The National Archive of Marine Seismic Surveys (NAMSS) is an archive of marine seismic reflection data hosted by the U.S. Geological Survey (USGS) that has been acquired by or contributed to the U.S Department of the Interior agencies. The archive contains a large, disparate set of surveys in SEG Y format from a variety of sources including WesternGeco, Chevron, and the Bureau of Ocean Energy Management (BOEM). New data is being added to the archive as it becomes available but as of January 2019, the archive contains 567 2D surveys covering 2,358,256km and 182 3D seismic surveys in waters surrounding the United States. All data is freely available.
Surveys acquired by the UK's Oil & Gas Authority in 2015, comprising nearly 20,000 line kilometres of newly acquired 2D broadband data, acquired and processed by WesternGeco. A further 20,000km of newly reprocessed legacy data also available, along with gravity and magnetics, and data from wells in the areas of interest. Published under the UK's Open Government Licence (compatible with Creative Commons Attribution Licence v4.0), and freely available to download (where practical) through CDA's UKOilandGasData system (free registration required). Field data is available on media.
Acquired under the UK Oil & Gas Authority's 2016 seismic programme and published under the Open Government Licence in 2017, these surveys comprise 19,000km of newly acquired 2D broadband seismic (by WesternGeco and PGS), including gravity and magnetic data. They are supplemented by a further 23,000km of newly reprocessed proprietary 2D seismic, including data acquired in the BGS' BIRPS deep seismic reflection survey. Data from over 200 wells in the areas of interest are also available. All data published is freely available to download (where practical) from CDA's UKOilandGasData system. Field data (or P-Up data for the PGS survey) is also available on media.
The Teapot Dome 3D Survey is a land 3D data set from Wyoming provided by the U.S. Department of Energy and RMOTC. After obtaining an FTP password, Post stack data, well logs, production history, and GIS data can be downloaded from the internet. Unprocessed prestack data is available via mail. For more information on the Teapot Dome 3D Survey, click here.
The Stratton 3D Survey is a small land 3D data set from South Texas. Files including raw field data with geometry, final migration, well loads, and inversion results can be anonymously downloaded from the Internet. Anyone who utilizes the Stratton seismic data in research, publishing or otherwise should acknowledge that the data were collected and made available for worldwide education and training by the Bureau of Economic Geology at the University of Texas at Austin.
This small marine 3D (plus wells) is offshore Netherlands. It is available in OpendTect format on the dGB Open Seismic Repository under a Creative Commons (CC BY-SA) license: F3 Complete. It is also available as a seismic-only dataset: F3 Seismic Only.
Geological Survey of Canada (GSC) is a branch of the Earth Sciences Sector of Natural Resources Canada. Energy geoscience research at the Geological Survey of Canada involves the characterization of sedimentary basins and the assessment of their hydrocarbon potential which is the critical first-step research needed to properly assess the resource potential of a sedimentary basin. GSC develops and applies resource assessment methodologies to support national energy supply forecasts, to support economic development and to inform land use and infrastructure planning decisions in areas of potential oil and gas development. Detailed resources can be found on webpae of NRC, here
This 2D land data, from the National Petroleum reserve Alaska, is provided by the U.S. Geological Survey (USGS). It is a short line with small statics. There is ground roll and noise bursts, but there is also good signal. Data includes unprocessed prestack data, final stack, and images of previous stack. Scripts for processing with Seismic Unix (su) are available. This is a good line to start experimenting with open data and su because there is a full processing sequence including data download, reformat, header loading, gain, prestack f-k filter, brute velocity estimation, brute stack, residual statics, final velocity analysis, final stack, and two types of post stack migration (phase shift and Kirchhoff migration). This 2D land data comes with executables for su release 43R1 on Linux, which is useful if su is not installed on your system. For more information on the Alaska 2D Land Line 31-81, click here.
The National Elevation Dataset (NED) is the primary elevation data product of the USGS. The NED is a seamless dataset with the best available raster elevation data of the conterminous United States, Alaska, Hawaii, and territorial islands. The NED is updated on a nominal two month cycle to integrate newly available, improved elevation source data. All NED data are public domain. NED data are available nationally (except for Alaska) at resolutions of 1 arc-second (about 30 meters) and 1/3 arc-second (about 10 meters), and in limited areas at 1/9 arc-second (about 3 meters). NED data are available for download here:
In marine 3-D surveys, the shooting direction (boat track) is called the inline direction; for land 3-D surveys, the receiver cable is along the inline direction. The direction that is perpendicular to the inline direction in a 3-D survey is called the crossline direction. In contrast to 2-D surveys in which line spacing can be as much as 1 km, the line spacing in 3-D surveys can be as small as 25 m. This dense coverage requires an accurate knowledge of shot and receiver locations.
