低序级断层识别技术在复杂断块油藏注采调整中的运用

Application of farewell fault detection technology to the polymer adjustment in complex fault block reservoirs

孤岛油田南区是被断层复杂化的稠油、疏松砂岩油藏,地质条件复杂,区内共有大小断层13条,将该区切割成11个断块,各主要断块都有自己独立的油水系统,对聚合物驱油产生了不利影响。为了准确识别断裂系统,调整油田的注采对应关系,提高油田的开发水平,利用小波多尺度边缘检测技术、相干体分析技术对区内的低序级断层进行了多轮解释,重新绘制了该区的断层分布图,并利用干扰试井、动态分析等方法对新解释断裂系统的准确性进行了检验,在此基础上调整了注采对应关系,开展了注聚合物综合调整,聚合物驱增油效果得到明显提高。

The southern district of Gudao Oilfield is a heavy oil and sparse sandstone reservoir, which is complicated by faults, and has complex geologic conditions. 13 faults separate the whole district into 11 blocks, and every block has its own oil and water system, which brings bad effect on polymer flooding. In order to recognize the rupture system, adjust the injection-production corresponding relation and improve the effect of polymer flooding, the technologies of small wave and more scales test and coherence analysis are used to explain farewell faults, and the distribution map of the faults is redrawn in the south district. The methods of interference test and performance analysis are employed to test the veracity of the new rupture system. Based on above, the injection-production corresponding relation is adjusted, with the polymer flooding effect improved.