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四川盆地广安地区上三叠统须家河组属于典型的低孔低渗储层,复杂的微孔隙系统导致其具有很高的束缚水饱和度,加上较高的地层水矿化度,使得渗透层段的电阻率值相对较低,甚至小于相邻泥岩层段电阻率。为较好地判别广安地区低阻储层的流体性质,部分重点井同时测有双侧向和阵列感应两组电阻率曲线。对于相同的介质而言,感应测井仪的响应值应该与侧向测井测到的电阻率值相同,但广安地区须家河组实际测井资料却表明电测曲线在该地区部分井的低阻储层段表现为深感应与深侧向值存在一定的差异。为此从双侧向测井和阵列感应测井的测量原理出发,分析了造成这种差异的原因,认为低阻储层深侧向与深感应测井值存在差异主要是两种测井方法的测量原理不同和适用条件不同所造成的。
The Upper Triassic Xujiahe Formation in Guang’an area of Sichuan Basin belongs to typical low-porosity and low-permeability reservoirs. Complex micro-pore system leads to high irreducible water saturation and high salinity of formation water, The resistivity of the permeable section is relatively low, even less than the resistivity of the adjacent mudstone section. In order to better discriminate the fluid properties of low-resistivity reservoirs in Guang’an, the resistivity curves of two groups of lateral and array induction were measured simultaneously in some key wells. For the same medium, the response of the induction logging tool should be the same as the resistivity measured from the lateral logging, but the actual logging data of the Xujiahe Formation in Guang’an indicates that the measured curve of the electrical logging curve in some wells in the area There are some differences between the deep resistivity and deep lateral values in the low resistivity reservoir section. Based on the measurement principle of dual lateral logging and array induction logging, the reason of this difference is analyzed. It is considered that the difference between deep lateral and deep sensing logging values of low resistance reservoirs is mainly two logging methods The measurement principle of different and applicable conditions caused by different.