红河油田延长组长9储层含油饱和度值域探讨

Discussion on oil saturation range in Chang 9 reservoir of Yanchang formation in Honghe oilfield

红河油田长9储层在近年的注水开发过程中显示出较为突出的低孔、特低渗–低渗储层特点,注水效果差、采出程度较低,因此有必要进行原始含油饱和度、油气微观富集规律的再认识。通过压汞、相渗及核磁共振、密闭取心等资料的分析,对长9储层的含油性及含油饱和度展开值域探讨。综合研究表明,红河油田储层含油性受控于物性,油气未饱和充注,考虑核磁测井解释可动水饱和度及生产产水情况,将长9有效储层原始含油饱和度值域确定为25%~45%。

In recent years, the waterflood development of Honghe oilfield was characterized by low porosity, low permeability, extra-low permeability, poor water injection and low recovery degree. Therefore, it is necessary to make further consideration on the original oil saturation and hydrocarbon microcosmic enrichment regularity. Through the analysis of mercury, phase permeability and nuclear magnetic resonance(NMR), the discussion on oil content and oil saturation range of Chang 9 reservoir was carried out. The comprehensive comparison indicated the reservoir was controlled by material and unsaturated oil and gas. Considering the explanation of the dynamic water saturation and the production water of the nuclear magnetic logging, the original oil saturation value of the reservoir was determined between 25% and 45%.