scholarly journals Outer Rocky Shores of the Mowanbini Archipelago, Devonian Reef Complex, Canning Basin, Western Australia

2007 ◽  
Vol 115 (5) ◽  
pp. 583-600 ◽  
Author(s):  
Markes E. Johnson ◽  
Gregory E. Webb
Keyword(s):  
Western Australia ◽  
Rocky Shores ◽  
Reef Complex ◽  
Canning Basin

THE GEOLOGY AND HYDROCARBON POTENTIAL OF THE EP 104 PERMIT, NORTHWEST CANNING BASIN, WESTERN AUSTRALIA

1986 ◽  
Vol 26 (1) ◽  
pp. 261
Author(s):  
P.R. Lehmann
Keyword(s):  
Western Australia ◽  
Early Carboniferous ◽  
Hydrocarbon Reservoirs ◽  
Hydrocarbon Potential ◽  
Considerable Potential ◽  
Reef Complex ◽  
Canning Basin ◽  
Large Potential ◽  
Exploration Well

Current interpretations suggest the presence of five Devonian reef building cycles in EP 104 with a further two in the Ordovician, Nita, and Willara formations. The possible Devonian reefs occur in the NVorral, Lower and Upper Pillara, Virgin Hills, and Nullara carbonate cycles. Minor buildups may be present in the Fairfield and Laurel formations.The Upper Pillara reef complex was subaerially exposed and partly eroded for a period of 10 to 50 million years, following the Early Frasnian 'Tappers Inlet orogeny'. Large potential hydrocarbon reservoirs were created by the secondary mega-porosity formed during this period, and these were sealed by the regional Laurel transgression in the Early Carboniferous. This mode of porosity enhancement is applicable to all the potential reef cycles, as varying degrees of unconformity mark their upper boundaries, generally followed by onlap of sealing lithologies. The Upper Pillara cycle is considered the most prospective of the Devonian carbonate cycles which were the main targets in the first five wells.In response to the success of Home Energy Co. Ltd at Sundown, the last four wells in EP 104 have had Permo-Carboniferous objectives. This drilling resulted in the discovery in 1982 of the small Kora oilfield, believed to have been sourced from the Laurel Formation.The Black Rocks Prospect, in King Sound, is being considered for the first 1986 exploration well. This represents a return to Devonian Pillara reefs, the traditional primary targets in EP 104. As a bonus, drape, accentuated by late collapse of the reefal core, has localized multiple Permo-Carboniferous structural closures, coincident with reefal closure.By comparison with the highly productive Swan Hills and Rainbow-Keg River reefs in Canada the Pillara and Worral carbonate cycles in EP 104 must have considerable potential.

Persistence of giants: population dynamics of the limpet Scutellastra laticostata on rocky shores in Western Australia

2020 ◽  
Vol 646 ◽  
pp. 79-92
Author(s):  
RE Scheibling ◽  
R Black
Keyword(s):  
Population Dynamics ◽  
Western Australia ◽  
Size Structure ◽  
Survival Rates ◽  
Maximum Size ◽  
High Rate ◽  
Adult Survival ◽  
Rocky Shores ◽  
Adult Size ◽  
Decadal Time Scale

Population dynamics and life history traits of the ‘giant’ limpet Scutellastra laticostata on intertidal limestone platforms at Rottnest Island, Western Australia, were recorded by interannual (January/February) monitoring of limpet density and size structure, and relocation of marked individuals, at 3 locations over periods of 13-16 yr between 1993 and 2020. Limpet densities ranged from 4 to 9 ind. m-2 on wave-swept seaward margins of platforms at 2 locations and on a rocky notch at the landward margin of the platform at a third. Juvenile recruits (25-55 mm shell length) were present each year, usually at low densities (<1 m-2), but localized pulses of recruitment occurred in some years. Annual survival rates of marked limpets varied among sites and cohorts, ranging from 0.42 yr-1 at the notch to 0.79 and 0.87 yr-1 on the platforms. A mass mortality of limpets on the platforms occurred in 2003, likely mediated by thermal stress during daytime low tides, coincident with high air temperatures and calm seas. Juveniles grew rapidly to adult size within 2 yr. Asymptotic size (L∞, von Bertalanffy growth model) ranged from 89 to 97 mm, and maximum size from 100 to 113 mm, on platforms. Growth rate and maximum size were lower on the notch. Our empirical observations and simulation models suggest that these populations are relatively stable on a decadal time scale. The frequency and magnitude of recruitment pulses and high rate of adult survival provide considerable inertia, enabling persistence of these populations in the face of sporadic climatic extremes.

Compositional Kinetics – Ordovician Goldwyer and Bongabinni formations, Canning Basin, Western Australia: Data Release

2021 ◽  
Author(s):  
B. Horsfield ◽  
C.J. Boreham ◽  
D.S. Edwards ◽  
R. di Primio ◽  
V. Tiem
Keyword(s):  
Western Australia ◽  
Canning Basin ◽  
Data Release
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