网络出版日期: 2011-12-20
基金资助
国家科技重大专项(编号:2008ZX05046)资
Estimation of seismic wave energy attenuation gradient based on Pseudo-Margenau-Hill distribution
Online published: 2011-12-20
地震波在聚集了石油、天然气的储层中传播时存在能量的剧烈衰减,且频率越高能量衰减越快, 所以通过地震波高频端能量衰减梯度可以灵敏地检测地层中是否存在烃类流体。通过传统的傅里叶变换 求取地震波能量衰减梯度面临诸多问题,而伪Margenau-Hill(PMH)分布作为科恩类时频分布的一种则具 有许多优良的特性:真边缘性、弱支撑性、好的时频聚集性等。为此,该文将PMH 分布的时频分析方法引 入到了地震波吸收衰减分析技术中,利用地震波高频端能量与其对应频率的拟线性关系来计算各时刻的 地震波能量衰减梯度。实际资料应用表明,利用PMH 分布来求取地震波能量衰减梯度在储层预 测中具有重要意义。
李胜军 , 刘伟方 , 高建虎 . 利用伪Margenau-Hill分布提取地震波能量衰减梯度[J]. 岩性油气藏, 2011 , 23(6) : 106 -110 . DOI: 10.3969/j.issn.1673-8926.2011.06.020
It is stated that the propagation of seismic wave in oil & gas reservoirs is accompanied by intense energy attenuation, and the frequency component is higher, the energywill be absorbed more. Thus energy attenuation gradient can be used to detect hydrocarbon sensitively. Conventional Fourier transformsuffers fromtime-frequency resolution problems, while Pseudo-Margenau-Hill distribution has many favorable properties, such as time-frequency marginal distribution, “weak” finite support, time-frequency location, which is one ofCohen class time-frequency distribution. The time-frequency analysis based on Pseudo-Margenau-Hill distribution is presented for energy attenuation gradient estimation, and the log of energy and frequency of higher band is used to calculate the energy attenuation gradient. The practical application shows the effectiveness of the method in hydrocarbon reservoir prediction.
Key words: carbonate cave; forwardmodeling; cavewidth; cave height
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