Event Location:
CGG
10300 Town Park Dr.
Houston, TX  77072

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Speaker: Michelle Ellis, Rock Solid Images

As sediments are buried they undergo both mechanical and geochemical processes that reduce the original depositional porosities. Among them, compaction and cementation are two of the most important factors that decide the final porosity of these rocks. To understand the resulting petrophysical properties and their corresponding elastic response remains an important and challenging topic for rock physics.

In this lecture we will explore how cementation and compaction affects the properties of the rock and review rock physic models which estimate the effective properties. A hybrid rock physics model, which considers both compaction and cementation effects, will be presented. This model considers the full burial history of the rock rather than individual processes. The overall modelling strategy combines the unconsolidated sand model, the contact cement model, and an inclusion model.

The workflow allows us to perform quantitative analysis and interpret different porosity reduction stages within reservoir rocks which have undergone severe mechanical and geochemical processes. With the guide of geological information, depositional and burial history, this workflow also provides a means to predict the geophysical responses of reservoir rocks, away from well control. The modelling workflow is demonstrated on well log data and published laboratory data.

Speaker Biography: Michelle Ellis, Rock Solid Images
Michelle Ellis is a rock physics researcher specializing in elastic and electrical effective medium modelling. She is currently at Rock Solid Images (RSI) in Houston developing novel rock models and workflows for multiphysics reservoir interpretation. She is also involved in implementing those models and workflows in RSI’s rock physics modelling software package (iMOSS) and RSI’s new suite of Petrel plugins for joint seismic and electrical interpretation.

Prior to this she undertook 2 postdoctoral projects, one at the National Environmental Research Council (NERC) and the other at University of Southampton (UK). She obtained her PhD in Marine Geophysics also from the University of Southampton investigating the elastic and electrical properties of gas hydrate saturated sediments.

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