DLP Webinar: Modelling Compaction and Cementation Effects: Hybrid Rock Physics

Webinar details
Instructor:   Dr. Michelle Ellis
Duration:   45 min + 15 min Q&A
Discipline:   Petrophysics
Main topics:   Rock Physics
Language:   English

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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.

Participants' Profile

Those interested in rock physics and improving the understanding of the geophysical response of reservoir properties.

About the Lecturer

Michelle EllisMichelle Ellis is a rock physicist and systems applications product manager with 16 years research and 9 years industry experience mainly supporting the oil and gas industry. Her main areas of expertise are in elastic and electrical anisotropy modelling, multiphysics interpretation, laboratory physical property measurements, reservoir characterization, gas hydrates and CO2 sequestration modelling and compaction modelling. She is currently an Senior Rock Physicist at Schlumberger.

Prior to this she was a Senior Rock Physicist and Product Owner for Rock Solid Images where she developed novel rock models and workflows for multiphysics reservoir interpretation. She was also involved in implementing those models and workflows in RSI’s rock physics modelling software package (iMOSS). 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 from the University of Southampton investigating the elastic and electrical properties of gas hydrate saturated sediments.