Abstract
Based on the analysis of 2-D seismic, drilling and logging data, the tectonic environment was in rifting during the Jurassic period in the whole northeastern part of North Bonaparte Basin, Australia. Five 3rd-graded sequences have been identified from continental to marine environments in Jurassic sedimentary rocks. During the early stage of Early Jurassic epoch, the sedimentary center was mainly in the NW -trending sag and syncline under the control of NW-trending structures. During the late stage of Early Jurassic epoch, NE-trending structures began to develop and the whole basin was subsided rapidly,which resulted in the internal structures cut into fragmented areas since NW-trending units were collided with NE trending units. At the end of Middle Jurassic, the Callovian Unconformity developed and NW-trending structures formed as wide uplifting in the northern part of the basin, after which this region turned to be stable and entered into the phase of slow depression. Under this background of tectonic evolution, fluvial and alluvial fan facies mainly deposited during Early to Middle Jurassic epoch, transitional fan -delta and delta facies deposited during Middle Jurassic epoch, and neritic and littoral facies did during Late Jurassic epoch.
Key words
Jurassic; Tectonic Evolution; Paleogeomorphology; Sedimentary facies; Sequence stratigraphy; Bonaparte Basin
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Jurassic Paleogeomorphology and Sedimentary Facies Characteristics in the Northeastern Part of North Bonaparte Basin[J]. Marine Origin Petroleum Geology. 2012, 17(1): 59-65
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