川西坳陷须家河组小波域层间吸收属性应用研究

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。

A study on application of interbed absorption attribute in wavelet domain to the Xujiahe Formation in western Sichuan Depression

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.