Sedimentary Sedimentary GeologyGeology

Geos 240 – Chapter Geos 240 – Chapter 1010

Sequence Sequence StratigraphyStratigraphy

Dr. Tark HamiltonDr. Tark Hamilton Readings from Sediments & Basins: (10:1-22)Readings from Sediments & Basins: (10:1-22)

Camosun CollegeCamosun College

Depth to Basement:Depth to Basement:Structure Contour MapStructure Contour Map

How does this differ from a total sediment isopach map?

What is thismap missing?

Innuitian Orogen

App

alac

hian

Oro

gen

Cordilleran O

rogen

Structure Structure Contour Map of Contour Map of Messla Oil Field Messla Oil Field

Libya after Libya after Clifford (1980)Clifford (1980)

Sand BodyGeometry:

“Tops”

Deep

Shallow

Ghignone (1970)Ghignone (1970)

Effect of NormalFaults on Sands

Off Brazil’sPassive Margin:Tilts Down to W

Barremian-Albian IsopachBeaufort Mackenzie Basin

Note: Uplifts & Troughs

Upper Upper Cretaceous Cretaceous

Isopach Map: Isopach Map: A Delta in theA Delta in the Cannonball Cannonball

SeaSea

Pc BeartoothPlateau!

River Dominated Delta: U. River Dominated Delta: U. Cret. ABCret. AB

Can you find the 2shoestring sand bodies?

Total Sand Isopach

Sand IsolithSand IsolithPoint Bar FieldPoint Bar Field

Berg (1968)Berg (1968)

Sand IsolithSand IsolithMultiple LevelMultiple Level

ReservoirReservoirEaves (1976)Eaves (1976)

(Dots = Wells!)(Dots = Wells!)

Sand Sand IsolithIsolithFluvialFluvial

ChannelChannel

Gamma Gamma logs forlogs forControlControlCret. TXCret. TX

Aptian Grain Size:Beaufort-Mackenzie Basin

LithofaciesLithofaciesBathonianBathonian

Middle JurassicMiddle JurassicPersian GulfPersian Gulf

Reefs

Lithofacies Lithofacies Map: Albian Map: Albian

– – CenomanianCenomanianSE. MexicoSE. Mexico(Yucatan)(Yucatan)

Moran-Moran-Zanteno Zanteno (1994)(1994)

Oops! Who Left these Anhydrite Beds under the

Proposed Cixulub Impact Site?

Log FaciesLog Facies

Lower Lower Cretaceous Cretaceous SandstonesSandstones

Cannonball SeaCannonball SeaAlbertaAlberta

(Gas Sands)(Gas Sands)

Gamma Log Gamma Log FaciesFacies

NarrabeenNarrabeenPermian Fluvial Permian Fluvial

SandsSands

Sydney Basin,Sydney Basin,AustraliaAustralia

LithofaciesLithofacies

NarrabeenNarrabeenPermian Permian

Fluvial SandsFluvial Sands

Sydney Basin,Sydney Basin,AustraliaAustralia

Source

Source

Sadlerochit: Prudhoe Bay FieldSadlerochit: Prudhoe Bay FieldNorth Slope, AlaskaNorth Slope, Alaska

The End!The End!