基于反褶积广义S变换的双相介质理论油水识别法在渤海S油田馆陶组的应用

受限于地震资料分辨率较低,渤海S油田馆陶组的复合叠置砂体中的单砂体顶底识别较困难;且在时—空域里,地震反射特征相似的砂层组出现截然不同的流体类型,油水关系非常复杂。为此,本文首先开展了反褶积广义S变换的时频分析,参照已钻井的地震反射特征,优选低频、高频属性体;其次进行储层顶、底的准确识别;利用双相介质理论进行油、水的频谱特征差异分析。分析表明,油、水层在频率域的地震响应有较明显的特征,频率类的属性对地震波的高频衰减较敏感;通过优选该油田主力油层的低频、高频属性体数据及储层顶、底的频谱衰减差异的平面数据,共同构建一个新的流体识别因子,进行油水识别,并取得较好的效果,助力剩余10余口开发井的布署和实施。

The application of seismic oil-water identification method to Guantao Formation of Bohai S oil field

Restricted by the low resolution of seismic data,the identification of the top and bottom of a single sand body is difficult in the composite superposed sand bodies of the Guantao Formation in the Bohai S oil field.Moreover,in the time-space domain, sandstones with similar seismic reflection characteristics have very different fluid types,and the oil-water relationship is very complicated. In view of such a situation,based on the two-phase medium theory and the theory of viscous dispersion wave equation,the authors first carried out the time-frequency analysis of the generalized S transform,and selected the low-frequency and high-frequency attribute bodies with reference to the seismic reflection characteristics of the drilling well.Secondly,the top and bottom of the reservoir were accurately identified.Then the analysis of the difference of the spectrum characteristics of oil and water was conducted.The result shows that the seismic responses of the oil and water layers in the frequency domain have obvious characteristics,and the frequency-type attributes are more sensitive to the high-frequency attenuation of seismic waves.By optimizing the low-frequency and high-frequency attribute volume data of the main oil layer of the oil field and the plane data of the spectral attenuation difference between the top and bottom of the reservoir,a new fluid identification factor was jointly constructed to identify oil and water and achieved better results to help the remaining deployment and implementation of more than 10 development wells.