target of tapping potential, interbeded of multi-period braided river distributary channel deposition and sheetflood fine particle deposition, which has strong heterogeneity and result in low swept volume of displacement of oil by water. And their distribution models mostly are layers on top type and interface barrier type.