渤海新近系高束缚水低阻油层饱和度计算方法

渤海新近系油田发育大量低阻油层,低阻成因复杂,为了解决传统电性饱和度模型计算精度较差的问题,开展了低阻油层成因机理分析及相适用的饱和度计算方法研究.结果表明,复杂孔隙结构中小孔隙导致的高束缚水饱和度是低阻油层形成的一种重要因素;针对高束缚水饱和度引起的低阻油层,通过核磁共振与常规测井建立的核磁–双孔隙介质高束缚水饱和度...

Calculation method of saturation of Neogene reservoirs with high irreducible water and low resistivity in Bohai Sea

A large number of low resistivity reservoirs are developed in Neogene oil fields in Bohai Sea, and the genesis of low resistivity is complex. In order to solve the problem of poor calculation accuracy of traditional electrical saturation model, the genetic mechanism of low resistivity reservoir and the applicable saturation calculation method are studied. The results show the high irreducible water saturation caused by small pores in complex pore structure is an important factor in the formation of low resistivity reservoir. In view of the low resistivity reservoir caused by high irreducible water saturation, a calculation model based on nuclear magnetic dual porosity medium theory is established, which is suitable for saturation evaluation of high irreducible water and low resistivity reservoirs caused by pore structure. The application results show the fitting accuracy of petro-electric parameters of NMR(Nuclear Magnetic Resonance) dual pore medium model is higher and the calculated saturation is more accurate, which provides a new and effective method for saturation evaluation of low resistivity reservoirs in Neogene oilfields and similar oilfields in Bohai Sea.