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ISIS Simultaneous Inversion



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Figure 1: Comparison of elastic inversion (left) and simultaneous inversion (right). PR log from the well inserted into the PR inversion result. To the right of the section, curves of the following are plotted: the PR log (red curve),and the inversion result (blue curve). The logs are resampled to 4 ms.

In simultaneous inversion, all the seismic data are gathered at once and inverted for angle-independent quantities [Ma, 2002]. The ISIS method uses an effective global search for finding the best subsurface model based on simulated annealing; use of trace-to-trace continuity for noise reduction; variable wavelet, both horizontally and vertically; use of low-frequency variation through prior models; and capability of handling very large datasets without segmenting the data. The ISIS simultaneous inversion method can handle several different types of seismic datasets: AVO converted wave, time-lapse full stack seismic, and time-lapse AVO.

Independent wavelets are estimated for each partial stack and vintage. Any variations in amplitude, frequency, or phase between the different seismic volumes will be captured by the wavelets. Plus, there is no need for scaling, phase rotation, or frequency balancing of the seismic data; the wavelets will do the balancing in the simultaneous inversion.

The ISIS simultaneous inversion is performed directly for the physical properties of interest. For surface seismic AVO it can be acoustic impedance (AI), Poisson's ratio (PR) and density, or AI, shear impedance (SI), and density. For PS porosity and saturation, AVO inversion the parameters are SI and density. For time-lapse full stack data the inversion is done for baseline AI and the changes in AI between each vintage. For time-lapse AVO inversion the parameters are the physical properties at the baseline, e.g., AI, PR, and density, and their changes between the different vintages. The ISIS simultaneous inversion can handle any number of vintages and any number of partial stacks for each vintage. Figure 1 shows a comparison of inversion result for separate and ISIS simultaneous inversion?showing the increased resolution and accuracy of the ISIS simultaneous inversion.


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