丘陵油田三间房组自然电位异常水淹层判别方法

丘陵油田经多年注水开发,目前已进入中高期含水阶段。受注入水影响,储层形成多压力系统。由于低矿化度注入水的影响,水淹层的扩散吸附电位发生不同程度变异;因加密调整井泥浆密度较高,过滤电位对自然电位的影响不能忽略。过滤电位和变异的扩散吸附电位叠加造成自然电位异常,会影响储层解释结果的正确性。统计所有自然电位异常层的试油情况,分析试油结果与测井响应特征关系,提出判别自然电位异常储层含油性的方法。

Identification of Watered-out Zones of Abnormal Natural Potential of Sanjianfang Formation in Qiuling oil field

Qiuling oilfield has entered the period of high water stage,After many years development under water flooding,Affected by the injection water,reservoir formation of multi-pressure system.Due to the low impact of injected water salinity,water flooded the diffusion layer adsorption potential mutation in different degrees;mud density adjustment wells due to the higher encryption,filtering potential impact on the natural potential can not be ignored.Variation of the diffusion filter adsorption potential and sup...