scholarly journals Oblique reactivation of inherited fabrics in rift basins: applications to the Northern Carnarvon Basin

2015 ◽  
Vol 2015 (1) ◽  
pp. 1-2
Author(s):  
Chris Elders
Keyword(s):  
Rift Basins ◽  
Northern Carnarvon Basin ◽  
Carnarvon Basin

Mesozoic rift onset and its impact on the sequence stratigraphic architecture of the Northern Carnarvon Basin

2016 ◽  
Vol 56 (1) ◽  
pp. 143 ◽  
Author(s):  
Anthony Gartrell ◽  
Jose Torres ◽  
Matt Dixon ◽  
Myra Keep
Keyword(s):  
Marked Change ◽  
Middle Part ◽  
Late Triassic ◽  
Normal Faults ◽  
Rift Basins ◽  
Tectonic Event ◽  
Growth Strata ◽  
Stratigraphic Architecture ◽  
Northern Carnarvon Basin ◽  
Carnarvon Basin

Ages varying from Late Triassic to Early Jurassic have been proposed by different authors for the onset of rifting in the Northern Carnarvon Basin. Seismic sections from the Exmouth Sub-basin and outer Exmouth Plateau demonstrate significant growth strata associated with displacement on normal faults starting at least at the base of the R. rhaetica zone (Rhaetian). This tectonic event coincides with a marked change in sequence architecture and a large landward shift (~300 km) of the paleo-shoreline to the vicinity of the Rankin and Alpha Arch trends. Rapid creation of accommodation in the inboard narrow rift basins (Exmouth, Barrow and Dampier sub-basins) is suggested to be the most likely cause of this major transgression. The preferential development of associated carbonate build-ups during the Rhaetian on the footwall side of active tilted fault blocks provides additional evidence for the onset of significant extensional faulting occurring during this time. An earlier more subtle initiation phase of rifting, however, is interpreted during the Norian, from around the middle part of the H. balmei biozone time, above which a change in stratigraphic architecture from aggrading to retrograding occurs. The observed structural and stratigraphic transitions can be related to typical phases of evolution described in many rift basins around the world. The work highlights the importance of integrating regional structural geology, sequence stratigraphy and depositional systems observations to provide robust constraints for basin evolutions.

The paleogeography of the Beagle Sub-basin, northern Carnarvon Basin, Australia

1998 ◽  
Vol 68 (6) ◽  
pp. 1131-1145
Author(s):  
A. E. Stephenson ◽  
J. E. Blevin ◽  
B. G. West
Keyword(s):  
Northern Carnarvon Basin ◽  
Carnarvon Basin

POST-RIFT TECTONIC SUBSIDENCE AND PALAEO-WATER DEPTHS IN THE NORTHERN CARNARVON BASIN, WESTERN AUSTRALIA

2001 ◽  
Vol 41 (1) ◽  
pp. 367 ◽  
Author(s):  
A.R. Kaiko ◽  
A.M. Tait
Keyword(s):  
Vitrinite Reflectance ◽  
Tectonic Subsidence ◽  
Hydrocarbon Generation ◽  
Basin Inversion ◽  
Sedimentary Architecture ◽  
History Of ◽  
Northern Carnarvon Basin ◽  
Migration Pathways ◽  
Water Depths ◽  
Carnarvon Basin

The subsidence history of the Northern Carnarvon Basin has been dominated by simple thermal sag following the creation of the Exmouth, Barrow and Dampier Sub-basins by Early to Middle Jurassic rifting. This conclusion follows from the recognition of vitrinite reflectance suppression, which removes the need for recent heating events, and from the use of seismic stratigraphy, rather than only palynology and micro-palaeontology, to determine palaeo-water depths.The simple thermal-sag model, related to Jurassic rifting, accounts for the post-rift sedimentary architecture of the Northern Carnarvon Basin, especially in areas of sediment starvation. It also has implications for the timing of hydrocarbon generation and the reconstruction of migration pathways. This work has re-emphasised the theoretical possibility of determining palaeo-water depths by adjusting one-dimensional basin models to fit simple thermal sag tectonic subsidence curves.Miocene uplift, in the order of several hundred metres, has caused local basin inversion, accentuated some preexisting structures and re-activated some faults causing hydrocarbon remigration, but has otherwise not affected the thermal history of the sediments.

