Abstract: The Kexia sub-formation in west No.1 distribution in Karamay oilfield is a well-developed fan delta depositional system whose sand body types consist of braided channels, channel bar, channel margin, interchannel mud, underwater distributary channel, underwater distributary channel margin, underwater distributary interchannel mud, distal bar, pre-fan delta mud. By using cross-hole simulation technique and well logs, four superposition patterns of complex channels are identified: isolate type, butt joint type, cut overlapping type and superimposed type. Meanwhile, according to the cross-hole simulation and the six principles of sand body lateral comparison (height difference, thickness difference, configuration difference, range difference, rhythm difference and quality (productivity) difference), the vertical and horizontal characteristics of the sand body of the Kexia sub-formation are obtained, which can support adjustments for further field development in this area.

Key words: west No.1 district, fan dalta, single sand body, cross-hole simulation