HYDRODYNAMIC ANALYSIS OF FLOW SYSTEMS AND FAULT SEAL INTEGRITY IN THE NORTH WEST SHELF OF AUSTRALIA

2001 ◽  
Vol 41 (1) ◽  
pp. 347 ◽  
Author(s):  
C.J. Otto ◽  
J.R. Underschultz ◽  
A.L. Hennig ◽  
V.J. Roy
Keyword(s):  
Fluid Flow ◽  
Regional Scale ◽  
Local Flow ◽  
Hydrodynamic Analysis ◽  
North West ◽  
Seal Integrity ◽  
The North ◽  
Regional Flow ◽  
Aquifer Systems ◽  
Migration Pathways

The North West Shelf hydrodynamics pressure database, developed as part of the North West Shelf Hydrodynamics Project, currently contains 7,780 pressure data points and hundreds of stress, temperature and water salinity data. All data have been ranked using a newly developed quality-control system. Equivalent hydraulic head mapping (fluid potential energy analysis) to interpret fluid migration pathways, hydraulic barriers and conduits was shown to be a valid technique despite lateral and vertical fluid density variations. Pressureelevation analysis identified six major aquifer systems (hydrostratigraphic units) in the regional North West Shelf. On a regional scale, the general flow direction in the North West Shelf is from the basins’ depocentres towards the onshore and upwards to the shallower aquifer systems. Compaction-driven flow is the main driving force for fluid flow in the North West Shelf. Overpressured compartments in the Carnarvon Basin are leaking, not hydraulically isolated from the regional flow field, thus generating their own local flow system. In general, fluid flow within the hydrostratigraphic units is parallel to the trend of major fault systems, which act as barriers in the horizontal plane of the aquifer. However, local-scale hydrodynamic analysis has shown that faults can act as fluid conduits between hydrostratigraphic units providing vertical hydraulic communication (e.g. Mardie to Barrow aquifers). Case studies in the Harriet, Gorgon, Griffin, Goodwyn and Vulcan areas have shown that the migration paths can be very complex due to the hydraulic nature of the faults and the presence of overpressured compartments

Regional Renewable Energy Policy: A Process of Coalition Building

2007 ◽  
Vol 7 (2) ◽  
pp. 45-63 ◽  
Author(s):  
Sarah L. Mander
Keyword(s):  
Renewable Energy ◽  
Energy Policy ◽  
Regional Scale ◽  
Climate Change Policy ◽  
Central Element ◽  
Energy System ◽  
Coalition Building ◽  
Low Carbon ◽  
North West ◽  
The North

In 2003, the UK Government adopted a target to reduce carbon emissions by 60 percent by 2050, a longer term commitment than is required under the Kyoto Protocol. Given that increasing low carbon generating capacity is essential to achieve the required carbon reductions, renewable energy policies are a central element of overall climate change policy. To facilitate the building of renewable capacity, greater responsibility has been placed upon the English regions, with the advent of regional sustainable energy strategies, though there remain many profound tensions between the liberalized UK energy system and the adoption of a more strategic approach to renewable energy at the regional scale. This paper uses a ‘discourse analysis’ framework to explore wind energy policy in the North West of England from the perspective of competing coalitions. In the light of this assessment, it is concluded that the implementation of national energy policy at regional and sub-regional scales can be considered as a process of coalition building, where Government is reliant on building partnership between state and non-state actors to achieve its objectives.

The Roebuck Basin, Beagle and Barcoo Sub-basin well folio

2019 ◽  
Vol 59 (2) ◽  
pp. 920 ◽  
Author(s):  
Duy Nguyen ◽  
Nadege Rollet ◽  
Emmanuelle Grosjean ◽  
Dianne S. Edwards ◽  
Steve Abbott ◽  
...  
Keyword(s):  
Lower Cretaceous ◽  
Geochemical Data ◽  
Well Log ◽  
North West ◽  
Sequence Stratigraphic ◽  
Seal Integrity ◽  
Critical Issues ◽  
Secondary Objective ◽  
And Migration ◽  
Migration Pathways

