Tertiary uplift estimation from velocity data in the Eromanga Basin

Rodgers, Janise E.; Wehr, F. L.; Hunt, Jr. William J.

doi:10.1071/eg991321

Cited by 7 publications

(5 citation statements)

References 3 publications

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Section: Maps Of Apparent Exhumation Derived From Individual Units Inmentioning

confidence: 97%

“…The Tertiary is absent or very thin over the maxima in exhumation to the north of the Jackson-Naccowlah area and in the vicinity of the Curalle-1 well (Rodgers et al 1991). The region of lower exhumation between these two maxima (Windorah Trough) corresponds to a minor depocentre which holds in excess of 100 m of Tertiary sediments (Rodgers et al 1991). The Patchawarra Trough is part of the major Tertiary depocentre of the area (with up to 300 m of Tertiary sediments) (Rodgers et al 1991) and this is consistent with the interpret- …”

Section: Maps Of Apparent Exhumation Derived From Individual Units Inmentioning

confidence: 98%

“…The Eromanga Basin of South Australia and Queensland is not at its maximum burial depth due to Late Cretaceous-Tertiary exhumation (Rodgers et al 1991;Mavromatidis 1997). The Eromanga Basin sediments were deposited in Jurassic and Cretaceous times in mainly fluvial-lacustrine and shallowmarine environments (Bowering 1982) after the deposition of the Cooper Basin sediments, in Late Triassic-Early Jurassic times (Thornton 1979).…”

Section: Introductionmentioning

confidence: 98%

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Quantification of exhumation in the Eromanga Basin and its implications for hydrocarbon exploration

Mavromatidis¹,

Hillis

2005

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Exhumation in the Eromanga Basin of South Australia and Queensland has been quantified using compaction methodology. All methods of estimating exhumation utilize rock properties that are affected by, and retain a memory of, burial in excess of that presently observed. The tool used for estimating the exhumation in this study is analysis of the degree of overcompaction of rock units. Since porosity describes compaction state, the sonic log, controlled strongly by the amount of porosity, is an appropriate indicator of compaction and, hence, is used for quantifying exhumation from compaction. The standard method of estimating exhumation based on the degree of overcompaction of a single shale unit has been modified, and seven units, predominantly shales ranging in age from the Cretaceous to the Jurassic, have been analysed. All units yield similar results. Burial at depth greater than currently observed is the most likely cause of overcompaction since it is unlikely that sedimentological and/or diagenetic processes are responsible for similar amounts of overcompaction in different lithologies. The results of the compaction analysis reveal that Late Cretaceous-Tertiary exhumation increases eastwards from the Patchawarra Trough, through the Gidgealpa-MerrimeliaInnamincka Trend and Nappamerri Trough into the Queensland sector of the basins. This study has major implications for hydrocarbon exploration. Predicted maturation of source rocks will be greater for any given geothermal history if exhumation is incorporated in maturation modelling. The exhumation study helps to quantify velocity anomalies associated with overcompaction. Exhumation values can also be used to improve porosity predictions of reservoir units in undrilled targets.

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Section: Maps Of Apparent Exhumation Derived From Individual Units Inmentioning

confidence: 97%

Section: Maps Of Apparent Exhumation Derived From Individual Units Inmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

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Quantification of exhumation in the Eromanga Basin and its implications for hydrocarbon exploration

Mavromatidis¹,

Hillis

2005

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“…Regionally, defining the relative stratigraphic position of dinosaur fossil sites is equally difficult with the added complexity of; (1) regional subsurface structuring ( Exon & Senior, 1976 ; Hoffmann, 1989 ); (2) rapid exhumation and pre-Cenozoic erosion of the Winton Formation ( Keany, Holford & Bunch, 2016 ; Rodgers, Wehr & Hunt, 1991 ); (3) Cenozoic basin filling ( Cook & Jell, 2013 ; Day et al, 1983 ; Krieg et al, 1990 ); (4) deep Winton Formation chemical weathering ( Idnurm & Senoir, 1978 ; Senior & Mabbutt, 1979 ); (5) broadly defined palynomorph zones with no refinement within the Winton Formation ( Monteil, 2006 ); and (6) considerable geographical distance between localities ranging from ~105 km to over 500 km apart.…”

Section: Winton Formationmentioning

confidence: 99%

A new giant sauropod,Australotitan cooperensisgen. et sp. nov., from the mid-Cretaceous of Australia

