Abstract：In recent years, with the continuous improvement of exploration degree, lithologic reservoirs have gradually become an important exploration target in Fushan Sag. The Cenozoic volcanic activity in the sag is frequent, and there are large areas of volcanic rocks in the surface, shallow, and medium deep layers, which results in the narrow frequency band, poor imaging quality, and low resolution of seismic data. Paleogene Liushagang Formation is the main exploration target stratum in the sag, and its reservoirs have thin single layers, rapid lateral change, and interbeds of sand and mudstone, which can hardly be predicted. Hence, efforts are made to overcome the difficulties in the lithologic reservoir exploration of Fushan Sag. Firstly, through the study of seismic stratigraphy, together with the analysis of seismic reflection characteristics and seismic structural attributes, fine interpretations are carried out to establish a high-resolution isochronous stratigraphic framework. Then, under the constraints of the stratigraphic framework, reservoir prediction is conducted by the use of seismic attribute analysis and post-stack pseudo-acoustic inversion technology. Finally, the hydrocarbon-bearing range is predicted by the post-stack hydrocarbon detection principle of "low-frequency resonance and high-frequency attenuation." The technical means mentioned above have achieved good results in the exploration of lithologic reservoirs in Fushan Sag.
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