摘要
对地震波信号进行时频分析,从而获得地震波的吸收衰减梯度,可以用于储集层含油气性的检测,可是当地震记录中的高频或低频成分受干扰较强时,单一的吸收衰减就不能很好地用于检测油气。采用时频分析较为准确的小波变换用以求取地震波的低频带和高频带吸收衰减梯度,运用组合频率衰减梯度属性预测含油气性。正演模拟和应用的实际结果表明,采用组合频率衰减梯度预测致密含气砂岩储层效果不错,能够准确地指示油气富集区。
The absorption attenuation gradient of seismic waves was obtained from the time-frequency analysis of the seismic signal,which could be used for detecting hydrocarbon bearing property in the reservoirs.But when serious interference was induced in high frequency or low frequency component,the absorption attenuation could not be used for testing the oil and gas well.The wavelet method is adopted to calculate the low frequency and high frequency absorption attenuation gradient in this paper.And the combined frequency attenuation gradient attribute is used for petroliferous prediction.The forward modeling and application results show that the good results are obtained in the prediction of the tight gas-bearing sandstone reservoir by using the combined frequency attenuation gradient and the oil-gas accumulation areas can be accurately indicated.
出处
《石油天然气学报》
CAS
CSCD
2014年第11期78-82,6,共5页
Journal of Oil and Gas Technology
基金
国家自然科学基金项目(41074104)
关键词
小波变换
高频
低频
组合频率衰减梯度
wavelet transform
low frequency
high frequency
combined frequency attenuation gradient
