Academic literature on the topic 'Carnarvon Region'
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Journal articles on the topic "Carnarvon Region"
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Sagala, Iko, and Mark Tingay. "Analysis of overpressure and its generating mechanisms in the northern Carnarvon Basin from drilling data." APPEA Journal 52, no. 1 (2012): 375. http://dx.doi.org/10.1071/aj11030.
Full textAbstract:
The Northern Carnarvon Basin is one of Australia’s most prolific hydrocarbon basins. Overpressure has been encountered in numerous wells drilled in the Northern Carnarvon Basin. Knowledge of overpressure distribution is important for drilling and exploration strategies, and understanding the origin of overpressure is essential for applying reliable pore pressure prediction techniques. Unconventional pore pressure indicators—primarily drilling kicks and the presence of connection gas—were used to improve an updated distribution of overpressure and to investigate the origin of overpressure in the Northern Carnarvon Basin. This unconventional dataset was compiled from 45 wells. Overpressures are observed in 40 wells and tend to occur near, or on, the Rankin Platform, Alpha Arch, and Barrow Trend. The presence of overpressure in this area coincides with the region of maximum Cenozoic deposition. Overpressured strata in the Northern Carnarvon Basin occurs through a wide stratigraphic range, from Late Triassic to Paleocene sequences. Generally, post Paleocene sequences in the Northern Carnarvon Basin are considered to be normally pressured. Porosity-vertical effective stress analysis in shale lithologies was used to investigate the origin of overpressure in the Northern Carnarvon Basin. Porosity-vertical effective stress plots from 28 wells in the Northern Carnarvon Basin identified 20 wells where the overpressure appears to be generated by disequilibrium compaction, and eight wells where the overpressure appears to be generated by a component of fluid expansion. Disequilibrium compaction mechanisms were the predominant cause of overpressure in wells around the Rankin Platform and areas located further away from the coast. Conversely, fluid expansion mechanisms were the predominant cause of overpressure in wells around the Alpha Arch and Bambra Trend, and an area located closer to the coast. These results broadly confirm those obtained from earlier studies and highlight the usefulness of kick and connection gas data in overpressure analysis.
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Ladbrook, Megan, Eddie J. B. van Etten, and William D. Stock. "Contemporary Fire Regimes of the Arid Carnarvon Basin Region of Western Australia." Fire 1, no. 3 (December 14, 2018): 51. http://dx.doi.org/10.3390/fire1030051.
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This study investigates the fire regime for the arid Carnarvon Basin region of Western Australia using remotely sensed imagery. A fire history database was constructed from satellite images to characterise the general fire regime and determine any effect of vegetation types and pre-fire weather and climate. The study area was divided into two sections (northern and southern) due to their inherently different vegetation and climate. A total of 23.8% (15,646 km2) of the study area was burnt during the 39-year study period. Heathland vegetation (54%) burnt the most extensively in the southern study area, and hummock grasslands (68%) in the northern. A single, unusually large fire in 2012 followed exceptional rains in the previous 12 months and accounted for 55% of the total burnt area. This fire burnt mainly through Acacia shrublands and woodlands rather than hummock grasslands, as normally experienced in the northern study area. Antecedent rainfall and fire weather were found to be the main meteorological factors driving fire size. Both study areas showed a moderate to strong correlation between fire size and increased pre-fire rainfall in the year preceding the fire. Predicted future changes in climate may lead to more frequent and higher intensity fires.
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Baillie, P. W., and E. Jacobson. "STRUCTURAL EVOLUTION OF THE CARNARVON TERRACE, WESTERN AUSTRALIA." APPEA Journal 35, no. 1 (1995): 321. http://dx.doi.org/10.1071/aj94020.
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The under-explored Carnarvon Terrace is situated offshore of the Cape Range area in the Carnarvon Basin near the boundary of the Gascoyne and Exmouth Sub-basins. The stratigraphy of the area is controlled by only two wells (Pendock-1, Yardie East-1), but several onshore wells aid interpretation of seismic data.Understanding of the structural evolution of the region is facilitated by interpretation of a high-resolution non-exclusive seismic survey acquired by Geco-Prakla in 1993 (GPCTR-93 Survey).Three major tectonic stages are responsible for the structural configuration of the region:Late Palaeozoic extension in the Gascoyne Sub-basin;continental break-up between Australia and Greater India which took place along a major fracture marked by the Flinders-Long Island-Learmonth fault system active in Late Triassic and Early Jurassic times; andthe collision between Australia and Asia that commenced in Miocene times and is continuing to the present day. This event, marked by wrench and compressional structures, and often reactivation of older structures, is one of the most economically important in Australian geological history.From a regional prospectivity viewpoint at least three plays are worthy of further investigation.
