Innovative processing of high-resolution aerial geophysical survey data (gravity, magnetic and gr... more Innovative processing of high-resolution aerial geophysical survey data (gravity, magnetic and gravity gradiometery) combined with minimal geological data can constrain and validate realistic 3D geology models. In this way, exploration programmes in pre-3D seismic survey phases can access relatively low cost data acquisition and interpretation methods to facilitate detailed geological and structural interpretation, and thus elucidate spatial locations of source rocks, reservoirs, and potential sites for hydrocarbon traps. Our case study focuses on the Merlinleigh Sub-basin, part of the southern Carnavon Basin in Western Australia (Figure 1). For this project we built an initial 3D geology model constrained by minimal geological mapping and just two interpreted regional seismic sections. (Alternatively, a couple of deep stratigraphic wells could have been used.) Next we refined and validated the model using enhanced processing workflows applied to potential field data, including mult...
Analysis of three vertical profiles from the southern Mawson Escarpment (Lambert Graben) reveals ... more Analysis of three vertical profiles from the southern Mawson Escarpment (Lambert Graben) reveals apatite fission track (AFT) ages ranging from 102±20 to 287±23 Ma and mean lengths of 12.2 to 13.0 µm. Quantitative thermal histories derived from these data consistently indicate onset of slow cooling below 110°C began sometime prior to 300 Ma, and a second stage of rapid cooling from paleotemperatures up to ≤100°C to surface temperatures occurred in the Late Cretaceous - Paleocene. The first cooling phase refers to Carboniferous - Jurassic basement denudation up to 5 km associated with the initial rifting of the Lambert Graben. The presence of the ancient East Antarctic Erosion Surface and rapid Late Cretaceous - Paleocene cooling indicate a second denuda- tional episode during which up to 4.5 km of sedimentary cover rocks were removed, and that is likely linked to the Cretaceous Gondwana breakup between Antarctica and India and subsequent passive continental margin formation. Citation...
Innovative processing of high-resolution aerial geophysical survey data (gravity, magnetic and gr... more Innovative processing of high-resolution aerial geophysical survey data (gravity, magnetic and gravity gradiometery) combined with minimal geological data can constrain and validate realistic 3D geology models. In this way, exploration programmes in pre-3D seismic survey phases can access relatively low cost data acquisition and interpretation methods to facilitate detailed geological and structural interpretation, and thus elucidate spatial locations of source rocks, reservoirs, and potential sites for hydrocarbon traps. Our case study focuses on the Merlinleigh Sub-basin, part of the southern Carnavon Basin in Western Australia (Figure 1). For this project we built an initial 3D geology model constrained by minimal geological mapping and just two interpreted regional seismic sections. (Alternatively, a couple of deep stratigraphic wells could have been used.) Next we refined and validated the model using enhanced processing workflows applied to potential field data, including mult...
Analysis of three vertical profiles from the southern Mawson Escarpment (Lambert Graben) reveals ... more Analysis of three vertical profiles from the southern Mawson Escarpment (Lambert Graben) reveals apatite fission track (AFT) ages ranging from 102±20 to 287±23 Ma and mean lengths of 12.2 to 13.0 µm. Quantitative thermal histories derived from these data consistently indicate onset of slow cooling below 110°C began sometime prior to 300 Ma, and a second stage of rapid cooling from paleotemperatures up to ≤100°C to surface temperatures occurred in the Late Cretaceous - Paleocene. The first cooling phase refers to Carboniferous - Jurassic basement denudation up to 5 km associated with the initial rifting of the Lambert Graben. The presence of the ancient East Antarctic Erosion Surface and rapid Late Cretaceous - Paleocene cooling indicate a second denuda- tional episode during which up to 4.5 km of sedimentary cover rocks were removed, and that is likely linked to the Cretaceous Gondwana breakup between Antarctica and India and subsequent passive continental margin formation. Citation...
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