Sediment Compaction and Applications in Petroleum Geoscience

1. Front Matter

   Pages i-xxiii

   PDF

2. Compaction of Sediments and Different Compaction Models

   • Troyee Dasgupta, Soumyajit Mukherjee

   Pages 1-8

3. Porosity in Carbonates

   • Troyee Dasgupta, Soumyajit Mukherjee

   Pages 9-18

4. Pore Pressure Determination Methods

   • Troyee Dasgupta, Soumyajit Mukherjee

   Pages 19-30

5. Detection of Abnormal Pressures from Well Logs

   • Troyee Dasgupta, Soumyajit Mukherjee

   Pages 31-49

6. Global Overpressure Scenario

   • Troyee Dasgupta, Soumyajit Mukherjee

   Pages 51-81

7. Investigation of Erosion Using Compaction Trend Analysis on Sonic Data

   • Troyee Dasgupta, Soumyajit Mukherjee

   Pages 83-90

8. Pore Pressure in Different Settings

   • Troyee Dasgupta, Soumyajit Mukherjee

   Pages 91-99

9. Correction to: Detection of Abnormal Pressures from Well Logs

   • Troyee Dasgupta, Soumyajit Mukherjee

   Pages C1-C1

This book discusses how sediments compact with depth and applications of the compaction trends. Porosity reduction in sediment conveniently indicates the degree of sediments compacted after deposition. Published empirical curves- the compaction curves- are depth-wise porosity variation through which change in pore spaces from sediment surface to deeper depths e.g. up to 6 km can be delineated. Porosity is derived from well logs. Compaction curves, referred to as the Normal Porosity Profile of shales, sandstones and shale bearing sandstones of different models are reviewed along with the different mechanical and chemical compaction processes. These compaction models reveals how porosity reduces depth-wise and the probable reason for anomalous zones. Deviation from these normal compaction trends may indicate abnormal pressure scenarios: either over- or under pressure. We highlight global examples of abnormal pressure scenarios along with the different primary- and secondary mechanisms. Well logs and cores being the direct measurements of porosity, well log is the only cost-effective way to determine porosity of subsurface rocks. Certain well logs can detect overpressure and the preference of one log above the other helps reduce the uncertainty. Apart from delineation of under-compacted zones by comparing the modeled- with the actual compaction, porosity data can also estimate erosion.

• Normal Compaction Trend
• Athy's equation
• Compaction disequilibrium
• Sediment erosion
• Sediment exhumation
• Well logs
• Seismic data
• structural geology
• quantitative geology

• Department of Earth Sciences, Indian Institute of Technology Bombay, Mumbai, India

  Troyee Dasgupta, Soumyajit Mukherjee

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