Hidden stratum pinchout line identification method

The invention discloses a hidden stratum pinchout line identification method, which comprises the following steps of: establishing a stratum overlap geological model based on a geological structure; establishing a stratum overlap forward modeling model based on a ray tracing forward modeling method; selecting a time window, and extracting a floor horizon instantaneous frequency attribute; putting the instantaneous frequency attribute above a forward modeling profile, and obtaining an earthquake overlap point by tracking an instantaneous frequency attribute abrupt change point; obtaining a stratum overlap line by combining with real drilling well data; and based on the structural difference of seismic waveforms above and below an integration surface, identifying the boundaries of pinchout lines. According to the invention, the instantaneous frequency attributes are extracted by opening the time window along the stratum floor through the reasonable time window, so that the identification of the overlap points a