RECENT INFORMATION AND PROSPECTS IN THE KIDSON SUB-BASIN

1971 ◽  
Vol 11 (1) ◽  
pp. 53
Author(s):  
K. J. Creevey
Keyword(s):  
Middle Devonian ◽  
Seismic Refraction ◽  
Canning Basin ◽  
Recent Information ◽  
Geomorphological Mapping ◽  
Wet Gas ◽  
Refraction Seismic ◽  
Mapping Techniques ◽  
Surface Geology ◽  
Red Bed

A deep sedimentary depression, the Kidson Sub-basin, has been indicated within the southern Canning Basin by gravity and aeromagnetism. The wells, Sahara 1, Kidson 1 and Wilson Cliffs 1, showed that at least 15,000 feet of Phanaerozoic sediments were present. This paper aims to summarise information given by these wells and to indicate prospects and techniques for further exploration in the sub-basin.Previous surface geology had indicated Mesozoic and Permian sediments in the area bordered by Proterozoic outcrop. Geomorphological mapping techniques have been successfully used by Aquitaine to indicate possible structures for seismic work.Seismic results from Wapet and Aquitaine indicate gentle diastrophism within the sub-basin with the existence of a palaeogeographic limit to pre-Permian sediments in the east.The western Canning Basin had previously shown a Mesozoic and Permian sequence overlaying Ordovician shales, limestones and sandstones on igneous and metamorphic basement.Sahara 1, and later Kidson 1 and Wilson Cliffs 1, proved the presence of a Middle and pre-Middle Devonian limestone — red bed — evaporite sequence in the sub-basin: the MellinjerieLimestone, Tandalgoo Red Beds and Carribuddy Formation. The underlying Ordovician shales and tight sandstones in Wilson Cliffs 1 can be correlated with the Horn Valley to Pacoota Formations in the Amadeus Basin. In Wilson Cliffs 1 these sandstones overlie Proterozoic shales.The only show noted was minor wet gas associated with Ordovician dolomites in Wilson Cliffs 1. A major petroleum prospect of the sub-basin could be sought in improvement in the reservoir capabilities of the Ordovician sandstones along the palaegeographic eastern margin of the basin.Favourable pinchout forms of these Ordovician sandstones have been found by recent refraction seismic. Refraction, combined with gravity, geomorphology and detailed seismic techniques, can outline drillable prospects along the Kidson Sub-basin.

The seismic refraction method: A viable tool for mapping shallow targets into the 1990s

Geophysics ◽  
1989 ◽  
Vol 54 (12) ◽  
pp. 1535-1542 ◽  
Author(s):  
Robert W. Lankston
Keyword(s):  
Function Analysis ◽  
Seismic Refraction ◽  
Data Interpretation ◽  
Control Factor ◽  
A Value ◽  
Refraction Method ◽  
Refraction Seismic ◽  
Hidden Layer ◽  
Reciprocal Method ◽  
Interpretation Method

Geometrical considerations show that first arrivals can be recorded from below hidden layers. A certain minimum amount of data must be collected in order to resolve lateral versus vertical subsurface changes and thereby to determine the interpretation method. Field procedures, therefore, are independent of the interpretation method. The optimum XY parameter in the generalized reciprocal method (GRM) of processing refraction seismic data is significant as a quality control factor in refraction data interpretation. By comparison of the optimum XY value that is recovered through velocity analysis and time‐depth function analysis with a value for optimum XY that is calculated from the migrated depth section, the hidden‐layer condition can be recognized. In addition to identifying the hidden‐layer condition on the basis of first arrivals alone, the GRM allows the hidden layers to be accommodated; and depth precisions of less than 5% are possible.

Applications of geophysical techniques in permafrost regions

1977 ◽  
Vol 14 (1) ◽  
pp. 117-127 ◽  
Author(s):  
W. J. Scott ◽  
J. A. Hunter
Keyword(s):  
Seismic Velocity ◽  
Seismic Refraction ◽  
Beaufort Sea ◽  
Test Site ◽  
The Arctic ◽  
Seismic Profiles ◽  
Refraction Seismic ◽  
Lake Bottom ◽  
Ice Content ◽  
The Hill

