Abstract: Exploration degree is high in Jizhong Depression. Nearly all large-scale buried hills suitable for exploration and with small buried depth have been brought under exploration. However, exploration degree is relatively low for deep buried hills, which have a great potential for exploration and become the main exploration field at the present time. To improve the quality of seismic data and imaging precision for deep buried hills and meet the demand for exploration of super-deep subtle oil and gas reservoirs, the study has been made in light of the characteristics of deep buried hills and their inner curtains, such as large buried depth, strong subtleness, serious attenuation of seismic wave energy absorption, complicated seismic wave field, low signal-noise ratio and resolution of data, difficulty of imaging, strong heterogeneity of reservoir, difficult identification of the shapes of buried hills and their inner curtain traps. The study led to development of four key technologies-wide-azimuth high-intensity acquisition technique, low-frequency acquisition and processing technique based on target formation response frequency, technique of combining time domain with seismic exploration, and technique of quantitatively predicting heterogeneity of carbonate rock reservoir. Those technologies significantly improved the energy of seismic data and signal-noise ratio with abundant lowfrequency information and good imaging results. Deep buried hills and their inner curtain faults became clearer while the shapes of traps are easier to be identified. Good exploration results were achieved at the same time.