1 / 23

Dr. Tark Hamilton Camosun College

Sedimentary Geology Geos 240 – Chapter 2 Collecting the Data Part 1 Geological, Stratigraphic & Petrophysical Data. Dr. Tark Hamilton Camosun College. Collecting the Data. Stratigraphic Sections from Surface Outcrops Petrophysical logging of boreholes Well cuttings and cores

thuong
Télécharger la présentation

Dr. Tark Hamilton Camosun College

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Sedimentary GeologyGeos 240 – Chapter 2Collecting the DataPart 1 Geological, Stratigraphic & Petrophysical Data Dr. Tark Hamilton Camosun College

  2. Collecting the Data • Stratigraphic Sections from Surface Outcrops • Petrophysical logging of boreholes • Well cuttings and cores • Regional Geophysics • Labwork on sediments, rocks, fossils, fluids • Computer/Office: Mapping, Interpretation & Modelling

  3. Measuring a Stratigraphic Section Gayna River near Norman Wells NWT Western Canada Sedimentary Basin

  4. Measuring with a Jacob’s Staff • Use a 1.5 m stick with a level or dip arrow • Site along to next 1.5 m position in true thickness position and add! • One potato two potato three potato four!, Five potato Six potato…

  5. Strip Log – Stratigraphic Section • Grain Size increases to right = resistance to weathering • Sands>> stick out while Shales<< are recessive

  6. Castlegate Sandstone: Utah • Horizontal Photos & Line Drawing showing bedding, sequence boundaries & paleocurrent directions • ~1 week’s work

  7. Components of a Modern Exploration Rig on Land

  8. Drilling Details:Mud Lubricates, Cools, Prevents Blowouts, Carries Cuttings & Fluids

  9. Roller Bits For Various Hole Sizes • For Hard Rocks (Sandstones & Limestones) • Blade Bits are used for clays, coals and soft shales

  10. Core, Core Boxes & Cuttings • Description is the major work of most wellsite geologists • Core “libraries” at ISPG Calgary & Charlie Lake, NEBC

  11. Coring Tools: Full Core & Sidewall

  12. Energy Resources Conservation Board: ISPG & University of Calgary

  13. Detailed Well Log • Formation Symbols at Left, SP & Gamma Logs • Lithologic interpretation, Detailed descriptions

  14. Table of Petrophysical Logs Fluids vs Rock Brine, Gas, Oil Logs vary w/Diam Low Dens Coal Salts FMS TV Pictures Sedimentary structures XRF Induced Gamma Ray Fluorescence Chemistry/Mineralogy

  15. Physical Properties of Formation near a Borehole • Drilling Fluids: mud, salts, ions, water move

  16. Natural Gamma Measures Shaliness due to 40K in clay minerals Nunavut

  17. Common Petrophysical Logs: SP • Shales have + SP response, high CEC, Na+ moves into mud • Permeable Sands have –SP response. Cl- is more mobile as mineral surfaces are negatively charged (silicates)

  18. Petrophysical Logging: SP & Resistivity • SP –Sand line to left, +Shale Line to right • Resistivity tool has different depths of penetration

  19. Petrophysical Logs: Caliper & Resistivity • Shales are soft so hole cuts to a bigger diameter Mudcake Fresh Water Invasion Mudcake

  20. Petrophysical Logs: Neutron & Density

  21. Petrophysical logs: Dipmeter & FMS

  22. Channel Sands in Shales Sands L.Cretaceous Jurassic

  23. THIS COVERS MOST CONVENTIONAL SEDIMENTARY GEOLOGY FOR RESOURCE EXPLORATIONEnd of Chapter 2 Part 1 (Strata, Sedimentary Rocks & Well Logs) • Mining Exploration, Environmental, Geotechnical, Aquifer, Academic & Archeological studies all do similar things but with smaller tools, areas of interest and way smaller budgets!

More Related