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流动单元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,已有的流动单元概念及研究技术方法难于应用。以塔河油田为例,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,探索性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。提出的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。结合储层发育特征,初步建立了缝洞型碳酸盐岩流动单元的划分标准。
Flow units have great practical significance for improving oil recovery, and the research has made great progress in the research of sandstone reservoirs. For fractured-hole carbonate reservoirs, the existing concept of flow cell and its research technique are difficult to be applied due to the influence of rock structure, diagenesis, tectonic faulting and dissolution on reservoir space. Taking Tahe Oilfield as an example, according to the geological characteristics of fractured-cavity carbonate rocks, the existence and type of percolation barriers in carbonate reservoirs are demonstrated, and fractured-cavity carbonate rocks different from sandstone reservoirs are tentatively proposed The concept of reservoir flow cell. The proposed research ideas and methods include: reservoir pressure trend analysis method, interwell production disturbance analysis method, fluid property difference analysis method and crosswell interference well test method. In combination with the reservoir developmental characteristics, the division standard of the fractured-cavity carbonate flow cells is preliminarily established.