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四川盆地川西坳陷深层上三叠统须家河组的X851井、X856井、X2井、X3井、X10井等一批高产气井证实了该区具有巨大的勘探开发潜力。然而,CX565、X201等高产水井的出现也为该区成功部署井位增添了不确定因素,因此,对该区须家河组储层气水判别就显得尤为重要。地震波在须家河组的含气储层和含水储层中传播时,在时间域内难以发现振幅、频率和能量等动力学属性的变化差异。采用时频分析技术将时间域的地震信号变换到时间—频率域进行对比分析解释,发现“低频阴影”、“高频衰减”等现象在含气储层中十分突出,而在含水储层中却不存在。利用时频域内的这些典型特征建立模式,并对该区含气储层和含水储层进行了有效的区分,其结果与钻、测井资料吻合良好。
A series of high-yield gas wells, such as X851, X856, X2, X3 and X10 wells in the Upper Triassic Xujiahe Formation in the western Sichuan Depression of the Sichuan Basin, confirm the enormous potential of exploration and development in this area. However, the emergence of high-yielding wells such as CX565 and X201 also added uncertainty to the successful deployment of wells in this area. Therefore, it is particularly important to distinguish the gas and water of the Xujiahe Formation reservoir in this area. When seismic waves propagate in the gas reservoirs and aquifer reservoirs of the Xujiahe Formation, it is difficult to find the variation of dynamic properties such as amplitude, frequency and energy in the time domain. Time-frequency analysis is used to transform the time-domain seismic signals into time-frequency domain for comparative analysis and interpretation. It is found that phenomena such as “low frequency shadow”, “high frequency attenuation” and so on are very prominent in gas-bearing reservoirs. Aquifer does not exist. These typical features in the time-frequency domain are used to establish the model, and the effective discrimination between the gas-bearing reservoirs and the aquifer in this area is made. The result is in good agreement with the drilling and well logging data.