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首页> 外文期刊>SPE Reservoir Evaluation & Engineering >The Integration of Capillary Pressures and Pickett Plots for Determination of Flow Units and Reservoir Containers
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The Integration of Capillary Pressures and Pickett Plots for Determination of Flow Units and Reservoir Containers

机译：毛细管压力和Pickett图的集成，用于确定流量单位和储层容器

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This paper shows how to construct lines of constant capillary pressure, process speed, pore-throat aperture, and height above the free water table on a Pickett plot. The integration of these properties allows the determination of flow units and reservoir containers and illustrates the important link between geology, petro-physics, and reservoir engineering. The concept of flow (or hydraulic) units and reservoir containers has been used in the oil industry with a good deal of success during the past few years. The process or delivery speed κ/φ can be used in many instances to define a flow unit. Correlation of flow units between wells helps to establish reservoir containers and forecast reservoir performance. We show that a Pickett crossplot of effective porosity vs. true resistivity should result in parallel straight lines for intervals with constant process speed κ/φ. The slope of the straight lines is related to the porosity exponent m, the water-saturation exponent n, and constants in the absolute permeability equation. From the straight lines, it is possible to determine capillary pressures and pore-throat apertures directly for each flow unit at any water saturation. Pore throats at 65% water saturation compare very well with Win-land r_(35) values. The method has not been published previously in the literature. Building lines of constant κ/φ allows the display of complete capillary pressure curves on the Pickett plot, including regions that are and are not at irreducible water saturation. Previous empirical methods for determining the absolute permeability of a given interval assume that the water saturation is at irreducible conditions. This paper presents a technique that allows us to estimate absolute permeability even if the interval contains moveable water. The use of this technique is illustrated with previously published data from the Morrow sandstone in the Sorrento field of southeastern Colorado and carbonates from the Mission Canyon formation in the Little Knife field of North Dakota. We conclude that flow units can be determined reliably from the integration within one single log-log graph of Pickett plots, capillary pressures, pore-throat apertures, and Winland r_(35) values.
机译：本文展示了如何在Pickett图上构造恒定毛细压力，处理速度，孔喉孔径和自由水位以上高度的线。这些特性的集成可以确定流量单位和储层容器，并说明了地质，岩石物理学和储层工程之间的重要联系。流量（或液压）单元和储油罐的概念已在石油行业中使用，在过去几年中取得了很大的成功。在许多情况下，可使用过程或输送速度κ/φ来定义流量单位。井间流量单位的相关性有助于建立储层容器并预测储层性能。我们表明，有效孔隙率与真实电阻率的Pickett交会图应以恒定的处理速度κ/φ产生平行的直线。直线的斜率与孔隙率指数m，水饱和指数n和绝对渗透率方程中的常数有关。从直线上可以直接确定每个水单元在任何含水饱和度下的毛细管压力和孔喉孔。水分饱和度为65％时的孔喉与Win-land r_（35）值相比非常好。该方法先前尚未在文献中公开。常数κ/φ的构造线允许在Pickett图上显示完整的毛细管压力曲线，包括处于和无法饱和水饱和度的区域。用于确定给定间隔的绝对渗透率的先前经验方法假定水饱和度处于不可约条件。本文介绍了一种技术，即使该间隔包含可移动的水，该技术也可以估算绝对渗透率。以前发表的来自科罗拉多州东南部索伦托油田的Morrow砂岩数据和北达科他州小刀油田的米申峡谷地层碳酸盐的数据，说明了该技术的使用。我们得出结论，可以通过在Pickett图，毛细管压力，孔喉孔径和Winland r_（35）值的单个对数-对数图中进行积分来可靠地确定流量单位。

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