Book contents
- A Concise Guide to Geopressure
- A Concise Guide to Geopressure
- Copyright page
- Contents
- Acknowledgments
- Nomenclature
- 1 Introduction
- 2 Reservoir Pore Pressure
- 3 Mudrock Material Behavior
- 4 The Origins of Geopressure
- 5 Pore Pressure Prediction in Mudrocks
- 6 Pore Pressure Prediction: Unloading, Diagenesis, and Non-Uniaxial Strain
- 7 Pressure and Stress from Seismic Velocity
- 8 Overburden Stress, Least Principal Stress, and Fracture Initiation Pressure
- 9 Trap Integrity
- 10 Flow Focusing and Centroid Prediction
- 11 Flow Focusing, Fluid Expulsion, and the Protected Trap
- References
- Index
8 - Overburden Stress, Least Principal Stress, and Fracture Initiation Pressure
Published online by Cambridge University Press: 04 March 2021
Book contents
- A Concise Guide to Geopressure
- A Concise Guide to Geopressure
- Copyright page
- Contents
- Acknowledgments
- Nomenclature
- 1 Introduction
- 2 Reservoir Pore Pressure
- 3 Mudrock Material Behavior
- 4 The Origins of Geopressure
- 5 Pore Pressure Prediction in Mudrocks
- 6 Pore Pressure Prediction: Unloading, Diagenesis, and Non-Uniaxial Strain
- 7 Pressure and Stress from Seismic Velocity
- 8 Overburden Stress, Least Principal Stress, and Fracture Initiation Pressure
- 9 Trap Integrity
- 10 Flow Focusing and Centroid Prediction
- 11 Flow Focusing, Fluid Expulsion, and the Protected Trap
- References
- Index
Summary
Total stresses are an important control on pore pressure and fluid flow in sedimentary basins. The magnitude of the total stresses must be known in order to estimate the pore pressure. When pore pressure exceeds the least principal stress, hydraulic fracturing can occur and, if so, fluids are rapidly drained. This can occur naturally or during drilling. I first describe how to estimate the overburden stress, which is commonly assumed to equal the vertical stress and the fracture initiation pressure in a borehole. Zoback (2007) provides an extensive overview of these issues.
- Type
- Chapter
- Information
- A Concise Guide to GeopressureOrigin, Prediction, and Applications, pp. 167 - 193Publisher: Cambridge University PressPrint publication year: 2021