Abstract: Strong heterogeneity is in the Bohai A oilfield reservoir and great change of thickness and physical property exist horizontally,and potential of sandbodies oiliness is not clear.These factors of uncertainty brings bigger risk to the oilfield development design and implementation.Through such combined geophysical technology as composite calibration of horizon,seismic attributes analysis,prestack inversion ISIS and lithologic body assortment,the response feature analysis,distribution scope and physical property of the reservoir has been better recognized,potential of oiliness has been predicted more accurately,which make further guidance to sand body track description,well location optimized fitting,capacity upgrade evaluation and guarantee the smooth oilfield development.