Abstract:Being high porous lobe body sandstone overlying SB21, the Member ZJ210 of Zhujiang Formation in deep water areas, Gasfield Baiyun shows bright spots and third AVO anomaly on seismic sections. But Member ZJ210 of Structure E in the same area is not considered as gas bearing sand as it does not shows bright spots on seismic sections. Based on series of rock physics analysis, we believe that the density, λρ and the second AVO anomaly can be used to identify gas-bearing sand reservoir when sand reservoir burial depth is greater than 2000 meters, while acoustic impedance cannot. When λρ is less than 25GPa·g/cm3, sand reservoir can be interpreted as gas bearing sand. Initial model for inversion is built on both seismic velocity volume and well data to solve lack of low frequency data. We have predicted Member ZJ210 of Structure E as gas-bearing sand reservoir based on prestack inversion and AVO comprehensive analysis. Later drilling result proves our prediction.
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