Abstract: The clasolite reservoirs in the Upper Sub-member of Third Member of Shahejie Formation in HX Area are favorable reservoirs, but it is difficult to effectively identify them with conventional superimposed seismic data under the shielding effect of igneous rocks, which seriously restricts the exploration process in this area. To address this problem, wedge model was used to verify the advantages of zero-incidence angle seismic data in thin reservoir prediction. Based on the newly acquired seismic data on "two widths and one height" in HX Area, a procedure was developed for extraction and application of zero-incident-angle seismic data. According to log curve preprocessing, shear wave velocity prediction and pre-superimposing CRP gather optimization and analysis, the zero-incidence seismic data was extracted to predict for the thin sand shale reservoir in Upper Sub-member of Third Member of Shahejie Formation. The study results proved that the zero-incidence-angle seismic data overcame the inherent defects of the superimposing results, thus obtaining the information on vertical reflection and fidelity of the stratigraphic interface, achieving a higher profile resolution, a better well-seismic coincidence and a more accurate reservoir prediction. The capability to characterize thin reservoirs was particularly outstanding. According to the results of the reservoir prediction, the predicted favorable reservoir was drilled in Well H34 located in HX Area, with high production obtained in oil production test, and more than 10 million tones of new increased oil geological reserves. The study results provide support for subsequent well deployment and reserves reporting in this area.

Key words: zero incidence angle, conventional overlay, thin reservoir, reservoir prediction, sand shale