| 摘要 |
A method of predicting the pressure sensitivity of seismic velocity within reservoir rocks is presented. The method comprises defining the degree of cementation of rock as at least one of friable sand, partially cemented rock comprising a degree of cementation up to a level at which the rock is substantially non-compressible, and cemented rock comprising a degree of cementation at which the rock is substantially non-compressible. For rock comprising friable sand, a first model specifying a dependence of seismic velocity upon pressure is defined. For rock comprising partially cemented rock, a second model specifying a dependence of seismic velocity upon pressure and a weighting function accounting for a degree of cementation of the rock is defined. For rock comprising cemented rock, a third model demonstrating an insensitivity of seismic velocity to pressure is defined. Moreover, for a given dry rock moduli and porosity, the method comprises determining a degree of cementation, selecting the appropriate model, and using the selected model to predict the sensitivity of seismic velocity to pressure. |
