Publications

Upper Permian through Upper Cretaceous successions in and around the Abadi gas field record a series of transgressive – regressive cycles mainly controlled by tectonic revolution of continental rifting and subsequent breakup. They are divided into (i) the Upper Permian to Upper Triassic pre-rift deposits, (ii) the Upper Triassic two-story lowstand incised valley complex, (iii) the Upper Triassic and (iv) the Lower to Middle Jurassic transgressive deposits, (v) the Middle to Upper Jurassic deposits which acts as main reservoir in the Abadi field, (vi) the Lower to Upper Cretaceous and (vii) the Upper Cretaceous post-rift deposits. The main provenance of the Middle Jurassic Plover Formation in the Abadi field is postulated to locate to the north. This is implied by the direction of incised valley complex in the interval (ii), outline of the regional isochore thickness in the intervals (iii), (iv), (v), and sedimentary facies variation observed in the cores in the interval (v). These suggest that the paleogeography in and around the Abadi field in Jurassic was an elongated large-scale embayment trending NNE-SSW, facing the open sea to the south. The provenance is speculated as a regional uplifted rim along rift valleys propagated from a triple junction to the north, where at present is beneath the complex Timor-Tanimbar collision area of the Banda Outer Arc. A turnover of sediment supply from the north to the southern mainland of Australia has occurred in the Early Cretaceous due to the thermal subsidence lead by the continental drift during this period.