Abstract This study discusses the challenges in logging the evaluation of low-resistivity oil reservoirs,especially the difficult problems involving their saturation calculation. A correction method for equivalent water conductivity is proposed, given the high conductivity caused by small amounts of water distributed in a network within the low-resistivity reservoir, which mimics the effects of high water saturation. This approach significantly improves the accuracy of hydrocarbon saturation calculations in these low-resistivity reservoirs. The corrected hydrocarbon saturation values highly matched the porosity and are consistent with experimental results. This study also establishes a discrimination process to determine whether corrections are required, verifying the effectiveness and accuracy of the method through an application example.
Corresponding Authors: Jin Li-zuan (Email: 313376259@qq.com).
E-mail: 313376259@qq.com
About author: Jin Lizuan, Senior Engineer, graduated from Jianghan Petroleum Institute in 1989 with a bachelor’s degree in logging. He is currently working at the Exploration and Development Research Institute of China United Coalbed Methane Co., Ltd. He has been engaged in logging data processing and interpretation for a long time and has many innovative understandings in the field of low-resistivity logging evaluation of oil and gas reservoirs.
Cite this article:
. Saturation correction and efficient discrimination methods for low-resistivity sandstone oil reservoirs[J]. APPLIED GEOPHYSICS, 2025, 22(2): 319-330.
2025, Vol. 22 
