Drilling method and system

The invention relates to the field of petroleum and natural gas exploration and provides a drilling method and system. The drilling method comprises the steps that based on the analysis of the lithologic characters and the electric characteristics of a reservoir of a target stratum, forewarning control points are arranged in the track of a drill bit aiming at the reservoir; on the basis of seismicinterpretation data and a geological model, structure interpretation comparison is conducted on the target stratum, and the structure form and the excellent shale distribution characteristics are analyzed so as to determine the vertical depth and coordinates of an A target point; the position of the drill bit in the vertical direction is judged through while-drilling natural gamma measurement andspecial logging real-time data, the stratum dip angle is calculated, and the strike of a stratum near the drill bit is predicted; according to the stratum dip angle, the drill bit is controlled to land at the A target point;