The invention relates to a geophysical oil gas prospecting method which is capable of accurately evaluating targets containing oil gas in clastic rock basin and based on resistivity and induced polariThe invention relates to a geophysical oil gas prospecting method which is capable of accurately evaluating targets containing oil gas in clastic rock basin and based on resistivity and induced polarization effect and comprises the specific steps of collecting data from a target area, processing the collected data on time domain and frequency domain, obtaining all-time apparent resistivity and phazation effect and comprises the specific steps of collecting data from a target area, processing the collected data on time domain and frequency domain, obtaining all-time apparent resistivity and phase curve, drawing a plane anomaly chart of polarization effect, and comparing the chart with the anomaly mode of an oil gas reservoir to determine oil-bearing trap as well as the position border of thse curve, drawing a plane anomaly chart of polarization effect, and comparing the chart with the anomaly mode of an oil gas reservoir to determine oil-bearing trap as well as the position border of the oil reservoir and accurately recognize the favorable targets containing oil gas. The invention adopts a high-precision artificial source time frequency deep sounding method for sounding the solid che oil reservoir and accurately recognize the favorable targets containing oil gas. The invention adopts a high-precision artificial source time frequency deep sounding method for sounding the solid change of electric properties from shallow to deep, including resistivity R and polarizability IP, thus being capable of accurately recognizing the favorable targets containing oil gas and further improange of electric properties from shallow to deep, including resistivity R and polarizability IP, thus being capable of accurately recognizing the favorable targets containing oil gas and further improving the success ratio of drilling.ving the success ratio of drilling.