ASTM D4631

ASTM D4631 is a technical standard for determining the transmissivity and storativity of low permeability rocks using in situ pressure pulse measurements. It is relevant when engineers and geoscience professionals need field-based data on how these rocks respond to pressure changes and store or transmit fluid. By focusing on direct measurement in the subsurface, the standard supports more consistent evaluation of formation behavior, helping reduce uncertainty in testing and engineering decisions.

What is ASTM D4631?

ASTM D4631, titled Standard Test Method for Determining Transmissivity and Storativity of Low Permeability Rocks by In Situ Measurements Using Pressure Pulse Technique, describes a test method for measuring hydraulic response in low permeability rock formations. The pressure pulse technique is used to observe how pressure changes move through the formation and how much fluid the rock can transmit or store. This makes the standard useful for technically consistent in situ assessment where laboratory-only results may not fully represent field conditions.

Where is ASTM D4631 used?

This standard is commonly used in subsurface testing programs where low permeability rocks must be evaluated under actual field conditions. It may be applied in geotechnical, hydrogeologic, or reservoir-related workflows that rely on pressure pulse measurements from wells, boreholes, or similar in situ test setups. ASTM D4631 is particularly relevant when the goal is to characterize formations that do not transmit fluids readily, making careful measurement and interpretation important.

Why is ASTM D4631 important?

ASTM D4631 helps create a consistent basis for testing and comparing low permeability rock behavior. That consistency matters for compliance, technical review, and procurement decisions where reliable subsurface data are needed. By standardizing the pressure pulse approach, the method supports better quality control, reduces variability between test programs, and improves confidence in transmissivity and storativity results used for engineering or performance evaluation. ASTM D4631 can therefore help lower risk in project planning and interpretation.

• In situ pressure pulse technique
• Low permeability rock testing
• Transmissivity measurement
• Storativity evaluation
• Subsurface field assessment