The role of seal integrity in the Vlaming Sub-basin (Perth Basin) for preservation of hydrocarbon accumulations

Irina Borissova; George Bernardel; Chris Southby; Megan Lech

doi:10.1071/ASEG2015ab022

24th International Geophysical Conference and Exhibition – Geophysics and Geology Together for Discovery

ISSN: 2202-0586
E-ISSN:

oa The role of seal integrity in the Vlaming Sub-basin (Perth Basin) for preservation of hydrocarbon accumulations
Authors Irina Borissova^a, George Bernardel^b, Chris Southby^c and Megan Lech^d
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^a Geoscience Australia, GPO Box 378 Canberra, ACT, 2601, [email protected] ^b Geoscience Australia, GPO Box 378 Canberra, ACT, 2601, [email protected] ^c Geoscience Australia, GPO Box 378 Canberra, ACT, 2601, [email protected] ^d Geoscience Australia, GPO Box 378 Canberra, ACT, 2601, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2015, Issue 24th International Geophysical Conference and Exhibition – Geophysics and Geology Together for Discovery, Dec 2015, p. 1 - 5
DOI: https://doi.org/10.1071/ASEG2015ab022
- Published online: 01 Dec 2015

Abstract

The offshore Vlaming Sub-basin, located in the southern part of the Perth Basin, is a Mesozoic depocentre estimated to contain over 12 km of sediments. It has several potential source rock intervals, good reservoir and seal pairs and an active petroleum system. The reasons for a lack of exploration success in this basin have been re-assessed by analysing fault reactivation and signs of hydrocarbon seepage. A recently completed study integrated structural mapping with analysis of fluid inclusion results. New data and interpretations show that a number of synrift faults with signs of reactivation in seismic data also have Fluid Inclusion Stratigraphy (FIS) anomalies above the regional seal. Many previously identified plays rely on the post-rift South Perth Shale for a seal. Our analysis suggests that many faults were reactivated after the deposition of the South Perth Shale, with some showing signs of present-day reactivation. Reactivated faults provided migration pathways for generated hydrocarbons; therefore, no accumulations were formed at these locations. The study provides insight into the location of leaky structures and areas with potentially valid plays in the Vlaming Sub-basin.

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References

Causebrook, R., Dance, T. and Bale, K., 2006, Southern Perth Basin site investigation and geological model for storage of Carbon dioxide. CO2CRC Report Number; RP06-0162.
Crostella, A. and Backhouse, J., 2000, Geology and petroleum exploration of the central and southern Perth Basin, Western Australia. Western Australia Geological Survey, Report 57, 75p.
FLUID INCLUSION TECHNOLOGIES, 2014 [web page], Fluid Inclusion Stratigraphy. Available at: http://fittulsa.com/fis.php (last accessed on 11/08/2014).
Hall, P.B., 1989, The future prospectivity of the Perth Basin. APPEA Journal 29(1), 440-449.
Miyazaki, S., Cadman, S.J., Vuckovic, V., Davey, S.J. and Conolly, J.R., 1996, Vlaming Sub-basin Petroleum Prospectivity. Petroleum Prospectivity Bulletin 1996/1, Bureau of Resource Sciences: Canberra.
Neumann, V., di Primio, R. and Horsfield, B., 2007, Burial history modelling and petroleum fluid bulk compositional predictions on the Vlaming and Mentelle sub-basins, offshore
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Nicholas, W.A., Borissova, I., Radke, L., Tran, M., Bernardel, G., Jorgensen, D., Siwabessy, J., Carroll, A. and Whiteway, T., 2013, Seabed environments and shallow geology of the Vlaming Sub-Basin, Western Australia: marine data for the investigation of the geological storage of CO2. GA0334 post-survey report. Record 2013/09. Geoscience Australia: Canberra.
Nicholson, C.J., Borissova, I., Krassay, A.A., Boreham, C.J., Monteil, E., Neumann, V., di Primio, R. and Bradshaw B.E., 2008, New exploration opportunities in the southern Vlaming Sub-basin, The APPEA Journal, 371-379.
Parnell, J. Middleton, D., Honghan, Chen and Hall, D., 2001, The use of integrated fluid inclusion studies in constraining oil charge history and reservoir compartmentalisation: examples from Jean d’Arc Basin, offshore Newfoundland. Marine and Petroleum Geology 18, 535-549.
Southby S., Lech, M., Wang L. and Borissova I., 2015, Geomorphology and seismic stratigraphy of the Early Cretaceous delta in the Vlaming Sub-basin and implications for seal quality, ASEG-PESA 2015, Extended abstracts, this volume.

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Article Type: Research Article

Keyword(s): hydrocarbons; petroleum prospectivity; seal integrity; Vlaming sub-basin

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