[Notes] Petroleum Geology Part 5

 Viscosity

- Internal friction of fluid

Color

- light (paraffinic oils)

- brown to black (asphalt base oil)

*Apologies again. My notes are terrible. Haha

Carbonate Reservoirs

*Limestone and dolomite

* 40% world oil reserves (as of 2017, but you can check)

*30% world gas reserves (as of 2017, but you can check)

(all other in sandstone reservoirs)

Carbonates

- shallow, tropical, marine waters

- saturated w/ CaCO3

- Factors controlling carbonate sedimentation

    *warmth

    *light

    *water movement

-begins as skeletal assemblage

Non-skeletal components of carbonate reservoir rocks

* lime muds

* coated grains

* fecal pellets

* lumps

* detrital grains

Carbonate Rock Classification

* Boundstone - components were bound together

* Grainstone - lacks mud; grain supported

* Packstone - grains supported

* Wackestone - more than 10% grains

* Mudstone - less than 10% grains

Carbonate depositional model

1. Carbonate shelf model - commonest, very shallow

2. Carbonate ramp model - no prominent break in slope; much less common

3. Carbonate shelf model - thru time