储层建筑结构要素分析及在剩余油挖潜中应用

ANALYSIS OF RESERVOIR ARCHITECTURE ELEMENTS AND ITS APPLICATION IN THE DEVELOPMENT OF REMAINING OIL

储层非均质性研究是油田开发后期剩余油挖潜、提高采收率的关键。以河流沉积学理论为指导、以现代沉积、露头调查为依据,利用密井网条件下丰富的测井资料和储层建筑结构层次分析方法对孤岛油田馆陶组上段储层进行了研究。研究认为,孤岛油田馆陶组上段储层可划分为十个层次,并将储层精细解剖到第七层次,识别出主河道、废弃河道、决口水道等七种建筑结构要素。在储层精细对比的基础上,总结出以单一河道砂体追溯为核心建立单砂体建筑结构模型的方法,并探讨了这种地质结构模型对于油田开发挖潜的重要意义。

Reservoir heterogeneity is a key factor to find remaining oil and enhance oil recovery in the later stage of production.Guided by the theory of fluviatile sedimentology,based on the present deposition and outcrop survey,we studied the upper reservoir of Guantao Group in Gudao Oilfield with abundant well logging data from the dense well network and reservoir architectural structure analysis method.The researches lead to the conlusion that the upper reservoir of Guantao Group in Gudao Oilfield can be divided into ten levels theoretically,and in our study reservoir has been divided into seven levels,from which seven architectural factors such as main stream channel,abandoned channel and crevasse channel etc.are identified.The method of building architectural model that focuses on retrieving single channel sand body is summarized on the basis of fine reservoir comparison.The significance of this geologic structural model to oilfield development is also discussed.