单层剩余油的算法及应用

The Algorithm and Application of Remaining Oil Distribution in Single Layer

针对当前陆相储层深度开发油藏剩余油分布零散,控制因素多,研究难度大等问题,提出一种单层剩余油分布研究方法。利用构造、储层非均质性、井网布局、水驱动态等4项剩余油控制因素建立模糊数学模型,根据生产井的单层开发动态资料、新井电测解释资料以及动态监测资料,定量给出各控制因素对剩余油的隶属度,通过模糊运算,求出油藏中各井点单层的剩余油。方法用于胜坨油田一区注聚先导区11层,建立的剩余油综合评价指数分布模型立足于油藏开发实际,具有较强的可操作性,可为油藏的开发和调整提供依据。

A new approach for determining the remaining oil distribution in single layer was put forward in view of the various controlling factors, the discrete distribution and the difficulty in discrimination of remaining oil in nonmarine mature developed reservoir. Four controlling factors of remaining oil distribution, which include structure, heterogeneity, well pattern and water flood behavior of reservoir, were applied to build a fuzzy mathematic model. The degrees of attribution of all the controlling factors were calibrated by the production performance of single layer wells, the log interpretation of the new drilled wells and the remaining oil saturation monitoring wells. The comprehensive evaluation indexes of individual well points can be obtained to quantitatively characterize the distribution of remaining oil through the fuzzy calculation. The 1 layer, member 2 of the Shahejie Formation in segment 1 of Shengtuo oilfield was taken as an example. It belongs to fluvial reservoir and has been exploited for more than 40 years. The distribution model of comprehensive evaluation indexes was built up, which guilds the development and stimulation treatment satisfactorily.