海上复杂断块油田断层封闭性综合评价——以PL油田为例

发布时间：2018-05-01 12:09

本文选题：岩性对置法 + 断层泥比率法　；参考：《断块油气田》2017年06期

【摘要】：PL油田断裂系统发育,断层复杂。采用岩性对置法、断层泥比率法等直接法和测试断层两侧油水界面、原油性质等间接方法,对PL油田典型断层原始状态下的封闭性进行分析,并应用油田原始压力数据针对开发过程中断层的封闭性变化情况,研究了断层在不同时期的封闭性,分析了断层封闭性改变的原因。结果表明,PL油田走滑断层和正断层原始状态下多处于封闭状态,但存在封闭薄弱区,随着油田的不断开发,断块间压力平衡逐渐受到破坏,断层局部封闭能力减弱,发生开启现象。断层在局部存在着封闭性薄弱区,断层一侧长期生产而另一侧未开发,导致断块间压差逐渐增大,是断层后期局部开启的主要原因。通过对PL油田断层封闭性研究方法的适用性分析得出,断层泥比率法通常适用于断距不大的断层封闭性研究,而岩性对置法则适用于不同断距的断层。
[Abstract]:The fault system is developed and the fault is complex in PL oilfield. By means of lithology contrast method, fault gouge ratio method and indirect methods such as testing oil-water interface on both sides of fault and crude oil properties, the sealing properties of typical faults in PL oilfield are analyzed in the original state. Based on the original pressure data of oil field, the sealing characteristics of faults in different periods are studied, and the reasons for the change of fault sealing are analyzed. The results show that the strike slip fault and normal fault are mostly closed in the original state, but there are weak sealing areas. With the continuous development of the oilfield, the pressure balance between the fault blocks is gradually destroyed, and the local sealing ability of the fault is weakened. An opening occurs. There is a local sealing weak area in the fault, one side of the fault is produced for a long time and the other side is not developed, which leads to the gradual increase of the pressure difference between the fault blocks, which is the main reason for the local opening in the later period of the fault. By analyzing the applicability of the fault sealing method in PL oilfield, it is concluded that the fault gouge ratio method is usually suitable for the study of fault sealing with small fault spacing, while the lithologic contrast rule is suitable for the fault with different fault spacing.
【作者单位】：中海油研究总院;
【分类号】：P618.13;TE53

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