川西坳陷须家河组小波域层间吸收属性应用研究
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摘要
基于小波理论,对地震资料进行小波域分频成像处理,具有突出地质体的局部化地质特征、储层的微观结构、反映薄互层反射的重要信息等优点。将小波域二维分频地震剖面进行重构,可以形成地震波的振幅与时间、频率直接相关的三维地震数据体。再沿目标层段或井位置点分析地震波的层间吸收属性、高频衰减特征,能够获取圈定储层与预测油气的重要参考信息。将该方法运用到川西坳陷深层须家河组气藏的储层预测与含气性检测中,获得了与测井记录吻合良好的预测效果。
Wavelet theory-based frequency-division processing of seismic data has the advantages of highlighting the local geological characteristics of geologic bodies and microstructure of reservoirs,and revealing the important information contained in thin interbed reflection.Reconstruction of two-dimension frequency-division seismic profile in wavelet domain can generate a 3D seismic data cube,of which the wave amplitude is directly related to the time and frequency.Then,important information for locating and predicting oil and gas reservoirs may be obtained through analysis of the interbed absorption attribute and high-frequency attenuation along the target layers or at the well points.Application of the technology to reservoir prediction and gas detection of the deep Xujiahe Formation in western Sichuan Depression gave out satisfactory results in accordance with log data.
Wavelet theory-based frequency-division processing of seismic data has the advantages of highlighting the local geological characteristics of geologic bodies and microstructure of reservoirs,and revealing the important information contained in thin interbed reflection.Reconstruction of two-dimension frequency-division seismic profile in wavelet domain can generate a 3D seismic data cube,of which the wave amplitude is directly related to the time and frequency.Then,important information for locating and predicting oil and gas reservoirs may be obtained through analysis of the interbed absorption attribute and high-frequency attenuation along the target layers or at the well points.Application of the technology to reservoir prediction and gas detection of the deep Xujiahe Formation in western Sichuan Depression gave out satisfactory results in accordance with log data.
引文
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2王西文.地震资料处理和解释中的小波分析方法[M].北京:石油工业出版社,2004
3李宏兵,赵文智,曹宏,等.小波尺度域含气储层地震波衰减特征[J].地球物理学报,2004,47(5):892～898
4Mallat S A.Wavelet tour of signal processing[M].San Diego:Ac-ademic Press,1999
5Chakraborty A,Okaya D.Frequency-time decomposition of seismic data using wavelet-based methods[J].Geophysics,1995,60(6):1906-1916
6印兴耀,韩文功,李振春,等.地震技术新进展[M].北京:中国石油大学出版社,2006
7王西文,刘全新,高静怀,等.地震资料在小波域的分频处理与重构[J].石油地球物理勘探,2001,36(1):78～85
8杨克明,叶军,吕正祥.川西坳陷上三叠统须家和组天然气分布及成藏特征[J].石油与天然气地质,2004,25(5):501～505
9杨克明,叶军,吕正祥.川西坳陷上三叠统成藏年代学特征[J].石油与天然气地质,2005,26(2):208～213
10曹烈,安凤山,王信.川西坳陷须家和组气藏与古构造关系[J].石油与天然气地质,2005,26(2):224～229
11杨克明.川西坳陷须家河组天然气成藏模式探讨[J].石油与天然气地质,2006,27(6):786～793
12Xu Tianji,Gan Qigang,Li Xiangui.Research and application of absorptive attenuation filtering technology based on Prony transfor-mation[M].Science Press USAInc,Geophysical Solutions for En-vironment and Engineering,2006.204～210
13李显贵,徐天吉,甘其刚.新场气田须家河气藏含气性地震检测研究[J].石油物探,2006,45(2):186～191
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