BAYU/UNDAN GAS-CONDENSATE DISCOVERY: WESTERN TIMOR GAP ZONE OF COOPERATION, AREA A.

1996 ◽  
Vol 36 (1) ◽  
pp. 142 ◽  
Author(s):  
D. M. Brooks ◽  
A. K. Goody ◽  
J. B. O'Reilly ◽  
K. L. McCarty
Keyword(s):  
Joint Venture ◽  
Gas Condensate ◽  
Normal Faults ◽  
Structural Element ◽  
Water Contact ◽  
The North ◽  
Wet Gas ◽  
Petroleum Company ◽  
North And South ◽  
East West

The Bayu/Undan Gas-Condensate Field straddles the boundary between the ZOCA 91-12 and ZOCA 91-13 PSC areas, within the Timor Gap Zone of Cooperation Area A (ZOCA). The field is located approximately 450 km north­west of Darwin, NT, and 350 km east-southeast of Kupang, Timor. The closure is the culmination of the Flamingo High, a major structural element within the northern Bonaparte Basin. This structure has been viewed as having significant hydrocarbon potential since Flamingo-1 recovered gas from Berriasian sandstones in 1971.The discovery well, Bayu-1, was drilled by the ZOCA 91-13 contract operator, Phillips Petroleum Company ZOC, in early 1995. Bayu-1 intersected a gross 155m gas-condensate column within Middle Jurassic sandstones at a depth of 2,954.5 mSS. The ZOCA 91-12 joint venture then drilled Undan-1,10 km northwest of Bayu-1, on a separate culmination within the closure defined by the Bayu-1 gas-water contact. Undan-1 and subsequent wells have confirmed the existence of one large gas-conden­sate field, with a most likely areal extent of over 160 km2.The sandstone reservoir consists of late Oxfordian to Callovian shallow marine, deltaic to shoreface, coarsen­ing upward parasequences, overlying Callovian to Bajocian marginal marine to coastal plain sediments. The trap is an east-west oriented horst block bounded by en-echelon normal faults to the north and south, with dip closure to the east and west. Seal is provided by Tithonian to Barremian marine claystones. A likely hydrocarbon source is contained within the Barremian to Callovian interval, some of which are mature for condensate and wet gas expulsion in the southern Sahul Syncline and Malita Graben.

THE ELANG OIL DISCOVERY ESTABLISHES NEW OIL PROVINCE IN THE EASTERN TIMOR SEA (TIMOR GAP ZONE OF COOPERATION)

1995 ◽  
Vol 35 (1) ◽  
pp. 44
Author(s):  
I. F. Young ◽  
T.M. Schmedje ◽  
W.F. Muir
Keyword(s):  
Seismic Data ◽  
Late Jurassic ◽  
Joint Venture ◽  
Seismic Survey ◽  
Normal Faults ◽  
Commercial Development ◽  
The North ◽  
3D Data ◽  
Porosity And Permeability ◽  
Timor Sea

The Elang-1 oil discovery in the Timor Gap Zone of Cooperation (ZOC) has established a new oil province in the eastern Timor Sea. The discovery well, completed in February 1994, recorded a flow of 5,800 BOPD (5,013 STBOPD) from marine sandstone of the Late Jurassic Montara beds. The oil is a light (56° API), undersaturated oil with a GOR of approximately 550 SCF/STB. Elang-1 was the first well drilled by the ZOCA 91-12 Joint Venture and only the fifth well in the ZOC since exploration of this frontier area resumed in 1992.The Elang Prospect, initially mapped by Petroz in the late 1970s on the basis of regional seismic data, was detailed by the 1992 Walet Seismic Survey. The prospect is the main crestal culmination on the Elang Trend, a prominent structural high to the north of the Flamingo High that was established during continental break-up in the Late Jurassic. The Elang Trend is bounded to the south by a series of en-echelon normal faults and connecting relay ramps and comprises a number of horst and tilted fault blocks.Elang-1 tested a near crestal culmination on the Elang Prospect and intersected a 76.5 m gross oil column below 3,006.5 m RT. At time of drilling this oil column was the thickest that had been encountered by any well in the Northern Bonaparte Basin. Good quality reservoir sandstone in six discrete bodies were intersected within the Montara beds. Core-measured porosity and permeability range up to 17 per cent and 2.2 Darcies within the oil column.Subsequent to the Elang discovery, the Joint Venture recorded a 402 km2 3D survey over the Elang Trend. Elang-2, an appraisal well spudded in September 1994 prior to receipt of the 3D data, established the lateral continuity of the Montara beds reservoirs. Flow rates of 6,080 BOPD (5,300 STBOPD) and 7,500 BOPD (5,970 STBOPD) from separate intervals have confirmed that high deliverabilities can be expected from individual sandstones. Further appraisal drilling is planned in the first half of 1995. This is expected to lead to commercial development of the field.

