Abstract: Based on the characteristic of mid-lower part of lithosome or sand body of Y anchang formation of late Triassic in Jiyuan area, Ordos basin, multiple geologic models for sand-shale-based combinations are designed for the purpose of reducing the interpretation ambiguity of sedimentary system, and the forward modeling is conducted. The seismic response features of individual model are summarized. The results of forward modeling are proven to be helpful to interpret and predict the thickness and distribution of lithosome or sand bodies qualitatively and quantitatively.

Key words: Ordos basin, geological model, seismic forward modeling, reflection feature