Abstract:The 3-D seismic exploration in Span-231 well zone is first large areal 3-D seismic exploration in Ordos Basin,which main purpose is to describe accurately the H$ sand reservoir and provide drilling site of horizontal drilling.On the basis of synthetically analyzing geologic,loggrog and seismic data in studying area,the paper uses integrative reservoir prediction techniques such as subtle structure interpretation and attribution analysis,seismic facies analysis and seismic inversion to interpret and predict the structures and reservoirs of the region accurately and to provide suggestion drilling sites for horizontal drilling,which provides a reliable basis for following gas development.