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Przeslawski, Rachel, Matthew A. McArthur, and Tara J. Anderson. "Infaunal biodiversity patterns from Carnarvon Shelf (Ningaloo Reef), Western Australia." Marine and Freshwater Research 64, no. 6 (2013): 573. http://dx.doi.org/10.1071/mf12240.
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Infauna are important in many ecological processes but have been rarely considered in biodiversity assessments of coral reefs and surrounding areas. We surveyed infaunal assemblages and associated environmental factors (depth, seabed reflectance, sediment characteristics) in three areas (Mandu, Point Cloates, Gnaraloo) along the Carnarvon Shelf, Western Australia. This region supports Ningaloo Reef, a relatively pristine coral reef protected by the Ningaloo Marine Park and a Commonwealth marine reserve. Macrofauna were sampled with a Smith-McIntyre grab and sieved through 500 µm. A total of 423 species and 4036 individuals was recorded from 145 grabs, with infauna accounting for 67% of species and 78% of individuals. Rare species (≤2 individuals per species) represented 42% of the total assemblage. Assemblages were significantly different among all three areas, with the most distinct recorded from the southern-most area (Gnaraloo). Although assemblages varied significantly with depth and sediment composition (mud and gravel), these relationships were weak. Results from the current study broadly quantify macrofaunal diversity in the region and identify potential spatial and environmental patterns which will help inform future marine management plans, including the provision of baseline information to assess the efficacy of protected areas in soft-sediment habitats adjacent to coral reefs.
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Gorter, J. D., and J. M. Davies. "UPPER PERMIAN CARBONATE RESERVOIRS OF THE NORTH WEST SHELF AND NORTHERN PERTH BASIN, AUSTRALIA." APPEA Journal 39, no. 1 (1999): 343. http://dx.doi.org/10.1071/aj98019.
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The Perth, Carnarvon, Browse, and Bonaparte basins contain Permian shallowmarine carbonates. Interbedded with clastic oil and gas reservoirs in the northern Perth Basin (Wagina Formation), and gas reservoirs in the Bonaparte Basin (Cape Hay and Tern formations), these carbonates also have the potential to contain significant hydrocarbon reservoirs. Limestone porosity may be related to the primary depositional fabric, or secondary processes such as dolomitisation, karstification, and fracturing. However, in the Upper Permian interval of the North West Shelf and northern Perth Basin, where there are no indications of significant preserved primary porosity in the limestones, all known permeable zones are associated with secondary porosity. Fractured Permian carbonates have the greatest reservoir potential in the Timor Sea. Tests of fractured Pearce Formation limestones in Kelp Deep–1 produced significant quantities of gas, and a test of fractured Dombey Formation limestone in Osprey–1 flowed significant quantities of water and associated gas. Minor fracture porosity was associated with gas shows in dolomitic limestones in Fennel–1 in the Carnarvon Basin, and fractures enhance the reservoir in the Woodada Field in the northern Perth Basin. Karst formation at sub-aerial unconformities can lead to the development of secondary porosity and caverns, as in the Carnarvon Basin around Dillson–1. Minor karst is also developed at the top Dombey Formation unconformity surface in the Timor Sea region.
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Cooper, Martin, Richard Midford, and Julie Anne Jaegar. "Carnarvon Partysafe: Designing a Community Mobilisation Project in Western Australia's Remote North West." Australian Journal of Primary Health 7, no. 3 (2001): 63. http://dx.doi.org/10.1071/py01048.
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Recent studies are increasingly shifting away from viewing drug and alcohol problems as individual medical disorders and recognising the significant role of environmental and community factors. In keeping with this, the Partysafe project, being implemented in the remote North West town of Carnarvon in Western Australia (WA), is utilising a community mobilisation approach to reducing harm associated with alcohol consumption in private residences. Carnarvon, like most rural communities in WA, has a higher rate of alcohol consumption than in the metropolitan region, hence its selection as the target site. An additional reason for selecting a remote town was the belief that national and state level prevention strategies cannot always be successfully implemented due to a region?s unique social and environmental influences. This paper discusses the community mobilisation methodology, giving a practical insight into the specific interventions and evaluation techniques developed for the Partysafe project. The process of identifying community-based alcohol issues and the problems associated with implementation and evaluation are illustrated. A combination of archival quantitative data and community based qualitative data will be used to assess the project?s success. Collection and use of this data is also practically depicted.
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CATULLO, RENEE A., PAUL DOUGHTY, J. DALE ROBERTS, and J. SCOTT KEOGH. "Multi-locus phylogeny and taxonomic revision of Uperoleia toadlets (Anura: Myobatrachidae) from the western arid zone of Australia, with a description of a new species." Zootaxa 2902, no. 1 (June 1, 2011): 1. http://dx.doi.org/10.11646/zootaxa.2902.1.1.
