关键词: 砂砾岩, 水淹层, 测井, 水淹特征, 水淹机理, 电阻率, 实验研究

Abstract: Based on the study of its actual well log data,logging attributes and water-flooding mechanism of the study area,the grit water-flooding reservoir can be identified qualitatively by using GR,SP,DT,ML and RT curves.The quantitative identification indexes include the following parameters:gamma ray relative value,ΔGR,is below,the middle value of particles is over 0.24,and the travel time DT is less than 260μs/m.In the process of water-flooding,reservoir porosity and permeability increase,and the coefficient of pore structure reduces,and wettability turns from hydrophobicity or neutrality to weak to strong hydrophicity,and the Archie parameters such asm andnreduce as the resistivity of formation water increases.The salinity ratio of injecting water to in-situ formation is one of the major factors influencing on reservoir resistivity during water-flooding stage.Due to the different salinity of injecting water,relations between formation resistivity and water saturation show nonsymmetrical shapes of "U","L" or "∽".The study results are very helpful for log interpretation of waterflooding formation and establishment of adjustment plan.

Key words: grit reservoir, water-flooding formation, logging data, water-flooding mechanism, resistivity, quantitative identification