PETROLEUM
SYSTEM

Overview

is the combination of main geological attributes that lead to the accumulation of HC

petroleum originate -> place of accumulation ->
how it migrate -> source -> trap

Source rock

fine-grained sediment in its natural setting
(release enough HC for oil and gas)

type of rock with OM capable to generate HC

Properties

Total Organic content
-weight % organic C
->1% (source rock)
->15% (world class source rock)

Hydrogen Index
-total H relative to H in water

Components &
Processes

Type of source rock

Fundamental component
grain - porosity - cement - matrix

Process

Trap Formation

Hydrocarbon

generation, migration, accumulation

Petroleum System

generation -> migration -> entrapment
-> retention -> recovery

is a maturation process

fossil organic matter -> oil and gas

Elements

Processes

Sedimentary
-most frequent (shale, sandstone, carbonate)

Generation

Expulsion
-oil & gas from source
rock at oil window &
gas window

Migration
-complete system
-incomplete system

Accumulation

Preservation

Rock Type

-rock that produce HC when buried and heated
-may contain recoverable HC resources
-that prevent HC passing through

Sedimentary Basin

a large subsiding depression filled with thick sequence of sedimentary rock