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We generated a multi-locus phylogeny to test monophyly and distributional limits in Australian toadlets of the genus Uperoleia from the western arid zone of Australia. The molecular data were used in combination with a detailed assessment of morphological variation and some data on call structure to complete a taxonomic revision of the species that occur in this region. Our work reveals the existence of not two but five species in the region. Uperoleia russelli is restricted to the Carnarvon and Gascoyne Regions south of the Pilbara. Uperoleia micromeles is distributed from the Tanami Desert through the Great Sandy Desert and along the northern edge of the Pilbara. Uperoleia talpa was previously believed to be a Fitzroyland region endemic but it is further distributed along Dampierland and into the Roebourne Plain. Uperoleia glandulosa is a larger species than previously described as well as a greater habitat generalist, inhabiting the rocky Pilbara region and the sandy region around Port Hedland. We also describe a new species, U. saxatilis sp. nov., endemic to the Pilbara craton.
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Tingate, P. R., A. Khaksar, P. van Ruth, D. Dewhurst, M. Raven, H. Young, R. Hillis, and K. Dodds. "GEOLOGICAL CONTROLS ON OVERPRESSURE IN THE NORTHERN CARNARVON BASIN." APPEA Journal 41, no. 1 (2001): 573. http://dx.doi.org/10.1071/aj00029.
Full textAbstract:
A small, but significant fraction of wells drilled in the Northern Carnarvon Basin have encountered problems with overpressure: better pore pressure prediction would improve safety and economy for drilling operations. In the Northern Carnarvon Basin the occurrence of overpressure and likely mechanisms are under investigation as part of the Australian Petroleum Cooperative Research Centre (APCRC) Research Program on Pore Pressure Prediction. Previous workers have proposed a number of mechanisms as the main cause of overpressure including undercompaction, hydrocarbon generation, horizontal stress and clay reactions.A preliminary regional study was undertaken incorporating over 400 well completion reports which identified approximately 60 wells with mud weights greater than 1.25 S.G. A subset of these wells was investigated and more reliable but much scarcer pressure indicators such as kicks or direct pressure measurements were examined. Depth-pressure profiles of wells across the region are variable and commonly show pressure compartmentalisation. Using a range of indicators, it was observed that overpressured strata in the Barrow Subbasin:occur over a wide depth range (2,500 to 4,000+ mbsl);occur over a wide stratigraphic range (Late Triassic to Late Cretaceous);are not regionally limited by major structural boundaries;are associated with sequences dominated by finegrained sediments with variable clay mineralogy; and in depositionally, or structurally, isolated sandstones; andmainly to the west of the Barrow and Dampier Subbasins around the Alpha Arch and Rankin Trend, coinciding with thickest Tertiary deposition.Previous published work in the study area has tended to support hydrocarbon generation as the primary cause of overpressure, though more recent publications have emphasised compaction disequilibrium. The log response (DT, RHOB and NPHI) of overpressured clay-rich strata has been investigated to constrain the type of overpressure mechanism. A normal compaction trend has been derived for four stratigraphic groupings; Muderong Shale, Barrow Group, Jurassic and Triassic. All overpressure occurrences were accompanied by an increase in sonic transit time. Not all wells have suitable log data for evaluation, but all stratigraphic groups show some evidence of elevated porosity associated with overpressure consistent with disequillibrium compaction as a dominant mechanism. Overpressures in the Barrow Group in Minden-1 and the Jurassic section within Zeepaard–1 do not have accompanying porosity anomalies suggesting a different overpressure mechanism model is needed.
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Blevin, J. E. "EXPLORATION HIGHLIGHTS FOR 2006." APPEA Journal 47, no. 2 (2007): 631. http://dx.doi.org/10.1071/aj06056.
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Key business indicators show an upward trend in exploration activity in Australia during 2006. The year was marked by fluctuating high oil prices, a strong uptake of acreage in most basins, and increased levels of drilling activity and seismic acquisition. Market demand for product, production infrastructure and the fruition of several development projects have pushed the level of exploration activity in both offshore and onshore basins. Despite this trend and the spread of tenements, almost all petroleum discoveries made during 2006 were located within 15 km of existing (but often undeveloped) fields.The Carnarvon Basin continued to be the focus of most offshore exploration activity during 2006, with the highest levels of 3D seismic acquisition and exploration/appraisal/development drilling in the country. Discoveries in the Carnarvon Basin also covered the broadest range of water depths—extending from the oil and gas discoveries made by Apache on the inboard margin of the Barrow Subbasin, to the deepwater gas discoveries at Clio–1 and Chandon–1 by Chevron. Several large gas discoveries were made in the Carnarvon and Bonaparte basins and provide significant tie-back opportunities to existing and planned infrastructure. The Bonaparte Basin also saw significantly increased levels of 2D and 3D seismic acquisition during 2006. Onshore, the Cooper/Eromanga basins continued to experience the highest level of drilling activity and seismic acquisition, while maintaining an overall high drilling success rate. For the first time in many years, data acquisition also occurred in frontier basins like the Daly (Northern Territory), Darling (New South Wales), Tasmanian (Tasmania) and Faust/Capel basins (Lord Howe Rise region).Coal seam methane (CSM) exploration maintained a strong performance in 2006, particularly in Queensland, while South Australia, Queensland and Victoria continue to lead the way with large tracts of acreage gazetted for geothermal energy exploration.
