南堡凹陷复杂砂岩储层含水饱和度模型的研究

南堡油田第三系受沉积微相和成岩作用的影响发育大量的复杂砂岩储层,束缚水饱和度和阳离子交换量偏高,储层孔隙结构复杂,地层因素和孔隙度表现出非阿尔奇关系的特征.通过岩电分析可知,当阳离子交换附加导电性较强时,阿尔奇公式中的m、n值主要受阳离子交换量(Qv)影响,与Qv呈指数关系;当阳离子交换附加导电性较弱时,m、n值主要受孔隙结构影响,与√K/φ呈对数关系.新的解释参数确定方法考虑了阳离子交换量、孔隙结构和地层水电阻率对m、n值的影响,在复杂砂岩油气藏实际测井评价中得到了良好的效果.

On Water Saturation Model for Complex Sand Reservoir in Nanpu Sag

Because of the impact of precipitation facies and lithogeny, there are many complex reservoirs in Nanpu oil field with characteristics of high bond water saturation, high cation ex-change capacity and complex pore structures. The reservoir's electrical parameters are different from that of conventional sandstone reservoir so that we can't use Archie's equation to do reservoir evaluation. By analyzing the core electrical properties, it is found that rn and n in Archie's equa-tion are mainly influenced by cation exchange capacity (Qv) when cation additional conductivity is high, and exponential with Qv; They are mainly influenced by pore structures when the cation additional conductivity is low, and logarithmic with √K/φ. The adjusted model reflected the in-fluences of cation exchange capacity, pore structures and formation water salinity. Actual data processing of the complex sancl reservoir has proved the new model is much better than the con-ventional one.