This paper reports the results of some recent geophysical experiments carried out in the Arctic with a variety of methods. In the Beaufort Sea, seismic refraction profiles obtained with both source and receivers on the seabottom indicate the presence of discontinuous near-bottom high-velocity (4200 m/s) material interpreted to be presently aggrading permafrost. Spring-time resistivity soundings taken through the ice in Kugmallit Bay, Beaufort Sea, show the top of permafrost at about 50 m below the bottom. Even for 5-km spreads, the base of permafrost was not observed.Off the southeast coast of Melville Island, refraction seismic profiles shot on the seabottom and resistivity soundings made through summer ice yielded data which correlate with known sub-bottom geology, but which gave no clear indication of either presence or absence of permafrost.Seismic and resistivity measurements made at a number of control sites in the Arctic Islands yielded typical velocities of 3500 m/s and resistivities of 1 × 106 ohm-m for ice-saturated sands. Some correlation was observed between seismic velocity and moisture contents in the range from 10% to 40%.Seismic and resistivity results in IOL Lake at the Involuted Hill test site, Tuktoyaktuk Peninsula, suggest the absence of permafrost under some parts of the lake bottom. On the hill itself, seismic up-hole shooting and VLF resistivity profiling give interpretations of ice distribution which correlate well with drill control. Gamma-gamma logs taken in some of the drill holes correlate well with ice content logged during drilling.

Efficiency Of Integrated Seismic Methods Approach To Near-Surface Characterization

2020 ◽  
Author(s):  
Irena Gjorgjeska ◽  
Vlatko Sheshov ◽  
Kemal Edip ◽  
Dragi Dojchinovski
Keyword(s):  
Surface Characterization ◽  
Seismic Refraction ◽  
Geophysical Methods ◽  
Cost Effective ◽  
Integrated Approach ◽  
Image Resolution ◽  
Future Research ◽  
Near Surface ◽  
Seismic Methods ◽  
Refraction Seismic

<p>Surface seismic methods are among the most popular, widely accepted, geophysical methods for near-surface characterization. The most practical and effective way to perform in-situ measurements and data processing using different seismic methods as are seismic refraction, seismic reflection and MASW method in an integrated approach is presented in this paper. Each method has some advantages and limitations, but their application in an integrated approach provides higher accuracy in subsurface modeling. The same seismic equipment and, in most of the cases, the same acquisition parameters were used, enabling time and cost effective survey for subsurface characterization. The choice of these parameters was not random. Experimental research by use of the above-mentioned seismic methods was carried out in a long period in order to define the optimal parameters for successful application of an integrated technique in future research. During this survey, particular attention was paid to the influence of the acquisition parameters on the dispersion image resolution in the MASW surveys and extraction of an effective dispersion curve.</p><p>The results of the performed surveys at characteristic locations in R. North Macedonia are presented to show the efficiency of the combined methods approach.</p>

scholarly journals NON-DESTRUCTIVE INVESTIGATION ON SMALL EARTH DAMS USING GEOPHYSICAL METHODS: SEISMIC SURFACE WAVE MULTICHANNEL ANALYSIS (MASW) AND S-WAVE REFRACTION SEISMIC METHODS

2020 ◽  
Vol 38 (1) ◽  
pp. 5
Author(s):  
Leonides Guireli Netto ◽  
Otavio Coaracy Brasil Gandolfo ◽  
Walter Malagutti Filho ◽  
João Carlos Dourado
Keyword(s):  
Seismic Refraction ◽  
Geophysical Methods ◽  
Internal Flow ◽  
Sao Paulo ◽  
São Paulo ◽  
Earth Dams ◽  
S Wave ◽  
Multichannel Analysis ◽  
Refraction Seismic ◽  
Non Destructive

