基于岩石物理实验束缚水饱和度约束的T2,cutoff优化方法

A T2,cutoff Optimization Method Constrained by Irreducible Water Saturation Obtained in Petrophysical Experiment

核磁共振T2谱包含储层孔隙结构和流体的重要信息,通过对鄂尔多斯盆地不同地区不同层位核磁共振岩石物理实验T2谱与核磁共振测井T2谱之间对应关系进行定性与定量研究,分析两者展布区间、形态差异及束缚水饱和度在油气生产过程中的意义,提出了一种基于实验室核磁共振测量束缚水饱和度约束的T2,cutoff优化方法,有效解决了利用核磁共振岩石物理实验标定核磁共振测井的难题,提高了核磁共振测井储层评价的精度。

Nuclear magnetic resonance(NMR) T2 spectrum contains important information of reservoirs, such as pore structure and fluids. However, no effective solutions have been made on fully tapping the information of T2 spectrum and using the petrophysical data to calibrate NMR logging. Based on the qualitative and quantitative study of the correlation between the NMR petrophysical T2 spectra and the logging T2 spectra of rocks at different horizons in different areas of the Ordos Basin, the distribution range, morphological differences and the significance of irreducible water saturation in oil and gas production are analyzed. Finally, a T2,cutoff optimization method constrained by irreducible water saturation obtained in laboratory NMR measurement is proposed. This method can effectively facilitate the NMR logging calibration by NMR petrophysical experiment, and improve the accuracy of reservoir evaluation by NMR logging.