THE MOUNT ISA BASIN—DEFINITION, STRUCTURE AND PETROLEUM GEOLOGY

1993 ◽  
Vol 33 (1) ◽  
pp. 237 ◽  
Author(s):  
B.A. McConachie ◽  
M.G. Barlow ◽  
J.N. Dunster ◽  
R.A. Meaney ◽  
A.O. Schaap
Keyword(s):  
Individual Development ◽  
Petroleum Exploration ◽  
Structural Deformation ◽  
Seismic Exploration ◽  
Volcanic Complex ◽  
Arkoma Basin ◽  
Northern Margin ◽  
Mount Isa ◽  
Broken Hill ◽  
Definition Of

The Mount Isa Basin is a new concept to describe the area of Palaeo- to Mesoproterozoic rocks south of the Murphy Inlier (not the Murphy Tectonic Ridge) and inappropriately described as the Mount Isa Inlier. The new basin concept presented in this paper allows the characterisation of basin-wide structural deformation and the recognition of areas with petroleum exploration potential.The northern depositional margin of the Mount Isa Basin is the metamorphic, intrusive and volcanic complex referred to as the Murphy Inlier. The eastern, southern and western boundaries of the basin are obscured by younger basins (Carpentaria, Eromanga and Georgina Basins). The Murphy Inlier rocks comprise the seismic basement to the Mount Isa Basin sequence. Evidence for the continuity of the Mount Isa Basin with the McArthur Basin to the northwest and the Willyama Block (Basin) at Broken Hill to the south is presented. These areas combined with several other areas of similar age are believed to have comprised the Carpentarian Superbasin.The application of seismic exploration within Authority to Prospect (ATP) 423P at the northern margin of the basin was critical to the recognition and definition of the Mount Isa Basin. The northern Mount Isa Basin is structurally analogous to the Palaeozoic Arkoma Basin of Oklahoma and Arkansas in the southern USA but as with all basins it contains unique characteristics, a function of its individual development history. The northern Mount Isa Basin is defined as the basin area northwest of the Mount Gordon Fault.

scholarly journals The paradoxes of gerotranscendence: The theory of gerotranscendence in a cultural gerontological and post-modernist perspective

2009 ◽  
Vol 8 (2) ◽  
Author(s):  
Kirsten Thorsen
Keyword(s):  
Cultural Values ◽  
Cultural Change ◽  
Individual Development ◽  
Font Size ◽  
Theoretical Position ◽  
Ageing Processes ◽  
Historically Situated ◽  
Definition Of ◽  
Theory Of Gerotranscendence ◽  
Different Cultures

<strong><span style="font-family: TimesNewRomanPS-BoldMT;"><span style="font-family: TimesNewRomanPS-BoldMT;"><p align="left"> </p></span></span><span style="font-size: x-small; font-family: TimesNewRomanPS-BoldMT;"><span style="font-size: x-small; font-family: TimesNewRomanPS-BoldMT;">ABSTRACT</span></span></strong><span style="font-size: x-small; font-family: TimesNewRomanPSMT;"><span style="font-size: x-small; font-family: TimesNewRomanPSMT;"><p align="left">This article presents a theoretical analysis and discussion of the theory of gerotranscendence, formulated</p><p align="left">by Lars Tornstam (University of Uppsala, Sweden). The theory is presented as a meta-theory of</p><p align="left">ageing, as a theory of universal and general ageing processes. Ageing is seen as an urge (a drive)</p><p align="left">towards a less engaged posititon in the wordly life, moving towards a higher degree of transcendence,</p><p align="left">with a more cosmic outlook and another definition of reality. In this article the theory is discussed from</p><p align="left">another theoretical position; Ageing seen in a cultural gerontological perspective, as a varied culturally</p><p align="left">and historically situated phenomenon – differing in different times and different cultures. The theoretical</p><p align="left">perspective underlines that ageing is complex dialectical processes, an intertwined interplay between</p><p align="left">individual development and cultural change. The varied individual ageing processes are not seen</p><p align="left">as the result of «drives». In Western post-modern cultures the ageing processes are becoming manifold,</p><p align="left">often contradictory. Elderly present versions of the selves that are becoming complex, multiplied (multiple</p><p align="left">selves), acting at different scenes, stamped by varied cultural values, presenting mixed versions of</p><p align="left">activity and passivity, engagement and retractment, wordliness and transcendence.</p></span></span><strong><em><span style="font-size: x-small; font-family: TimesNewRomanPS-BoldItalicMT;"><span style="font-size: x-small; font-family: TimesNewRomanPS-BoldItalicMT;"><strong><em><span style="font-size: x-small; font-family: TimesNewRomanPS-BoldItalicMT;"><span style="font-size: x-small; font-family: TimesNewRomanPS-BoldItalicMT;"><p>Key words:</p></span></span></em></strong></span><strong><em><span style="font-size: x-small; font-family: TimesNewRomanPS-BoldItalicMT;"><p> </p></span></em></strong></span><p> </p></em><span style="font-size: x-small; font-family: TimesNewRomanPSMT;"><span style="font-size: x-small; font-family: TimesNewRomanPSMT;">Ageing theories; gerotranscendence; cultural gerontology; postmodernism</span></span></strong>

