scholarly journals Feeding herring schools do not react to seismic air gun surveys

2013 ◽  
Vol 70 (6) ◽  
pp. 1174-1180 ◽  
Author(s):  
Héctor Peña ◽  
Nils Olav Handegard ◽  
Egil Ona
Keyword(s):  
Swimming Speed ◽  
School Size ◽  
Response Speed ◽  
Seismic Survey ◽  
3D Seismic ◽  
Time Behaviour ◽  
Northern Norway ◽  
Air Gun ◽  
Strong Motivation ◽  
The Mean

Abstract Peña, H., Handegard, N. O. and Ona, E. 2013. Feeding herring schools do not react to seismic air gun surveys. – ICES Journal of Marine Science, 70: 1174–1180. The real-time behaviour of herring schools exposed to a full-scale 3D seismic survey off Vesterålen, northern Norway, was observed using an omnidirectional fisheries sonar. Throughout the study period, the herring swam slowly against the predominant northeast current, with a net displacement along with the current. The mean swimming speed after subtracting the drift velocities was 0.35 m s−1, and the mean response speed in the direction away from the air gun array was 0.22 m s−1. No changes were observed in swimming speed, swimming direction, or school size that could be attributed to the transmitting seismic vessel as it approached from a distance of 27 to 2 km, over a 6 h period. The unexpected lack of a response to the seismic survey was interpreted as a combination of a strong motivation for feeding, a lack of suddenness of the air gun stimulus, and an increased level of tolerance to the seismic shooting.

scholarly journals MARINE SEISMIC SURVEYS— A STUDY OF ENVIRONMENTAL IMPLICATIONS

2000 ◽  
Vol 40 (1) ◽  
pp. 692 ◽  
Author(s):  
R.D. McCauley ◽  
J. Fewtrell ◽  
A.J. Duncan ◽  
C. Jenner ◽  
M-N. Jenner ◽  
...  
Keyword(s):  
Sea Turtles ◽  
Seismic Source ◽  
Signal Propagation ◽  
Seismic Survey ◽  
Humpback Whales ◽  
Experimental Program ◽  
3D Seismic ◽  
Environmental Implications ◽  
Alarm Response ◽  
Air Gun

An experimental program was run by the Centre for Marine Science and Technology of Curtin University between March 1996 and October 1999 to study the environmental implications of offshore seismic survey noise. This work was initiated and sponsored by the Australian Petroleum Production and Exploration Association. The program:characterised air gun signal measurements; modelled air gun array sources and horizontal air gun signal propagation;developed an 'exposure model' to predict the scale of potential biological effects for a given seismic survey over its duration;made observations of humpback whales traversing a 3D seismic survey;carried out experiments of approaching humpback whales with a single operating air gun;carried out trials with an air gun approaching a cage containing sea turtles, fishes or squid; andmodelled the response of fish hearing systems to airgun signals.The generalised response of migrating humpback whales to a 3D seismic vessel was to take some avoidance manoeuvre at >4 km then to allow the seismic vessel to pass no closer than 3 km. Humpback pods containing cows which were involved in resting behaviour in key habitat types, as opposed to migrating animals, were more sensitive and showed an avoidance response estimated at 7−12 km from a large seismic source. Male humpbacks were attracted to a single operating air gun due to what was believed the similarity of an air gun signal and a whale breaching event (leaping clear of the water and slamming back in). Based on the response of captive animals to an approaching single air gun and scaling these results, indicated sea turtles displayed a general 'alarm' response at an estimated 2 km range from an operating seismic vessel and behaviour indicative of avoidance estimated at 1 km. Similar trials with captive fishes showed a generic fish 'alarm' response of swimming faster, swimming to the bottom, tightening school structure, or all three, at an estimated 2−5 km from a seismic source. Modelling the fish ear predicted that at ranges

Robust prestack Q-determination using surface seismic data: Part 2 — 3D case study

Geophysics ◽  
2012 ◽  
Vol 77 (1) ◽  
pp. B1-B10 ◽  
Author(s):  
Carl Reine ◽  
Roger Clark ◽  
Mirko van der Baan
Keyword(s):  
Seismic Data ◽  
Seismic Attenuation ◽  
Seismic Survey ◽  
Western Canada ◽  
3D Seismic ◽  
Independent Amplitude ◽  
Novel Method ◽  
The Mean ◽  
Zero Offset

