徐深气田中基性火山岩气水层测井识别

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。

Identification of gas and water layers by log interpretation in intermediate-basic volcanic rocks in Xushen gas field

The basic volcanic reservoirs in Xushen gas field, Songliao Basin, are characterized by complex lithology, and a large variation of matrix density. The impact of lithology on log data is commonly greater than that of reservoir fluids. Moreover, the alteration of rocks and the existence of metallic minerals can lower the resistivity, making it difficult for the log data to reflect the true fluid properties. Therefore, identification of gas and water layers in the intermediate basic volcanic rocks is more difficult than that in the acidic volcanic rocks. The advantages of different log data were fully utilized and background value parameters that are sensitive to gas and are less influenced by lithology were selected, and three methods, including dual density superimposition, the ratio of shear slowness to compressional slowness, and nuclear magnetic logging, were integrated to determine the fluid property of the intermediate basic volcanic reservoirs. The coincidence rate between the interpretation and formation testing results of 18 exploratory and appraisal wells in the study area is up to 92.3%, which proves that this method has achieved good results in volcanic gas fields.