THE INFLUENCE OF COMPOSITION, DIAGENESIS AND COMPACTION ON SEAL CAPACITY IN THE MUDERONG SHALE, CARNARVON BASIN

2004 ◽  
Vol 44 (1) ◽  
pp. 201 ◽  
Author(s):  
G.E. Kovack ◽  
D.N. Dewhurst ◽  
M.D. Raven ◽  
J.G. Kaldi
Keyword(s):  
Effective Stress ◽  
Pore Geometry ◽  
Burial Depth ◽  
Threshold Pressure ◽  
Direct Influence ◽  
Different Depths ◽  
Northern Carnarvon Basin ◽  
Vertical Effective Stress ◽  
Mercury Injection Capillary Pressure ◽  
Carnarvon Basin

The Muderong Shale blankets most of the northern Carnarvon Basin and is the top seal to over 90% of all commercial discoveries. This study examines the influence that vertical effective stress, mineralogy and diagenesis have on regional variations of seal capacity. Throughout the basin, threshold pressures (determined from Mercury Injection Capillary Pressure (MICP) analyses), range from less than 1,000 psi (equivalent to ~100 m gas column) up to 10,000 psi (~1,000 m gas column). Because the Muderong Shale varies in thickness (5 m to >900 m) and burial depth (~0.5–3.5 km), effective stresses and temperatures also vary. Effective stress and temperature significantly control pore geometry at different depths through compaction and diagenesis. The data from this study show that shale grain size has no direct influence over seal threshold pressure except that finer-grained Muderong Shale (36–45% particles 2.5 km) along the Northern Alpha Arch and Rankin Platform, total illite content is only moderate.

A REVIEW OF THE HYDROCARBON HABITAT OF THE EASTERN AND CENTRAL BARROW — DAMPIER SUB-BASIN, WESTERN AUSTRALIA

1985 ◽  
Vol 25 (1) ◽  
pp. 154 ◽  
Author(s):  
E. Kopsen ◽  
G. McGann
Keyword(s):  
Coarse Grained ◽  
Hydrocarbon Source Rock ◽  
Mixed Composition ◽  
Fine Grained ◽  
Third Phase ◽  
Dynamic Charging ◽  
Rich Liquid ◽  
Northern Carnarvon Basin ◽  
And Migration ◽  
Carnarvon Basin

The most completely known section of the Barrow- Dampier Sub-basin in the northern Carnarvon Basin of the Northwest Shelf comprises three depositional super- cycles spanning the Triassic to the Tertiary. Each cycle is made up of an initial transgressive section of mainly fine-grained clastics overlain by a thick, extensive, off- lapping sequence of coarse-grained deposits. The transgressive sedimentary package typically contains a coarse basal unit overlain by a thick, argillaceous unit, whereas the progradational package changes character in each cycle, representing increasingly open marine conditions as the depocentre and its palaeogeography evolved. Continental siliciciastics at the end of the Triassic Supercycle contrast with the marine-marginal marine siliciciastics at the end of the Jurassic-Neocomian Supercycle and the prograding Tertiary carbonate wedge of the youngest cycle. Each of these gross sequences has a distinctive seismic signature upon which are superimposed stratigraphic features reflecting basin evolution from a broad intra-continental depocentre to a mature, passive continental margin basin.In the area east of Barrow Island, potential hydrocarbon source rock quality and richness varies between each cycle but potential source beds frequently occur at similar levels within each supercycle. The Dingo Claystone within the Jurassic-Neocomian depositional package contains by far the thickest and most extensive potential sources in the area and is likely to be the source for most of the hydrocarbon liquids discovered to date in the northern Carnarvon Basin (with the probable exclusion of the majority of the Rankin Platform condensates).The occurrence of oils of mixed composition and considerable variability beneath the Muderong Shale regional seal in areas of low thermal maturity suggests that many of the hydrocarbon liquids have undergone considerable vertical migration and have also a complex genesis. Furthermore, saturate-rich liquid hydrocarbons overprinting an older biodegraded oil are recognised in a number of wells along the basin margin hingeline. The likely migration and entrapment model for the majority of hydrocarbons discovered to date in the area under review involves dynamic charging of reservoirs, mainly during the Tertiary. Two main pulses of generation and migration are recognised in the eastern portion of the sub -basin, and a third phase is probably occuring at present-day, west of Barrow Island.

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