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S-Wave Seismic Data Interpretation for Channel Sand Reservoir at Sanhu Area, West China

Description: 

The Qigequan Formation at the Sanhu area of the Qaidam Basin in western China is a significant gas production formation. However, the conventional P-wave seismic survey conducted in this region reveals the presence of extensive gas clouds that strongly attenuate P-waves, resulting in substantial uncertainty regarding the subsurface structure. To address this challenge, we undertook a 3D9C (three-dimensional nine-component) seismic survey, producing direct S-wave data unaffected by gas clouds, yielding remarkably clearer subsurface images with a higher level of confidence. The processing of the S-wave data largely utilized conventional P-wave processing techniques, with the exception of shear wave splitting, which produced distinct Fast (S1) and Slow (S2) S-wave datasets. The shear wave splitting includes estimation of the anisotropy orientation and rotation of the horizontal components into corresponding normal and perpendicular directions Notably, the S2 data exhibited superior quality compared to the S1 data, enabling us to apply various seismic attributes techniques to extract geological features. Among many seismic attributes, we present seismic envelope and spectral decomposition with RGB blending application results. To validate our findings, we cross-referenced the seismic attributes and inversion results with well-log and production data, revealing a pronounced spatial correlation between the gas reservoir and channel structure. Consequently, we have identified channel structures as the prime targets for potential gas reservoirs.

Session: Earth’s Structure from the Crust to the Core [Poster Session]

Type: Poster

Date: 5/2/2024

Presentation Time: 08:00 AM (local time)

Presenting Author: Rui

Student Presenter: No

Invited Presentation: 

Authors