Abstract：A special sandstone reservoir was detected in the Shaximiao Formation in the interpretation of the multi-component seismic data of the Qiulin area, Sichuan Basin. The reservoir has vague reflection characteristics on P-wave profiles, which can hardly be discovered, while on the converted wave profiles, the reflection characteristics are distinct and can be identified. The multi-component seismic data is acquired by dynamite sources and DSU3 digital three-component geophones. Seismic data processing aims to preserve PP- and PS-wave amplitude. To tackle the low signal-to-noise ratio of PS waves, the amplitude and fidelity-preserved multi-domain and multi-step noise attenuation technology is performed to improve the signal-to-noise ratio of PS-wave data. On the basis of the calibration of logging and seismic data, target PP- and PS-wave horizons are interpreted, and the PS-wave horizon is taken as the benchmark to be corrected to the time domain of PP waves. In this way, the PP waves and PS waves can be matched in the time domain. According to multi-component seismic interpretation results, the following conclusions are drawn: 1 The P-wave velocity of sandstone in the Shaximiao Formation is sensitive to porosity, and consequently, the reflection amplitude of PP waves is significantly affected by the porosity of sandstone. Due to the combinations of elastic parameters such as P-wave velocity and density of sandstone, concealed channel sandstone has vague reflections on PP-wave profiles within a specific range of porosity, which are concealed in mudstone and thus can hardly be identified. Such reservoirs were often omitted in the exploration. 2 The reflection amplitude of PS waves is insensitive to porosity changes and thus is superior to that of PP waves in lithology prediction. When the multi-component seismic data is used for attribute analysis, the spatial distribution of channels can be delineated. The above conclusions are validated by drilling results, and extensive channel sandstone which was undetected in previous PP-wave surveys in the Shaximiao Formation is discovered by multi-component seismic data. The research result lays a good foundation for further exploration deployment.
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