Abstract: The lithology of reef flat reservoir of Upper Ordovician in Tazhong No.1 slope break is dominated by carbonate rocks with variety and complexity of spaces of reservoir, which brings about difficult evaluations of it using well log data. This paper presents the space type and the reservoir type by means of log data integrated with core, experiment and well test information, including corresponding response characteristics and response models to calculate the pore parameter, fluid property and hydrocarbon saturation of each type of reservoir, thus realizing characterization and quantitative evaluation of such reservoirs. With these techniques, the coincidence rate of well log interpretation is improved from 65% to over 90% , and many old wells have acquired high production by reinterpretation. The recalculated parameters of reservoirs allow this area to add additional hundred-million-ton reserves.

Key words: Tarim basin, reef flat reservoir, carbonate rock, well log response, reservoir type, classification