Seismic amplitude anomalies associated with thick First Leo sandstone lenses, eastern Powder River basin, Wyoming

Geophysics ◽  
1981 ◽  
Vol 46 (11) ◽  
pp. 1519-1527 ◽  
Author(s):  
A. H. Balch ◽  
M. W. Lee ◽  
John J. Miller ◽  
Robert T. Ryder
Keyword(s):  
River Basin ◽  
Surface Profile ◽  
Seismic Profile ◽  
Powder River Basin ◽  
Seismic Profiles ◽  
Surface Reflection ◽  
Model Studies ◽  
Seismic Amplitude ◽  
Amplitude Anomaly ◽  
Middle Member

Several new discoveries of oil production in the Leo sandstone, an economic unit in the Pennsylvanian middle member of the Minnelusa formation, eastern Powder River basin, Wyoming‐Nebraska‐South Dakota, have renewed exploration interest in this area. Vertical seismic profiles (VSP) and model studies suggested that a measurable seismic amplitude anomaly is frequently associated with the thick First Leo sandstone lenses. To test this concept, a surface reflection seismic profile was run between two wells about 12 miles apart. The First Leo was present and productive in one well and thin and barren in the other. The surface profile shows the predicted amplitude anomaly at the well where a thick lens is known to exist. Two other First Leo amplitude anomalies also appear on the surface seismic profile between the two wells, which may indicate the presence of additional lenses.

Offset‐amplitude variation and controlled‐amplitude processing

Geophysics ◽  
1985 ◽  
Vol 50 (12) ◽  
pp. 2697-2708 ◽  
Author(s):  
Gary Yu
Keyword(s):  
Seismic Waves ◽  
Gulf Coast ◽  
Seismic Profile ◽  
Angle Of Incidence ◽  
Elastic Parameters ◽  
Amplitude Analysis ◽  
Coherent Noise ◽  
Seismic Amplitude ◽  
Amplitude Data ◽  
Amplitude Anomaly

The partition of plane seismic waves at plane interfaces introduces changes in seismic amplitude which vary with angle of incidence. These amplitude variations are a function of the elastic parameters of rocks on either side of the interface. Controlled‐amplitude processing is designed to obtain the true amplitude information which is geologic in origin. The offset‐amplitude information may be successfully used to predict the fluid type in reservoir sands. Various tests were carried out on a seismic profile from the Gulf Coast. The processing comparison emphasized the effects and pitfalls of trace equalization, coherent noise, offset, and surface‐related problems. Two wells drilled at amplitude anomaly locations confirmed the prediction of hydrocarbons from offset‐amplitude analysis. Furthermore, controlled‐amplitude processing provided clues in evaluating reservoir quality, which was not evident on the conventional relative amplitude data.

Latest Permian (Changhsingian) to Early Triassic (Induan-Olenekian) of the Mt Goodwin Sub-group at Blacktip gas field, southeastern Bonaparte Basin, Australia

2010 ◽  
Vol 50 (1) ◽  
pp. 203 ◽  
Author(s):  
John Gorter ◽  
Robert Nicoll ◽  
Andrea Caudullo ◽  
Robyn Purcell ◽  
Kon Kostas
Keyword(s):  
Depositional Environment ◽  
Early Triassic ◽  
Northern Australia ◽  
Seismic Profiles ◽  
Gas Field ◽  
Seismic Amplitude ◽  
Amplitude Anomaly ◽  
Wireline Logs ◽  
Geochemical Analyses ◽  
Integrated Study

Gas was discovered in intra-Mt Goodwin Sub-group sandstones (Ascalon Formation) of the southeastern Bonaparte Basin in Blacktip–1 in 2001 from a zone characterised by a discrete seismic amplitude anomaly. This integrated study uses wireline logs, cores, cuttings, palynology, micropaleontology and geochemical analyses to determine the depositional environment of the Mt Goodwin Sub-group reservoirs and the source rock potential of this large, latest Permian (Changhsingian) to Early Triassic (Induan Olenekian) section of the Bonaparte Basin in northern Australia. Specific outcomes include a better understanding of the Early Triassic reservoir sandstone depositional environment and recognition of marker horizons on electric logs and seismic profiles, resulting in a more consistent regional interpretive framework for the uppermost Permian (Changhsingian) and Early Triassic (Induan Olenekian), in the Bonaparte Basin.

To: “The use of verticle seismic profiles in seismic investigations of the earth,” June 1982, GEOPHYSICS.

Geophysics ◽  
1982 ◽  
Vol 47 (9) ◽  
pp. 1347-1347
Keyword(s):  
River Basin ◽  
Powder River Basin ◽  
Relative Amplitude ◽  
Seismic Profiles ◽  
Vertical Seismic Profiles ◽  
The Earth

In June 1982 Geophysics, the correct authors of “The use of vertical seismic profiles in seismic investigations of the earth” are A. H. Balch, M. W. Lee, J. J. Miller, and R. T. Ryder. R. T. Ryder was incorrectly listed as R. T. Taylor on the cover. The first two sentences of the caption for Figure 17 of the above paper (p. 917) should read “First Leo sand reflections and Minnekahta reflections from two wells in the eastern Powder River basin, Wyoming, from vertical seismic profiles (a) 50 ft thick Leo section, (b) Leo section 10 ft thick or less. Note the reduced relative amplitude of the Leo in (b).”

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