Objectives

  The course aims to provide in-depth geologic and engineering basic concepts used to characterize, evaluate, and manage naturally-fractured reservoirs. The main objective is to contribute high-level job assignments in petroleum production from fractured reservoir as well as the understanding of oil/gas production from dual porosity systems.

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Content  

  Course outline (12 hours/2 days)

Stress and Strain

Stress definition

Kinds of stress

Kinds of strain

Measurement of stiffness

Measurement of strength

Fractures and discontinuities

Non homogeneity and anisotropy of rocks

Discontinuities and fluid movement

Natural fractures

Origin of natural fractures

Fracture mode

Classification of natural fractures

Fracture types and sub-types

Mechanical aspects

Fracture morphology and deformation structures

Fractured reservoirs

Definition

Fluid flow

Permeability and factors controlling permeability

Porosity and factors controlling permeability

Porosity and porosity types

Anisotropy

Fractured reservoir evaluation

Avoid fracture denial: problems

Definition of a reservoir fracture vs fractured reservoir

Basic types of evaluation

General sequences of study

Fracture properties affecting reservoir performance

Fracture and matrix porosity communication

Basics of fracture and matrix porosity

Porosity-Permeability relationship

Compressibility and magnitude differences

Fracture porosity estimation

Reservoir management

Classification of fractured reservoirs

Aguilera and Nelson classification

Schematic distribution of fractured reservoir types

Attributes of fractured reservoir types

Detecting fractured reservoirs

Predicting fractured reservoir spacing and intensity

Identifying and developing fractured reservoirs

Review questions

Case Study: THE LANKASTER RESERVOIR – SCOTLAND