Recherches geologiques preliminaires dans le massif du Parnasse (Grece)

1957 ◽  
Vol S6-VII (4-5) ◽  
pp. 571-583 ◽  
Author(s):  
Paul Celet
Keyword(s):  
Upper Triassic ◽  
Stratigraphic Sequence ◽  
The North ◽  
North And South ◽  
East West

Abstract The stratigraphic sequence of the Parnassus massif in Greece begins with coral-bearing upper Triassic dolomites and limestones, which are overlain by a thick series of Mesozoic limestones capped by red shaly marls and sandy Flysch formations. The structure was influenced by the rigidity of the limestone cover, which is faulted and overthrust in slices toward the east-northeast. The massif as a whole is cut by deep east-west-trending faults, along which the large grabens bounding the massif on the north and south were downdropped.

scholarly journals Global variations of local asymmetry in glacier altitude: separation of north–south and east–west components

2005 ◽  
Vol 51 (174) ◽  
pp. 469-482 ◽  
Author(s):  
Ian S. Evans ◽  
Nicholas J. Cox
Keyword(s):  
The Arctic ◽  
Equilibrium Line Altitude ◽  
Height Range ◽  
The North ◽  
Regional Trends ◽  
Strong Winds ◽  
The Tropics ◽  
New Evidence ◽  
North And South ◽  
East West

AbstractNorth–south and east–west differences in firn-line altitude, equilibrium-line altitude or middle altitudes of glaciers can be separated by regression on the cosine and sine of glacier aspect (accumulation area azimuth). Allowing for regional trends in altitude, the north–south differences expected from radiation and shade effects can be reliably quantified from World Glacier Inventory (WGI) data. The north–south differences are greater in sunnier climates, mid-latitudes and steeper relief. Local altitude differences between north- and south-facing glaciers are commonly 70–320 m. Such asymmetry is near-universal, although weak in the Arctic and tropics. East–west contrasts are less, and found mainly in the tropics and areas most exposed to strong winds. Altitude, latitude, glacier gradient and height range, calculable from most of the WGI data, are potential controls on the degree of north–south contrast, as well as surrogates for climatic controls (temperature, precipitation, radiation and cloudiness). An asymmetric sine–cosine power model is developed to describe the variation of north–south contrast with latitude. Multiple regression over 51 regions shows altitude and latitude to be the strongest controls of this contrast. Aspect–altitude analysis for former glaciers provides new evidence of cloudiness.

Electronic Consortium of Libraries: A Bibliographical Cooperation Scheme

2005 ◽  
Vol 17 (2) ◽  
pp. 105-112
Author(s):  
Célia Ribeiro Zaher ◽  
Angela Bettencourt
Keyword(s):  
Cultural Awareness ◽  
Joint Venture ◽  
National Level ◽  
Internet Access ◽  
Brazilian Literature ◽  
Cultural Aspects ◽  
The North ◽  
Outreach Programme ◽  
Use Of The Internet ◽  
North And South

In 1982 a Brazilian joint venture of cooperative automated cataloging at national level started, which developed in the 1990s with the greater use of the Internet and changes of format and software to provide Internet access to online catalogues. In consequence, major changes were made from 1997 on to operate with new software entirely online, with full Internet access for remote users and an Intranet for cataloguing from 80 workstations. The launching, in 1998, of a website with one million records, including the current National Bibliography, linked to images and sounds, legal deposit records and ISBN registration, as well as full text classical Brazilian literature, has created an impact on users. In 1999 registers of copyright records were also made available on the web, and today encompass 200,000 items. An Electronic Consortium of Libraries was created in 1998 which caters to users and also deals with libraries individually through its outreach programme. The sophisticated system of copy cataloguing permits libraries which become members of the Consortium to download full bibliographical records and multimedia, free of charge, from the National Bibliography. The online cataloguing software has built-in automated Portuguese translation offering cataloguers at their workstation access to official translated terms of subject headings used by the Library of Congress. Several thematic sites have been developed to cater to cultural awareness, targeting social, economic and cultural aspects of the different history and life of all states in Brazil, showing the cultural diversity of the North and South of the country.

