Onboarding: Well Logs

John

John

Jul 07, 2023

Onboarding is Hard

When we start a new job, the scale of paperwork can shift. What if we're coming from a small operator to a large one, that tracks their wells much closer? It's hard to remember what can be tracked and why. EnerGPT to the rescue!

What are the different types of well logs and what information do they provide?

Response

The different types of well logs include:

1. Gamma Ray Log: Measures the natural gamma radiation emitted by the formation, which can help determine lithology, identify shale formations, and estimate porosity.

2. Resistivity Log: Measures the electrical resistivity of the formation, which can help determine the presence of hydrocarbons, identify permeable formations, and estimate water saturation.

3. Spontaneous Potential Log: Measures the voltage difference between the wellbore and the formation, which can help identify permeable formations and estimate water saturation.

4. Neutron Porosity Log: Measures the amount of hydrogen in the formation, which can help estimate porosity and identify lithology.

5. Density Log: Measures the bulk density of the formation, which can help estimate porosity and identify lithology.

6. Sonic Log: Measures the travel time of sound waves through the formation, which can help estimate porosity, identify lithology, and determine rock mechanics properties.

7. Caliper Log: Measures the diameter of the wellbore, which can help identify borehole stability issues and determine casing size.

8. Formation Pressure Measurement Log: Measures formation pressure, which can help estimate formation permeability and identify fluid contacts.

9. Production Logs: Measure flow rates and fluid properties during production operations, which can help diagnose wellbore and reservoir problems.

10. Temperature Logs: Measure temperature profiles within the wellbore, which can help identify fluid entry points, determine the presence of fluid movement, and estimate formation permeability.

11. Image Logs: Provide visual images of the wellbore and formation, which can help identify fractures, faults, and other structural features.

These different types of well logs provide valuable information about the wellbore, subsurface formations, reservoir characteristics, lithology, porosity, fluid presence, and other important parameters for reservoir evaluation, wellbore stability analysis, and production optimization.

Conclusion

Note that EnerGPT gave not just the what but the why. Temperature logs can be used to estimate permeability! That was news to me at least.