WELLOG

WELLOG ELECTRIC LOGS

Revised 5-22-2008

ELECTRIC LOGS:

Electric logs are a select group of logs that use the flow of electric current in the formations surrounding a well for measurement. The names of the logs that fall within this group and their hydrologic applicability are as follows:

NAME: Lithology Bed Formation Invaded Flushed Mud (1) Formation

Correlation Thickness Resistivity Resistivity Resistivity Resistivity water Resistivity

1. Single Point Resistance (SPR) X X

2. Short Normal X X X

3. Long Normal X X

4. Lateral Device X X

5. Wall Resistivity X X X

5. Focused resistivity (Guard) X X X X

6. Micro focused X X

7. Induction X X X X

8. Spontaneous Potential (SP) X X

Note: (1) Use mud kit for mud pit samples

Links to pages that give expanded information on these logs are provided above.