Quantity

TOC

S₁

S₂

mgHC/g rock

mgHC/g rock

Poor

<0.5

<0.5

<2.5

Fair

0.5 - 1

0.5 - 1

2.5 - 5.0

Good

1 - 2

1 - 2

5 - 10

Very Good

2 - 4

2 - 4

10 - 20

Excellent

>4

>4

>20

Quality

HI

S₂/S₃

Kerogen Type

mgHC/g TOC

mgHC/g rock

-

<50

<1

IV

Gas

20 - 200

1 - 5

III

Oil and Gas

200 - 300

5 - 10

II/III

Oil

300 - 600

10 - 15

II

Oil

>600

>15

I

Thermal Maturity

VR (%)

Tmax (˚C)

TAI

Immature

0.2 - 0.6

<435

1.5 - 2.6

Mature

Early

0.6 - 0.65

435 - 445

2.6 - 2.7

Peak

0.65 - 0.9

445 - 450

2.7 - 2.9

Late

0.9 - 1.35

450 - 470

2.9 - 3.3

Over mature

>1.35

>470

>3.3