NATURAL VERSUS ACTIVE REHABILITATION OF SEISMIC LINES INTHE COOPER BASIN

2000 ◽  
Vol 40 (1) ◽  
pp. 709
Author(s):  
D. Wiltshire
Keyword(s):  
Linear Connection ◽  
Seismic Line ◽  
Control Structures ◽  
Active Intervention ◽  
Land Systems ◽  
Lateral Erosion ◽  
Active Rehabilitation ◽  
Visual Impact ◽  
Seismic Lines ◽  
Cooper Basin

Extensive investigations undertaken in the Cooper Basin during the 1980s reveal that seismic lines prepared in dunefield and floodplain land systems rehabilitated naturally within a reasonable timeframe. It also appeared, however, that lines prepared in the dissected residual and gibber plains land systems would persist virtually indefinitely without active intervention. The principal issues were identified as being the ongoing aesthetic impacts of rocky windrows, ongoing expansion of erosion gullies and scars on hillsides and escarpments.Subsequently, an extensive seismic line restoration program was undertaken in gibber land units, in which graders were used to respread windrows over seismic lines, to install erosion control structures at the head of active gullies and to batter the edges of small erosion gullies. In general, the program was highly successful in reducing the visual impact of seismic lines and speeding the rehabilitation of small gullies.Active rehabilitation of large erosion gullies and scarred escarpments was not attempted, as it was considered that the process would be very expensive and would result in only marginal aesthetic improvements. Subsequent investigations have revealed that the lateral erosion and slumping of erosion gullies will, within a reasonable timeframe, result in the gullies resembling natural drainage features as revegetation occurs and the linear connection with the restored seismic line on the adjoining footslopes disappears.

A visual assessment of the recovery of 3D seismic lines in the Cooper Basin, South Australia

2016 ◽  
Vol 56 (1) ◽  
pp. 295
Author(s):  
Bridgette Doudy ◽  
David Cockshell
Keyword(s):  
Salt Lake ◽  
Accurate Determination ◽  
Seismic Exploration ◽  
3D Seismic ◽  
Seismic Line ◽  
Recovery Rates ◽  
Prime Concern ◽  
Land Systems ◽  
Seismic Lines ◽  
Cooper Basin

This report examines the recovery rates of 3D seismic lines in the Cooper Basin, SA, 1992–2015. There are now more than 70,103 km of 3D seismic line in the Cooper Basin. There are a variety of impacts caused by seismic exploration, with the visual impact being the prime concern raised by stakeholders. The recovery rates of 3D seismic lines vary between differing land systems. Some land systems, such as dune and floodplain, are dynamic, while others, such as gibber plain, are less so. A historical database consisting of 2,018 videos and photographs was used to score the visibility of seismic lines at various locations and times. A new methodology of visually scoring this data was created, using a scale ranging from 1 (the survey dominates the landscape) to 5 (the survey is no longer visible). Data analysis showed that seismic lines in dune land systems are likely to recover within seven years, seismic lines in floodplain land systems are likely to recover within eight years, and seismic lines in gibber plain land systems are likely to take 10–20 years to recover to a visibility score of 4 or 5. To arrive at a more accurate determination of seismic line recovery in salt lake, wetland and tableland land systems, more extensive data collection is recommended.

A SEISMIC MODEL OF FAULTS IN THE COOPER BASIN

1984 ◽  
Vol 24 (1) ◽  
pp. 421
Author(s):  
R. J. Gray ◽  
D. C. Roberts
Keyword(s):  
Hanging Wall ◽  
South Australia ◽  
Shadow Zone ◽  
Seismic Line ◽  
Seismic Section ◽  
Seismic Modelling ◽  
Geological Cross Section ◽  
Major Fault ◽  
Seismic Lines ◽  
Cooper Basin

