基于低场核磁共振技术的储层可动油饱和度测试新方法
收稿日期: 2014-11-24
修回日期: 2015-07-21
网络出版日期: 2015-09-05
Measuring Movable Oil Saturation in Reservoirs with Low-Field NMR Technology
Received date: 2014-11-24
Revised date: 2015-07-21
Online published: 2015-09-05
在评价储层的可动用储量时，可动油饱和度是重要参考参数之一．为了准确测试储层的可动油饱和度，在借鉴可动流体饱和度测试方法的基础上，提出了通过结合低场核磁共振技术和油驱水、水驱油离心实验来测试可动油饱和度的新方法．选取马岭油田的24块岩样进行了可动油饱和度实验，实验结果表明：2.28 MPa、0.22 MPa分别是低渗砂岩油驱水和水驱油离心实验的合理离心力；24块岩样的可动油饱和度分布为17.06%~60.49%，平均为41.95%；可动油饱和度主要由0.5 mm以上的喉道控制，喉道半径越大，控制的可动油越多；可动油饱和度与渗透率的相关系数达到0.845，要好于与孔隙度的相关性．实验结果较符合目标区块的实际情况，证明了通过该新方法来测试岩心可动油饱和度是可行的，改进了仅根据油相T2谱的左峰和右峰测试可动油饱和度的传统方法．
2 , 3 , 修伟4 , 周尚文1 , 2 , 3* , 薛华庆1 , 2 , 3 , 郭伟1 , 2 , 3 , 李晓波1 . 基于低场核磁共振技术的储层可动油饱和度测试新方法[J]. 波谱学杂志, 2015 , 32(3) : 489 -498 . DOI: 10.11938/cjmr20150310
Movable oil saturation is an important parameter to consider when evaluating movable reserves. Adapted for the method to measure movable fluid saturation, a new low-field NMR method to measure movable oil saturation was developed, and demonstrated through oil-driving-water and water-driving-oil centrifuge experiments. Experiments were conducted on 24 samples from Maling oilfield. The results indicated that the reasonable centrifugal forces for low-permeability sandstone in oil-driving-water and water-driving-oil experiments were 2.28 and 0.22 MPa, respectively. The movable oil saturation was measured between 17.06% and 60.49%, and the average was 41.95%. The movable oil saturation was primarily determined by throat with a size of 0.5 μm, and the volume of movable oil increased with the throat radius. The correlation coefficient between movable oil saturation and permeability was found to be 0.845, higher than the correlation coefficient between movable oil saturation and porosity. The results of these agreed well with the actuality of the formation. It is concluded that the new method for measuring movable oil saturation is valid and practical, and represents significant improvement over the conventional approach.
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