Abstract
PS converted-waves (C-waves) have been commonly used to image through gas cloud, but the C-wave imaging may also be degraded by the diodic effect introduced by the gas cloud. For C-waves, the imaging quality may change with shooting direction due to the gas cloud, and this is referred to as the diodic effect. This diodic effect may be compensated for using a velocity perturbation method which decouples the diodic moveout into two parts: the base velocity and the velocity perturbation. In this paper, a land 2D3C seismic dataset is analyzed from the Sanhu area in the Qaidam basin, northwest China and significant diodic effects are observed in the data. The perturbation approach is applied to this data and the resultant C-wave imaging and the details of the reservoir structure are significantly improved.
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