Abstract: Well logging methods and applied conditions are presented. Combined with the geologic feature of Toutunhe reservoir in Shinan-21 Well Block, the method for identifying and quantitatively evaluating oil-gas zone by using well log data is approached. The analysis of applied response from array induction log and the analysis of filtrate-invaded zone are conducted to study the log response features of oil and water layers, by which a quick and visual distinguishing method for distinguishing pay zone by means of well log data is proposed. The core-calibrated log approach and the statistical analysis technique are adopted to realize the application of developed quantitative reservoir evaluation model to detailed reservoir evaluation and well log interpretation and offer more proper parameters. For the study of oil-water distribution, the multi-well MDT data are used to build up the reservoir pressure profile and determine the fluid density of the reservoir. By the composite analysis of available conventional well log and production test data, the oil-water contact of this reservoir is exactly determined.

Key words: geologic feature, log response, array induction log, quantitative evaluation, oil-water contact