Abstract
In a sand dune area, the LVL (low velocity layer) mainly comprises two layers: loose dry sand and water-saturated sand. These two layers are totally different in P- and S-wave velocities. When a 3C survey is conducted, a serious static problem arises. This means that 3C data processing has to put the emphasis on S-wave statics estimation. In the Sulige gas field of the Erdos basin, China, 2D/3C and 3D/3C seismic surveys were conducted successfully by BGP from 2002 to 2004. The main purpose of the surveys was to improve the sand channel interpretation and gas reservoir characterization in terms of converted-waves. Furthermore, BGP wanted to know if the PS data can be used for lithology prediction in order to discriminate between the gas sand and overbank shale, and if 3D/3C can be used for reservoir monitoring during gas production in the long run.
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