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Integration and creative thinking were recurring themes in the 2015 Discovery Thinking forums held at the AAPG Annual Conference and Exhibition (ACE) in Denver last month.
This is the story of the drilling of a costly ($60 million) Lahee A-1 well in the Colombian foothills, which presented significant deviations from the prognosticated stratigraphy halfway to the objective – and became an operational nuisance. Nonetheless, it is mainly a story of successful management and prompt response to the geological uncertainty.
In last month’s Geophysical Corner `we described the different poststack impedance inversion methods that are available in our seismic industry. In poststack seismic inversion – where there is no mode conversion at normal incidence – it is purely acoustic. P-wave impedance is the only information that can be estimated from poststack inversion of P-wave data.
The AAPG Latin America Region and the Geological Society of Peru invite participation in “Increasing the Recovery Factor in Mature Oil and Gas Fields,” a Geosciences Technology Workshop (GTW) to be held October 15-16 in Lima, Peru.
Seismic inversion for acoustic impedance is widely used in our industry today, mainly due to the ease and accuracy of interpretation of impedance data, but also because it allows an integrated approach to geological interpretation. This month’s column refers to “inversion” as the transformation of seismic amplitude data into acoustic impedance data.
The focus of the AAPG Angola Chapter's quarterly seminar was entitled GeoStreamers - The preferred broadband solution for Imaging and Characterization. Using dual-sensor streamer technology has not only allowed towing the streamer deeper in a quieter recording environment but has significantly increased the amount of reliably measured low frequency information without compromising the high frequencies and the AVO/AVA information.
Join us in Buenos Aires, Argentina 11-12 May for Extending Mature Fields' Life Cycles: The Role of New Technologies and Integrated Strategies, a Geosciences Technology Workshop organized in partnership with the Asociación Argentina de Geólogos y Geofísicos (AAGGP).
The Anadarko Basin granite wash play has been considered difficult to interpret both geologically and geophysically. Consequently, the application of seismic attribute analysis to mid-continent washes has not been widely published.
With technical sessions designed to have cross-discipline appeal across the industry, Buford Pollett, chairman of the AAPG technical subcommittee for OTC, said this year’s topics were specifically chosen to attract a broad spectrum of professionals.
Spectral decomposition of seismic data helps in the analysis of subtle stratigraphic plays and fractured reservoirs. The different methods used for decomposing the seismic data into individual frequency components within the seismic data bandwidth serve to transform the seismic data from the time domain to the frequency domain– and generate the spectral magnitude and phase components at every time-frequency sample.
Three-dimensional (3D) seismic-reflection surveys provide one of the most important data types for understanding subsurface depositional systems. Quantitative analysis is commonly restricted to geophysical interpretation of elastic properties of rocks in the subsurface. Wide availability of 3D seismic-reflection data and integration provide opportunities for quantitative analysis of subsurface stratigraphic sequences. Here, we integrate traditional seismic-stratigraphic interpretation with quantitative geomorphologic analysis and numerical modeling to explore new insights into submarine-channel evolution.
Request a visit from Jacob Covault!
In comparison with the known boundary conditions that promote salt deformation and flow in sedimentary basins, the processes involved with the mobilization of clay-rich detrital sediments are far less well established. This talk will use seismic examples in different tectonic settings to document the variety of shale geometries that can be formed under brittle and ductile deformations.
Request a visit from Juan I. Soto!
Around 170 million years ago, the Gulf of Mexico basin flooded catastrophically, and the pre-existing landscape, which had been a very rugged, arid, semi-desert world, was drowned beneath an inland sea of salt water. The drowned landscape was then buried under kilometers of salt, perfectly preserving the older topography. Now, with high-quality 3D seismic data, the salt appears as a transparent layer, and the details of the drowned world can be seen in exquisite detail, providing a unique snapshot of the world on the eve of the flooding event. We can map out hills and valleys, and a system of river gullies and a large, meandering river system. These rivers in turn fed into a deep central lake, whose surface was about 750m below global sea level. This new knowledge also reveals how the Louann Salt was deposited. In contrast to published models, the salt was deposited in a deep water, hypersaline sea. We can estimate the rate of deposition, and it was very fast; we believe that the entire thickness of several kilometers of salt was laid down in a few tens of thousands of years, making it possibly the fastest sustained deposition seen so far in the geological record.
Request a visit from Frank Peel!
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