Subduction of an extinct rift and its role in the formation of submarine landslides in NW South America

2020 ◽  
Vol 500 (1) ◽  
pp. 311-322 ◽  
Author(s):  
Carlos A. Vargas ◽  
Gustavo A. Gutiérrez ◽  
Gustavo A. Sarmiento
Keyword(s):  
South America ◽  
Seismic Activity ◽  
Fault Reactivation ◽  
Submarine Landslides ◽  
Oceanic Plate ◽  
Sources Of Uncertainty ◽  
The North ◽  
Continental Plate ◽  
North And South ◽  
East West

AbstractOn the eastern margin of the Panama Basin, the Nazca oceanic plate converges towards the continental plate of South America at approximately 53 mm a−1. Subduction processes are accompanied by the presence of anomalous bathymetric elements including the Sandra Ridge. This east–west-orientated ridge is catalogued as an aborted rift derived from a magmatic spreading axis that was active between 12 and 9 Ma. Seismic activity within this structure is considered evidence of fault reactivation and tectonism. Once the structure reached the subduction trench several submarine landslides were triggered. Run-out lengths of these submarine landslides are perpendicular to the convergence of the structure with some units spreading and forming a wide fan that reaches tens of kilometres to the north and south of the trench. The area affected by the three main landslides varies between 130 and 300 km2 approximately, with relatively superficial earthquakes (<33 km) and with magnitudes that reach up to Mw 7.2. The morphology of the landslides suggests a retrogressive nature with younger events proximal to shore. This paper presents estimates of the age of these landslides and discusses sources of uncertainty regarding these times of occurrence.

Multiple Deformation in Archean Rocks of the Vermilion District, Northeastern Minnesota

1971 ◽  
Vol 8 (4) ◽  
pp. 423-434 ◽  
Author(s):  
P. R. Hooper ◽  
R. W. Ojakangas
Keyword(s):  
Iron Formation ◽  
Rock Outcrop ◽  
Kink Bands ◽  
Precambrian Rocks ◽  
The North ◽  
Multiple Deformation ◽  
North And South ◽  
East West

The structure of the Precambrian rocks of the Vermilion district is critically examined. It is demonstrated that two significant deformations (F1 and F2) have affected the area in addition to a later set of faults, joints, and kink-bands (F3). The F1 folds are tight to isoclinal with gently plunging axes and vertical axial planes trending west–northwest and containing iron formation and greenstones in anticlinal cores. The second deformation forms a series of open to close asymmetric folds (F2) with steep axes and vertical axial planes trending east–west. Of these, F1 has the more significant effect on the pattern of rock outcrop and it is suggested that it is directly related to the diapiric rise of the batholiths lying immediately to the north and south. The F2 folds may be accounted for by further compression between the two granite bodies.

Geology of the Gladys McCall Geopressured-Geothermal Prospect, Cameron Parish, Louisiana

1988 ◽  
Vol 110 (4) ◽  
pp. 255-261
Author(s):  
Chacko J. John
Keyword(s):  
Research Program ◽  
Department Of Energy ◽  
Well Control ◽  
Wildlife Refuge ◽  
Stratigraphic Section ◽  
Deep Well ◽  
The North ◽  
Lake Charles ◽  
North And South ◽  
East West

The Gladys McCall prospect lies at the western edge of the Rockefeller Wildlife Refuge about 88 km (55 mi) southeast of Lake Charles in Cameron Parish, Louisiana. The test well is 4825 m (15,831 ft) deep and was drilled in 1981 under the U. S. Department of Energy geopressured-geothermal research program. The well was shut in at the end of October 1987 after it had produced over 27 million barrels of brine and 676 MMscf gas, without any significant pressure decline. The stratigraphic section seen in this test well consists of alternating sandstones and shales with about 350 m (1150 ft) of net sand between 4393 m (14,412 ft) and 4974 m (16,320 ft). The producing reservoir is bounded on the north and south by faults. The east-west dimension is poorly defined due to lack of deep well control. Eleven prospective production zones have been identified. The pressure maintenance and the continuous high brine yield from the reservoir may be due to laterally overlapping and connected sandstones, communication between overlying and/or underlying reservoirs, growth faults acting as passageways for brine, shale dewatering, or possible communication of zones behind the casing.

