Abstract: In the Shengli oil field, there are a number of low-resistivity pay sands whose resistivity approximates to that of the aquifers, and their discovery has added to the wealth of our knowledge about the pay sands. Drawing on the data from the scanning electron microscope and gamma diffraction, the paper attempts to expound the lithology of the low-resistivity pay sands, the nature and distribution of clay contained in the sands and their pore structure and wettability. In fact, low-resistivity pay sands are caused by the high water saturation of the sands that contain primarily bound water. This knowledge which constitutes an important theoretical ground for analysing log data and identifying pay sands is in some way significant in that it helps increase the chances of success in the interpretation of log data and discovery of more oil reserve.

摘要： 低电阻率油气层的发现扩大了认识油层的领域。当证实它们的电阻率有时接近于同样条件的水层,认真探讨其机理成为普遍关注的问题。尤其是我国一些含油盆地中低电阻率砂岩油气层比较普遍,进一步揭示这些问题,对于提高解释成功率有着重要的意义。伴随扫描电子显微镜和x-光衍射等技术的应用,使低电阻率油气层机理的研究有了明显的进展。