复杂断块油藏优势通道识别与定量描述——以涠州12-1油田北块6井区为例

Preferential pathway identification and quantitative description of complex fault-block reservoir-a case study of well block-6 in northern Weizhou 12-1 oilfield

海上断块油藏平面与纵向上非均质性强,注采井距大,长期注水开发易形成优势通道,水驱开发效果差;并且由于合采合注井较多,纵向各层注入、产出不清,单一的优势通道评价方法准确性较差。以涠洲12-1油田北块6井区为例,综合应用井间动态连通性分析方法、无因次PI值方法、示踪剂试井及流线模拟技术,对该区块优势通道发育情况进行识别和定量描述,并结合数值模拟相互验证,为后续的剩余油分布研究和制定合理的调整方案奠定基础。

On the plane and in vertical direction,the offshore fault block reservoir is characterized by strong heterogeneity and large injection-production well spacing.After long-term water injection development,it is easy to form the preferential pathway and the water-flooding development effect is poor.Due to many commingled injection and production wells,it is not easy to make clear each layer's injection volume and output,and the evaluation accuracy of single preferential pathway is worse.By taking well block-6in northern Weizhou 12-1 oilfield as the example,through comprehensive inter-well dynamic connectivity analysis method,dimensionless PI value method,tracer testing and streamline simulation,the study on preferential pathway identification and quantitative description of the complex fault-block reservoir has been carried out.Combined with the numerical simulation,the results have been verified,which can provide the theoretical basis for follow up remaining oil distribution study and reasonable adjustment programs.