Empirical Factors Leading to a Good Fractured Reservoir

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Empirical Factors Leading to a Good Fractured
Reservoir

• Early recognition of fractures
• High fracture intensity good connections
• Good interaction between fracture matrix
• High reservoir energy
• Low water influx
• If deep or fine grained, partial mineralization
  along fractures

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Exploration Development Drilling Score Card

• Picking optimum well locations - Good
• Picking optimum drilling directions - Great
• Assigning reservoir properties
• Rates - Good
• Volumes - Poor
• Cross flow - Poor

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E D Drilling Score Card(cont.)

• Determining drainage area - Fair
• Predicting well reservoir response
• Recovery - Poor
• Longevity - Poor
• Well history - Fair
• Assigning risk economic success rate - Poor to
  Fair

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Modern Approaches are Based On

• New quantitative techniques in fracture
  characterization
• Multidisciplinary integrated analyses
• More available reservoir simulation
• Better use of directional horizontal drilling
  techniques
• More in-depth use of Risk Analysis

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General Outline

1. Introduction
2. Fracture Origin
3. Fracture Morphology
4. Fracture Porosity
5. Fracture Permeability
6. F/M Interaction
7. Fracture Intensity
8. Intensity Prediction

• 9. Orientations
• 10. Reservoir Types
• 11. Well Directions
• 12. Simulation
• 13. Fracture Reservoir Production
• 14. Reservoir Screening
• 15. Summary
• (Field Examples)

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Summary

• 6 phase approach to study of fractured
  reservoirs.
• Build from rock data first.
• Geophysical and rock mech. data can be used to
  highlight sweet spots.
• Reservoir prop. in fractures are different than
  matrix.
• Res. Mgmt. Strategies are very important.

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Summary (cont.)

• Future advances will include upscaling fracture
  descriptions for reservoir simulation and
  defining connectedness in natural fracture
  systems.
• Because we can better quantify fractured
  reservoirs and predict their properties we should
  no longer fear or avoid them.

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