Training

This course is focused on the analysis of depositional textures and their subsequent diagenetic modifications as the main control on the pore system heterogeneity and complexity.  The intricate inter-relationship of the depositional and burial history can be unravelled to allow prediction of reservoir facies and reconstruction of three-dimensional reservoir models. Carbonate rock typing provides a tool for propagating reservoir properties in the static/geological models based on an exhaustive calibration of conventional and computed logs with rock data at core, plug, thin-section and pore scales. The course demonstrates the value of understanding pore system evolution as a part of large-scale volumetric assessments and development of carbonate reservoirs.

The workshop is organised into three sessions:

Part A: Reservoir quality analysis - what it is and how to approach it
• Definition of reservoir quality
• Introduction to carbonate rock pore systems: a heterogeneous and complex world
• Commonly used analytical techniques to measure pore volume and connectivity

Part B: Controls on reservoir quality - from deposition to diagenesis
• Depositional controls
- Texture: allochems vs matrix
- Skeletal and non-skeletal allochems: how they affect pore volume and distribution
- Micritic matrix: a small world with a big impact
- Bioturbation
- Clay content
• Diagenetic controls
- Dissolution: early vs late
- Cementation: pore-lining vs pore-filling
- Dolomitisation: replacive vs cementing
- Compaction
• Tectonic controls
- Fracturing

Part C: Rock types and their importance on the large-scale modelling
• How to display porosity/permeability data
• How to define rock types
• Importance of rock typing in reservoir modelling

Note: each section will be accompanied by examples from case studies.