Abstract: The Shanxi sand layer of Permian in Ordos basin is a lithologic gas pool with strong heterogeneity and characterized by few well, big well spacing and difficult prediction of reservoir quality in its early stage of development. Through the seismic attributes analysis, combined with drilling/well data, the relationship between the reservoir parameters and the seismic attribute parameters is set up. By correction of the attribute inversion data from using the drilling/well data, the reliability of reservoir characterization in non-well area can be improved. The geologic statistical analysis shows that available coal-bed correction factor could be applied to more properly get back the sandstone sensitivity to the root-mean-square amplitude attribute. According to fitting relation between the adjusted root-mean-square amplitude attribute characteristic and the sandstone thickness, the plane distribution prediction and description of the reservoir can be directly conducted for the purpose of providing references for the sedimentary facies divition in this studied area.

Key words: Ordos basin, seismic attribute, correction factor, reservoir rock, prediction