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基于低场核磁共振技术的储层可动油饱和度测试新方法

DOI: 10.11938/cjmr20150310, PP. 489-498

Keywords: 核磁共振(NMR),可动油饱和度,最佳离心力,油驱水,水驱油

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Abstract:

?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:2.28MPa、0.22MPa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0.5mm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.

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