Seismic and sequence stratigraphy of the early Cretaceous Echuca shoals formation, northern Caswell Sub-basin, Browse Basin, Australia
Date
2007
Authors
Hidayat, Amir
Editors
Advisors
Journal Title
Journal ISSN
Volume Title
Type:
Thesis
Citation
Statement of Responsibility
Conference Name
Abstract
The Early Cretaceous Echuca Shoals Formation is known as one of the potential source rock intervals in the northern Caswell Sub-basin. Even though hydrocarbons have been discovered in this formation in the adjacent Yampi Shelf Sub-basin, no hydrocarbons have been found in the northern Caswell Sub-basin. Of 12 wells encountered the Echuca Shoals Formation in this sub-basin, only three penetrated sandstone within this interval. Penetrating sand and finding traps in the Echuca Shoals Formation has become a challenge in exploring this area. Facies analysis and sequence stratigraphic methods were used to identify reservoir sand distributions, to interpret depositional environments, and to predict stratigraphic traps. Reflection configurations from seismic data, log motifs from electric logs and core data were used to identify seismic facies. A chronostratigraphic framework was established for the formation based on spore-pollen biostratigraphy. The Echuca Shoals Formation in the northern Caswell Sub-basin can be divided into two stratigraphic sequences. Sequence I was deposited as lowstand fans and lowstand wedges in a deepwater environment and consists of five channels and five lobes. The channels have a southeast-northwest orientation with an average width to thickness ratio of 1:17. Sequence 2, which was also deposited as lowstand fans and lowstand wedges in a deepwater environment, consists of four channels and four lobes. The channels in Sequence 2 also have a southeastnorthwest orientation with an average width to thickness ratio or l2I. Terminal pinchouts of channels and lobes may represent stratigraphic traps in the area. The results of this work indicate that in the study area there are seven potential candidates for stratigraphic traps in the Echuca Shoals Formation.
School/Discipline
Australian School of Petroleum
Dissertation Note
Thesis (M.Sc.(Petrol.G.&G.))--University of Adelaide, Australian School of Petroleum, 2007
Provenance
This electronic version is made publicly available by the University of Adelaide in accordance with its open access policy for student theses. Copyright in this thesis remains with the author. This thesis may incorporate third party material which has been used by the author pursuant to Fair Dealing exceptions. If you are the owner of any included third party copyright material you wish to be removed from this electronic version, please complete the take down form located at: http://www.adelaide.edu.au/legals