复杂高电阻率碳酸盐岩储层深浅双侧向的解释探讨

与砂泥岩地层相比，碳酸盐岩地层常以高电阻率、大幅度差异为特征。影响碳酸盐岩地层电阻率高低的因素众多，由此造成了储层的划分和流体性质解释的难度。结合实测资料和模型模拟结果，对影响双侧向测量值和差异的各种因素逐一进行了分析，这些影响因素包括井眼大小、裂缝、岩性、泥浆滤液和地层水电阻率、孔隙度、含气饱和度、侵入深度等。总结了各种因素对双侧向测量值的影响程度，较好地解释了碳酸盐岩地层电阻率巨大起伏的原因和储层电阻率复杂多变的特性。该分析结果有助于更深入地认识碳酸盐岩地层中双侧向的变化规律，对储层进行更为精确的解释。

On Deep & Shallow Laterolog Data Interpretation of Complex Carbonate Reservoir with High Resistivity

Compared with sandstone, the carbonate formation in Feixiangguan Formation in northeast Sichuan usually shows high resistivity and great amplitude difference between deep and shallow laterolog data. There are many factors to affect the formation resistivity, which causes the difficulty in reservoir evaluation and gas detection within the pore space. With combination of log data and model simulation, these factors are analyzed which include wellbore sizes, fractures, components of rock, fluid resistivities, porosities, gas saturations and invasion depths, etc. Evaluation of their effect extent on laterolog measurement allows us to get a good interpretation about the characteristics of great fluctuant and complex resistivity changes of this carbonate reservoir, thereby helping us to better understand the rule of laterolog response to the carbonate formation and improve reservoir evaluation accuracy.