常规测井的裂缝识别方法在砂砾岩储层中的应用

白25井区风城组裂缝较发育,对开发过程水淹、水窜产生很大的影响,然而成像测井资料相对较少,不能很好地解释研究区的裂缝发育情况。针对该问题,通过开展岩心观察和分析,尝试多种常规测井曲线(声波时差和电阻率曲线)的组合方法来开展裂缝识别。研究得出,声波时差对于研究区的高角度裂缝响应不敏感,而电阻率曲线的组合可以很好地区分裂缝和非裂缝,也可以区分裂缝的产状,从而识别出对产液有直接影响的高角度裂缝。结果表明,该方法的识别结果和岩心观察结果具有很好的对应性,识别准确性较高。

Application of crack identification method for conventional logging in glutenite reservoir

The cracks in the Fengcheng Formation of the Bai 25 well area are relatively developed,which has a great impact on the flooding and waterlogging during the development process.However,the imaging logging data is relatively small and cannot explain the crack development in the research area.Aiming at this problem,through the core observation and analysis,a combination of various conventional logging curves(sonic time difference and resistivity curve)was tried to carry out crack identification.According to the comprehensive analysis,the acoustic time difference is not sensitive to the high-angle crack response in the study area,and the combination of resistivity curves can distinguish cracks and non-cracks well,and can also distinguish the occurrence of cracks,thus identifying the direct impact on the production fluid.High angle cracks.The results showed that the recognition result of this method has a good correspondence with the results of core observation,and the recognition accuracy is high.