Basic Well Logging – WLOG210B

Semester I, 2008

The Anatomy of a Well Log

Neal Alleyne

neal.alleyne@utt.edu.tt

Basic Well-Logging Interpretation

Sequence

Learning Outcomes

Recommended Reading

• Chapter 2, Wireline Log Measurements and Supportive Information, pp.43-57 “Introduction to Wireline Log Analysis”, Baker Hughes Inc. (2002).

• Chapter 4, “Measurement Environment –pp 60 – 91 in “Theory, Measurement, and Interpretation of Well Logs” by ZakiBassiouni, SPE Textbook Series Vol. 4 (1994).

Classification of Well Logging

Measurements

• Mud Logs

• Open Hole Logs1. Logging While Drilling (LWD)

2. Wireline Logging

• Cased Hole and Production Logs

Applications of Mud logs

• Monitoring of bit performance

• Determination of lithology

• Preliminary indication of well location relative to expected stratigraphy

• Indication of hydrocarbon type

• Indication of pressure conditions

Depth Accuracy ~+/- 5m

Wireline Tools

• Mandrel ToolsAlways centralized in borehole

• Pad ToolsRequired to make good contact with the borehole wall.Sensitive to borehole rugosity

A Pad Tool in the Open position