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Australian Energy Producers Journal Australian Energy Producers Journal Society
Journal of Australian Energy Producers
RESEARCH ARTICLE

Velocity anomalies and out-of-plane reflections in Barnicarndy 1, Canning Basin

Y. Zhan
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Geological Survey of Western Australia, 100 Plain Street, East Perth WA 6004, Australia. Email: alex.zhan@dmirs.wa.gov.au

The APPEA Journal 61(1) 271-290 https://doi.org/10.1071/AJ20082
Submitted: 14 January 2021  Accepted: 5 February 2021   Published: 2 July 2021

Abstract

Barnicarndy 1 was drilled as a stratigraphic well and penetrated 2585 m of clastic sedimentary rocks overlying an angular unconformity composed of Proterozoic dolomite basement near SSE end of the eponymous graben (previously known as the Waukarlycarly Embayment) of the Canning Basin. The post-drilling data exhibited several types of anomalies and inconsistencies, including ultra-slow velocity of the vertical seismic profile (VSP) within the top 210 m, substantially high velocity from 210 to 1390 m, poor synthetic–seismic correlation, and discrepancies between the prognosis and actual depths. The VSP shows that the uppermost sedimentary section has an average velocity of less than 1000 m/s, which is unrealistically slow and probably caused by a systematic time delay in the data acquisition. Such a delaying effect was removed when calculating the VSP interval velocity, which had reasonable consistencies with sonic velocity and lithological packages. The consistencies verify that the sections from 210 to 1390 m have high velocities that are beyond the range of offset wells at equivalent depths and do not follow an expected trend along most of the well trajectory. Quantitative analyses of multiple synthetic correlations suggest that the depth discrepancies in the prognosis are not related to pre-drilling seismic interpretation, as the two-way time picks for major boundaries mostly match what has been penetrated in Barnicarndy 1. Two thirds of the depth error for basement prognosis comes from the unexpected high velocity in the shallow formations. The velocity anomalies indicate that the Barnicarndy Graben possibly has a complex history of tectonic movement, and thick sections could have been eroded during the Late Triassic. The remaining discrepancy in depth prognosis for the basement is related to the out-of-plane seismic reflection near the SSE end of the graben. The steeply dipping basement causes out-of-plane issues for 2D seismic data, and the Kidson seismic survey images the shallower basement reflected from further south, rather than what is vertically below the survey route.

Keywords: Canning Basin, out-of-plane, seismic interpretation, sonic, tectonic movement, vertical seismic profile, VSP, Barnicarndy Graben, Western Australia.

Yijie Zhan graduated from China University of Geoscience (Beijing) with a BSc in 2005. He has worked on structural interpretation, fracture detection and reservoir modelling in various basins. He has published in English and Chinese on azimuthal anisotropy, forward modelling and characterisation of gas-bearing volcanoclastic and conventional reservoirs. He joined the Geological Survey of Western Australia’s Basin and Energy Geoscience group as Senior Geophysicist in 2011, and he is a member of PESA.


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