Based on the provided reference, GEOLOG refers to an integrated approach to wellsite geochemistry used to extract reservoir information.
In essence, GEOLOG is a system and process, rather than a physical object or profession. It's about applying geochemical techniques at the wellsite to understand reservoir properties.
Key Aspects of GEOLOG:
- Integrated Approach: GEOLOG combines different techniques into a unified system.
- Wellsite Geochemistry: It focuses on performing geochemical analyses directly at the location where the well is being drilled.
- Mud Gas Sampling: This involves collecting and analyzing gases present in the drilling mud.
- Cuttings Analysis: This involves studying the rock fragments (cuttings) brought to the surface during drilling.
- Reservoir Properties: The overall goal is to gain insights into the characteristics of the underground reservoir.
- Risk Mitigation: A key benefit is extracting information with no downhole risk, meaning it avoids the potential problems associated with lowering instruments into the well.
GEOLOG in Practice:
The GEOLOG system analyzes the chemical composition of mud gas and rock cuttings recovered during drilling. By identifying different hydrocarbon components and analyzing the mineralogy and organic content of the cuttings, experts can build a detailed picture of the reservoir.
This allows for:
- Improved understanding of reservoir quality: Identifying permeable zones.
- Determining hydrocarbon type: Distinguishing between oil and gas.
- Optimizing well placement: Making informed decisions about where to drill.
In summary, GEOLOG is an integrated geochemical workflow applied at the wellsite to maximize information extraction about a reservoir using mud gas sampling and cuttings analysis, without the risks associated with downhole tools.
