Well Log Interpretation

Overview

Well logs are the most continuous record we have of the rocks and fluids a well has penetrated, and almost every subsurface decision draws on them. This course teaches participants to read and interpret openhole logs quantitatively. It begins with the borehole environment and the physics of the main logging tools, including gamma ray, spontaneous potential, resistivity, density, neutron and sonic measurements. Participants then learn to identify lithology, pick reservoir zones, estimate shale volume, porosity and water saturation, and recognise hydrocarbon types. The programme also introduces shaly sand analysis, carbonate challenges, formation pressure and sampling tools, image logs and NMR, and shows how log results feed into net pay, volumetrics and completion decisions. Quality control and the integration of logs with core and test data are emphasised throughout.

Objectives

• Explain the borehole environment and its effect on log measurements
• Describe the physics and applications of the main openhole logging tools
• Identify lithology and reservoir intervals from log responses
• Calculate shale volume, porosity and water saturation
• Distinguish oil, gas and water zones
• Apply quality control checks to log data
• Integrate log results with core, pressure and test data

Who should attend

Training methodology

Participants work through log suites from clastic and carbonate reservoirs, starting with quick-look interpretation by hand and progressing to spreadsheet-based quantitative evaluation. Each tool is introduced with its measurement principle, typical responses and common pitfalls, then applied immediately to real data. Group exercises compare interpretations and discuss uncertainty. The course ends with a complete well evaluation exercise in which teams estimate net pay and hydrocarbons in place, followed by an individual assessment.

Programme outline

Dates and fees

Fees are in GBP. per delegate.

Certificate

Frequently asked questions