stratum

lithology

Resistivity (Ω·m)

Log resistivity

Lg (Ω·m)

remarks

Cenozoic

Quaternary

Q

Silt, clay, silt, fine sand

0 - 100

0 - 2.0

The average of resistivit-ies

Neogene

N

Mudstone, siltstone, onglomerate

9.1 - 13.9

0.96 - 1.14

Lower Paleozoic

Ordovician

O

Limestone

800 - 1500

2.9 - 3.2

Cambrian System

Limestone, Marl, shale

254 - 608

2.4 - 2.8

Upper Proterozoic

Qingbaikou

Qn

Sand shale intercalated with carbonate rock

136 - 248

2.13 - 2.40

Mesoproterozoic

Jixian

Jx

Sand shale intercalated with carbonate rock

540 - 1000

2.73 - 3

Changcheng

Ch

Dolomite, marl, shale

>600

>2.77

Archean

Ar

gneiss

>700

>2.84