南海西部油田复杂储层测井综合解释技术

Integral Logging Interpretation Technology for Complex Reservoirs in West of South China Sea

论述了南海西部油田复杂储层的特点及测井评价遇到的问题,针对浅层泥质粉细砂岩泥质含量计算的难题,有针对性地提出了由NDS(中子-密度间隔)曲线、核磁共振测井及电成像测井计算泥质含量共3种非常规方法;针对复杂成岩环境下,岩石组分的不确定性及由此带来的测井孔隙度计算参数的敏感性,提出了由电成像或元素谱测井确定岩石组分、基于岩相或电成像伪分选系数确定可变骨架密度的密度孔隙度计算方法;最后在考察国内外现有饱和度模型的基础上,提出了适用于该区复杂孔隙结构低渗储层的三孔隙(自由孔隙、粘土孔隙、微孔隙)饱和度模型,并探讨了骨架导电的校正方法及微孔隙结构岩电参数的确定方法。

The complex reservoir characters and its challenge to well logging evaluation were discussed.To solve the difficulty of shale content calculation in the shaly siltstone of shallow formation,three non-conventional practical methods were proposed,including NDS,NMR and electrical imaging logging.For the uncertain of rock composition and sensitivity of logging porosity parameters due to complex diagenesis,the methods of electrical imaging logging or elemental capture spectroscopy logging were used to determine the rock components,also a variable matrix density was obtained from rock types or pseudo-sorting index from electrical imaging logging in order to get porosity from density logging.Finally a three-pore saturation model is put forward which is suitable for locally complex reservoirs,also the effect of Pyrite on Rt and the electrical parameter m is discussed for getting it for different rock pore structures.