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| Seismic Imaging | |
|---|---|
| Name | Seismic Imaging |
| Caption | Example of a seismic reflection section |
| Field | Geophysics |
| Techniques | Reflection seismology, Refraction seismology, Tomography |
| Applications | Hydrocarbon exploration, Earthquake studies, Engineering site characterization |
Seismic Imaging
Seismic imaging is a geophysical method that uses controlled or natural seismic waves to infer subsurface structure and properties. Developed within traditions of reflection seismology, refraction seismology, and seismic tomography, it underpins exploration projects for hydrocarbon exploration, informs earthquake hazard assessment, and supports civil engineering site characterization. Major institutions such as Society of Exploration Geophysicists, United States Geological Survey, BP, Schlumberger, and ExxonMobil have driven innovations alongside universities like Stanford University, Massachusetts Institute of Technology, University of Cambridge, and Imperial College London.
The method relies on generating or recording elastic waves from sources like controlled explosives, air gun arrays, or natural events such as tectonic earthquakes, then measuring arrivals at receivers including geophones, hydrophones, and borehole seismometers. Core principles include wave propagation governed by the wave equation in heterogeneous media, reflection at impedance contrasts defined by acoustic impedance and elastic modulus, and travel-time analysis that uses formulations from the eikonal equation and ray theory. Foundational figures and developments are linked to milestones like the Viking Graben exploration, technologies pioneered by companies such as WesternGeco, and methods influenced by mathematicians associated with the Courant Institute.
Survey design balances trade-offs among resolution, coverage, and cost in contexts ranging from onshore basins like the Permian Basin and North Sea to offshore provinces like the Gulf of Mexico and Barents Sea. Arrays and acquisition geometries employ concepts from fold (seismic) design, shot-receiver offset sampling, and wide-azimuth or full-azimuth surveys used in complex provinces such as the Gulf of Guinea and Caspian Sea. Acquisition platforms include marine vessels deploying streamers, land crews deploying geophones across terrains in the Siberian Basin or Amazon Basin, and borehole logging in projects at sites like Hess Deep. Environmental and regulatory frameworks intersect with agencies such as the Environmental Protection Agency and conventions like the Convention on Biological Diversity when planning marine surveys near areas like the Great Barrier Reef.
Processing pipelines transform raw traces through steps including deconvolution, velocity analysis, multiple suppression, and migration. Migration methods include integral solutions such as Kirchhoff migration used in projects on the Sakhalin Shelf, wave-equation migration applied in areas like the Gabon Basin, and reverse time migration developed at centers like Lawrence Livermore National Laboratory. Tomographic inversion and full-waveform inversion trace back to developments at Caltech, University of Oslo, and ETH Zurich, and utilize solvers implemented in software from vendors such as Petrel (software), Kingdom (software), and open-source projects inspired by work at Harvard University.
Interpreters correlate seismic reflectors with wells, cores, and logs from operators such as Chevron, TotalEnergies, and ConocoPhillips, integrating data like well logs (gamma ray, sonic), core descriptions from expeditions such as those by the International Ocean Discovery Program, and production data. Rock physics models link elastic properties to lithology and fluid content with theoretical foundations from researchers associated with Society of Petroleum Engineers publications and experimental facilities like Los Alamos National Laboratory. Quantitative interpretation uses inversion workflows, seismic attributes, and machine learning drawn from collaborations with groups at Google Research, DeepMind, and academic labs at University of Texas at Austin.
Seismic imaging enabled major discoveries in provinces including the North Sea oil fields, Gulf of Mexico deepwater plays, and the Orphan Basin. It supports earthquake source studies for events like the 2011 Tōhoku earthquake and the 2010 Haiti earthquake, and underpins monitoring initiatives such as CO2 sequestration projects at demonstration sites including Sleipner (CO2 storage). Engineering applications inform dam and tunnel projects like Hoover Dam assessments and urban site characterization in cities such as Los Angeles and Paris.
Limitations arise from finite frequency bandwidth, limited fold and azimuth coverage in areas like the Arctic, anisotropy in formations such as shale sequences in the Marcellus Formation, and complex overburden including salt bodies exemplified by the Gulf of Mexico salt diapirs. Uncertainty quantification uses methods from statistical inversion, Bayesian frameworks advanced by groups at University College London and Princeton University, and QC protocols standardized by organizations such as the International Organization for Standardization (ISO). Data quality is impacted by noise sources ranging from ship traffic to surface waves in permafrost regions of Sakha Republic.
Recent advances include machine learning–driven denoising and interpretation workflows with contributions from Facebook AI Research, real-time processing on cloud platforms like Amazon Web Services and Microsoft Azure, and deployment of large-N passive arrays in studies by teams at University of California, Berkeley and Columbia University. Research frontiers involve joint inversion integrating gravity and electromagnetic data, distributed acoustic sensing using fiber optic cables in experiments under mentors from Schlumberger-Doll Research, and improvements in computational imaging leveraging exascale systems at facilities such as Oak Ridge National Laboratory. Policy and investment decisions by entities like World Bank and International Energy Agency influence deployment in energy transition and subsurface stewardship projects.
Category:Geophysical techniques