The Roebuck Basin and the adjoining Beagle and Barcoo sub-basins are underexplored areas on Australia’s North West Shelf that are undergoing renewed exploration interest since the discovery of oil at Phoenix South 1 in 2014 and subsequent hydrocarbon discoveries in the Bedout Sub-basin. A well folio of 24 offshore wells across the Beagle, Bedout, Rowley and Barcoo sub-basins has been compiled as part of Geoscience Australia’s hydrocarbon prospectivity assessment across the region. It consists of composite well log plots and well correlations that summarise lithology, lithostratigraphy, Geoscience Australia’s newly acquired biostratigraphic and geochemical data as well as results of petrophysical analysis. A revised sequence-stratigraphic interpretation, key petroleum system elements and drilling results are also documented. The wells dominantly target Triassic shoreward facies (Keraudren Formation) as the primary reservoir objective and Jurassic fluvial-deltaic (Depuch Formation) and/or Lower Cretaceous sandy deltaic facies as the secondary objective. The Keraudren Formation sandstones are sealed intra-formationally either by discontinuous units and/or by the regional Cossigny Member. The Jurassic Depuch Formation sandstones are sealed by regional Lower Cretaceous mudstones. Both charge and structure have been identified as critical issues in the Roebuck Basin. In the Beagle Sub-basin, seal integrity and migration pathways are also considered high risk. Well correlations have identified differences in the basin history and provide insights into the distribution of facies and other characteristics of the Jurassic and Triassic successions.

Procedures for the estimation of regional scale atmospheric emissions—An example from the North West Region of England

1996 ◽  
Vol 30 (17) ◽  
pp. 3079-3091 ◽  
Author(s):  
S.J. Lindley ◽  
J.W.S. Longhurst ◽  
A.F.R. Watson ◽  
D.E. Conlan
Keyword(s):  
Regional Scale ◽  
Atmospheric Emissions ◽  
North West ◽  
The North ◽  
West Region

scholarly journals ONLINE INTEGRATED MODELING ON REGIONAL SCALE IN NORTH-WEST RUSSIA: EVALUATION OF AEROSOLS INFLUENCE ON METEOROLOGICAL PARAMETERS

2018 ◽  
Vol 11 (2) ◽  
pp. 73-83
Author(s):  
Georgy Nerobelov ◽  
Margarita Sedeeva ◽  
Alexander Mahura ◽  
Roman Nuterman ◽  
Suleiman Mostamandi ◽  
...  
Keyword(s):  
Cloud Cover ◽  
Meteorological Parameters ◽  
Regional Scale ◽  
Total Cloud Cover ◽  
North West ◽  
The North ◽  
Aerosol Effect ◽  
Short And Long Term ◽  
Aerosol Effects

In this study the aerosols influence on selected meteorological parameters during two summer 2010 periods is evaluated with focus on the North-West Russia and urban area of St. Petersburg. For that, the seamless fully online-integrated Enviro-HIRLAM model is used. The simulations are realised in short- and long-term modes for selected periods. For evaluation of aerosol influence, in addition to the control/ reference run, the runs with direct, indirect and both combined aerosol effects are performed.It was found that for the North-West Russia region, the direct aerosol effect had increased air temperature (by 1-3˚) and decreased total cloud cover (by 10-20%). The indirect effect decreased temperature (by 0.4-1˚) and increased cloud cover (by 10-20%). The combined effect was the largest territorially; and such effect both decreased temperature and cloud cover (by 1-3˚ and by 6-20%, respectively) as well as increased these (by 0.4-0.6˚ and 1020%).

