基于微观表征参数的流动单元划分及应用

Flow Units Division and Application Based on Microscopic Characterization Parameters

孔令辉 顿小妹 凌涛 汪明伟 陈之贺

KONG Linghui DUN Xiaomei LING Tao WANG Mingwei CHEN Zhihe

中海石油(中国)有限公司湛江分公司, 广东湛江 524057

Research Institute of Zhanjiang Branch, CNOOC Ltd., Guangdong Zhanjiang 524057, China

针对油田开发中后期储层非均质性导致剩余油分布规律复杂的问题，根据测井资料和密闭取心分析化验资料，利用基于微观表征参数的流动单元划分方法，将目标区储层划分为三类流动单元，并结合生产动态特征进行目标区油藏开发中后期剩余油规律研究。结果表明：目标区发育典型的粒度向上变细的退积型近源陡坡扇三角洲前缘沉积；在扇体的中心部位以I类流动单元为主，并存在大量优势渗流通道，水淹程度较高；扇体南、北翼流动单元类型相对稍差，水淹程度较低，剩余油较为富集，为后期调整挖潜的有利区域。

The distribution of remaining oil is complicated due to reservoir heterogeneity in the middle and late stage of oilfield development. Based on well logs and analysis data of sealed coring, by using the flow units division method according to microscopic characterization parameters, the reservoir was sub-divided into three types of flow units. The remaining oil distribution in target area was evaluated and predicted further by integrating the oil field production behavior. The study shows that proximal retrograding fan-delta front deposits with fining grains upwards developed typically. The reservoirs sitting in the central part of the fan-delta are mainly Type I flow units, with plenty of advantage flow channels and high water flooding, while the reservoirs sitting in the northern and southern parts of the fan-delta, are mainly Type Ⅱ and Ⅲ flow units with low water flooding, where the remaining oil is rich as well. Therefore, the prospective areas in the late period of oil production locate in the northern and southern part of the fan-delta.

https://doi.org/10.3969/j.issn.1008-2336.2019.04.006