24-Pet-A1 Principles of Stratigraphy and Sedimentation · Undated paper
Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)
EGBC National Exam — Petroleum Engineering, 17-Pet-A1 Principles of Stratigraphy & Sedimentation, 2019-May. 3 hours duration; closed book, approved Sharp/Casio calculator permitted. The paper has two parts: Part A (Questions 1–10, Sedimentology and Sedimentary Processes) – Questions 1 and 2 are mandatory (10 marks each, 20 marks), plus any five of the remaining eight (3–10) at 6 marks each (30 marks), for a Part A total of 50 marks; and Part B (Questions 11–19, Stratigraphy and Sedimentary Basin Analysis) – answer any six of the nine at 6 marks each, for a Part B total of 36 marks – an 86-mark maximum (50 for Part A + 36 for Part B).
Reference texts: Boggs, S. Jr., Principles of Sedimentology and Stratigraphy, 5th ed., Pearson (grain texture, sediment transport, bedforms, carbonate/evaporite systems, sequence stratigraphy, unconformities, stratigraphic principles); Tucker, M.E., Sedimentary Petrology, 3rd ed., Blackwell (sandstone/carbonate classification, diagenesis, porosity); Nichols, G., Sedimentology and Stratigraphy, 2nd ed., Wiley-Blackwell (fluvial/deltaic/deep-marine systems, sequence stratigraphy, stratigraphic units); Reading, H.G. (ed.), Sedimentary Environments: Processes, Facies and Stratigraphy, 3rd ed., Blackwell (facies models, alluvial fans, deltas, deep-marine systems); Selley, R.C. & Sonnenberg, S., Elements of Petroleum Geology, 3rd ed., Academic Press (basin analysis, well-log correlation, seismic/acoustic impedance); International Commission on Stratigraphy, International Chronostratigraphic Chart (geological time scale).
Question text not reproduced: the examination questions are © Engineers and Geoscientists BC. Open the official past paper (linked at the top of this page) to read the question, then follow the worked solution below.
Sedimentary basin analysis – the integrated study of a basin's tectonic setting, subsidence/thermal history, stratigraphic fill, and depositional systems – underpins a wide range of practical applications:
| Application | How basin analysis contributes |
|---|---|
| Hydrocarbon & mineral exploration | Predicts source-rock, reservoir-facies and trap/seal distribution before drilling, reducing exploration risk |
| Petroleum systems modelling | Integrates burial and thermal (geothermal gradient/heat-flow) history to predict source-rock maturity (vitrinite reflectance) and the timing of hydrocarbon generation/expulsion relative to trap formation (the "critical moment") |
| Stratigraphic prediction & correlation | A sequence-stratigraphic framework built from basin analysis predicts facies distribution into unexplored parts of a basin |
| Structural/tectonic reconstruction | Basin geometry and subsidence pattern record the driving tectonic mechanism (rift, foreland, strike-slip, sag) and its evolution through time |
| Paleogeographic & paleoclimatic reconstruction | Basin fill records depositional environment, sediment provenance and paleocurrent direction, useful for reconstructing ancient geography and climate |
| Groundwater resource assessment | Aquifer geometry and connectivity are mapped from basin-fill architecture |
| Geohazard/CO2-storage assessment | Compaction/subsidence history and caprock integrity, increasingly relevant to carbon-capture-and-storage site selection |
| Coal and economic-sediment assessment | Burial/thermal history from basin analysis controls coal-seam distribution, quality and rank |
