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ASSESSING SHALE GAS RESOURCE PLAYS

ASSESSING SHALE GAS RESOURCE PLAYS. Energy Experts Believe. Oil is Finite. Demand is not. E&P Business:. Oil Price, Margin, Size & Value. Low Oil Price. High Margin Asset. =. high tide. high operating costs. *Low Margin Asset. =. low tide. High Oil Price. low operating costs.

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ASSESSING SHALE GAS RESOURCE PLAYS

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  1. ASSESSING SHALE GAS RESOURCE PLAYS

  2. Energy Experts Believe • Oil is Finite • Demand is not

  3. E&P Business: Oil Price, Margin, Size & Value Low Oil Price High Margin Asset = high tide high operating costs *Low Margin Asset = low tide High Oil Price low operating costs

  4. Despite Early Stages of Exploration Huge Amounts of Shale Gas is estimated in different parts of world Global Shale Gas Volumes GIP TCF Source: Rogner 1997 • Over 32,500 TCF of gas identified worldwide from Unconventional Reservoirs

  5. Ravi Misra

  6. Shale Gas Tight Gas Basin Centered gas

  7. Attractive, Hottest Business OpportunityAcross Globe Shale Gas is key to USA Energy Basket • US 2008 ytd. production of Shale Gas is 3.23 TCF • 17% of total US gas production from Shale Gas • India’s total annual Conventional Gas production is only 26% of US Shale Gas production (Schlumberger)

  8. Shale Gas

  9. What is shale Gas? Continuous type regionally pervasive self contained natural gas plays in Shale/Shaly Formations • Shale gas is natural gas contained within shale sequences. The gas is stored in shale in two major ways: • As adsorbed gas on kerogen (insoluble organic matter). In this respect, it is similar to natural gas from coals. • The adsorbed gas portion range between 20% (Barnett Shale) and 85% (Lewis Shale). UTICA SHALES, NEW YORK

  10. Play Type Identification is Critical For Assessment and Exploration Thermogenic Biogenic Mix Type

  11. …..Contd. • Gas Shales contain significant portions of both adsorbed gas and interstitial pore gas

  12. NO TWO SHALES ARE ALIKE But look for right combination of shale characteristics SHALE TYPING IS ESSENTIAL

  13. PLAY CHARACTERISTICS • Continuous type plays • Cover large arial extent • Large net thickness (on average) • Traits which differ from coals

  14. *Gas Saturations Adsorbed and Free Gas* PRINCIPAL TYPES OF GAS STORAGE PHENOMENA

  15. Dual Permeability System • Natural Fracture Systems often Control the Success or Failure of Stimulation Attempts • Natural Fracture Geometry can Change Laterally and Vertically with Lithology related Mechanical Properties and Stress Changes

  16. The Flow Path

  17. SHALE PLAY EVALUATION

  18. The Fundamental Aspects for Evaluation • Generation Potential (source) • Storage Potential (reservoir) • Production Potential (Productivity)

  19. EVALUATION CRITERIA • GEOSCIENTIFIC Geological Geochemical Petrophysical Reservoir • TECHNOLOGICAL • Gas assessment related • Drilling and completion related • Stimulation and production related • COMMERCIAL & ECONOMIC

  20. Geological Parameters • Shale Thickness (>100M) • Shale Depth (<2500M) • Areal extent • Shale Type (silty) • Shale brittleness (low Poissons ratio & high Youngs Modulus)

  21. GEOCHEMICAL EVALUATION

  22. What makes the shale a good SOURCE for gas plays TR TOC Vro Thickness Kerogen type HI/O2 Biogenic-Thermogenic ratio

  23. Multiple Methane Adsorption Isotherms, Antrim Shale Well

  24. Organic Matter Type Effect • Sapropelic Kerogens generate twice the volume of gas as do Humic Kerogens but oil interfere with release of gas until >1.0Vro • Humic Kerogens (III) generates mainly gas starting at 0.5 Vro • Type I Kerogen starts gas generation at higher maturity than type II and Type III Kerogens

  25. Iso Tmax plot

  26. Iso Maturity Map

  27. Martini 2003

  28. Shale Gas Composition

  29. Petrophysical

  30. Log Motifs of producing Marcellus gas shales

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