The discovery of the giant gas reservoir in the Leshan-Longnüsi paleo-uplift in the central Sichuan Basin reveals the immense exploration potential of the Lower Cambrian Longwangmiao Formation. Well WT1 in eastern Sichuan also encountered a beach facies reservoir with 12 m thickness in the Longwangmiao Formation, suggesting that gas reservoirs in this formation could expand further towards the eastern and northern parts of the Sichuan Basin. However, drilled wells indicate that the Longwangmiao Formation reservoirs in eastern Sichuan are thin, seismic data have low vertical resolution, and the reservoir prediction results are prone to significant errors, which cannot meet exploration needs. To address this issue, a physical model was constructed based on the drilled well information, and some forward models are conducted to study the seismic response characteristics of reservoirs under different thicknesses, porosities, and superposition patterns. On this basis, amplitude-preserving, high-fidelity, high-resolution processing of seismic data and post-stack seismic impedance inversion were carried out to predict the lateral distribution characteristics of the reservoirs. The research results show as follows. The spectral inversion method can improve the vertical resolution of the Longwangmiao Formation seismic data in eastern Sichuan. The dominant frequency of the seismic data increased from 25 Hz to 45 Hz, and the bandwidth expanded from 10 ~ 45 Hz to 10 ~ 80 Hz. Well-to-seismic calibration results indicate that the obtained high-resolution seismic data retain amplitude fidelity. Based on the high-resolution seismic data, post-stack seismic impedance inversion is performed, and the inverted impedance data volume can identify reservoirs with a thickness of 12 meters in the Longwangmiao Formation. The research results have improved the accuracy of reservoir identification in the Longwangmiao Formation in eastern Sichuan, providing a reliable basis for oil and gas exploration and development in the area.