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Cockbain, A. E. "THE NORTH WEST SHELF." APPEA Journal 29, no. 1 (1989): 529. http://dx.doi.org/10.1071/aj88040.
Full textAbstract:
The region of the North West Shelf dealt with in this paper is underlain by three of the four basins which make up the Westralian Superbasin. The Bonaparte Basin lies outside the scope of this paper; the other basins are the Browse Basin, the offshore Canning Basin, here named the Western Canning Basin, and the offshore Carnarvon Basin, here called the Northern Carnarvon Basin. Sediments belonging to ten depositional sequences (Pz5, Mzl to Mz5, and Czl to Cz4) are present in the basins, the oldest being of Late Carboniferous and Permian age (Pz5).Deposition commenced in rift (interior fracture) basins under fluvial/deltaic conditions in the Late Permian/Early Triassic (Mzl), when the North West Shelf was part of Gondwana. Continental breakup took place in the Middle Jurassic (breakup unconformity between Mz2 and Mz3), and marine conditions prevailed over the Westralian Superbasin thereafter, with deposition taking place in a marginal sag setting. Siliciclastic sediments gave place to carbonates in the Late Cretaceous (Mz5) as the Indian Ocean grew larger.Parts of the area have been under permit since 1946, and to date some 227 exploration wells have been drilled. The most intensive exploration has taken place in the Northern Carnarvon Basin (191 wells), followed by the Browse Basin (20 wells), and Western Canning Basin (16 wells). Thirty- four economic and potentially economic discoveries have been made. The main target reservoirs are Triassic, Jurassic and Cretaceous, and the regional seals are Triassic and Cretaceous. The fields are of two types: pre- breakup unconformity (mainly tilted horst blocks), and post- breakup unconformity (usually four- way dip closures). Of the five producing fields, the North Rankin Gas Field is a pre- breakup field, while the four oil fields (Barrow, Harriet, South Pepper and North Herald) are all post- breakup.
Dissertations / Theses on the topic "Carnarvon Region"
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Lawrie, Misty Suanne. "Patterns of coastal tourism growth and multiple dwelling : implications for informal camping along the Ningaloo coastline." University of Western Australia. School of Earth and Geographical Sciences, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0222.
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Over the past few decades, the development of coastal areas has become an increasingly contested arena. For many years, tourism in remote coastal areas has been the preserve of a few intrepid campers, surfers and recreational fishers. More recently, however, numbers along parts of the coast have increased rapidly, not only contributing to an expansion of camping activity, but also pressure for more commercially oriented tourism. This has contributed to concerns about the environmental sustainability of tourism in remote coastal areas. Governments have increasingly been faced with the challenge of balancing ecological concerns with the pursuit of economic development. Adding to the complexity are the differing needs and demands of various segments of the tourism market all looking to enjoy particular places. Balancing the demands of campers, backpackers, package tourists and others in a single place is often wrought with conflict. This study explores some of these issues in a remote coastal area in Western Australia. The Ningaloo coast has evolved from a difficult to reach destination used by a small number of campers, to one of Western Australia's most popular tourist destinations in just two decades. The thesis examines the factors underlying the growth and change of tourism in the region, tracing its evolution from a few small rudimentary campsites to proposals for large scale resort developments. Of particular interest to this thesis is how planning and policy processes aim to address developmental pressures and resource use/planning conflicts. Additionally, this study provides an insight into the issues facing the informal, long term camper as the traditional segment of Ningaloo's tourism market. It examines how current planning and policy for the Ningaloo coastline affects this group by reshaping traditional tourism use of the area.
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Cathro, Donna Louise. "Three-dimensional stratal development of a carbonate-siliciclastic sedimentary regime, Northern Carnarvon Basin, Northwest Australia." Thesis, 2002. http://wwwlib.umi.com/cr/utexas/fullcit?p3108481.
Full textBook chapters on the topic "Carnarvon Region"
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Short, Andrew D. "Pilbara Region: Carnarvon, Pilbara and Canning Coasts." In Australian Coastal Systems, 131–90. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-14294-0_4.
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