Artinskian conodonts from the Dingjiazhai Formation of the Baoshan Block, west Yunnan, southwest China

2002 ◽  
Vol 76 (4) ◽  
pp. 741-750 ◽  
Author(s):  
Katsumi Ueno ◽  
Yoshihiro Mizuno ◽  
Xiangdong Wang ◽  
Shilong Mei
Keyword(s):  
Southern Hemisphere ◽  
Southwest China ◽  
Warm Water ◽  
Early Permian ◽  
Northern Margin ◽  
Stratigraphic Unit ◽  
Current Definition ◽  
Conodont Fauna ◽  
Definition Of ◽  
First Time

Permian conodonts were recovered for the first time from the Dingjiazhai Formation, a well-known diamictite-bearing stratigraphic unit in the Gondwana-derived Baoshan Block in West Yunnan, Southwest China. The conodont fauna occurs in limestone units within the upper part of the formation and consists of Sweetognathus bucaramangus (Rabe), S. whitei (Rhodes), Mesogondolella bisselli (Clark and Behnken), and an unidentified ramiform element. Based on the known stratigraphic distribution of 5. bucaramangus (Rabe), the fauna is referable to the upper Sweetognathus whitei-Mesogondolella bisselli Zone, and thus is dated as middle Artinskian according to the current definition of the stage. The Dingjiazhai Formation is overlain paraconformably by the Woniusi Formation, which is represented mostly by basalts and basaltic volcaniclastics related to rifting volcanism during the separation of the Baoshan Block from Gondwanaland. The present discovery of conodonts from the upper part of the Dingjiazhai Formation reveals that the glaciogene diamictites in the Dingjiazhai Formation are older than middle Artinskian, and the inception of rifting volcanism of the Baoshan Block is later than middle Artinskian.Occurrence of an essentially warm water element, Sweetognathus bucaramangus (Rabe), in the Dingjiazhai conodont assemblage notwithstanding, the entire fossil faunas including brachiopods and fusulinoideans from the limestone units of the formation can be best interpreted as a middle latitudinal, non-tropical, and still substantially Gondwana-influenced assemblage developed at the northern margin of Gondwanaland just after deglaciation in the southern hemisphere during Early Permian time. This time could be regarded as the beginning of the Cimmerian Region, which had mixed or transitional paleobiogeographic characteristics between the Paleoequatorial Tethyan and cool/cold Gondwanan realms, and which became well developed during Middle Permian time.

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.

SIMPSON DESERT SUB-BASIN—A PROMISING PERMIAN TARGET

1973 ◽  
Vol 13 (1) ◽  
pp. 33
Author(s):  
George E. Williams
Keyword(s):  
Lower Jurassic ◽  
Source Rocks ◽  
Petroleum Exploration ◽  
Seismic Exploration ◽  
Upper Permian ◽  
Lower Permian ◽  
Geophysical Surveys ◽  
Carbonaceous Shales ◽  
Cap Rock ◽  
Simpson Desert

Sediments of three major basins occur in the Simpson Desert region of central Australia:Cambro -Ordovician dolomites and sandstones, and Siluro- Devonian conglomerates, sandstones and shales, related to the Amadeus Basin:Permian conglomerates, sandstones, shales and coals of the Simpson Desert Sub-basin, the extensive eastern lobe of the Pedirka Basin:Mesozoic sandstones and shales of the Eromanga Basin.Principal petroleum exploration interest is presently directed toward the Permian sediments, which have many features in common with the petroleum producing Permian section of the neighbouring Cooper Basin.Lower Permian sediments known from drilling in the Simpson Desert Sub-basin comprise glaciofluvial conglomerates and sandstones overlain by fluvial and lacustrine sandstones, silt-stones, shales and coals. The maximum thickness encountered in wells is 1,479 ft (448 m) in Mokari 1.Recent seismic exploration 50 to 100 mi (80-160 km) west of Poeppel Corner in the deeper part of the Simpson Desert Sub-basin indicates that an additional sediment package up to 1,500 ft (350 m) thick occurs at depths of 6,500 to 7,500 ft (2,000-2,300 m) between Lower Permian and Lower Jurassic sections. This sediment package, nowhere penetrated by drilling, may be Middle to Upper Permian and/or Triassic in age. It is of great significance to petroleum exploration in the sub-basin and substantially upgrades the hydrocarbon prospects of the region.Permian sediments in the Simpson Desert Sub-basin thin by onlap, wedge out and stripping over the crests of anticlinal growth structures. Crestal sediments probably comprise mainly porous sandstones, grading off-structure into thicker sequences containing carbonaceous shales and coals. Such carbonaceous potential source rocks are probably best developed in the deepest part of the sub-basin, where Triassic cap rock may also be present. Two particularly promising drilling targets—the Colson Anticline and the East Colson Anticline—have been revealed by recent geophysical surveys in this portion of the sub-basin. Wells drilled on these structures may intersect Permo-Triassic sediments up to 2,200 + ft (670 in) thick which are comparable in age and type with producing sections in the Cooper Basin.

