Abstract: Targeted at the problems of uneven vertical water flooding and gradual deterioration of development effect in the reservoirs of block B in G Oilfield with thick oil layers during water flooding，and combined with the actual geological parameters，a waterflood mechanism model for thick reservoirs is established. The influence of different perforation adjustment modes and adjustment timing of oil and water wells on the effect of water flooding is simulated and analyzed，and the optimal mode for next step of adjustment is given. Study results show that all oil and water wells should be perforated for production in the waterflood process of reservoirs，and high water-cut layers should be sealed off in time so that production can return to upward layers one by one after oil wells have water breakthrough. The effect of oil-water gravity differentiation should be fully utilized，which not only prevents the rapid formation of preferential channels after oil wells are waterflooded，but also reduces water cut. In addition，large production thickness of oil wells is beneficial to maintain higher oil production rate and better economic benefits，which is worth being applied and popularized. 

Key words: thick reservoir；water flooding；perforation adjustment；adjustment timing；waterflood mechanism model 

摘要： 针对G油田B块厚油层油藏在注水开发过程中存在纵向上水淹不均、开发效果逐渐变差的问题，结合实际地质参数 建立了厚油层水驱机理模型。模拟分析了油水井不同射孔调整方式与调整时机对注水开发效果的影响，并给出了下步调 整的最优方式。研究认为，厚油层油藏注水开发过程中油水井全部射开生产，油井见水后及时封堵高含水层逐层上返，充 分利用油水重力分异作用，不仅防止了油井水淹后优势通道的快速形成、降低了含水；同时油井生产厚度大有利于保持较 高的采油速度和较好的经济效益，具有较高的推广应用价值。

关键词: 厚油层；注水开发；射孔调整；调整时机；水驱机理模型