高北斜坡中深层岩性油藏岩石电阻率实验研究

Experimental Study on Rock Resistivity of Medium Deep Lithologic Reservoir in Gaobei Slope

冀东油田南堡凹陷高北斜坡中深层岩性油藏电阻率测井响应复杂,给含油性评价带来了很大挑战。为了弄清岩石电阻率的变化规律,选取研究区不同类型的典型岩心,模拟不同地层水矿化度条件下的油驱水过程,进行配套的岩石电阻率实验测量。结果表明:胶结指数随地层水矿化度、孔隙度和储层品质因子的增大而增大,随阳离子交换量的增大而减小;饱和度指数随地层水矿化度和阳离子交换量的增大而增大,随孔隙度和储层品质因子的增大而减小。根据实验结果建立了动态岩电参数含水饱和度模型,依据该模型计算的结果与验证实验结果吻合很好,表明模型的可靠性高。

In order to understand the variation of the rock resistivity of the middle deep lithologic reservoirs in Gaobei slope of Nanbu sag,Jindong Oilfield,selecting typical cores of different types as research objects,their rock resistivity was measured by simulating the displacement of water with oil under different formation water salinity. The experimental results show that the cementation index increases with the increase of formation water salinity,reservoir porosity and reservoir quality factor,and it decreases withthe increase of cation exchange capacity. The saturation index increases with the increase of formation water salinity and cation exchange capacity,and decreases with the increase of reservoir porosity and reservoir quality factor. A model for calculating the water saturation was established based on a large number of experimental data. The calculated results of the water saturation with the model are in good agreement with experimental results,which shows the model is of high reliability.