海水注入开发中剩余油饱和度评价研究

Research of residual oil saturation evaluation in high salinity water injection development

蔡军 李茂文 何胜林

CAI Jun LI Mao-wen HE Sheng-lin

中海石油中国有限公司湛江分公司, 广东湛江 524057

Zhanjiang Branch of CNOOC Limited, Guangdong, 524057

剩余油饱和度评价是油田水淹层测井评价中的重点和难点。当油田发生水淹后,储层的润湿性、地层水电阻率都将发生较大的变化,因此剩余油饱和度评价所需的处理参数必须重新确定。以南中国海某河流相沉积油田的储层在水淹后的剩余油饱和度评价中的关键参数研究为例,通过模拟油藏条件下的岩电实验和地层混合水矿化度与实际含水率的关系,研究探索求取剩余油饱和度评价关键参数的有效方法,应用中与实际生产符合较好,为此类开发油田的剩余油饱和度的精确评价奠定了基础。

Evaluation of residual oil saturation is the difficulty and key in the water flooding zone logging interpretation.Wettability and formation water resistivity will change a lot once the reservoir is flooded.Therefore some parameters used in the saturation estimation need to be redefined.One example which lie in fluvial facies deposit oil field of South China Sea for studying key parameters in saturation evaluation of flooding zone is given in the paper.An effective way of getting key parameters for residual oil saturation evaluation was developed through the rock electricity experiments simulating reservoir conditions and relationship pursue between the mixed water salinity and the actual water cut.The method was in great accordance with field practice in application,and lays a foundation for exact evaluating residual oil saturation of such kinds of oilfield development.

10.3969/j.issn.1000-7393.2007.06.025