CARNARVON BASIN ARCHITECTURE AND STRUCTURE DEFINED BY THE INTEGRATION OF MINERAL AND PETROLEUM EXPLORATION TOOLS AND TECHNIQUES

2002 ◽  
Vol 42 (1) ◽  
pp. 287 ◽  
Author(s):  
L.L. Pryer ◽  
K.K. Romine ◽  
T.S. Loutit ◽  
R.G. Barnes
Keyword(s):  
Seismic Data ◽  
Structural Model ◽  
Mineral Exploration ◽  
Petroleum Exploration ◽  
Block Rotation ◽  
North West ◽  
The North ◽  
Northern Carnarvon Basin ◽  
Migration Pathways ◽  
Carnarvon Basin

The Barrow and Dampier Sub-basins of the Northern Carnarvon Basin developed by repeated reactivation of long-lived basement structures during Palaeozoic and Mesozoic tectonism. Inherited basement fabric specific to the terranes and mobile belts in the region comprise northwest, northeast, and north–south-trending Archaean and Proterozoic structures. Reactivation of these structures controlled the shape of the sub-basin depocentres and basement topography, and determined the orientation and style of structures in the sediments.The Lewis Trough is localised over a reactivated NEtrending former strike-slip zone, the North West Shelf (NWS) Megashear. The inboard Dampier Sub-basin reflects the influence of the fabric of the underlying Pilbara Craton. Proterozoic mobile belts underlie the Barrow Sub-basin where basement fabric is dominated by two structural trends, NE-trending Megashear structures offset sinistrally by NS-trending Pinjarra structures.The present-day geometry and basement topography of the basins is the result of accumulated deformation produced by three main tectonic phases. Regional NESW extension in the Devonian produced sinistral strikeslip on NE-trending Megashear structures. Large Devonian-Carboniferous pull-apart basins were introduced in the Barrow Sub-basin where Megashear structures stepped to the left and are responsible for the major structural differences between the Barrow and Dampier Sub-basins. Northwest extension in the Late Carboniferous to Early Permian marks the main extensional phase with extreme crustal attenuation. The majority of the Northern Carnarvon basin sediments were deposited during this extensional basin phase and the subsequent Triassic sag phase. Jurassic extension reactivated Permian faults during renewed NW extension. A change in extension direction occurred prior to Cretaceous sea floor spreading, manifest in basement block rotation concentrated in the Tithonian. This event changed the shape and size of basin compartments and altered fluid migration pathways.The currently mapped structural trends, compartment size and shape of the Barrow and Dampier Sub-basins of the Northern Carnarvon Basin reflect the “character” of the basement beneath and surrounding each of the subbasins.Basement character is defined by the composition, lithology, structure, grain, fabric, rheology and regolith of each basement terrane beneath or surrounding the target basins. Basement character can be discriminated and mapped with mineral exploration methods that use non-seismic data such as gravity, magnetics and bathymetry, and then calibrated with available seismic and well datasets. A range of remote sensing and geophysical datasets were systematically calibrated, integrated and interpreted starting at a scale of about 1:1.5 million (covering much of Western Australia) and progressing to scales of about 1:250,000 in the sub-basins. The interpretation produced a new view of the basement geology of the region and its influence on basin architecture and fill history. The bottom-up or basement-first interpretation process complements the more traditional top-down seismic and well-driven exploration methods, providing a consistent map-based regional structural model that constrains structural interpretation of seismic data.The combination of non-seismic and seismic data provides a powerful tool for mapping basement architecture (SEEBASE™: Structurally Enhanced view of Economic Basement); basement-involved faults (trap type and size); intra-sedimentary geology (igneous bodies, basement-detached faults, basin floor fans); primary fluid focussing and migration pathways and paleo-river drainage patterns, sediment composition and lithology.

SEISMIC DELINEATION OF STRUCTURE-CONTROLLED CARBONATE CEMENT AND POTENTIAL ECONOMIC IMPLICATIONS, ANGEL FIELD, NORTH WEST SHELF

1995 ◽  
Vol 35 (1) ◽  
pp. 280
Author(s):  
S. Ryan-Grigor ◽  
J.P. Schulz-Rojahn
Keyword(s):  
Seismic Data ◽  
High Amplitude ◽  
Fault System ◽  
3D Seismic ◽  
Economic Implications ◽  
Northern Margin ◽  
North West ◽  
The North ◽  
Migration Pathways ◽  
3D Seismic Data

