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松辽盆地徐深气田中基性火山岩储层岩性复杂,岩石骨架密度变化大,岩性对测井的影响往往超过储层流体的影响,且岩石蚀变及金属矿物的存在使得测井电阻率降低,不能反映储层真实的流体性质,中基性火山岩气水层识别难度较酸性火山岩更大。为此,充分利用不同测井信息的优势,合理选择对气敏感、受岩性影响较小的背景值参数,综合应用双密度重叠、横纵波时差比值及核磁测井识别3种流体识别方法,判别中基性火山岩储层流体性质。通过对研究区18口探井、评价井的处理解释,经试气验证,符合率达92.3%,见到明显应用效果。
The lithology of the medium-base volcanic reservoirs in the Xushen gas field in the Songliao Basin is complex with large variations in rock skeleton density. The effects of lithology on well logging often exceed those of reservoir fluids. The rock alteration and the presence of metal minerals make the logging resistance The rate of decrease can not reflect the true fluid properties of the reservoir, and the identification of medium-basic volcanic gas-water reservoirs is more difficult than that of acidic volcanics. Therefore, taking full advantage of the different logging information, reasonably selecting the background value parameters that are sensitive to gas and less affected by lithology, three kinds of fluid identification methods are comprehensively applied, such as double-density overlap, lateral-to- Discrimination of fluid properties in medium-volcanic reservoir. Through the 18 exploration wells in the study area, appraisal well processing and explanation, the test gas validation, the compliance rate of 92.3%, to see the obvious application effect.