| 摘要 |
A system and model for estimating rock properties may include receiving an initial reservoir model of the subsurface, calculating p-dependent reflection coefficients and vertical travel times at each boundary in the initial reservoir model, performing a Discrete Fourier Transform using the reflection coefficients and travel times to get a temporal spectrum of the reflectivity trace, multiplying by the temporal spectrum of a desired wavelet, performing an inverse DFT, and extracting the amplitude values at the vertical travel times for each boundary to generate synthetic seismic data. This synthetic seismic data may be compared with recorded seismic data to update the reservoir model. |
| 主权项 |
1. A computer-implemented method for modeling seismic data, the method comprising:
a. receiving, at a computer processor, an initial geologic model of the subsurface volume of interest, wherein the initial geologic model contains a plurality of surface locations, each surface location being associated with a sequence of cells along a depth axis, wherein each cell contains values of one or more reservoir properties; b. calculating, via the computer processor, p-dependent reflection coefficients at each boundary in the sequence of cells; c. calculating, via the computer processor, vertical travel times at each boundary in the sequence of cells; d. calculating, via the computer processor, a Discrete Fourier Transform (DFT) at each boundary in the sequence of cell using the p-dependent reflection coefficients and the vertical travel times associated with each boundary to generate a temporal spectrum of reflectivity; e. determining a temporal spectrum of a desired seismic wavelet; f. calculating a temporal spectrum of a time trace by multiplying the temporal spectrum of reflectivity and the temporal spectrum of the desired seismic wavelet; g. performing an inverse Discrete Fourier Transform (DFT) on the temporal spectrum of the time trace; h. extracting amplitude values for the vertical travel times at each boundary; and i. generating a modeled seismic dataset with the depth axis by assigning the amplitude values to a depth location of each boundary. |