Major carbonate-cemented zones occur in Late Jurassic Angel Formation sandstones of marine mass flow origin that contain large hydrocarbon reserves in the Angel Field, Dampier Sub-basin. Preliminary results suggest that poikilotopic dolomite cement is dominant. The carbonate-cemented zones are identifiable from wireline log response and 3D seismic data, and occur in discrete intervals with a cumulative thickness of approximately 165m at Angel-2. These intervals produce a zone of high amplitude reflections of about 100 ms two-way time. Field-wide seismic mapping indicates that these carbonate-cemented zones sharply abut the northern margin of a major east-west trending strike-slip fault system that traverses this field. The carbonate-cemented zones extend in a wedge-like shape towards the northeast and concentrate along the crest of the main structural trend.The results underscore the importance of 3D seismic data for a better estimation of reservoir risk and reserves in variably carbonate-cemented sandstones.The carbonate-cemented zones may represent a 'plume' related to migration of petroleum and/or carbon dioxide. Therefore delineation of major carbonate-cemented zones using seismic data may aid in the identification of petroleum migration pathways and pools in the North West Shelf. Alternatively, carbonate cements dissolved south of the major fault zone and possibly in downdip locations in which case dissolution pores may exist in these areas. Further research is required to evaluate these hypotheses.

ANALYSIS OF THE DAMPIER SUB-BASIN PETROLEUM SYSTEMS USING INTEGRATED 2D MODELLING TECHNIQUES

1998 ◽  
Vol 38 (1) ◽  
pp. 339
Author(s):  
A. Vear
Keyword(s):  
Fluid Flow ◽  
Lower Jurassic ◽  
North West ◽  
Petroleum Systems ◽  
Fine Grained ◽  
The North ◽  
Abnormal Pressure ◽  
Modelling Techniques ◽  
Seismic Lines ◽  
Modelling Approach

Determining the controls on subsurface pressure, and describing fluid flow within the petroleum systems of the North West Shelf's Dampier Sub-basin, were the primary aims of this work.The study was conducted using Temispack, an integrated forward modelling software package developed by the Institut Français du Pétrole (IFP). Three southeast-northwest trending regional seismic lines were modelled, utilising numerous well penetrations for pressure and temperature calibration, lithological and stratigraphical control. Once a detailed understanding of the regional controls on fluid flow and abnormal pressure distribution had been determined, pre-drill predictions were then made to aid the planning and safe completion of a 1996 exploration well.The primary conclusions of the study are that: a) three intervals constitute significant regional aquifers and alleviate overpressures in even the most remote locations of the Dampier Sub-basin-The Tithonian Angel Sands, Bathonian Legendre Sands and Upper Triassic/Lower Jurassic Sands; b) two intervals are capable of producing severe overpressures-The Muderong Shale and any fine-grained Jurassic sections devoid of lateral carrier beds; and c) with a full and accurate knowledge of structure and stratigraphy, the pressures at a drilling location could be accurately predicted using the 2D basin modelling approach.

Hydrochemical interpretation of groundwater flow systems in Quaternary sediments of southern Ontario

1986 ◽  
Vol 23 (7) ◽  
pp. 938-947 ◽  
Author(s):  
K. W. F. Howard ◽  
P. Beck
Keyword(s):  
Major Ions ◽  
Regional Scale ◽  
Shallow Aquifer ◽  
Sediment Geochemistry ◽  
Quaternary Sediments ◽  
Southern Ontario ◽  
Water Types ◽  
Regional Flow ◽  
Aquifer Systems ◽  
Composite Flow

