用工业CT技术测量储层岩芯饱和度分布

MEASUREMENT OF CORE SATURATION DISTRIBUTION BY USING INDUSTRIAL COMPUTERIZED TOMOGRAPHY

认识储层岩石中含油饱和度及饱和度分布，对驱替机理的深入研究是非常重要的。为了搞清储层岩石在驱替过程中的饱和度分布情况，应用工业ＣＴ技术，提出了一种储层含油岩芯被驱替后的饱和度分布的ＣＴ密度差测量方法。在岩样的同一断面，分别对干岩样、饱和岩样及在驱替后的岩样进行ＣＴ扫描，重建相应的断层图象，测量所建图象的灰度值，计算出相应的密度值，用密度差法计算出饱和度及其分布值。在γ射线工业ＣＴ机“ＣＤ－３００ＢＧ”上对某油田岩样进行了实际测量，获得的结果说明，采用ＣＴ密度差法测量饱和度分布是有效的。该方法与常规驱替法相比较，具有快速、精度高、无损岩样和能模拟地层状态测量等特点，是油田开发、油藏描述和地层评价的一种新的有效方法。

It is of great importance to further study flooding mechanism if the oil saturation and the distribution in reservoir rocks are know. By using industrial computerized tomography, the paper presents a method to measure the density difference of saturation distribution after the displacement of oil-bearing cores. The procedure is on the same section of a core sample, to do scanning to dry sample, saturated sample and displaced sample respectively, then the corresponding section image is rebuilt, and the gray scale value is measured and density value is calculated. Based on the above values, saturation and its distribution can be calculated by Density Difference Method. The authors have conducted a measurement to a rock sample from certain oil field by an industrial computerized tomography CD-300BG with -ray. The result indicates that the CT density difference method is effective to measure the saturation distribution. Compared with ordinary flooding methods, it is faster, more accurate, no damage to rock sample and can simulate formation condition. Therefore, it is a new effective method for oilfield development, reservoir description ad formation evaluation.