ABSTRACT. The application of non-destructive methods of investigation in dams, such as refractive seismic method and Multichannel  Analysis of Surface Waves (MASW) are increasingly effective from the point of choosing the best dam site, as well as in the phases of  construction and maintenance of the structure. The objective of the research was to apply geophysical methods in the structure of the dam  to detect the internal flow of fluids, the presence of voids, find possible fracture zones and variations in the level of saturation of the massif,  characteristics related to permeability and directly linked to the stability of the dam. In this way, geophysical methods have proved to be  excellent tools, because, unlike instrumentation traditionally used in this type of monitoring, such as piezometers and water level indicators,  they can cover a large study area quickly.  This paper aims to present the results of the correlation between the MASW method and the S-wave seismic refraction method in two small earth dams in the countryside of the State of São Paulo, Brazil, more precisely in the  cities of Cordeirópolis and Ipeúna. The main goal was to obtain the depths of the rocky top and the saturated/unsaturated zone of the earth dams using seismic tests under conditions of lack of information about the construction of the dam. The application of geophysical methods  in dams that do not previously have important information (presence of drainage blanket, vertical/horizontal filters, for example) proves to  be a very interesting non-destructive investigation technique.Keywords: geophysics in dams, MASW, seismic refraction, dam investigation. INVESTIGAÇÃO NÃO-DESTRUTIVA EM BARRAGENS DE TERRA DE PEQUENO PORTE USANDO MÉTODOS GEOFÍSICOS: ANÁLISE MULTICANAL DE ONDAS SUPERFICIAIS (MASW) E SÍSMICA DE REFRAÇÃO TOMOGRÁFICARESUMO. A aplicação de métodos não destrutivos de investigação em barragens, como o método da sísmica de refração e a análise  multicanal de ondas de superfície (MASW), são cada vez mais eficazes desde a fase de escolha do melhor local para a instalação da  barragem, bem como nas fases da construção e manutenção da estrutura. O objetivo da pesquisa foi aplicar métodos geofísicos na  estrutura da barragem para detectar o fluxo interno de fluidos, a presença de vazios, encontrar possíveis zonas de fratura e variações no  nível de saturação do maciço, características relacionadas à permeabilidade e diretamente ligadas à estabilidade da barragem. Desta forma, os métodos geofísicos se mostraram como excelentes ferramentas, pois puderam cobrir uma grande área de estudo com rapidez, diferentemente da tradicional instrumentação utilizada neste tipo de monitoramento, como piezômetros e indicadores do nível d'água.  Este trabalho tem como objetivo apresentar os resultados da correlação entre o método  MASW e o método sísmico de refração  com ondas S em duas pequenas barragens de terra no interior do Estado de São Paulo, mais precisamente nas cidades de Cordeirópolis  e Ipeúna. O objetivo principal foi o de obter as profundidades do topo rochoso e da zona saturada/insaturada das barragens de terra  fazendo uso de ensaios sísmicos em condições de ausência de informações a respeito da construção do barramento. A aplicação de  métodos  geofísicos  em  barragens  que  não  possuem  previamente  informações  importantes  (presença  de  tapete  drenante,  filtros  verticais/horizontais, por exemplo) mostra-se como uma técnica de investigação não destrutiva bastante interessante.Palavras-chave: geofísica em barragens, MASW, sísmica de refração, investigação em barragens.

scholarly journals Marine geophysical investigations offshore East Greenland

1983 ◽  
Vol 115 ◽  
pp. 93-100
Author(s):  
H.C Larsen
Keyword(s):  
Seismic Data ◽  
Seismic Refraction ◽  
Magnetic Data ◽  
Seismic Profiles ◽  
East Greenland ◽  
Gravity And Magnetic ◽  
Marine Gravity ◽  
Refraction Seismic ◽  
Regional Project ◽  
Gravity And Magnetic Data

During August and September 1982 a marine geophysical survey was conducted on the East Greenland Shelf. The survey was part of the ongoing regional project NAD (Larsen & Andersen, 1982; Andersen et al., 1981; Risum, 1980; Larsen & Thorning, 1980). In all 2794 km of 30-fold multi-channel seismic data and marine gravity and magnetic data were acquired (fig. 33). The object of the NAD programme is to acquire regional coverage of aeromagnetic, multichannel seismic refiection, seismic refraction (sonobuoy), marine gravity and magnetic data of the East Greenland Shelf between latitudes 60° N and 78°N. Aeromagnetic data comprising 63000 line kilometres were acquired in 1979 (Larsen & Thorning, 1980) and 5000 km of marine geophysical data were acquired in 1980 and 1981 (Larsen & Andersen, 1982; Andersen et al., 1981). This year the final data for the project were collected. Thus, a total of 7800 km of multi-channel refiection seismic data and 50 sonobuoy refraction seismic profiles of 20 to 70 km length have been acquired (fig. 33). In addition, marine gravity and magnetics were run at most lines.

scholarly journals A comparison of seismic and radar methods to establish the thickness and density of glacier snow cover

2013 ◽  
Vol 54 (64) ◽  
pp. 73-82 ◽  
Author(s):  
Adam D. Booth ◽  
Andrew Mercer ◽  
Roger Clark ◽  
Tavi Murray ◽  
Peter Jansson ◽  
...  
Keyword(s):  
Lower Layer ◽  
Effective Means ◽  
Seismic Refraction ◽  
Geophysical Methods ◽  
Ground Truth ◽  
Snow Layer ◽  
Refraction Seismic ◽  
Geophysical Surveys ◽  
Glacier Ice ◽  
Snow Thickness