A few hundred thousand to a few hundred million traces normally are collected during a 3-D survey. In a modern marine 3-D seismic survey, typically, more than 100 000 traces per square km are recorded. Most 3-D surveys are aimed at detailed delineation of already discovered oil and gas fields. Additionally, 3-D surveys are repeated over the same area at appropriate intervals, say every few years, to monitor changes in fluid saturation which may be inferred from changes in seismic amplitudes. By mapping changes in fluid saturation, changes in fluid flow directions may also be inferred and used for planning of production wells. To make use of seismic amplitudes for reservoir monitoring, however, data from all vintages must be processed consistently using a processing sequence aimed at preserving relative amplitudes. Seismic monitoring of oil and gas reservoirs by using time-lapsed 3-D surveys has come to be called the 4-D seismic method (4-D seismic method).
The basic principles of 2-D seismic data processing still apply to 3-D processing. In 2-D seismic data processing, traces are collected into common-midpoint (CMP) gathers to create a CMP stack. In 3-D data processing, traces are collected into common-cell gathers (bins) to create common-cell stacks. A common-cell gather coincides with a CMP gather for swath shooting. Typical cell sizes are 25 × 25 m for land surveys and 12.5 × 25 m for marine surveys.
Conventional 3-D recording geometries often complicate the process of stacking the data in a common-cell gather. Cable feathering in marine 3-D surveys can result in traveltime deviations from a single hyperbolic moveout within a common-cell gather. For land 3-D surveys, azimuth-dependent moveout within a common-cell gather is an issue.
OMNI 3D seismic survey design software helps you create optimal 2D and 3D designs for land, marine, ocean-bottom cable (OBC), transition zone, vertical seismic profile (VSP), and multicomponent surveys. Advanced analysis modules in the software enable you to examine geometry effects, analyze geometry artifacts, generate synthetics, and build and ray trace 2D and 3D geological models.
For years, seismic surveys have been a cornerstone of the American energy industry. New technologies have standardized and simplified the seismic survey process, and it's now commonplace for landowners in energy-rich regions to commission them at regular intervals. Although the legal guidelines that govern seismic surveys and other energy-related land uses have been well-established, it's important for landowners to keep a few things in mind.
Prospectors and drillers use seismic surveys to locate and catalog deposits of oil and natural gas. Modern seismic surveys are efficient, regimented processes that can provide detailed sub-surface pictures in two, three and even four dimensions. Land surveyors use specialized trucks that have been outfitted with sonar-like devices to record these images along a comprehensive grid. Since seismic surveys often cover large areas and produce localized images, they can have significant impacts on the land that they cover. It's not uncommon for surveyors to clear wide paths through brush or woodland to allow easy truck access. Moreover, the land survey process is a labor-intensive affair that can increase the likelihood of on-site accidents. Of course, the end result of a seismic survey is an informative and potentially lucrative map of the mineral resources of a given parcel.
In most states, firms that conduct seismic surveys aren't required to obtain explicit permissions from the landowners whose properties might be affected. Since surveys often cover wide tracts of land in areas with moderate population densities, it can be time-consuming and impractical to obtain permission from every single affected landowner. Moreover, advances in surveying technology have made it possible to conduct comprehensive surveys of smaller parcels from adjacent pieces of land. Surveying firms that gain access to privately or publicly held plots of land are legally obligated to compensate landowners for any damage or "non-normal use" that occurs during the process.
The seismic survey process is not inexpensive, and as a result, it demands careful preparation. Before setting foot on a target parcel, surveyors must study the land and set up a "plan of attack" that minimizes the duration and impact of the survey. If local or state law requires it, they may also need to obtain landowner permission, survey permits or public land-use permits. The pre-survey period also features a set-up phase during which surveyors place "listening" devices at carefully determined intervals. These pieces of equipment serve as the primary data-collection mechanism for modern geological surveys. 2b1af7f3a8