低频伴影技术在生物礁油气储层预测中的应用

含油气岩石对地震波的能量有衰减作用。当地震纵波穿过含油气地层时,波的能量将产生较大的频率衰减,在储层下方会出现低频强振幅的"低频伴影"现象。在低频率段,"低频伴影"特征明显,"低频伴影"的地震波反射能量较储层的地震波反射能量强。在高频率段,"低频伴影"的地震波反射能量较储层的地震波反射能量弱并随着频率升高逐渐减弱。选择川东北SYB1井区对"低频伴影"技术在生物礁油气储层预测中的应用进行研究,通过SYB1井和SYBc1井两口钻井的应用特征对比,有效结合"低频伴影"技术在含油气储层预测中的识别标志,得出"低频伴影"技术进行生物礁油气储层预测的适应性,证明了方法的正确性,为同类型油气储层预测工作提供参考依据。

Application of Low-Frequency Shadow Technology in Prediction of Organic Reef Oil and Gas Reservoir

Rock with oil and gas can make attenuation to seismic wave. When seismic primary wave goes throw oil and gas formation, it will engender serious attenuation. Then, the low-frequency shadow with character of low frequency and strong amplitude will appear under the reservoir. In low frequency stage, low-frequency shadow is obvious, and the power of seismic reflection wave is stronger than the power of reservoir. In high frequency stage, the power of low-frequency shadow is lower than the power of reservoir and with the frequency goes up, the power weaken. In this paper, the author chooses well SYB1 district as the research objective to study the application of low-frequency shadow technology in prediction of organic reef oil and gas reservoir. With the comparing of application character of well SYB1 and SYBc1, connected to the identification mark of low-frequency shadow technology in the prediction of oil and gas reservoir, the author finds out that low-frequency shadow technology is suitable in the prediction of organic reef oil and gas reservoir. And this study proves the low-frequency shadow technology is valid, which will be the reference frame for the reservoir prediction of the same style.