Quantified Detection of Carbonate Cementation in Sandstones using Standard Wireline Log Data

Mark Bunch

doi:10.1080/22020586.2019.12073185

2nd Australasian Exploration Geoscience Conference: Data to Discovery

ISSN: 2202-0586
E-ISSN:

oa Quantified Detection of Carbonate Cementation in Sandstones using Standard Wireline Log Data
Authors Mark Bunch^a
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^a Australian School of Petroleum University of Adelaide, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2019, Issue 2nd Australasian Exploration Geoscience Conference: Data to Discovery, Dec 2019, p. 1 - 7
DOI: https://doi.org/10.1080/22020586.2019.12073185
- Published online: 01 Dec 2019

Abstract

Summary

Carbonate cemented zones were identified within the lower Paaratte Formation of the eastern Otway Basin, Victoria, in southeastern Australia. A wireline log model trained on these zones can predict carbonate cementation within Late Cretaceous to Paleocene reservoir sandstones of the Latrobe Group, Gippsland Basin, 100s of km to the east. Predictions are supported by published evidence and match cementation facies interpreted for other data acquired there. These sandstones are thought to have once been heavily cemented prior to development of secondary porosity that produced the world-class petroleum reservoirs we see today. Cemented zones that remain must act as obstructions to reservoir fluid migration. They may also react with the mild carbonic acid that would be introduced by CO2 storage (sequestration) operations of the future. Model predictions show that cemented zones are sparse, spatially sporadic and fall well below seismic survey resolution at modern-day reservoir depths. This study emphasises the challenge in mapping their distribution but provides predictions against which to measure future mapping attempts.

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References

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/content/journals/10.1080/22020586.2019.12073185

Article Type: Research Article

Keyword(s): carbonate cement; modelling; probability; siliciclastic succession; wireline logging

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