Dip of the Oil(Gas)-Water Interfaces in Anticline-Hydrodynamic Oil(Gas) Pools
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摘要: 基于Hubbert的油(气)等势面坡度与水头关系的公式和达西定律, 推出了油(气)等势面坡度与水流的渗滤速度的关系式.根据此关系式, 讨论了各种情形水流速度与油气等势面坡度的关系.以此为基础, 认为未被油气充满转折端的背斜-水动力油气藏平面的油水界面由于水流速度大小和方向变化通常应该为曲面; 对被油气充满转折端的背斜-水动力油气藏倾斜的油水界面在不同方向剖面上倾斜不同: 圆柱状背斜横剖面油水界线水平、斜向剖面界线倾向相反, 倾伏背斜的横剖面可能同向倾斜但通常不在同一条倾斜的直线上.Abstract: 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. -
图 1 油水界面产状的两种常见认识
a.转折端没有被油充满, 水可以从转折端流过(Levorsen, 1954); b.油充满转折端, 水不能在该横剖面上从转折端流过(李明诚, 1994; 张金亮和常象春, 2004)
Fig. 1. Two common misconceptions of the occurrences of oil-water interfaces
图 2 油等势面(平均)倾角与等厚储层倾角关系示意图
虚线代表油等势面; 箭头线代表水流线
Fig. 2. Schematic sections showing relations of slopes of oil equipotential surfaces to dips of the reservoir layers
图 3 未被油充满转折端的背斜-水动力油藏横剖面上油水等势线分布和油水界线产状
a.没有油气聚集体条件下油等势线(虚线)分布和油气运移方向; b.油聚集体稳定成为背斜-水动力油藏后油水界线产状: 油水界线虽然是油等势线, 但由于油气聚集后, 水流方向和水流速度大小发生局部变化, 导致油等势线发生局部改变, 油水界面是在新的油势(点线)分布中一个等势线
Fig. 3. Oil equipotential lines and the occurrence of oil-water contact in the hydrodynamic-anticline oil pool where the hinge zone is not full of oil
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