具有边底水碳酸盐岩油藏见水特征分析

Analysis on Water Breakthrough in Carbonate Reservoirs with Edge Water and Bottom Water

碳酸盐岩油藏是一种多重介质的溶缝洞型油藏。储层一般为块状分布,构成多个单独的储集系统,开发过程也是以单井或井组为基础的独立开发单元。分析油井见水特征及见水方式对控制边底水的突进和底水锥进有着很重要的作用,同时可以根据见水特征分析储层特征。以轮古2井区和桑南西区块为实例分析了油井见水特征,将其见水特征分为4种类型,即水锥型、层状型、裂缝型和条带型。根据见水特征来认识储集层特征,同时提出了控制油井含水和边底水突进的措施。根据见水类型分析,可以以不同类型的缝洞单元为油藏管理对象,对不同类型缝洞单元采取不同的开发政策。

Carbonate reservoirs were multiple medium and dissolved fracture reservoirs. Generally, reservoirs presented block distribution were constituted by a lot of independent accumulated systems. Independent development unit was created based on one well or a group of wells. Analyzing the water breakthrough characteristics and types of oil wells was very important for controlling the advancement of edge and bottom water as well as bottom water coning, meanwhile the geologic features of the reservoir swere analyzed according to the water breakthrough feature of wells. The water breakthrough characteristics and types are analyzed by the example of Lungu Well Block 2 and Sangnan West Block, reservoir feature can be known according to the water breakthrough characteristics, at the same time the measures to control oil well containing water and advancement of edge and bottom water are proposed. Based on different types of accumulation system as reservoir management target, different development policies are deployed for different dissolved fracture reservoirs.