Archives: Glossary Terms

Velocity in the context of petroleum exploration and geology refers to the speed at which seismic waves travel through subsurface rock layers. It is a…

Amplitude refers to the strength or energy of a reflected seismic wave, measured as the maximum displacement from the zero baseline of a seismic trace.…

AVO stands for Amplitude Versus Offset (sometimes called Amplitude Variation with Offset). It is a seismic analysis technique used in petroleum exploration and reservoir characterization…

A Direct Hydrocarbon Indicator (DHI) is a geophysical anomaly observed on seismic reflection data that suggests the presence of hydrocarbons (oil or gas) in subsurface…

The Sonic Log, also known as an acoustic log or transit-time log, is a fundamental wireline logging measurement used in petroleum exploration and geology to…

The neutron log is a porosity-sensitive well log that measures the hydrogen concentration in subsurface formations. It is essential in oil and gas exploration and…

A density log is a well logging measurement that records the bulk density of a formation along the borehole wall. It is a fundamental tool…

The Gamma Ray Log is a fundamental well logging measurement used in Exploration & Geology to record the natural radioactivity of subsurface rock formations. It…

The resistivity log is a fundamental well log used in petroleum exploration and geology to measure the electrical resistivity (or its reciprocal, conductivity) of subsurface…

Petrophysics is the branch of earth science that studies the physical and chemical properties of rocks and their interactions with fluids (oil, gas, and water).…

Geophysics is the branch of Earth science that applies the principles of physics to study the physical properties and processes of the subsurface. In the…

Stratigraphy is the branch of geology that studies rock layers (strata) and layering. It focuses on the description, correlation, and interpretation of stratified rocks, their…