Shallow aquifer systems in surficial Quaternary sediments are geometrically complex, with highly variable hydraulic characteristics. Consequently these systems are extremely difficult to assess hydrogeologically using conventional investigation techniques and are often poorly understood. In a 500 km2 area of southern Ontario, hydrochemical techniques were used to investigate the hydraulic integrity and regional flow behaviour of 14 aquifer systems defined within 100 m of Quaternary overburden. This type of approach had been used successfully in more extensive bedrock aquifer systems but had not previously been applied on a regional scale to shallow Quaternary systems where sediment geochemistry and flow conditions are highly variable and rarely known. The study involved analysis of over 260 well waters for pH, major ions (Ca, Mg, Na, K, HCO3, Cl, and SO4) and subsidiary ions (NO3, I, Br, and F). Selected samples were analyzed for tritium.The groundwaters are classified into eight water types, two of which are sodium chloride in character and of bedrock origin. Of the remaining six, four are related by a chemical evolutionary sequence showing transition from a tritiated (> 30 TU), low-iodide (< 5 μg/L) CaHCO3 recharge water to an ion-exchanged, NaHCO3 water low in tritium (< 15 TU) and enriched in iodide (> 15 μg/L). The existence of this sequence implies a regional, composite flow system involving seven supposedly discrete aquifer systems.The two remaining water types are recent tritiated waters (> 20 TU) contaminated by road salt (Cl > 40 mg/L) and agricultural nitrate (NO3 > 10 mg/L). Together with the CaHCO3 waters these clearly delineate major areas of recharge and show that the covering of Halton Till is extensively permeable.

scholarly journals Mafic intrusions, hydrothermal venting, and the basalt-sediment transition: Linking onshore and offshore examples from the North Atlantic igneous province

2017 ◽  
Vol 5 (3) ◽  
pp. SK83-SK101 ◽  
Author(s):  
Syahreza S. Angkasa ◽  
Dougal A. Jerram ◽  
John M. Millett ◽  
Henrik H. Svensen ◽  
Sverre Planke ◽  
...  
Keyword(s):  
Seismic Data ◽  
Hydrothermal Vents ◽  
Global Climate ◽  
Regional Scale ◽  
Sedimentary Basins ◽  
Reflection Seismic ◽  
The North ◽  
Lava Sequence ◽  
Flow Pathways ◽  
Migration Pathways

The emplacement of large intrusive complexes into sedimentary basins can have profound effects on host sedimentary rocks including deformation, thermal aureole metamorphic reactions, alteration of fluid-flow pathways, and the formation of associated hydrothermal vent complexes (HVCs). These processes can in turn have major implications for petroleum systems on the local and regional scale, and can contribute to global climate change due to the production and outgassing of greenhouse gases, such as [Formula: see text] and [Formula: see text]. Imaging these features and assessing their implications from seismic data beneath extrusive volcanic cover is challenging due to heterogeneities in the volcanic pile and at the basalt-sediment transition. We have evaluated combined field and laboratory petrophysical data from the Isle of Skye, Scotland, where we identify a seismic-scale example of extensive intrusions interacting with the base-basalt transition. We have also evaluated a unique onshore example of a linked sill and associated HVC cutting up through the lava sequence. We compare these field results with HVCs from reflection seismic data across the Vøring Marginal High, offshore Norway, where subbasalt saucer-shaped intrusions are also seen associated with HVCs cutting the lava sequence. Seismic imaging problems associated with the velocity heterogeneity of volcanic sequences, along with a historical lack of high-quality 3D data in volcanic regions worldwide, is suggested as having largely precluded the identification of these features in the past. The under-representation of these hydrothermal vents in the literature has key implications for the future appraisal of intrusion-related outgassing effects on the global climate such as those related to the Palaeocene Eocene Thermal Maximum, along with subbasalt petroleum prospectivity where they may alter maturation and migration pathways.

scholarly journals Peripherialisation as a Result and Driving Force of Territorial Mobility in Post-Socialist Romania

2018 ◽  
Vol 24 (2) ◽  
pp. 39-57 ◽  
Author(s):  
Aura Moldovan
Keyword(s):  
Statistical Analysis ◽  
Driving Force ◽  
Spatial Configuration ◽  
Regional Scale ◽  
Social Groups ◽  
North West ◽  
The Past ◽  
The North ◽  
West Region ◽  
Different Levels

Over the past two and a half decades, the transition from a centralised to a market economy has affected Romania’s spatial configuration by re-widening the gap between cores and peripheries at a regional scale. Through a statistical analysis carried out for the North-West Region (NUTS 2), my contribution focuses on one of the mechanisms interrelated with peripheralisation, namely territorial mobility. The aim is twofold. First, to show how increasing core-periphery disparities impact mobility flows by offering different levels of structural (dis)advantages. Second, to exemplify how various social groups can influence these (dis)advantages by choosing their place of residence and work.

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