Pressures and Overpressure in the Subsurface - 3 Days Course

September 13 - 15, 2022
3 day in_person course: GSL Logo The main objective of this 3 Day course is for attendees to learn how pressure data affects the safe and optimal exploration and exploitation of hydrocarbon reservoirs. Overpressure is found in most sedimentary basins, where reservoirs tend to be fine-grained lithologies, especially at depths >2.0km below sea-bed.
Course Location
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DAY 1 Introduction
  • The importance of pressure data
  • Understanding the system
  • Worldwide application
  • Viewing pressure data
Fundamentals of Pressure
  • Definitions & Units
  • Hydrostatic pressures & gradients Lithostatic pressures & gradients Fracture pressure & gradients Sources & types of pressure data Subsurface pressure analysis Fluid pressure gradients & fluid contact
DAY 2 Mechanisms for Generating Overpressure
  • Disequilibrium compaction
  • Terzaghi’s Equation and a “shared overburden”
Pore Pressure Prediction
  • Pressure prediction workflow
  • Normal compaction trend analysis
  • Terzaghi’s principle
  • Eaton’s Ratio method
  • Equivalent Depth method
  • Bowers method
  • Seismic velocity based pressure prediction (an outline)
  • Basin modelling (an outline)
Reservoir vs. Shale Pressure
  • Lateral Drainage
  • Lateral Transfer
Secondary Mechanisms
  • Fluid volume increase
  • Load transfer
  • Recognising secondary mechanisms
DAY 3 The Use of Drilling Data
  • Why use drilling data?
  • What to look for
Well Planning
  • What is a well plan?
  • Why do we need a well plan?
  • Elements of a well plan
  • Low, Expected & High cases
  • Pre-drill vs.Real-Time
Overpressure & the Hydrocarbon System
  • Seal breach mechanisms
  • Seal capacity, seal breach & column height
  • Protected traps
  • Reservoir quality
  • Migration
  • Hydrocarbon maturation
Mapping Overpressure
  • Compartmentalization
  • Vertical & lateral seals
Hydrodynamics
  • Variable hydrocarbon-water contacts
  • Tilted contacts
  • Gravity vs. drainage-driven hydrodynamics
  • Effect on reserves
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