Abstract: Interpretation methods of interlayer traps are introduced in this paper. Firstly, segment logging curves and abtain velocities with variable - Voand variable - β to ensure that depth time conversion is accurate;secondly synthesize near- wellbore seismic traces through constrained inversion to nnely calibrate seismic renection horizonsi finally,quantitatively study interlayer traps with lateral reservoir prediction methods and map interlayer trap top structures and reseroir thickness. These methods were applied in Wellblock B93 in Biyang sag, 3 interlayer traps with a total area of 5.03 km2 were discovcred.They are new targets for petroleum exploration in this area.