In part one of this paper, we introduced a novel method of measuring seismic attenuation from prestack surface seismic data. This prestack Q-inversion (PSQI) employed methods to reduce the presence of spectral interference and then minimize the influence of interference that remains. By changing the domain of operation, angle-dependent effects in the overburden were eliminated when a locally 1D medium was assumed. To demonstrate the suitability of the PSQI method, we applied it to a 3D seismic survey from Western Canada. Preprocessing of the data was carried out to reduce noise, regularize amplitudes, and transform the seismic gathers into the [Formula: see text]-p domain prior to attenuation measurements. In addition to the seismic gathers, we also incorporated velocity data and zero-offset traveltime information. The result was that we were able to generate a map of 1/Q values which showed coherent patterns that could be explained by the presence of top gas in the reservoir. These measurements were correlated to independent amplitude attributes. We performed a number of other analyses to establish the appropriateness of the attenuation measurements. We compared 1/Q measurements with the predecessor QVO method, and showed that the PSQI measurements were less influenced by artifacts and were more robust to changes in the bandwidth of analysis. We also analyzed a VSP survey in the same geological setting and showed that the resulting measurement (1/Q = 0.0271) is very close to the mean PSQI value for the 3D survey (1/Q = 0.0312). This case study thus showed how the described PSQI method overcame many of the difficulties associated with obtaining accurate attenuation measurements from surface seismic data.

Optimization Of A 3D Seismic Survey Onshore Abu Dhabi - From Field Tests To Final Design

2000 ◽  
Author(s):  
Abu Baker Al Jeelani ◽  
Samer Marmash ◽  
Abdul Salam Bin Ishaq ◽  
Ahmed Al-Shaikh ◽  
Eric Kleiss ◽  
...  
Keyword(s):  
Field Tests ◽  
Seismic Survey ◽  
Abu Dhabi ◽  
3D Seismic ◽  
Final Design

Exploring for stratigraphic traps in the Patchawarra Formation, Cooper Basin: an integrated seismic methodology

2018 ◽  
Vol 58 (2) ◽  
pp. 779
Author(s):  
Alexandra Bennett
Keyword(s):  
Complex Geometry ◽  
Imaging Techniques ◽  
South Australia ◽  
Seismic Interpretation ◽  
Seismic Survey ◽  
3D Seismic ◽  
Seismic Resolution ◽  
Seismic Reflectivity ◽  
Seismic Area ◽  
Cooper Basin

The Patchawarra Formation is characterised by Permian aged fluvial sediments. The conventional hydrocarbon play lies within fluvial sandstones, attributed to point bar deposits and splays, that are typically overlain by floodbank deposits of shales, mudstones and coals. The nature of the deposition of these sands has resulted in the discovery of stratigraphic traps across the Western Flank of the Cooper Basin, South Australia. Various seismic techniques are being used to search for and identify these traps. High seismic reflectivity of the coals with the low reflectivity of the relatively thin sands, often below seismic resolution, masks a reservoir response. These factors, combined with complex geometry of these reservoirs, prove a difficult play to image and interpret. Standard seismic interpretation has proven challenging when attempting to map fluvial sands. Active project examples within a 196 km2 3D seismic survey detail an evolving seismic interpretation methodology, which is being used to improve the delineation of potential stratigraphic traps. This involves an integration of seismic processing, package mapping, seismic attributes and imaging techniques. The integrated seismic interpretation methodology has proven to be a successful approach in the discovery of stratigraphic and structural-stratigraphic combination traps in parts of the Cooper Basin and is being used to extend the play northwards into the 3D seismic area discussed.

Sierra de Reyes 3D seismic survey (onshore Argentina): depth imaging complex geology by applying multi-focusing, Kirchhoff, Beam and RTM workflows

First Break ◽  
2017 ◽  
Vol 35 (12) ◽  
Author(s):  
Pablo Borghi ◽  
David Curia ◽  
Martín Alayón ◽  
Paul Veeken ◽  
Ignacio Lescano ◽  
...  
Keyword(s):  
Seismic Survey ◽  
3D Seismic ◽  
Depth Imaging ◽  
Complex Geology

Innovative Data Processing QA/QC for the World's Largest 3D Seismic Survey

2020 ◽  
Author(s):  
Afra Al Dhaheri ◽  
Guillaume Cambois ◽  
Mohamed Mahgoub
Keyword(s):  
Data Processing ◽  
Seismic Survey ◽  
3D Seismic
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