胜坨油田浅水浊积相储集层流动单元研究

A study on the flow units of shallow-water turbidite reservoirs in Shengtuo oil field

胜坨油田沙二段 1砂层组 2小层是浅水浊积相储集层 ,综合考虑岩性、物性、电性及非均质性和水淹特征 ,采用模糊聚类的方法将其分为 4类流动单元。流动单元E以中砂岩为主 ,处在沉积旋回下部 ,分布于浊流中心相 ,基本没有无水开采期 ,高含水期含水上升减缓 ,非均质性弱 ,纵向剩余油分布差别小 ;流动单元G以细砂岩为主 ,处于沉积旋回中下部 ,分布于浊流中心相边部及边缘相内侧 ,非均质性最弱 ,水淹较均匀 ,高含水期仍有可观的可动剩余油 ;流动单元M以细砂岩、粉砂岩为主 ,处于沉积旋回中上部 ,分布于浊流边缘相的外侧 ,非均质性较强 ,是剩余油较富集的部位 ;流动单元P以夹泥质粉砂岩、粉砂质泥岩的细、粉砂岩为主 ,处于沉积旋回的顶部及底部 ,分布于浊流相与湖相的交界部位 ,非均质性强 ,极容易形成剩余油 ,但剩余油总量不大且较难开发 ,经济价值不大。把流动单元研究与剩余油研究结合起来 ,可以为提高油气采收率提供可靠的地质依据。图 4参

The second horizon of the first formation of the Sha-2 member in Shengtuo oil field is a set of turbidite facies reservoir with good reservoir property developed in shallow water. After nearly 40 years waterflooding development, the field has got into high water-cut period and the reservoir property has changed very much. In order to study the distribution of the remaining oil betterly with very high water-cut in turbidite facies reservoir developed in shallow-water, flow unit was studied and has been classified into four types. The model of flow unit was studied from different aspects such as lithology, electric property and microstructure and the relationship between the four types of flow unit and the distribution of the remaining oil. The result indicates that the study of the remaining oil combined with flow unit can give a better directing in the development of the reservoir. It was verified that the method for the flow unit study in shallow water turbidity facies reservoir is effective.