伊拉克AH油田孔隙型碳酸盐岩油藏压力恢复曲线特征

Pressure buildup curve behavior of pore type carbonate reservoir in AH Oilfield of Iraq

伊拉克AH油田是一个以孔隙型为主、局部发育缝洞的碳酸盐岩油藏,其压力恢复曲线受储层特征影响,呈现出不同的响应特征,对其进行分类分析可以达到深化储层认识和预测储层类型的目的。文中采用试井油藏模型组合研究方法,通过建立不同类型储层试井模型及对压力恢复曲线分类,得到了8种压力恢复曲线特征,分析了不同生产阶段及酸化措施前后的压力恢复曲线特征变化。这些曲线较好地反映了AH油田带缝洞的孔隙型碳酸盐岩油藏的储层物性和储层类型变化特征,深化了对油藏渗流类型及渗流特征的认识,实现了对该油田复杂储渗单元动态渗流模型的精细刻画,对其有效开发具有一定的指导意义。

AH Oilfield is a pore type carbonate reservoir,while fracture and vug develop in the local area.The pressure buildup curve show different behaviors due to the complex reservoir characteristics.Analysis of different behaviors can deepen the understanding and prediction of reservoir types.The method of well testing reservoir model combination is used to build different types of models and analyze pressure buildup behavior.Eight types of pressure buildup models are established and the pressure buildup behaviors of different production stage and acidification measures are analyzed.The curves reflect the reservoir physical property and reservoir types of AH Oilfield,getting a better understanding of flow type and flow characteristic and realizing the fine description of dynamic flow model of complex reservoir unit,which has a certain guiding significance for the next step exploitation of this field.