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

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.