GEOPHYSICAL RESEARCH AND PROGRESS IN EXPLORATION

Geophysics ◽  
1957 ◽  
Vol 22 (2) ◽  
pp. 412-433 ◽  
Author(s):  
Milton B. Dobrin ◽  
Henry F. Dunlap
Keyword(s):  
Large Scale ◽  
Gulf Coast ◽  
Academic Research ◽  
Geophysical Methods ◽  
Petroleum Exploration ◽  
Seismic Exploration ◽  
Annual Review ◽  
Neutron Generation ◽  
Geophysical Research ◽  
Research Activities

This paper, the SEG Research Committee’s second annual review of current developments in exploration geophysics, will emphasize research activities at universities and other non‐commercial institutions which relate closely to geophysical exploration. Industry developments worth noting in the seismic field include the considerable increase in use of magnetic recording, use of pressure‐sensitive geophones with preamplifiers in the bay and marsh areas of the Gulf Coast, use of fathometer‐type instruments to obtain near bottom layering in marine areas, and use of nonphotographic methods of reproducing seismic data. Considerable experimentation with weight dropping techniques, and with use of higher frequencies to get better resolution has continued during the past year. Use of models, particularly two dimensional models, is increasing. There have been significant innovations in logging techniques, particularly in the use of in‐hole accelerators for neutron generation, and in the development of in‐hole equipment for measuring gamma ray spectra. The use of continuous velocity logs is increasing. Academic research has been of two kinds. First, there are studies of basic physical principles underlying current or prospective exploration methods which could lead to improvements and new applications. Secondly, geophysical methods originally developed for petroleum exploration are being employed for large‐scale investigations of the earth’s crustal structure. These studies should contribute important information on the geology of such features as continental shelves, geosynclines, and mountain systems, information potentially useful to geologists for developing new concepts in exploration thinking. The two kinds of research illustrate the current interdependence between “pure” and “applied” geophysics. Important research projects on scattering, statistical improvement of signal‐to‐noise, explosionwave generation in the earth, and surface waves exemplify the activity going on in university laboratories today which may result in improved seismic exploration techniques tomorrow. Conversely, university‐sponsored seismic and gravity investigations of the deep oceans, the continental margins and various western mountain chains illustrate how geophysics is contributing basic geologic information on a regional to global scale.

Correlation of Olary and Broken Hill Domains, Curnamona Province:Possible Relationship to Mount Isa andOther North Australian Pb-Zn-Ag-Bearing Successions

2005 ◽  
Vol 100 (4) ◽  
pp. 663-676 ◽  
Author(s):  
R. W. Page ◽  
C. H. H. Conor ◽  
B. P. J. Stevens ◽  
G. M. Gibson ◽  
W. V. Preiss ◽  
...  
Keyword(s):  
Mount Isa ◽  
Broken Hill

scholarly journals A Compact Ocean Bottom Electromagnetic Receiver and Seismometer

2019 ◽  
Author(s):  
Kai Chen ◽  
Ming Deng ◽  
Zhongliang Wu ◽  
Xianhu Luo ◽  
Li Zhou
Keyword(s):  
Data Acquisition ◽  
Gas Hydrate ◽  
Operational Efficiency ◽  
Low Noise ◽  
Petroleum Exploration ◽  
Seismic Exploration ◽  
Base Line ◽  
Ocean Bottom ◽  
Battery Lifetime ◽  
Position Errors

Abstract. Joint marine electromagnetic (EM) and seismic interpretation are widely used for offshore gas hydrate and petroleum exploration, produce better estimates of lithology and fluids, and decrease the risk of low gas saturation. However, joint data acquisition is not commonly employed. Current marine EM data acquisition depends on an ocean bottom electromagnetic receiver (OBEM) and current seismic exploration methods use seismometers. Joint simultaneous data acquisition can decrease costs and improve efficiency; yet conventional independent data receivers have several drawbacks, including large size, high costs, position errors, and low operational efficiency. To address these limitations, we developed a compact ocean bottom electromagnetic receiver and seismometer (OBEMS). Based on existing ocean bottom E-field receiver (OBE) specifications, including low noise levels, low power consumption, and low clock-drift error, we integrated two induction coils for the magnetic sensor and a three-axis omnidirectional geophone for the seismic sensor and assembled an ultra-short base line (USBL) transponder as the position sensor, which improved position accuracy and operational efficiency while reducing field data acquisition costs. The resulting OBEMS has a noise level of 0.1 nV/m/rt (Hz) at 1 Hz in E-field and 0.1 pT/rt (Hz) at 1 Hz in B-field and a 30 day battery lifetime. It also supports a WiFi interface for configuring data acquisition parameters and data download. Offshore acquisition was performed to evaluate the system’s field performance during offshore gas hydrate exploration. The OBEMS functioned effectively throughout operation and field testing. The OBEMS therefore functions as a low cost, compact, and highly efficient joint data acquisition method.

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