The Oil-water Inverted Mechanism Analysis For Liu58 Buried Hill Reservoir, Central Hebei Depression

The Liu58 buried hill located central south of raoyang depression existed in Central Hebei Basin, the formation 4004m buried depth. In place of wobei - HeJian subsags is a rich oil subsags for peripheral reservoirs provide oil source.the ancient Jxw dolostone stratum, the region is the qianshan reservoir important high quality reservoirs, The Liu58 buried hill has good accumulation conditions. In order to mining of remaining oil potential, According 3d seismic data to Implement structural for structural high site deployment development Wells Continuous 3 Wells try oil out of the water. This 3 Wells in tectonic center, think there oil-water inverted phenomenon.From reservoir pressure system, hydrocarbon showing distribution, production rule, formation water properties, fracture development situation analysis, Think Liu58 buried hill reservoir is a low permeability-tight reservoir, is in the complex geological formation, under the action of reservoir with dense, through the special reservoiring mechanism control,For example lagging effect and Dynamic trap Control generated the special trap mechanism generated oil-water inverted reservoirs.Through the production Wells of tectonic high position reservoir crack fillings analysis, Think reservoir and the lower strata of igneous contact, Cause top reservoir density.So in the central part of the layer tectonic formation interlayer conditions. interlayer is a cause of oil-water inverted reservoir another important reasons.Through production comparison, think buried hill reservoir low structure existing water injection water flooded. Comprehensive analysis thinks, Liu58 buried hill reservoir oil-water inverted phenomenon caused by water injection and reservoir-forming mechanism. In the production process, the Coexisting phenomenon performance complex water-oil relations.