A synthetic seismic section was modelled to help in the interpretation of Cooper Basin seismic lines which cross major faults and exhibit shadow zones.A major fault bounding the northwest flank of the Packsaddle Structure in the Merrimelia-Innamincka Farmout Block in South Australia was selected for modelling. A geological cross-section postulated on the basis of wells on either side of the fault was fed into the seismic modelling package AIMS (Advanced Interpretive Modelling System — licensed by Geoquest International Inc.) to produce a synthetic seismic line. This synthetic line provided a realistic match with an actual seismic line across the fault. Pre-stack migration of the actual seismic data is suggested to provide additional evidence for the reliability of the model.The shadow zone in the synthetic section is caused by dipping events in the fault shadow zone created by compaction of the Toolachee and Patchawarra Formations along the hanging wall of the fault plane. The dipping events cause reflected energy to be detected outside the fault zone. The large component of compaction within the Permian section is largely ascribed to thick coal horizons. The possibility of petroleum traps in the hanging wall of the fault is inferred and drilling is recommended.

scholarly journals CO2 uptake decreased and CH4 emissions increased in first two years of peatland seismic line restoration

2021 ◽  
Author(s):  
Megan Schmidt ◽  
Scott J. Davidson ◽  
Maria Strack
Keyword(s):  
Oil And Gas ◽  
Ecosystem Respiration ◽  
Tree Seedlings ◽  
Co2 Uptake ◽  
Seismic Line ◽  
Oil And Gas Exploration ◽  
Net Productivity ◽  
The Impact ◽  
Seismic Lines ◽  
Reference Areas

Abstract Oil and gas exploration has resulted in over 300,000 km of linear disturbances known as seismic lines, throughout boreal peatlands across Canada. Sites are left with altered hydrologic and topographic conditions that prevent tree re-establishment. Restoration efforts have concentrated on tree recovery through mechanical mounding to re-create microtopography and support planted tree seedlings to block sightlines and deter predator use, but little is known about the impact of seismic line disturbance or restoration on peatland carbon cycling. This study looked at two mounding treatments and compared carbon dioxide and methane fluxes to untreated lines and natural reference areas in the first two years post-restoration. We found no significant differences in net ecosystem CO2 exchange, but untreated seismic lines were slightly more productive than natural reference areas and mounding treatments. Both restoration treatments increased ecosystem respiration, decreased net productivity by 6–21 gCO2m− 2d− 1, and created areas of increased methane emissions, including an increase in the contribution of ebullition, of up to 2000 mgCH4m− 2d− 1. Further research on this site to assess the longer-term impacts of restoration, as well as application on other sites with varied conditions, will help determine if these restoration practices are effective.

ENVIRONMENTAL IMPACT OF SEISMIC OPERATIONS IN THE OTWAY BASIN, SOUTH AUSTRALIA

1994 ◽  
Vol 34 (1) ◽  
pp. 741 ◽  
Author(s):  
M. L. Williams ◽  
A. J. Boulton ◽  
M. Hyde ◽  
A. J. Kinnear ◽  
C. D. Cockshell
Keyword(s):  
Environmental Management ◽  
Environmental Impact ◽  
Vegetation Structure ◽  
South Australia ◽  
Petroleum Exploration ◽  
Seismic Exploration ◽  
Native Vegetation ◽  
Seismic Line ◽  
The Impact ◽  
Seismic Lines

The Department of Mines and Energy, South Australia (DME) contracted Michael Williams and Associates Pty Ltd to audit the environmental management of seismic exploration operations in the South Australian Otway Basin. The audit was carried out in early 1992 and covered petroleum exploration operators and DME environmental management systems. An innovative field sampling technique was developed to compare the environmental impact of two different seismic line clearing techniques. Recovery of native vegetation as measured by vegetation structure was also quantified.The audit found DME to have a dynamic and integrated environmental management system while company systems varied in standard. Wide consultation assisted the audit process.As a result of clearing for agriculture, native vegetation covers only six per cent of the Otway Basin. With the strict limitations to broad-scale vegetation clearance since the mid-1980s and the cessation since 1991, the greatest environmental impact of seismic exploration is the clearance of native vegetation for access by seismic vehicles. Native vegetation structure and associated abiotic variables on seismic lines and adjacent control sites, were subject to a classification and ordination analysis which compared the impact of seismic lines constructed by bulldozer or Hydro-ax (industrial slasher). Post-seismic recovery rates of three different vegetation associations were also determined. This analytical technique permits the effects of seismic line clearance to be compared with the natural variability of specific vegetation associations within a region. In interpreting the results however, there is a confounding effect of line type and year as most of the more recent seismic lines were constructed using a Hydro-ax. Results indicate that Hydro-ax clearing affects vegetation structure less than bulldozing. Most Hydro-ax sites recovered within a few years whereas some sites, bulldozed as early as 1971, particularly tussock grasslands, have not yet recovered.This study provides a significant break-through in the debate about the persistence of seismic impacts on native vegetation. As a rapid preliminary assessment, sampling vegetation structure rather than floristics, provides a cost-effective audit and monitoring technique which can be used by non-specialists in a range of petroleum exploration environments. Any significant structural differences may require more detailed analysis to determine if floristic composition also differed.

