低频伴影快速识别与应用

Low-frequency shadow rapid recognition and application

油气的存在并不是对所有频率成分的地震信号都产生影响,它只使部分频率能量发生变化,当储层含油气时,将会引起高频能量的衰减和低频能量的增强.通过频谱分析,确定储层由于含油气引起能量变化的主要高频和低频,利用分频属性确定油气范围.时频三原色显示技术的优势在于其同时利用了高、中、低频率融合在一起显示,更直观方便的突出了地震体的优势频率,为含油气性预测提供参考.Marr小波具有计算简单、速度快,又具有良好的局部性能,可以用Marr小波模拟雷克子波对地震记录进行分频,利用三原色显示技术达到快速成像的目的.实际应用表明该方法对低频伴影能做到快速准确识别的效果,该项技术的发展将为深水少井和无井区隐蔽油气藏的研究提供有力的技术支持.

The presence of oil and gas is not an impact on all frequency components of seismic signals, it is only part of the frequency energy to change. So long as a single frequency spectrum imaging of seismic data, the use of high and low frequency spectral energy differences will be able to carry out oil and gas detection. The reservoir hydrocarbon, will cause attenuation of the high-frequency energy, and the enhancement of the low frequency energy. Spectral analysis, to determine the reservoir caused the oil and gas change of energy high and low frequency, divide property to determine the oil and gas range. The advantage lies in its frequency of the three primary colors display technology, while taking advantage of the high,low frequency together display, more intuitive and convenient to highlight the dominant frequency of seismic body and provide a reference for the prediction of hydrocarbon potential. The RGB display time-frequency technology advantage lies in its use of high, medium, low frequency together more intuitive and convenient highlights the dominant frequency of seismic body to provide a reference for the prediction of hydrocarbon potential. Marr wavelet calculation is simple, fast, and has good local performance. We can use the Marr wavelet analog Ricker wave seismic records divider. The use of the three primary colors fast imaging and display technology to achieve quick identification of low frequency associated with shadow. The use of the technology for deep-water wells and wells area less subtle reservoirs in research nrovide strong technical support.