应用核磁共振测井资料评价疑难储集层

应用核磁共振测井资料可以对一些疑难储集层进行准确的评价,比如火成岩、低孔隙度低渗透率泥质砂岩、低电阻率产层等复杂油气层等.提供了用核磁共振测井资料评价几种疑难储集层的解释方法.从T2截止值的分布上对储集层和非储集层划分;从T2谱的前后、高低等特征识别水层、稠油层、气层;根据标准T2的长短、差谱上的剩余信号分布、移谱图上长回波间隔T2的前移程度来划分此类储层是产层、低产层还是干层,并判断流体性质是气、稠油、轻质油还是水;从双TE(移谱图)上可动流体扩散的快慢来判断流体的性质,进而识别低电阻率油层.列举了4口井的应用实例.

Using NMR Logging Data to Evaluate Difficult Reservoirs

We usually use NMR logging data to evaluate difficult reservoirs, such as volcanic, massive low-porosity and low-permeability shaly sandstones, low-resistivity/low-contrast pay zones and complex oil and gas reservoir, etc. Introduced are some useful NMR logging interpretation methods for tough reservoirs identification. T2 cutoff distribution is used for zoning reservoirs and non reservoirs; Dual peak features of T2 spectrum are used for water, viscous oil zone and gas identification; Lengths of standard T2 spectra, remaining signal distribution on the dual- Tw measurements and T2 forward travels on the dual- TE measurements allow us to verify that the glutinite reservoir is a pay zone, a poor producing zone or a dry zone, and the fluid there is gas, viscous oil, light oil or water. Moveable fluid dispersion velocity on the dual TE measurements may also help us to determine the fluid property so as to identify the low resistivity oil zone. Application examples of 4 wells are given.