RESEARCH ON A NOVEL METHOD FOR WATER-FLOODING EFFECT EVALUATION BASED ON THE UNCERTAIN MEASURE IN FRACTURED-VUGGY RESERVOIR

The fractured-vuggy reservoir is one important carbonate reservoir in the world. Compared with the sandstone reservoir, the carbonate fractured-vuggy reservoir has some significant characteristics such as the strong reservoir dispersion and the single inter well connectivity. Currently, the evaluation indexes, the evaluation standards and evaluation methods for water-flooding development effect in the fractured-vuggy reservoir are not uniform. To solve the issues include large uncertainty in evaluation and a big difference in evaluation results caused by the different indexes in the fractured-vuggy reservoir, we choice five typical evaluation indexes to estimate water-flooding development effect in fractured-vuggy reservoir. The indexes include increase in recovery rate, energy keeping rate, annual comprehensive oil production natural decline rate, water/oil exchange rate and water content rise rate. Meanwhile, a new evaluation method of evaluating fractured-vuggy reservoir water-flooding development effect is established based on the uncertain measure. The field application shows that the newly established water-flooding development effect evaluation method has a good match with reservoir dynamic analysis results, and our method can be used for the water-flooding development effect evaluation in fractured reservoir.