"Log-Inject-Log" (LIL) is not a standard term or technique used in reservoir engineering.

It's possible that you are referring to a specific proprietary method or a misheard term. Could you provide more context or information about the situation where you encountered this term?

Here are some common reservoir engineering techniques that might have been confused with LIL:

• Log Analysis: This involves interpreting well logs to determine reservoir properties such as porosity, permeability, and saturation. This is a foundational technique in reservoir engineering.
• Injection Logging: This is a type of well logging used during fluid injection operations (like waterflooding) to monitor the injection process and identify potential problems.
• Production Logging: This is used to monitor production from wells, including fluid flow rates and fluid compositions.
• Reservoir Simulation: This uses mathematical models to simulate fluid flow in a reservoir, enabling predictions of future production and optimization of field development.

If you can clarify the context of "Log-Inject-Log," I can help you understand its meaning or point you to the correct reservoir engineering technique.