New Insights into the Stratigraphy and Basin Evolution of the Houtman Sub-basin, Offshore North Perth Basin, from a Detailed Sequence Stratigraphic Study  

Authors / CoAuthors

Robertson, D. | Jones, A. | Mantle, D.

Abstract

A high resolution sequence stratigraphic study has been undertaken on the three wells in the Houtman Sub-basin, offshore North Perth Basin: Gun Island 1 (1968), Houtman 1 (1978) and Charon 1 (2008). The study focussed on the late Jurassic Yarragadee Formation, mid Jurassic Cadda Formation and early Jurassic Cattamarra Coal Measures. Log character (particularly gamma ray and sonic), cuttings, sidewall core and conventional core lithologies (including sedimentary structures) and palynological data were used to identify paleoenvironments. Stacking patterns of the interpreted environments were used to define systems tracts and then sequences. New palynological data have been collected by Geoscience Australia for Gun Island 1 and the palynology for all wells has been reviewed from Well Completion Reports and slides from intervals in each well. A number of transgressive systems tracts within the dominantly continental Yarragadee Formation and Cattamarra Coal Measures record small marine incursions into the Houtman Sub-basin. Within these units, the shallow marine intervals switch rapidly with non-marine intervals suggesting a more dynamic environment existed in the Houtman Sub-basin during the Jurassic than previously thought. These marine incursions are not evident in the Yarragadee Formation in Charon 1, indicating a lack of accommodation space or proximal sediment input into the north during the mid-late Jurassic. This has significant implications for reservoir and seal facies of potential Mesozoic petroleum systems in the Houtman Sub-basin.

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nonGeographicDataset

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70835

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• External PublicationAbstract

( Theme )

• sedimentology

( Theme )

• sedimentary basins

( Theme )

• petroleum geology

( Theme )

• palaeogeography

( Theme )

• marine

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• Earth Sciences

• Published_Internal

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2011-01-01T00:00:00

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