地震频谱分析在气水分布研究中的应用

Application of seismic spectral analysis to study water-gas distribution

四川石油局研究院, 成都610051

Academy of Sichuan Petroleum Administration,CHendu City,Intercode: 610051

不同频率成分的地震波在岩层中传播时的衰减是不相同的, 且岩层中孔隙流体的存在增加了这种衰减。本文从这一基本点出发, 利用地震波的连续频谱来研究地层所含流体的差别及地层岩性的变化, 进而预测气水边界和储层的横向变化, 达到了发现或预测川东地区石炭系岩性圈闭的目的。将该方法用于实际生产, 取得了较好的效果。

Attenuation varies with different frequency components when seiemie waves travel in rock formations. The effect is further enhanced in case of fluids existing in the formations. This paper utilizes continuous seismic spectra to study the difference in fluid-bearing in the formations and variations of for mation lithology. In addition, the gas-water contacts and lateral changes of the reservoirs are predicted. The goal delineating or predicting carboniferous lithological traps in eastern Sichuan thcrefore is achieved. It pays off using the method to production.