
TY  - JOUR
A1  - Moss, S. 
A1  - Barr, D. 
A1  - Kneale, R. 
A1  - Clews, P. 
A1  - Cruse, T. 
T1  - MID TO LATE JURASSIC SHALLOW MARINE SEQUENCES OF THE EASTERN BARROW SUB-BASIN: THE ROLE OF LOW-STAND DEPOSITION IN NEW EXPLORATION CONCEPTS
JF  - The APPEA Journal
JO  - The APPEA Journal
Y1  - 2003
VL  - 43
IS  - 1
SP  - 231
EP  - 253
KW  - 
UR  - https://doi.org/10.1071/AJ02012 
N2  - Several wells drilled along the fault-terraced eastern margin of the Barrow Sub-basin of the Australian North West Shelf have shed light on the pattern of Callovian to Tithonian sedimentation in the area. Much of this section has historically been interpreted as a product of deep marine depositional environments.Sandstone reservoirs cored in Linda&#x2013;1/ST1, Linda&#x2013;2 (both Wanaea spectabilis b age) and Denver&#x2013;1/ST1 (Rigaudella aemula age) exhibit coarsening-upward cycles typical of marine parasequences, and possess sharp, erosive lower contacts with underlying claystone. In the case of Denver&#x2013;1/ST1, the sandstones are heavily bioturbated with a distinct shallow marine trace fossil assemblage. Burrows are less evident in the sandstones from the Linda wells, although several thin bioturbated horizons&#x2014;also with shallow marine trace fossils&#x2014;are encountered. Similar patterns of shallow marine deposition are observed in previously drilled wells within the study area, and evidence of pedogenesis is found in core from Georgette&#x2013;1 (R. aemula age), suggesting that exposure occurred on some of the higher fault terraces during low-stand conditions in the Middle to Late Jurassic.Further to the west, deepwater submarine fan sediments, deposited during low-stands, have been recognised. A range of time equivalent low-stand deposits&#x2014;which are spatially and genetically exclusive&#x2014; therefore exists within the sub-basin. Indeed such a spectrum should be expected in complex and tectonically active areas such as the Jurassic Barrow Sub-basin.The recognition of shallow marine deposits in the area has major implications with respect to the location and geometry of reservoir sandstones. The low-stand shoreface model, as opposed to the deep marine turbidite model, leads to the prediction of sandstone deposition aligned roughly parallel&#x2014;rather than perpendicular&#x2014; to the palaeo-shoreline and the potential for deeperwater sandstones further downdip. 
ER  -

