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由于储层非均质性严重,砾岩油藏具有岩性物性背景复杂以及油层电阻率变化幅度大等特点,其水淹层的定量评价已经成为油田二次调整开发的重点和难点。基于测井、取芯、测试等分析资料,应用油气运聚成藏理论,在储层品质因子研究的基础上,建立了砾岩油藏原始含油饱和度的计算模型。定义原始含油饱和度和目前含油饱和度的差值与原始含油饱和度的比值为储层的采出指数,表征注水开发以后到目前油藏状态下储层动态水淹的特征参数,与传统的产水率和含油饱和度两个水淹特征参数相比,其优势在于考虑了油层动态水淹的过程,消除了砾岩油藏本身因为电阻率变化幅度大且单一利用目前含油饱和度定量评价水淹层的缺点。将该法应用于克拉玛依油田砾岩油藏水淹层的评价中,对比研究了含油饱和度、产水率和采出指数3个参数对砾岩油藏的水淹敏感性。结果表明:采出指数敏感性最高,识别准确率达到89.58%,提高了砾岩油藏水淹层的识别精度,为克拉玛依油田井网调整和开发方案的设计提供了技术支持。
Due to the serious reservoir heterogeneity, the complex nature of conglomerate reservoirs and the large variation range of oil resistivity, the quantitative evaluation of water flooded layer has become the focus and difficulty of the secondary adjustment and development of oilfield. Based on the analysis data of logging, coring and testing, and using the theory of hydrocarbon accumulation and accumulation, based on the study of reservoir quality factor, the calculation model of the original oil saturation of conglomerate reservoir is established. The ratio between the original oil saturation and the current oil saturation is defined as the recovery index of the reservoir, and the characteristic parameters of the dynamic water flooding of the reservoir after the waterflood development to the current reservoir state are characterized. Compared with the traditional Compared with the two parameters of water flooding, the advantage of water yield and oil saturation is that the process of dynamic flooding of reservoir is taken into consideration, and the conglomerate reservoir itself is eliminated because of the large variation of resistivity and the quantitative evaluation of the present oil saturation Disadvantages of flooded layers. The method was applied to the evaluation of water flooded layer in conglomerate reservoir of Karamay Oilfield. The sensitivity of water flooding to conglomerate reservoir was compared with the three parameters of oil saturation, water cut and recovery index. The results show that the index has the highest sensitivity and the recognition accuracy is 89.58%, which improves the identification accuracy of water flooded layer in conglomerate reservoir and provides technical support for the design of well pattern adjustment and development plan in Karamay Oilfield.