低渗油藏复杂油水关系形成原因及开发问题

Causes of Complex Oil-Water Relationship of Low Permeability Reservoir and Problems During Development

低渗油藏一般具有岩性变化快、油水关系复杂、物性不好等特征,因此对其进行开发的难度较大,特别是中后期的稳产面临严峻的考验。本文针对胡尖山油田元72区延9复杂油藏稳产策及方法进行了深入研究。通过对油藏地质精细刻画,搞清了砂体的空间展布及叠置关系;从单井流体类型识别、剖面油水关系对比分析了油藏原始油水关系及分布规律;结合油藏的开发效果及效果,提出了该油藏具有油水关系控水、储层条件控产的特征;综合单井地质特征、单井动态特征分类和井组划分及井组动态分析提出了目前油藏开发所面临的稳产问题。根据稳产所面临的问题,结合油藏地质和生产动态提出了补孔、转层、转注、关井、提液、控液、注水量调整、堵水等稳产技术对策。

Generally low permeability reservoirs have quickly changed lithology, complex relationships between water and oil, poor physical characteristics and so on, which make their development more difficult, especially in the middle and late development work. In this paper, 9th Member of Yan＇an Formation in Yuan 72 well block of Hujianshan oil field was studied. Based on fine reservoir geological features, the spatial distribution of sand body and the superimposed relationship were found out; According to classification and evaluation of the space types, physical properties and pore structure characteristics of the reservoir were analyzed; From single well fluid type identification and section oil-water relationship comparison, the original oil-water relationship and the reservoir distribution were analyzed and through the reservoir history matching, the situation of further complicate oil-water relationship in development was studied. According to the faced problem, combined with reservoir geology and production performance, filling holes, transferring layer, controlling solution, water injection rate adjustment, water control and other technical countermeasures were put forward.