The Early Carboniferous Magerøy dykes, northern Norway: palaeomagnetism and palaeogeography

2003 ◽  
Vol 140 (4) ◽  
pp. 443-451 ◽  
Author(s):  
R. J. ROBERTS ◽  
T. H. TORSVIK ◽  
T. B. ANDERSEN ◽  
E. F. REHNSTRÖM
Keyword(s):  
Barents Sea ◽  
Sedimentary Facies ◽  
Early Carboniferous ◽  
Normal Faults ◽  
Northern Norway ◽  
The North ◽  
The Barents Sea ◽  
Palaeomagnetic Data ◽  
Magnetic Signature ◽  
North And South

Palaeomagnetic data from the 337 Ma Magerøy dykes (northern Norway) are of exceptionally high quality, and a positive contact test along with an existing regional result from the Silurian Honningsvåg Igneous Suite attests to a primary Early Carboniferous magnetic signature. The palaeomagnetic pole (S14.8°, E320.1°, dp/dm=4.4/8.6°) is the first Early Carboniferous pole from Baltica, and implies that northernmost Norway–Greenland, the Barents Sea and Svalbard were located at tropical to low northerly latitudes at this time. Northward drift during Carboniferous times (5–6 cm/yr) as demonstrated from palaeomagnetic data is also reflected in the sedimentary facies in the Barents Sea realm, that is, a change from tropical (Early Carboniferous) to subtropical (20–30° N) carbonates and evaporites in the Late Carboniferous. The Magerøy dykes are continental tholeiites which intruded into a set of NW–SE-trending normal faults parallel to the Trollfjorden–Komagelva Fault Zone and the Magerøysundet Fault immediately to the north and south of Magerøya, respectively. These, and many other NW–SE-trending faults (onshore and offshore), were active during Late Palaeozoic extension, and the dykes were probably contemporaneous with the earliest syn-rift sedimentation in the Barents Sea (for example, the Nordkapp Basin).

The Central Brae Field, Blocks 16/07a, 16/07b, UK North Sea

2003 ◽  
Vol 20 (1) ◽  
pp. 183-190 ◽  
Author(s):  
Keith J. Fletcher
Keyword(s):  
Upper Jurassic ◽  
Western Boundary ◽  
The South ◽  
Submarine Fan ◽  
Water Contact ◽  
The North ◽  
Oil Water ◽  
Clay Formation ◽  
A Minor ◽  
North And South

abstractThe Central Brae Oilfield is the smallest of three Upper Jurassic fields being developed in UK, Block 16/07a. The field was discovered in 1976 and commended production in September 1989 through a sub-sea template tied back to the Brae 'A' platform in the South Brae Oilfield. The field Stooip is 244 MMBBLs, and by May 1999 cumulative exports of oil and NGL reached 44 MMBBLs.The Central Brae reservoir is a proximal submarine fan sequence, comprising dominantly sand-matrix conglomerate and sanstone with a minor mudstone units. The sediments were shed eastwards off the Fladen Ground Spur and were deposited as a relatively small and steep fan at the margin of the South Viking Graben. Mudstone facies border the submarine fan deposits to the north and south, forming stratigraphic seals. The structure is a faulted anticline developed during the latest Jurassic and early Cretaceous, initially formed as a hangingwall anticline during extension but subsequently tightened during compressional phases. The western boundary of the field is formed by a sealing fault, whilst to the east, there is an oil-water contact at 13426 ft TVDss. The overlying seal is the Kimmeridge Clay Formation, which also interdigitates with the coarser facies basinwards and provides the source of the hydrocarbons.

The August 1975 Oroville earthquakes

1976 ◽  
Vol 66 (4) ◽  
pp. 1085-1099
Author(s):  
K. M. Lahr ◽  
J. C. Lahr ◽  
A.G. Lindh ◽  
C. G. Bufe ◽  
F. W. Lester
Keyword(s):  
Fault Plane ◽  
Aftershock Sequence ◽  
The West ◽  
Epicentral Area ◽  
Space And Time ◽  
The North ◽  
The Town ◽  
North And South ◽  
East West

abstract On August 1, 1975, a magnitude 5.9 (mb) earthquake occurred approximately 8 km SSE of the town of Oroville, California. This earthquake and its associated foreshock-aftershock sequence are of particular interest because of their possible relation to the impounding of the 4.3 billion m3 Lake Oroville. Hypocenter locations for 336 aftershocks that occurred during August define a fault plane striking N3°E and dipping 60° to the west to a depth of 10 km. Dimensions of the epicentral area are approximately 7 km in an east-west direction by 15 km in a north-south direction. The fault plane passes beneath Oroville Dam at 5-km depth, and if projected up dip, would crop out beneath the reservoir to the east. The distribution in space and time of foreshocks and aftershocks suggests that rupture began at depth and progressed up dip and to the north and south.

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