基于叠前地震资料AVO信息在东胜气田隐蔽河道识别的应用

Application of AVO based on pre-stack seismic data in subtle channel identification of Dongsheng gas field

东胜气田什股壕气区下石盒子组盒2、盒3窄河道为典型的限制型辫状河道,河道窄(300~1000 m),单期砂体厚度薄(5~10 m),叠置模式多样。“亮点”强振幅属性等地震易识别的厚砂体(大于10 m)河道已基本动用。为此,利用现有地震资料提高河道识别精度,提出了基于叠前CRP道集优化进行AVO单井分析。通过分偏移距部分叠加,选择保真度高、频带宽的数据体,应用地层切片技术,可进一步识别隐蔽性河道空间展布,提高了钻井成功率。

As typical restricted braided channels from 2^(nd) and 3^(rd) members of lower Shihezi formation in Shiguhao block of Dongsheng gas field,the channels are characterized by narrow width(300~1000 m),small single layer thickness(5~10 m)and various superimposed modes.The thick sand body(greater than 10 m)with strong amplitude attributes and easy identification by seismic has been basically used.Therefore,by using the existing seismic data,the accuracy of river channel identification is improved,and an AVO single well analysis based on pre stack CRP gather optimization is proposed.Through partial stacking of offsets,selecting data volumes with high fidelity and bandwidth,and the application of stratum slicing technology,the spatial distribution of hidden river channels is further identified,which will improve the success rate of drilling.