【摘要】 地震波穿过地层时会发生频散和衰减,岩层中含有油气等流体时,频散和衰减有其特殊性,双相介质理论能很好地刻画地下介质含有流体时的情况。本文基于双相介质理论公式,研究流体参数和频率对地震波衰减和频散的影响规律。结果表明:地震波低频成分衰减较弱,高频成分衰减较强;黏弹性强的流体频散强,粘弹性低的流体频散弱;衰减和频散可以作为油气存在的标志。文中通过广义S变换,对实际地震资料计算,较准确地提取地震波的低频、高频能量和频散特征曲线,并对实际资料进行了含油气性预测,取得了与钻井一致的结果。更多还原

【Abstract】 The seismic wave attenuates and disperses when it is propagating through the subsurface hydrocarbon area.The dual-phase media theory can simulate the real subsurface media with fluids.The seismic attenuation and dispersion under the influence of fluid coefficients and frequency is discussed based on the theory of dual-phase media theory.The results show that the low frequency energy is relatively higher and the high frequency energy is relatively lower as a result of the attenuation.The porous fluid with high viscoelasticity generates strong dispersion while the low-viscoelastic fluid generates weak dispersion.Attenuation and dispersion can be the sign of oil and gas existence.In this paper,the S-transform is used to extract the low frequency energy,high frequency energy and dispersion attributes of the seismic data.These attributes are applied to predict the hydrocarbon areas.The results are accordant with the well data.更多还原