scholarly journals How linear features alter predator movement and the functional response

2012 ◽  
Vol 2 (2) ◽  
pp. 205-216 ◽  
Author(s):  
Hannah W. McKenzie ◽  
Evelyn H. Merrill ◽  
Raymond J. Spiteri ◽  
Mark A. Lewis
Keyword(s):  
Functional Response ◽  
Oil And Gas ◽  
First Passage Time ◽  
Elliptic Partial Differential Equation ◽  
Passage Time ◽  
Encounter Rate ◽  
Line Density ◽  
Time Model ◽  
Seismic Line ◽  
Seismic Lines

In areas of oil and gas exploration, seismic lines have been reported to alter the movement patterns of wolves ( Canis lupus ). We developed a mechanistic first passage time model, based on an anisotropic elliptic partial differential equation, and used this to explore how wolf movement responses to seismic lines influence the encounter rate of the wolves with their prey. The model was parametrized using 5 min GPS location data. These data showed that wolves travelled faster on seismic lines and had a higher probability of staying on a seismic line once they were on it. We simulated wolf movement on a range of seismic line densities and drew implications for the rate of predator–prey interactions as described by the functional response. The functional response exhibited a more than linear increase with respect to prey density (type III) as well as interactions with seismic line density. Encounter rates were significantly higher in landscapes with high seismic line density and were most pronounced at low prey densities. This suggests that prey at low population densities are at higher risk in environments with a high seismic line density unless they learn to avoid them.

scholarly journals Narrow anthropogenic corridors direct the movement of a generalist boreal butterfly

2018 ◽  
Vol 14 (2) ◽  
pp. 20170770 ◽  
Author(s):  
Federico Riva ◽  
John H. Acorn ◽  
Scott E. Nielsen
Keyword(s):  
Species Interactions ◽  
Boreal Forests ◽  
Oil Sands ◽  
The Arctic ◽  
Initial Direction ◽  
Seismic Line ◽  
Habitat Generalist ◽  
Seismic Lines ◽  
Vast Area ◽  
Petroleum Oil

Ecological and anthropogenic corridors are becoming more common worldwide, but little is known about how corridor size (width) affects species' movements, and thus their effects. Here we investigated whether 4- and 8-m wide anthropogenic corridors (seismic lines) cleared for petroleum (oil sands) exploration in boreal forests in Alberta, Canada, act on altering the behaviour of a habitat generalist butterfly, the Arctic fritillary ( Boloria chariclea ). Specifically, we captured 539 Arctic fritillaries and released them in seismic line corridor or control sites with no structural directionality (i.e. forests and clearings), and recorded both their initial direction (along the seismic line or not) and persistence in directional movements. Arctic fritillaries moved inside these lines twice as often as they left them, and maintained their initial direction more often, regardless of line size and independently of forest structure or sex of individuals. Thus, anthropogenic corridors as narrow as 4 m can affect insect movements. Given the vast area of boreal forests disturbed from seismic assessments, investigating if the effects of these dense, localized lines affect population dynamics and species interactions would provide important insights to managing this ecosystem and identifying restoration actions.

scholarly journals Interpretation of Paleo-Channel Based on Shallow Seismic Reflection Record in Banten Bay, Banten Province

