主力聚合物驱油藏不同储层见效差异研究

大庆油田是目前国内最重要的、最具代表性的主力聚驱油藏，其聚合物驱潜力几乎全部集中在大庆长垣。自北向南，大庆长垣储层的沉积特征具有较强的方向性和规律性。按照大庆油田主力厚油层沉积微相的分布特征、油层纵向非均质性以及储层和流体的物性变化，将聚合物驱储层划分为北部多段多韵律油层、中部正韵律厚油层以及南部复合韵律厚油层3种情况；针对不同情况下的储层特征，从水洗程度变化、提高采收率幅度等角度系统地研究了大庆主力聚合物驱油藏的见效差异性，并分析了差异产生的根本原因。研究成果可为厚油层聚合物驱的高效、合理开发以及聚驱后剩余油的调整挖潜提供参考。

Study on response differences of major polymer flooding in various reservoirs

Daqing Oilfield is the most important and representative reservoir mainly for polymer flooding at present.Almost all reserve potentials of polymer flooding are centralized in Daqing placanticline.From north to south,sedimentary characteristics of placan-ticline reservoir have strong directivity and regularity.In this paper,types of reservoir for polymer flooding were divided into north multi-stage and multi-rhythm layer,central positive rhythm thick layer and south compound rhythm thick layer,according to the distribution features of major reservoir sedimentary microfacies,vertical heterogeneity and rock and fluid properties.Then,aiming at three kinds of reservoir characteristics,response differences of polymer flooding in these layers were studied comprehensively and systematically in terms of water flooding degree and EOR efficiency.Meanwhile,the root causes of the differences were analyzed.The research results can provide scientific references and technical support for efficient and rational development of polymer flooding in the thick reservoir and also potential tapping on residual oil after polymer flooding.