Algeria Upstream

1
WOC 1 Exploration Production of Natural Gas
SG 1.2. Difficult reservoirs and unconventional
natural gas resources
Kamel Eddine CHIKHI Associations
Director SONATRACH
Moscow Meeting 25-27 September 2006
2
Study Group Topics

• Difficult reservoirs and unconventional resources
• 1. Difficult reservoirs and technologies for
  their exploration and production (sour gas,
  HT/HP, Deep Gas (gt4,500m, basin center), shallow
  (lt500 m) gas, tight reservoirs)
• 2. Unconventional resources and technologies for
  their exploration and production (coalbed
  methane, gas hydrates, aquifer gas).

3
Unconventional Reservoirs A permanent Challenge
4
Difficult reservoirs Areas of Concern

• Study Goals
• Definitions
• Definition of difficult reservoirs
• Sedimentology Petrology Depositional
  environments reconstitution
• Subsidence its consequences
• Diagenesis diagenetic sequences
• Natural fracturation origin effects on
  reservoirs qualities
• Porosity characterization classification
• Geomechanics fundamentals
• Reservoirs Stimulation
• Exploration technologies
• Anisotropy assessment spacial development
  geometry and distribution of ? and k
• Natural fractures characterization modeling
• Microfacies standardisation
• Seismic attributes as a tool to characterize and
  predict reservoirs properties
• Formation evaluation dedicated techniques
• Flow units characterisation Multilayers
  modelling
• Resources reserves assessment - Uncertainties
  quantification
• Drilling fluids design wellbore stability

5
Difficult reservoirs

• Expected results
• Identification of key technology needs for
  understanding Difficult Reservoirs
• Address areas of technology improvements needed
  to face technical gaps in exploration
  production
• Lower cost of difficult reservoirs development in
  particular for Play Resources assessment,
  Subsurface Imaging, Drilling, Well Completion,
  and Stimulation.

6
Unconventional Natural Gas Resources

• Study Goals
• Definitions Standardization attempt
• Definition of unconventional gas resources
• Standardization of the different categories
• Deep basin centered natural gas, Tight natural
  gas sands, Shale gas,
• Coalbed methane, Geopressurized zones,
  Methane hydrates
• Assessment Outlook
• Exploration efficiency
• Assessment of unconventional Gas Reserves
  Resources
• Technically Economically recoverable UNGR
• Role of unconventional gas in world supply for
  mid long terms
• Exploration Production technologies
• Data (seismic wells) integrated expert systems
  
• Basin scale petroleum systems
• Sourcing modeling
• Fracturation assessment modeling
• Plays / Reservoirs characterization modeling
• Well-log interpretation/petrophysical models for
  detection of marginal pay
• Dedicated drilling techniques

7
Unconventional Natural Gas Resources

• Expected results
• Review of Definition of what is exactly
  unconventional gas propose a classification
  that, if accepted, can be used in different world
  regions
• Update of the Global trends the role of
  unconventional Gas Reserves Resources in world
  supply
• Fine tuning Exploration techniques
  democratization of dedicated technologies for
  assessing UNGR
• Deliver a comprehensive overview of production
  techniques and best practices overview

8
Study Group 1.2

• Meetings
• 3 meetings / year February, June, October
• Identify locations for forthcoming meetings
  Proposals
• Themes
• Questionnaire concerning items to be studied
• Finalize, prior to next meeting, the list of
  themes
• Contribution
• Build a data base of external experts to be
  invited to contribute to the study
• Finalize list of members of the group
• Technical Secretary of SG 1.2

9
Unconventional Reservoirs