- published: 29 Aug 2011
- views: 455059
This short video explains -- to a non-seismologist -- the concept of seismic migration. Common Midpoint Stack, which was state of the art until the early 1970's, was able to produce seismic images with good signal-to-noise. However, the seismic events tend to be mis-positioned and cross one another, particularly when there is geologic dip. Migration is the process of correcting these dip and positioning errors as an automatic digital procedure. Only the seismic velocity must be known (which, unfortunately, is no small feat in many areas!).
John N. Louie, Applied Geophysics class at the University of Nevada, Reno, Lecture 7. http://crack.seismo.unr.edu/ftp/pub/louie/class/492-syll.html Reflection principles - profiling, sounding, NMO, dip. Text: 4.4.3-4.4.8, p. 176-186: W. Telford, L. Geldart, and R. Sheriff, Applied Geophysics, Cambridge Univ. Press, ISBN 0521339383. Seismic overheads 1: p. 33-37: http://crack.seismo.unr.edu/ftp/pub/louie/class/492/overheads/Seismic1.pdf Process your own seismic data with the point-and-click, open-source JRG/Viewmat system from http://crack.seismo.unr.edu/jrg
This is a social science video that answers - What is earthquake? - How does earthquake occur? - What are the different types of waves? An unexpected movement of the Earth's surface is called an earthquake. When two parts of the earth's surface move suddenly in relation to each other along a fault line, due to tectonic forces, an earthquake occurs. A tremendous amount of energy is released in the form of tremors and vibrations, such earthquakes are called 'Tectonic Earthquakes'. The point of origin of an earthquake is called the 'focus', while the point directly above it, on the surface of the earth is called the 'epicentre'. Owing to the strong vibrations around the point of origin, the degree of destruction is greater around the epicentre. The branch of knowledge that deals with the s...
John N. Louie, Applied Geophysics class at the University of Nevada, Reno, Lecture 9. http://crack.seismo.unr.edu/ftp/pub/louie/class/492-syll.html Reflection acquisition - phases, spatial aliasing, spreads, stack chart, signal/noise, field strategies. Text: 4.5.1-4.5.2, p. 186-192: W. Telford, L. Geldart, and R. Sheriff, Applied Geophysics, Cambridge Univ. Press, ISBN 0521339383. Seismic overheads 2: p. 1-52: http://crack.seismo.unr.edu/ftp/pub/louie/class/492/overheads/Seismic2.pdf Process your own seismic data with the point-and-click, open-source JRG/Viewmat system from http://crack.seismo.unr.edu/jrg
"Seismic migration" is the process by which seismic events are geometrically re-located in either space or time to the location the event occurred in the subsurface rather than the location that it was recorded at the surface, thereby creating a more accurate image of the subsurface. This process is necessary to overcome the limitations of geophysical methods imposed by areas of complex geology, such as: faults, salt bodies, folding, etc. Migration moves dipping reflectors to their true subsurface positions and collapses diffractions, resulting in a migrated image that typically has an increased spatial resolution and resolves areas of complex geology much better than non-migrated images. A form of migration is one of the standard data processing techniques for reflection-based geophysi...
VISTA is a leading geophysical software for 2D/3D seismic data processing.
A helpful animation and explanation of how geoscientists use 3D seismic exploration to find and drill for oil and natural gas energy fuel sources with great accuracy despite those energy resources being buried deep beneath the ground.
The development of 4D seismic data is bringing time information into seismic data. As the development of a field goes, oil recovery might become a challenge, as reservoir conditions will evolve with production. Enhanced Oil Recovery using CO2 injection can offer a solution for producing more and longer from a reservoir. Using 4D seismic data, the reservoir reaction to injections can be monitored through time and the placement of injection wells can be optimized. The introduction of a 4D QC tool in Paradigm® SeisEarth® brings to the desk of every interpreter a simple solution for analyzing seismic response changes on vintage volumes, and making geophysical analysis contribute to enhanced field development.
Seismic migration is the process by which seismic events are geometrically re-located in either space or time to the location the event occurred in the subsurface rather than the location that it was recorded at the surface, thereby creating a more accurate image of the subsurface. This process is necessary to overcome the limitations of geophysical methods imposed by areas of complex geology, such as: faults, salt bodies, folding, etc. Migration moves dipping reflectors to their true subsurface positions and collapses diffractions, resulting in a migrated image that typically has an increased spatial resolution and resolves areas of complex geology much better than non-migrated images. A form of migration is one of the standard data processing techniques for reflection-based geophysical m...
In this compact version of his EAGE Education Tour (EET 5), Jörg Herwanger (Ikon Science, previously Schlumberger) discusses the process of building and calibrating geomechanical models using 3D and 4D seismic data. He analyzes the three main uses that seismic data provide in building geomechanical models: horizon and fault interpretation for building structural models, AVO inversion and rock physics models for creating mechanical property models, and for model calibration. Herwanger elaborates on these three points in two case studies. The first case study presents a 3D exploration geomechanical model. The second study presents a 4D geomechanical model used for field development planning. The accompanying book is available in the EAGE bookshop: http://bookshop.eage.org/Webshop/product_de...
Seismic Data Processing This is how I install Promax R5000 Landmark. Promax is a software for seismic data processing. Note: Please don't ask me a license. / seismic acquisition and data processing using seismic software promax for advanced geosciences in seismic exploration by oil and gas company geophysical services geophysical surveys company /
At SIPES 2013 Annual Meeting, Deborah Sacrey, Consulting Geophysicist, discusses a case study involved a newly acquired 3D seismic volume in a fringe area of the Eagle Ford Shale Trend resource outline. The Self Organizing Map (SOM) analysis proved to be complementary to the interpretation of the data. The application of using SOM analysis in Paradise using selected seismic attributes can dramatically reduce uncertainty and thus decrease exploration risk in unconventional reservoirs. Transcription Summary: This afternoon we're going to talk about a new software I've been working on for the past couple years that was started by Tom Smith. The software involves unsupervised neural analysis using seismic attributes and trying to find anomalies in seismic data. What I want to talk about t...
Seismic exploration The second part of the new Wintershall series on oil looks at seismic exploration. Wintershall uses modern technologies such as 3D and seismic surveys to increase the discovery rate of crude oil.
The ocean is a world of sound. Seismic airgun testing, a method of searching for offshore oil and gas, threatens to turn that world upside down. Seismic blasts can injure or kill marine life, threaten the health of regional fisheries, and risk the jobs of those who depend on the ocean for their livelihood. This month, the Bureau of Ocean Energy Management (BOEM) is preparing an environmental impact statement (EIS) on seismic testing's potential expansion into the Mid and South Atlantic, and its recommendations will reach the White House. BOEM needs to consider the latest and best science on seismic, which exposes its many risks. Share the truth about seismic blasting and increase awareness about this deadly practice! For more info, visit: http://oceana.org/seismic