Dip of the Oil(Gas)-Water Interfaces in Anticline-Hydrodynamic Oil(Gas) Pools

On the basis of the Dacy Law and the formulae proposed by Hubbert(1953) for the relationship between dips of oil-water and gas-water contacts in the oil and gas pools under hydrodynamic conditions and hydrodynamic heads, this paper proposes formulae of the relationship between dips of contacts and the waterflow seepage velocity. With the formulae, the paper discusses the possible relationship between the water seepage flow velocity and the slopes of oil(gas)equipotential surfaces. Based on the discussion, the paper concludes that the oil-water contacts in the hydrodynamic-anticline pools where hinge zones are not full of oil commonly are curve surfaces. For hydrodynamic-anticline pools where hinge zones of anticlines are full of oil, their oil-water contact lines in two limbs along cross sections of the cylinder anticlines are horizontal. Those along oblique sections of the cylinder anticlines are reverse; those along cross sections of the plunge anticlines might have the same dips but the two lines usually are not located in the same tilt straight line.