The Application of Near-Surface Structural Analysis Techniques to Identifying Seismic Anomalies Related to Biogas

Seismic anomalies are widespread in the Sanhu area of the Qaidam Basin, and are manifested as low frequency, low velocity signals showing a pushdown of the seismic event. Some anomalies are caused by underground gas, and some are caused by near-surface lithologic variation. This paper uses near-surface structural analysis techniques based on near-surface survey data, sub-stack seismic sections of different offset, and seismic stack sections to determine the source of the anomalies. The research identifies seismic anomaly distribution related to underground gas areas, as well as those areas only affected by near-surface structure. According to accurate analysis of near-surface structure, we can discriminate between true and false gas anomalies and build a solid foundation for solving the static correction problem.