Abstract: 2D seismic project in Langzhong-Guang'an area has been operated over years and crossed vast terrain with strong ground roll. The target is thin layers deposited on flow phase with low porosity and low permeability, changing a lot laterally. Dependent on reliable enclosure checking procedures to timing and energy distribution in the seismic data volume, high-quality gathering and final results are provided for structure interpretation and reservoir prediction by laying emphasis on preserving preservation of amplitude and fidelity. Those elastic parameters relatedwith lithology and hydrocarbon potential, i.e. ratio of P/S wave and Poisson's ratio, are obtained after prestack inversion. Prediction of reservoir and hydrocarbon potential is carried out through statistics and cross-plot analysis of reservoir sensitive parameters, and remarkable geological results are obtained.

Key words: low porosity and low permeability reservoir, elastic parameter, Poisson's ratio, Sichuan Basin, Langzhong-Guang'an area