Hocknull

Wilkinson

Lawrence

et al. 2021

PeerJ

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A new giant sauropod, Australotitan cooperensis gen. et sp. nov., represents the first record of dinosaurs from the southern-central Winton Formation of the Eromanga Basin, Australia. We estimate the type locality to be 270–300 m from the base of the Winton Formation and compare this to the semi-contemporaneous sauropod taxa, Diamantinasaurus matildae Hocknull et al., 2009, Wintonotitan wattsi Hocknull et al., 2009 and Savannasaurus elliottorum Poropat et al., 2016. The new titanosaurian is the largest dinosaur from Australia as represented by osteological remains and based on limb-size comparisons it reached a size similar to that of the giant titanosaurians from South America. Using 3-D surface scan models we compare features of the appendicular skeleton that differentiate Australotitan cooperensis gen. et sp. nov. as a new taxon. A key limitation to the study of sauropods is the inability to easily and directly compare specimens. Therefore, 3-D cybertypes have become a more standard way to undertake direct comparative assessments. Uncoloured, low resolution, and uncharacterized 3-D surface models can lead to misinterpretations, in particular identification of pre-, syn- and post-depositional distortion. We propose a method for identifying, documenting and illustrating these distortions directly onto the 3-D geometric surface of the models using a colour reference scheme. This new method is repeatable for researchers when observing and documenting specimens including taphonomic alterations and geometric differences. A detailed comparative and preliminary computational phylogenetic assessment supports a shared ancestry for all four Winton Formation taxa, albeit with limited statistical support. Palaeobiogeographical interpretations from these resultant phylogenetic hypotheses remain equivocal due to contrary Asian and South American relationships with the Australian taxa. Temporal and palaeoenvironmental differences between the northern and southern-central sauropod locations are considered to explain the taxonomic and morphological diversity of sauropods from the Winton Formation. Interpretations for this diversity are explored, including an eco-morphocline and/or chronocline across newly developed terrestrial environments as the basin fills.

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“…The Lake Eyre Basin consists of three unconformably bounded sequences deposited at less than 10 m Myr −1 (Moussavi‐Harami 1996). Tertiary sediments are thin or absent over much of the Eromanga Basin and the maximum preserved Tertiary thickness is only 300 m (Rodgers et al . 1991).…”

Section: The Origin Of Overpressure In the Cooper Basinmentioning

confidence: 99%

The origin of overpressure in ‘old’ sedimentary basins: an example from the Cooper Basin, Australia

Ruth¹,

Hillis²,

Tingate³

et al. 2003

Geofluids

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Overpressure in ‘old’ sedimentary basins that have not undergone rapid, recent sedimentation cannot be easily explained using traditional burial‐driven mechanisms. The last significant burial event in the Cooper Basin, Australia, was the Late Cretaceous deposition of the Winton Formation (98.5–90 Ma). Maximum temperature in the basin was attained during the Late Cretaceous, with cooling beginning prior to 75 Ma. Hence, overpressure related to rapid burial or palaeomaximum temperatures (e.g. hydrocarbon generation) must have developed prior to 75 Ma. Retaining overpressure for 75 Ma in ‘old’ basins such as the Cooper Basin requires extremely low seal permeabilities. An alternative explanation is that overpressure in the Cooper Basin has been generated because of an increase in mean stress associated with an increase in horizontal compressive stress since Late Cretaceous times. Structural observations and contemporary stress data indicate that there has been an increase in mean stress of approximately 50 MPa between Late Cretaceous times to that presently measured at 3780 m. The largest measured overpressure in the Cooper Basin is 14.5 MPa at 3780 m in the Kirby 1 well. Hence, disequilibrium compaction driven by increasing mean stress can explain the magnitude of the observed overpressure in the Cooper Basin. Increases in mean stress (tectonic loading) may be a feasible mechanism for overpressure generation in other ‘old’ basins that have undergone a recent increase in horizontal stress (e.g. Anadarko Basin).

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Tertiary uplift estimation from velocity data in the Eromanga Basin

Cited by 7 publications

References 3 publications

Quantification of exhumation in the Eromanga Basin and its implications for hydrocarbon exploration

Quantification of exhumation in the Eromanga Basin and its implications for hydrocarbon exploration

A new giant sauropod,Australotitan cooperensisgen. et sp. nov., from the mid-Cretaceous of Australia

The origin of overpressure in ‘old’ sedimentary basins: an example from the Cooper Basin, Australia

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