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Stage 2 of 7 Geophysics
Seismic images of the subsurface: the reflection principle, land acquisition with vibroseis, and processing and interpretation up to choosing the exploration well location.
Heavy trucks lower a steel baseplate onto the ground and shake it with a frequency sweep for several seconds, sending seismic waves deep into the layers.
Related: Land seismic acquisition: vibroseis and fold →The rings around the trucks show the spreading wave. At each boundary between layers of different impedance, part of it reflects back to the surface.
Related: Seismic reflection basics →Small sensors planted in the sand along straight lines turn ground motion into an electrical signal. Each group gives one channel in the recording.
Related: Land seismic acquisition: vibroseis and fold →The mobile recording room controls the source, collects signals from thousands of channels and checks their quality before sending them to processing.
Related: Seismic processing and interpretation →The cable links the geophone groups to the recording room. In modern systems autonomous wireless nodes replace it.
Crew and maintenance cabins. A seismic crew lives in a mobile camp that moves with the work, and desert driving is its biggest risk.
Related: Desert journey management →How a geophysicist sends a sound wave into the earth and reads its echo: acoustic impedance, reflection coefficient, converting two-way time to depth, resolution, and why a gas sand can appear as a "bright spot", with worked examples.
Technicians: how it worksHow a seismic crew works in the desert: vibrator trucks and the sweep, geophones and receiver lines, 2D versus 3D, calculating fold and bin size, the near-surface problem in dunes, and crew safety.
Engineers: calculations & HSEHow raw seismic data become an image of the layers: corrections, deconvolution, velocity analysis and NMO, stacking and migration, then how the interpreter maps horizons and faults, defines the trap and estimates the chance of success, with worked examples.
After the seismic image come geology, well logs and reservoir engineering.
Open-access book on reservoir simulation featuring practical examples with MRST .
MIT OpenCourseWare introduction to geology: minerals, rocks, and geological processes.
Fundamentals of seismic wave propagation underlying seismic exploration.
Open university textbook on physical geology: rocks, stratigraphy, and structures—foundations for understanding reservoirs.
Phase behavior of natural gas and condensate, and reservoir fluid properties.
Sedimentary rocks and depositional environments: the primary host rocks for oil and gas.