致密砂岩导电规律与导电模型实验研究

发布时间：2018-04-19 01:19

本文选题：含泥含钙致密砂岩 + 有效介质对称导电理论　；参考：《东北石油大学》2017年硕士论文

【摘要】：致密砂岩储层具有低孔低渗,泥质、钙质含量高,孔隙结构复杂的特征,这些特征使得储层的导电规律相比于常规储层更加的复杂,现有的饱和度模型不能同时描述泥质、钙质及孔隙结构对致密砂岩导电规律的影响,为致密砂岩储层饱和度评价增加了难度。本文首先选取了15块致密砂岩储层岩心,对15块岩心进行了岩电实验、粒度分析、碳酸盐岩分析、压汞实验及核磁共振实验。运用15块岩心的实验数据资料深入研究了致密砂岩的导电规律,并分析了影响储层导电规律的三个主要因素—泥质、钙质胶结及孔隙结构,得出当岩石的泥质含量增大、钙质含量减小、孔隙结构变好时,岩石的导电性随之变好。基于致密砂岩的储层特征及其导电规律的实验研究结果,考虑致密砂岩导电性的三种主要影响因素,利用孔隙几何形态导电理论和连通导电方程能够描述复杂孔隙结构变化对岩石导电性的影响,而有效介质对称导电理论能够描述泥质、钙质胶结对岩石导电性的影响这一优点,将有效介质对称导电理论分别与孔隙几何形态导电理论以及连通导电方程结合,综合建立了两种能够适用于致密砂岩储层的导电模型。采用单参数变化的方法,对两种致密砂岩导电模型进行了理论验证,表明两种致密砂岩导电模型均能够正确的描述泥质、钙质胶结以及孔隙结构变化对致密砂岩导电规律的影响,并且两种模型预测的理论规律均与实验规律相符合。使用15块致密砂岩岩心实验测量数据,运用最优化技术对两种模型进行了实验验证,表明建立的两种致密砂岩导电模型均能够描述致密砂岩的导电规律。经过与1口密闭取心井饱和度的对比,建立的两种致密砂岩导电模型计算的含水饱和度平均绝对误差分别为5.8%和5.7%;利用本文建立的两种模型处理解释了致密砂岩储层的实际井资料,通过对比处理解释结果与试油结果,发现二者相吻合,综合以上结果表明本文所建立的两种致密砂岩导电模型能够很好地适用于含泥含钙孔隙结构复杂的致密砂岩储层测井解释评价。
[Abstract]:The tight sandstone reservoir has the characteristics of low porosity and low permeability, high content of calcareous, high content of calcium and complex pore structure. These characteristics make the conductivity law of reservoir more complex than that of conventional reservoir, and the existing saturation model can not describe the muddy material at the same time.The influence of calcium and pore structure on the conductivity of tight sandstone makes it difficult to evaluate the saturation of tight sandstone reservoir.In this paper, 15 cores of tight sandstone reservoir are selected, and the experiments of rock electricity, particle size analysis, carbonate rock analysis, mercury injection and nuclear magnetic resonance are carried out in 15 cores.Based on the experimental data of 15 cores, the electrical conductivity of tight sandstone is studied in depth, and the three main factors that affect the conductivity of reservoir are analyzed, which are muddy, calcareous cementation and pore structure. It is concluded that when the shale content of the rock increases,With the decrease of calcium content and the improvement of pore structure, the conductivity of rock becomes better.Based on the experimental results of reservoir characteristics and electrical conductivity of tight sandstone, three main factors affecting the conductivity of tight sandstone are considered.The effect of complex pore structure changes on the conductivity of rock can be described by using the theory of conductivity of pore geometry and the connected conductive equation, while the effect of shale and calcium cementation on the conductivity of rock can be described by the theory of symmetric conductivity of effective medium.By combining the effective medium symmetric conductivity theory with the pore geometry shape conduction theory and the connected conductive equation, two conductive models suitable for tight sandstone reservoirs are established.By using the method of single parameter variation, two kinds of conductive models of tight sandstone are theoretically verified. It is shown that the two models can describe the shale correctly.The effects of calcareous cementation and pore structure changes on the conductivity of tight sandstone are discussed. The theoretical laws predicted by the two models are in agreement with the experimental ones.The experimental data of 15 tight sandstone cores were used to verify the two models by using optimization technique. The results show that both of the two models can describe the conductivity law of dense sandstone.After a comparison with the saturation of a closed coring well,The average absolute error of water saturation calculated by the two conductive models of tight sandstone is 5.8% and 5.7% respectively, and the actual well data of tight sandstone reservoir are interpreted by the two models established in this paper.By comparing the interpretation results with the oil test results, it is found that the two agree with each other.The above results show that the two conductive models developed in this paper can be well applied to the logging interpretation and evaluation of tight sandstone reservoirs with complex pore structure with mud and calcium.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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