核磁共振测井在大庆长垣以西地区流体性质识别中的应用

Application of NMR Logging in Fluid Identification in the Western Area of Daqing Changyuan Oilfield

大庆长垣以西地区储层非均质性强,油水层差异小,常规测井解释符合率一直不高,但该地区储集层属中孔隙度、中低渗透率储层,较适宜利用核磁共振测井进行流体性质识别。通过对大庆长垣以西地区核磁共振测井识别流体性质的3种方法进行优选,确定适合该地区的核磁共振测井模式,在定性识别流体性质的基础上建立了核磁共振测井流体性质识别图版,实现了定量解释。该方法在B井工业油流井发现中发挥了关键作用,有效地解决了该地区流体性质识别难问题,并在实际生产中得到了较好的应用。

The reservoir in the western area of Daqing Changyuan has the characteristics of strong heterogeneity and small difference of oil and water layer,and the coincidence rate of conventional logging interpretation cannot meet the production need.However,the reservoir belonged to the middle porosity and medium-low permeability reservoirs in this area,which was more suitable for fluid identification by using NMR logging.Based on the optimization of 3 kinds of NMR fluid identification methods in the west area of Daqing Changyuan,the NMR logging model suitable for this area was determined,and on the basis of qualitative identification of fluid properties,the NMR fluid properties identification plate was established,and the quantitative interpretation of fluid properties was realized.This method played a key role in the discovery of industrial oil flow wells-Well B,effectively solved the problem of fluid identification in this area and has been better applied in practical production.