AbstractWe show that geophysical methods offer an effective means of quantifying snow thickness and density. Opportunistic (efficient but non-optimized) seismic refraction and ground-penetrating radar (GPR) surveys were performed on Storglaciären, Sweden, co-located with a snow pit that shows the snowpack to be 1.73 m thick, with density increasing from ∼120 to ∼500 kg m–3(with a +50 kg m–3anomaly between 0.73 and 0.83 m depth). Depths estimated for two detectable GPR reflectors, 0.76 ±0.02 and 1.71 ± 0.03 m, correlate extremely well with ground-truth observations. Refraction seismic predicts an interface at 1.90 ± 0.31 m depth, with a refraction velocity (3730 ± 190 ms–1) indicative of underlying glacier ice. For density estimates, several standard velocity-density relationships are trialled. In the best case, GPR delivers an excellent density estimate for the upper snow layer (observed = 321 ± 74 kg m–3, estimated = 319 ± 10 kgm–3) but overestimates the density of the lower layer by 20%. Refraction seismic delivers a bulk density of 404 ±22 kgm–3compared with a ground-truth average of 356 ± 22 kg m–3. We suggest that geophysical surveys are an effective complement to mass-balance measurements (particularly for controlling estimates of snow thickness between pits) but should always be validated against ground-truth observations.

scholarly journals Identification of Landfill Using Refraction Seismic Method in LIPI Area - Bandung

2020 ◽  
Vol 5 (1) ◽  
pp. 26-37
Author(s):  
Resi Wasilatus Syifa ◽  
Nur Ichsan Sumardani ◽  
Nur Amalia Dewi ◽  
Teti Febrianti ◽  
Jauhari Arifin ◽  
...  
Keyword(s):  
Wave Velocity ◽  
Subsurface Layer ◽  
Seismic Refraction ◽  
Thick Layer ◽  
Data Interpretation ◽  
P Wave ◽  
P Wave Velocity ◽  
Refraction Seismic ◽  
Soil Deposits ◽  
Soil Structures

Research has been carried out using seismic refraction in the LIPI area - Bandung, which aims to determine the land of embankment in the area. Retrieval of field data was carried out using geometric  Es-3000 tool along 46 meters with a spacing of 2 meters and a 7 shoot punch consisting of 2 phantom shoots beginning and ending. Data processing is done by the first step, namely by geometric editing so that data can be read by the computer. The inversion process is done by seismimager software which consists of pickwin to extract data and plotera for modeling the subsurface layer. The results of the data interpretation show the P wave velocity from 315 - 435 m / s. layer grouping based on P wave velocity is at the first color layer having a wave velocity of about 315 - 342 m / s, the second color layer has a wave speed of 355-382 m / s, and the third color layer has a speed of 359 - 422 m / s and thick layer more than 435. Based on the lithological classification of subsurface rock layers, this study area tends to have a layer of soil type with a depth of 5 meters, and can be said to be a layer of soil deposits because of the formation of soil structures that tend to be new

The Carribuddy Group and Worral Formation, Canning Basin, Western Australia: reassessment of stratigraphy and petroleum potential

2010 ◽  
Vol 50 (1) ◽  
pp. 425 ◽  
Author(s):  
Peter Haines
Keyword(s):  
Middle Devonian ◽  
Late Ordovician ◽  
Source Rocks ◽  
Local Source ◽  
Petroleum Potential ◽  
Canning Basin ◽  
Petroleum Wells ◽  
Reservoir Potential ◽  
Drill Holes ◽  
Reservoir Facies

Reassessment of stratigraphic relationships and biostratigraphic data pertaining to the Carribuddy Group and Worral Formation in all relevant petroleum wells and many mineral drill holes across the southern Canning Basin has led to the following important results. The Carribuddy Group is restricted to the Late Ordovician to earliest Silurian. The overlying Worral Formation is mostly of Silurian age and does not intertongue with the Middle Devonian Tandalgoo Formation, as previously thought. A thin basin-wide chronostratigraphic marker—the Pegasus Dolomite Member (previously referred to as dolomite spike or dolomite marker) of the Sahara Formation—allows improved correlation between salt-bearing sub-basins and adjacent condensed Carribuddy Group successions. The Mallowa Salt is not as extensive as previously thought; rather the Minjoo Salt thickens to become the only salt seal in the eastern and southern Kidson Sub-basin. The Carribuddy Group forms the regional seal to the prospective Larapintine 2 petroleum system, but also contains local source and reservoir facies. The Bongabinni Formation contains extremely rich oil-prone source rocks in local lagoonal facies along the Admiral Bay Fault Zone; these rocks have been linked by other studies to migrated oil in that area. The distribution of the source facies is poorly known, but it may extend down-dip into more mature parts of the Willara Sub-basin, and west into offshore areas. Other local source units may be present in the Mallowa Salt, and possibly the Nibil Formation, but are not well documented. Aeolian sandstone with excellent reservoir potential is locally present in the Nibil Formation, but is more extensive in the lower Worral Formation, particularly the Elsa Sandstone Member.

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