Abstract

The seismic response of a shale is a direct result of the original mineral composition, textural configuration at deposition, and degree of compaction. The aim of this article is to show how the compactional processes and mineralogical effects can be directly identified by rock physics techniques and to emphasize the importance of having a thorough geological understanding when doing rock physics analysis. To succeed, we must first understand the fundamental relationships between sedimentology, the compactional processes, and the expected rock physics response that are not restricted to a particular basin or data set. To achieve this, we used wireline logs from 100 wells on the mid-Norwegian shelf to establish robust rock physics background trends in shales that were compared with the local responses in and around a target area. The target was the Tulipan well in the southwestern part of the mid-Norwegian shelf where thick deposits from the glacial-marine North Sea Fan are located.

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