塔河油田奥陶系碳酸盐岩油藏缝洞单元注水开发分析

A DISCUSSION ON WATER FLOODING IN THE MULTI-WELL FRACTURED-VUGGY UNITS OF CARBONATE RESERVOIRS IN TAHE OILFIELD

塔河油田奥陶系油藏储集空间主要以洞穴为主,其次为裂缝、溶蚀孔隙、溶蚀孔洞;储层相对较发育,但其发育状况受构造变形和岩溶作用共同控制,储集类型、储集空间的分布规律比较复杂,具有较强的非均质性。在前期缝洞单元的初步划分的基础上,我们对单元实施注水开发后,开发效果得到明显改善。本文通过对S48单元注水开发进行详细剖析,分析注水开发机理,注水受效机理,注水技术政策,指导下步缝洞型碳酸盐岩油藏的注水开发。

The main reservoir spaces in Ordovician reservoirs of Tahe oil-field are caves,accompanying with fractures,corroded fissure and dissolved pores.Its reservoir is relatively developed,which is controlled by tectonic deformation and kastification.The distribution of reservoir types and spaces are more comlex,and are characterized by high heterogeneity.Based on the preliminary blocking of inintial reservoir,the development effects is enhanced by water flooding.in the paper,the development and efficiency mechanism of water flooding,as well as water flooding technology in well S48 are analyzed in detail,which can be the next guidance for water flooding development of paleocaves reservoir.