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Logging Carbonates

Logging Carbonates. Field Trip 2 Preparation. Logging Carbonates. Depth/Scale/Contacts Texture (Dunham) Mineral Composition Allochem Composition Bioturbation Color Fossils Sedimentary Structures / Textures Porosity Comments.

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Logging Carbonates

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  1. Logging Carbonates Field Trip 2 Preparation

  2. Logging Carbonates • Depth/Scale/Contacts • Texture (Dunham) • Mineral Composition • Allochem Composition • Bioturbation • Color • Fossils • Sedimentary Structures / Textures • Porosity • Comments Text: Boggs p. 170-186; Manual p. 90-94

  3. Grn l Pk l Wke l Mudst

  4. Depth/Scale/Contacts • Calculate total depth and appropriate scale / units • Mark major contacts (color, grains size, lithology, etc.) • Determine nature of contacts (sharp, gradational, erosional) S Sharp G Gradational SI Sharp irregular B Gradational-interbedded SC Sharp conformable VS Visibly scoured SD Sharp disconformable BU Burrowed ST Stylolite

  5. Texture • Determine Dunham texture between major contacts. • Plot texture / weathering profile. Grainstone : Packstone : Wackestone : Mudstone

  6. Texture http://www.glossary.oilfield.slb.com/DisplayImage.cfm?ID=24

  7. Texture http://www.eos.ubc.ca/courses/eosc221/sed/carb/classification.html

  8. Logging Carbonates • Depth/Scale/Contacts • Texture (Dunham) • Mineral Composition • Allochem Composition • Bioturbation • Color • Fossils • Sedimentary Structures / Textures • Porosity • Comments Text: Boggs p. 170-186; Manual p. 90-94

  9. Mineral Composition (Manual p. 92)

  10. Allochem Composition (Manual p. 93)

  11. Allochem Composition (M. Campbell)

  12. Allochem Composition (M. Campbell)

  13. (416M)

  14. Logging Carbonates • Depth/Scale/Contacts • Texture (Dunham) • Mineral Composition • Allochem Composition • Bioturbation • Color • Fossils • Sedimentary Structures / Textures • Porosity • Comments Text: Boggs p. 170-186; Manual p. 90-94

  15. Bioturbation • Determine extent of bioturbation

  16. Color • Indicate color with letter symbols. L - Light G - Gray C - Cream M - Medium B - Brown W - White D - Dark R - Red Bk - Black m - Mottled O - Orange Cl - Clear Y - Yellow Gn - Green Bl – Blue Example: LBG = light brownish gray

  17. Logging Carbonates • Depth/Scale/Contacts • Texture (Dunham) • Mineral Composition • Allochem Composition • Bioturbation • Color • Fossils • Sedimentary Structures / Textures • Porosity • Comments Text: Boggs p. 170-186; Manual p. 90-94

  18. (416M)

  19. Sedimentary Structures / Textures (Manual, p. 94)

  20. Logging Carbonates • Depth/Scale/Contacts • Texture (Dunham) • Mineral Composition • Allochem Composition • Bioturbation • Color • Fossils • Sedimentary Structures / Textures • Porosity • Comments Text: Boggs p. 170-186; Manual p. 90-94

  21. Porosity (Manual, p. 91)

  22. Comments • Include comments of features not depicted graphically • - paleosols • - ghost grains • - unusual minerals • - cements (spar) • - porosity (percentage estimates)

  23. Logging Carbonates Field Trip 2 Preparation

  24. Field Trip #2: Paleozoic Rocks • Location • Geology • Assignment / Methods • Reminders Text: Manual p. 39-41; 57-65; 267-278; Compton 180-182.

  25. Location Stop 1: Honeycut Bend, Archer Ranch near Johnson City Stop 2: Crabapple Creek near Fredericksburg Stop 3: Hoover Point near Kingsland

  26. LLano 10 miles N Kingsland 3 Marble Falls 2 Johnson City 1 Fredericksburg

  27. Geology Paleozoic Sedimentary Rocks Ordovician - Pennsylvanian Carbonates Cambrian Wilberns Formation Morgan Creek Limestone member Welge Sandstone Member Riley Formation Cap Mountain Limestone member Lion Mountain Sandstone member Hickory Sandstone member Bastrop N 5 miles

  28. (Manual, p. 272)

  29. Geology Inversion of Topography

  30. Field Trip #2: Paleozoic Rocks • Location • Geology • Assignment / Methods • Reminders Text: Manual p. 39-41; 57-65; 267-278; Compton 180-182.

  31. Assignment / Methods Assignment #1 Measure and describe Paleozoic carbonates at Honeycut Bend. • Subdivide into lithostratigraphic units. • Measure and Describe each unit. !!! Work Oldest  Youngest

  32. Honeycut Bend

  33. Honeycut Bend

  34. Honeycut Bend

  35. Grn l Pk l Wke l Mudst

  36. Assignment / Methods Assignment #2 Measure & plot azimuths of paleocurrent features at Crabapple Creek. • 30 crossbed sets • 10 current ripple marks • Determine shoreline and seaward directions.

  37. Crabapple Creek

  38. Assignment / Methods

  39. Crabapple Creek

  40. Assignment / Methods Plot azimuths and determine vector mean. Practice: Manual p. 39-41

  41. Assignment / Methods Assignment #3 Inventory features in Cambrian sediments at Hoover Point

  42. Hoover Point Insert inventory list here (Luis Garcia)

  43. Assignment / Methods

  44. Field Trip #2: Paleozoic Rocks • Location • Geology • Assignment / Methods • Reminders Text: Manual p. 39-41; 57-65; 267-278; Compton 180-182.

  45. Reminders • Brunton • Rock Hammer • HCl acid (provided) • Hand Lens • Field Notebook • Raincoat • Jeans • Lab Manual • Water • Lunch • Clipboard • Pencil and Colored Pencils • Ruler & Protractor • Paper

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