摘要
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 strong heterogeneity,conglomerate reservoir has a complex lithological and physical property background and a large rangeability of oil layer resistivity.All the above makes the quantitative evaluation of the conglomerate reservoir water-flooded layers the focus and difficulty of the second regulation and development in oilfield.Based on well logging,coring,testing data and reservoir quality index,under the guidance of petroleum migration and accumulation theory,the computational model of the initial oil saturation of conglomerate reservoir is built.The differential value between initial oil saturation and current oil saturation is defined in the computational model.And the ratio between differential value and initial oil saturation is defined as the productivity index,which is the dynamic water-flood characteristic parameter of the reservoir from the beginning of waterflood development to the current reservoir state.Compared with the traditional waterflood characteristic parameter such as water production ratio and oil saturation,the advantage of productivity index lies in that it takes the dynamic waterflood process of reservoir into account.As a result,it has successfully avoided the great variation of resistivity rangeability of conglomerate reservoir and the shortcoming of quantitative evaluation on water flooded layers only by using current oil saturation.This method is used in the evaluation of conglomerate reservoir water flooded layers in Karamay Oilfield.and the results show that productivity index is the highest sensitive to quantitative evaluation of water flooded layers by comparative study of three waterflood parameters,with the rate of recognition accuracy of 89.58%.The evaluation results provide technical support for the adjustment of well pattern and the design of development program in Karamay Oilfield.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2010年第4期92-98,共7页
Journal of Southwest Petroleum University(Science & Technology Edition)
基金
国家"973"项目"非均质油气藏地球物理探测的基础研究"(2007CB209600)
关键词
砾岩油藏
原始含油饱和度
采出指数
水淹层
定量评价
conglomerate reservoir
original oil saturation
productivity index
water flooded layers
quantitative evaluation
