地震波频率衰减梯度在油气预测中的应用

Application of frequency attenuation gradient in prediction of gas and oil potentials

研究表明,与致密的地质体相比,当地质体中含流体(如水、油或气)时,会引起地震波的散射和地震能量的衰减,断层、裂缝等的存在也会引起地震波的散射和地震能量的衰减。地震波在聚集了石油、天然气的储层中传播时,对高频成分的吸收能力更强,因此可以利用地震波的衰减属性预测油气富集区。介绍了地震波的衰减原理以及衰减属性的计算方法,利用能量吸收分析方法,通过储层频谱成像与解释软件连续计算,分析地震波频率信息的衰减梯度,在实际资料的应用中,取得了较好的效果,利用衰减梯度可以有效地预测和验证含油气区。

Studies have shown that,compared to compact geological body,scattering and energy loss of seismic waves arise when geological bodies contain fluids such as water,oil,and gas,or when faults and fractures are present.High frequency contents of seismic waves are Absorbed mostly by reservoirs when the waves spread in reservoirs containing oil or gas.This paper introduced the principles of attenuation of seismic waves,as well as the method of calculating attenuation properties.Practices show that attenuation gradient is an effective indicator of hydrocarbon enrichment.