Low frequency models are required for seismic inversion. Low frequencies are beneficial in that they introduce absolute values, gradual changes, improved resolution, but are potentially biased. Removal of the potentially biased low frequency component to yield relative results can introduce artefacts that make interpretation complicated. Building accurate low frequency models is complicated. A number of different techniques have been introduced over the years to help improve the efficiency and accuracy of construction, which rely on an understanding of the local geology and rock physics. Despite these innovations there remain limitations that cannot be easily overcome.


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