海上复杂断块油田低序级断层预测——以渤海P油田为例

Low-order fault prediction in offshore complex fault-block oilfield:a case study of Bohai P Oilfield

处于开发中后期的复杂断块油田,低序级断层成为制约注采建立的关键因素,影响油田的开发效果。渤海P油田受气云区影响,地震属性响应特征弱,增加了低序级断层的识别难度。从低序级断层的成因机理出发,综合高序级组合模式、构造应力分析、断层露头调查、实钻井、地震属性正演分析以及动态辅助六个方面开展研究,提出低序级断层“六要素”预测方法,建立了走滑断层S型转弯区、走滑断层叠覆区、正断层下降盘三类低序级断层发育模式,实现对低序级断层的预测,并有效指导油田注采井网的调整。

In the middle and late stage of the development of the complex fault block oilfield,the low-order fault becomes the key factor restricting the establishment of injection and production,which affects the development effect of the oilfield.Bohai P Oilfield is a complex fault block oilfield.Due to the influence of gas cloud area,the geophysical response characteristics are weak,which further increases the difficulty of identifying low-order faults.Starting from the low-order fault formation mechanism,combined with comprehensive available data,such as oilfield stress analysis,high-order combination mode,fault outcrop survey,solid drilling,seismic attribute positive analysis and dynamic auxiliary,the"six elements"prediction method is proposed,and three types of development models are established,which are strike-slip fault S tum,strike-slip fault overlapping area,and positive fault fall plate,so as to realize low-order fault prediction and provide guidance for the adjustment of injection and production well pattern.