相对等时面在东胜气田盒2+3段河道识别中的应用

Application of relative isochronous surface in channel identification of He2+3 members in Dongsheng gas field

东胜气田下石盒子组盒2+3段为典型的辫状河沉积,纵向、横向发育不同期次规模河道,相互叠置,厚度不等,具有典型的透镜状特征,河道宽度200~600 m,且分布特征不清晰。地震属性能够较好地反映河道展布,属性平面具有条带状与片状特征,强振幅条带储层物性具有较好响应特征,片状次之。因此,需要从片状地震属性中找出条带类型。根据沉积分布特征,确定地震相对等时面,应用地层切片技术,对不同期次河道进行精确识别与刻画,精细预测薄储层。

The He2+3 members of the lower Shihezi formation in Dongsheng gas field are a typical braided river deposit,with channels of different stages and sub scales developed longitudinally and transversely,overlapping each other and varying in thickness,with typical lenticular characteristics,channel width of 200-600 m.The distribution characteristics are difficult to grasp.Seismic attributes can better reflect the distribution of river channels,and the plane characteristics of strip and sheet attributes.The strip band with strong amplitude has better response characteristics of reservoir and physical properties,followed by sheet band.Therefore,it is necessary to find out the strip band from the sheet band.According to the characteristics of sedimentary distribution,the relative isochronous surface of seismic attribute is determined.Through the application of formation slicing technology,the accurate identification and characterization of river channels in different periods and the fine prediction of thin reservoirs are realized.