基于小波变换的频率衰减梯度属性含气性检测
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摘要
时频分析是实现地震分频解释的重要手段,提高时频分析方法的精度和分辨率至关重要。根据岩性油气藏的特点,提出了利用基于小波变换的时频分析方法进行岩性油气藏储层预测的思路,此方法克服了传统傅立叶时频转换时的时窗问题,提高了地震资料频域内的分辨能力。散射理论的研究结果表明当地层中储层含油气时,由于弹性系数、阻力系数、密度、速度发生大的变化,其固有频率显著改变,表现在频段上为低频共振能量增强,高频衰减能量变弱的现象,研究实例表明频率衰减梯度检测技术可以作为一种储层预测和油气检测的有效直接方法。
Time-frequency analysis is a very important method of achieving seismic spectral decomposition interpretation,and it is essential to improve accuracy and resolution of Time-frequency analysis method.According to the characteristic of lithologic hydrocarbon reservoir,we proposed idea of using wavelet transform based Time -frequency analysis method to predict lithologic hydrocarbon reservoir.The method of Time-frequency analysis basing on wavelet transform overcome the traditional Fourier Time- frequency conversion of the time window problem,and improve resolution capability of seismic data in frequency domain,The research results of scattering theory show that when the reservoir have oil and gas,its inherent frequency change greatly for the changes of elastic modulus,resistance coefficient,density,velocity.The changes of its inherent frequency represent in that low frequency is resonance that its power is enhance.the high frequency is attenuation that its power die down.A case of study show that frequency attenuation gradient detection techniques can be used as a effective aids of reservoir prediction and hydrocarbon detection
Time-frequency analysis is a very important method of achieving seismic spectral decomposition interpretation,and it is essential to improve accuracy and resolution of Time-frequency analysis method.According to the characteristic of lithologic hydrocarbon reservoir,we proposed idea of using wavelet transform based Time -frequency analysis method to predict lithologic hydrocarbon reservoir.The method of Time-frequency analysis basing on wavelet transform overcome the traditional Fourier Time- frequency conversion of the time window problem,and improve resolution capability of seismic data in frequency domain,The research results of scattering theory show that when the reservoir have oil and gas,its inherent frequency change greatly for the changes of elastic modulus,resistance coefficient,density,velocity.The changes of its inherent frequency represent in that low frequency is resonance that its power is enhance.the high frequency is attenuation that its power die down.A case of study show that frequency attenuation gradient detection techniques can be used as a effective aids of reservoir prediction and hydrocarbon detection
引文
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[19]尹陈,贺振华,等.基于波动方程的地震波衰减理论研究及应用[J].成都理工大学学报(自然科学版),2008,35 (3):263-267.
[2]高建虎,雍学善.频率域储层预测技术研究[J].天然气地球科学,2007,18(6).
[3]几种时频分析技术的性能研究及在河道砂体预测中的应用[J].2007,27(增刊A):451-453.808-812.
[4]黄中玉,王于静,等.分频技术在气层识别中的应用[J].勘探地球物理进展,2008,31(1):73-76.
[5]陈学华.时频域油气储层低频阴影检测[J].地球物理学报,2009,52(1):215-221.
[6]Gennady Goloshubin,Connie Van Schuyver,Valeri Korneev, Dmitry Silin,and Vjacheslav Vingalov.Reservoir imaging using low frequencies of seismic reflections.The Leading Edge,May 2006;25:527-531.
[7]周刚,郑荣才.川东—渝北地区长兴组礁、滩相储层预测[J].岩性油气藏,2009,21(1):15-21.
[8]李晓春,王祝文.Hilbert-Huang变换在提取声波测井信号储集特性中的应用[J].岩性油气藏,2009,21(1):107-111.
[9]罗家寨构造嘉陵江组嘉四2段底部裂缝预测[J].岩性油气藏,2009,21(4):82-86.
[10]张永珍,张帆.川东地区寨沟构造嘉二段储层特征及平面分布规律[J].岩性油气藏,2009,21(2):76-81.
[11]熊翥.地层岩性油气藏勘探[J].岩性油气藏,2009,20(4): 1-8.
[12]黄中玉,王于静,苏永昌.一种新的地震波衰减分析方法——预测油气异常的有效工具[J].石油地球物理勘探,2000,35(6):768-773.
[13]蔡涵鹏.频率信息在碳酸盐岩礁滩储层在含油气性预测中的应用[J].岩性油气藏,2008,20(4):113-117.
[13]Klimentos T,McCann C.Telationships among compressional wave attenuation,porosity,clay content,and permeability in sandstones[J].Geophysics,1990,55(10),998-1014.
[15]JOHN P.CASTAGNA and SHENGJIE SUN,ROBERT W. SIEGFRIED et al.Instantaneous spectral analysis: Detection of low-frequency shadows associated with hydrocarbons.The leading edge,2003,120-127.
[16]叶朝阳,秦启荣.川西飞仙关组海相碳酸盐岩储层特征与评价[J].岩性油气藏,2009,21(1):61-65.
[17]毕研斌,龙胜祥,郭彤楼,等.应用频率衰减属性预测TNB地区储层含气性[J].石油与天然气地质,2007,28(1): 116-120.
[18]刘喜武.地震时频属性及其在油气地震地质技术中应用的综述[J].勘探地球物理进展.2009,21(1):18-22
[19]尹陈,贺振华,等.基于波动方程的地震波衰减理论研究及应用[J].成都理工大学学报(自然科学版),2008,35 (3):263-267.
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