2017 ◽  
Vol 31 (1) ◽  
Author(s):  
Yogi Noviadi
Keyword(s):  
Seismic Reflection ◽  
Single Channel ◽  
Sea Water ◽  
Seismic Refraction ◽  
Seismic Line ◽  
Reflection Seismic ◽  
Geological Setting ◽  
Shallow Seismic ◽  
Positioning Method ◽  
Seismic Lines

The objective of this study is to find out the pattern of paleo channel which was formed in Banten Bay and its surrounding.  The aims are to find out the paleo-channel pattern at study area. The study methods are including vessel positioning, and shallow seismic reflection work. Vessel positioning method is to locate the exact position of seismic work     when recording the data from single channel of shallow seismic reflection. Seismic line orientations are determined by regional geological setting of the area. Trend of seismic lines are dominantly north – south. In order to get the seismic data which could give geological setting configuration, seismic lines should be perpendicular to the strikes of the sediments.Based on the calculation of velocity of seismic refraction in sea water 1,500 meters/second, while within sediment 1,600 meters/second, it could be concluded that the paleo chanels were more or less in 32 meters below sea floor depth.This layer was the system that occur during the process of an interglacial on the Sunda Shelf when it was still a part of land that connects the Java, Sumatra and Kalimantan Islands. Paleo-channel deposits are characterized by subparalel - chaotic reflection character with a thickness between 5-35 meters.Keywords: Paleo-channels, seismic records and Banten BayMaksud dari penelitian ini adalah untuk mengetahui pola sungai purba yang terdapat di Teluk Banten dan sekitarnya, yang tujuannya adalah untuk mengetahui pola penyebaran alur sungai purba di daerah penelitian. Metode penelitian terdiri dari penentuan posisi kapal dan penelitian  seismik pantul dangkal. Penentuan posisi kapal berguna untuk menemukan posisi yang tepat saat merekam data oleh perlatan seismik saluran tunggal dangkal. Lokasi lintasan seismik disesuaikan dengan kondisi geologi daerah penelitian. Arah lintasan seismik pada umumnya berarah utara – selatan. Untuk mendapatkan data seismik yang bisa memberikan konfigurasi kondisi geologi, lintasan seismik harus tegak lurus terhadap kedudukan lapisan batuan.Berdasarkan cepat rambat gelombang seismik di air laut 1.500 meter/detik, dan sedimen 1.600 meter/ detik, dapat disimpulkan bahwa alur purba kurang lebih berada pada kedalaman  32 meter di bawah dasar laut.Lapisan ini merupakan sistem pengendapan yang terjadi selama proses interglasial di Paparan Sunda yang pada saat itu masih  merupakan bagian dari daratan yang menghubungkan P. Jawa, Sumatera dan P. Kalimantan. Endapan alur purba  dicirikan dengan pola refleksi subparalel sampai tidak beraturan dengan ketebalan antara 5-35 meter.Kata kunci: Alur purba, rekaman seismik dan teluk Banten

Structural and stratigraphic architecture of Australia's frontier onshore sedimentary basins: the Western Officer and Southern Carnarvon basins, Western Australia

2012 ◽  
Vol 52 (2) ◽  
pp. 670
Author(s):  
Lidena Carr ◽  
Russell Korsch ◽  
Arthur Mory ◽  
Roger Hocking ◽  
Sarah Marshall ◽  
...  
Keyword(s):  
Western Australia ◽  
Sedimentary Basins ◽  
Petroleum Exploration ◽  
Seismic Line ◽  
Seismic Reflection Data ◽  
Sequence Stratigraphic ◽  
Reflection Data ◽  
Half Graben ◽  
Seismic Lines ◽  
Carnarvon Basin

