Browse by topic
Cross-book study paths through the OgbonLab library. Each topic collects the sections that teach one idea, from first principles to working practice, every one with live interactive widgets.
AVO and Amplitude Analysis
How reflection amplitude changes with angle, and what that says about the rock. Start from the Zoeppritz equations, linearize to Shuey's intercept and.
Well Ties and Synthetic Seismograms
The well tie is where seismic meets ground truth. Build a reflectivity series from a real log, convolve it with a wavelet, and compare the synthetic against.
Seismic Migration and Imaging
Migration moves recorded energy back to where it reflected. Compare post-stack and pre-stack approaches, time versus depth imaging, and Kirchhoff versus.
Kriging and Spatial Estimation
Kriging is least-squares estimation built on a variogram. Derive simple kriging from first principles, add the unbiasedness constraint for ordinary kriging,.
Variograms and Spatial Continuity
The variogram is the workhorse of spatial statistics: it measures how quickly a property decorrelates with distance.
Gassmann Fluid Substitution
Gassmann's equation predicts how a rock's seismic response changes when brine gives way to oil or gas.
Seismic Wavelets and Resolution
Everything a seismic image can show is limited by the wavelet. Meet the Ricker, understand bandwidth and phase, and see how tuning sets the thinnest bed you.
Fourier Analysis for Geophysics
The Fourier transform is the lens every geophysicist looks through. Build intuition slowly with interactive decompositions, then follow the idea into.
Seismic Inversion
Inversion turns reflection data back into rock properties. Go from reflectivity to acoustic impedance, pose the inverse problem mathematically, and follow.
Rock Physics
Rock physics is the bridge between reservoir properties and seismic response. Work through the elastic moduli, Vp/Vs ratio and impedance, then connect.
Machine Learning for Seismic Data
Where learned models genuinely help in seismic workflows and where they do not. Covers CNN denoising, interpolation, fault detection with synthetic training.
Seismic Anisotropy
Real rocks are not isotropic: velocity depends on direction. Learn the Thomsen parameters, VTI and TTI media, and azimuthal signatures of fractures and.
Geostatistical Simulation
Kriging gives one smooth map; simulation gives many rough, equally probable ones. Understand why that matters for uncertainty, then build sequential.
Well Logs and Petrophysics
How to read the rock from wireline logs. Porosity from density and neutron measurements, water saturation from resistivity, and the corrections that keep.
Wave Equations and Seismic Modeling
The wave equation underlies everything in seismology. Derive it, discretize it, and run finite-difference propagation live in the browser, then compare full.
Bayesian and Probabilistic Methods
Probability as a working tool: Bayes' rule for classification, priors and posteriors in geoscience inference, and uncertainty quantification for.
Geomechanics and In-Situ Stress
The subsurface as a structure carrying load. Resolve the stress tensor, place a field in the frictional polygon, turn the stresses into a mud-weight window.
Induced Seismicity and Fault Reactivation
When pressure changes move faults. Resolve stress onto a fault, read its slip tendency, compute the pressure it takes to reactivate it, bound the magnitude.