核磁共振录井含油饱和度的测量与校正

Measurement and correction for oil bearing saturation in nuclear magnetic resonance logging

含油饱和度是评价油田储集层好坏的重要参数之一,核磁共振录井测量含油饱和度的方法简单方便,所需时间短,解决了目前其他测量含油饱和度方法所需周期长、工艺复杂的问题。针对含油饱和度的求取进行了深入分析,选择以质量浓度15 000 mg/L为标准来配置MnCl_2溶液,并确定了一系列含油饱和度浸泡时间等相关参数,分析了含油饱和度校正的理论依据及方式。经过多次的现场试验发现,增加对岩样原始状态的测量可以确定出岩样油气水损失量,提出了三次测量法,该方法可以有效校正核磁共振测定的含油饱和度,现场应用情况表明效果良好。

The oil bearing saturation is one of the important parameters in evaluating whether the oil reservoir is good or poor,the measuring method for oil bearing saturation with nuclear magnetic resonance logging is simple and easy with less time,which solved the problems of long circle and complex process that were existed in other oil bearing saturation measuring methods.Deep analyses were carried out in accordance with the extraction for oil saturation,the mass concentration of 15000 mg/L was selected as the standard to prepare MnCl_2 solution,a series of relative parameters, such as oil saturation soak time,etc.,were determined and the theoretic basis and ways for oil bearing saturation correction were analyzed.It was discovered by times of site tests that increasing the measurement for original rock state can determine the oil,gas and water loss content in rock samples,the authors provided the tertiary measurement way,which can effectively correct the oil bearing saturation measured by nuclear magnetic resonance.It showed a better result by wellsite application.