One Dimensional Numerical Simulation of Oil-Trapping Process of Original Lentoid Sand Reservoir
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摘要: 为了了解原生透镜状砂岩油藏的成藏过程和控制因素, 基于变形多孔介质两相流动的基本原理, 综合考虑地层在沉降过程中温度和压力的变化、砂岩体和围岩物性的变化、石油的生成以及岩石中孔隙流体物性变化等情况, 应用数值方法模拟这类油藏在一维条件下成藏的整个过程.通过成藏过程模拟和分析, 认为超压是推动流体整体运移的动力, 而对处于生油围岩中的原生透镜状砂岩油藏, 围岩和砂体间形成的毛管压力差异才是驱动石油在原生透镜状砂岩油藏中聚集的根本动力.在这类砂岩油藏成藏的过程中, 砂体的油相压力要低于与其相邻的围岩中的油相压力, 使得砂体成为石油的一个相对的低势区.原生透镜状砂岩油藏的成藏是由力平衡和物质平衡两种基本作用控制的成藏过程, 石油生成和供应量以及砂体和围岩的油相势差决定了这类油藏的含油性.Abstract: To find out the mechanism and controlling factors of the original lentoid sand reservoir, its oil-trapping process is numerically simulated on one dimensional condition based on the theory of two-phase fluid flow in compactable porous media, taking into account of its various related processes and parameters. It is ascertained that overpressure is the force of gross fluid flow out of the source rock rather than the force of oil accumulation in the lentoid sand reservoir. The fundamental force for oil accumulation in the lentoid sand reservoir is the difference of capillary pressures built up between the source rock and the reservoir. The potential of oil phase in lentoid sand reservoir is less than that in the surrounding source rock in the oiltrapping process. The oil trapping process of lentoid sand reservoir is controlled by the principles of potential balance and volume balance. The oil-bearing characteristics of the reservoir are determined by the oil volume provided and the oil phase potential difference between the source rock and the reservoir.
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图 2 目的层段含油饱和度(a)和毛管压力(b) 随时间变化
Fig. 2. Oil saturation varied (a) and capillary pressure varied (b) with time in the simulative section
图 3 目的层段油势梯度随时间变化
Fig. 3. Oil potential grads varied with time in the sirrndative section
图 4 牛庄洼陷原生岩性油藏含油性影响因素统计分析
a.油藏储层孔隙度与含油饱和度关系；b.油藏异常压力系数与油藏顶部储层毛管压力关系
Fig. 4. Statistical analysis of the influential factors on the oil-bearing characters of original lentoid sand reservoirs in Niuzhuang sag
表 1 成藏模拟中用到的各参数
Table 1. Parameters used in the simulation
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