碳酸盐岩油藏流动单元研究方法探讨

流动单元研究对于提高油田采收率具有很大的实际意义，该项研究在砂岩油藏研究中已取得较大进展．对于缝洞型碳酸盐岩油藏由于成因、岩性和岩石结构构造、成岩后生作用、构造断裂作用、溶蚀作用等多因素对储集空间的影响，使已有的流动单元概念及研究技术方法难于应用．针对缝洞型碳酸盐岩地质特征，论证了碳酸盐岩储层渗流屏障的存在及其类型．提出区别于砂岩油藏的缝洞型碳酸盐岩储层流动单元的概念．说明各类动态资料对油藏储层流动单元研究较为重要．提出了研究思路和方法，包括：油藏压力趋势分析法、井间生产干扰分析法、流体性质差异分析法、井间干扰试井法．并结合塔河油田实际资料。进行了初步分析．

AN APPROACH ON FLOW UNITS IN FRACTURE-AND-CAVERNOUS CARBONATE RESERVOIRS

The researches on flow units is valuable in increasing the recovery of reserves.and it has resulted many successful practices in sand reservoirs. But the genesis of the carbonite reservoir rocks, the differences in lithology, diagenesis, post diagenesis, structural fractures and dissolution have made it difficult for the general concepts and methods of the flow units to be suitably used in fracture-and-cavernous carbonate reservoirs. In this paper, we illustrated the presence of seepage barriers and its types according to the geological properties of carbonate reservoirs and suggested a new concept different from that of the flow unit in sandstone reservoirs. With it, we analyzed the data of reservoirs in Tahe Oilfield