During the past five years, the Onshore Energy Security Program, funded by the Australian Government and conducted by Geoscience Australia, in conjunction with state and territory geological surveys, has acquired deep seismic reflection data across several frontier sedimentary basins to stimulate petroleum exploration in onshore Australia. This extended abstract presents data from two seismic lines collected in Western Australia in 2011. The 487 km long Yilgarn-Officer-Musgrave (YOM) seismic line crossed the western Officer Basin in Western Australia, and the 259 km long, Southern Carnarvon Seismic line crossed the Byro Sub-basin of the Southern Carnarvon Basin. The YOM survey imaged the Neoproterozoic to Devonian western Officer Basin, one of Australia's underexplored sedimentary basins with hydrocarbon potential. The survey data will also provide geoscientific knowledge on the architecture of Australia's crust and the relationship between the eastern Yilgarn Craton and the Musgrave Province. The Southern Carnarvon survey imaged the onshore section of the Ordovician to Permian Carnarvon Basin, which offshore is one of Australia's premier petroleum-producing provinces. The Byro Sub-basin is an underexplored depocentre with the potential for both hydrocarbon and geothermal energy. Where the seismic traverse crossed the Byro Sub-basin it imaged two relatively thick half graben, on west dipping bounding faults. Structural and sequence stratigraphic interpretations of the two seismic lines are presented in this extended abstract.

scholarly journals 2D Seismic Interpretation of the Meyal Area, Northern Potwar Deform Zone, Potwar Basin, Pakistan

2019 ◽  
Vol 11 (1) ◽  
pp. 1-16 ◽  
Author(s):  
Muhammad Riaz ◽  
Pimentel Nuno ◽  
Tehseen Zafar ◽  
Shahid Ghazi
Keyword(s):  
Travel Time ◽  
Hydrocarbon Exploration ◽  
Seismic Line ◽  
Subsurface Structures ◽  
The North ◽  
Isopach Maps ◽  
Potential Reservoir ◽  
Potwar Basin ◽  
Analytical Section ◽  
Seismic Lines

Abstract Meyal Field is considered as one of the chief hydrocarbon producing fields in the Potwar Basin, Pakistan. The present research emphasize on the subsurface structures affecting the Mesozoic-Cenozoic successions exclusively foremost reservoir units comprising the Eocene Chor Gali and Sakesar formations. Data from six seismic lines and three wells (aligned with those lines) have been deliberated comprehensively with remarkable and tremendous calibration. Five prominent and imperative reflectors specifically the Permian, Triassic, Jurassic, Paleocene and Eocene successions were interpreted through seismic tactics. Time structure maps were equipped on the basis of two-way travel time (TWT) of the seismic line. Likewise, four isopach maps portrayed the thickness discrepancy of prospective hydrocarbon strata. Structurally, analytical section reveals that the Meyal anticline is a plunging and faulted anticline. The pop-up structure is constrained by back-thrust from the north and fore-thrust from the south, on the dip lines. These maps depicted potential reservoir, demarcate promising site for future hydrocarbon exploration.

Quantification of signal and noise in two-way transmitted wavefields to improve well ties in Cooper Basin, Australia

2014 ◽  
Vol 2 (2) ◽  
pp. SD19-SD31 ◽  
Author(s):  
Chen Qi ◽  
Fred Hilterman
Keyword(s):  
High Amplitude ◽  
Synthetic Seismogram ◽  
Time Varying ◽  
Multiple Reflections ◽  
Seismic Line ◽  
Amplitude Noise ◽  
Coal Beds ◽  
Low Pass ◽  
Internal Multiples ◽  
Cooper Basin

Permian coal beds at 2400–2900 m depth in Cooper Basin, Australia have normal-incident reflection coefficient values as large as [Formula: see text]. If internal multiples are included in synthetic seismograms, excellent correlations exist between the synthetic seismogram and seismic, even when more than 50 coal beds are present. However, neither the synthetic seismogram nor the seismic tie the well-log lithologic boundaries because the incident wavefield that strikes a lithologic boundary and returns to the surface contains a signal wavelet followed by high-amplitude noise, which are interbed multiple reflections. Because the spectra of the signal and noise coda at a given two-way time normally do not overlap, time-varying Gaussian filters applied to the near-offset stack enhance the signal and suppress the noise coda. After filtering, the apparent time delay of reflections introduced by the coal beds is removed with variable time shifts (time compression), based on the estimated time-varying signal wavelets. The two-step process of low-pass filtering and compression yields seismic events that successfully tie the lithologic boundaries in the borehole, although with limited resolution. Our preliminary tests on a seismic line indicate that the horizon event associated with the base of a 500-m-thick coal sequence is more coherently imaged with our processing than with conventional processing.

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