Geoscience Visual Presentation G08: Beneath the surface: 3D geological model of northern Bowen Basin

Abstract

Geoscience Visual Presentation G08

Three-dimensional (3D) geological models are critical inputs for resource assessment of any commodity as they provide a detailed representation of subsurface geology. They enable better informed decision making and, therefore, mitigation of risks associated with exploration and production in structurally complex areas. This paper presents a recent subsurface geological model of the northern Bowen Basin in Queensland, eastern Australia. It is considered as a rich basin that yields significant coal and natural gas resources but also has potential for underground geo-storage. Since its discovery, the basin has been mapped, drilled and geophysically surveyed, informing a series of regional solid geology and structural maps as well as mine to deposit scale subsurface models of increased detail. This study integrates data from over 2000 boreholes, 600 seismic lines, digital elevation models and surface geological maps to create a 3D geological model of the thrust-faulted northern Bowen Basin. The approach was to package the stratigraphy by age, but more so rheological differences. This 3D model is composed of three main packages, including surface to Cenozoic unconformity; Bowen Basin fill between the Mid Permian and Cenozoic unconformities; and the early Permian extensional basins below the Denison Trough. The final model features 14 horizons, 24 regional faults and large-scale intrusions. The model was constructed with an areal and vertical resolution of 600 m and 150 m, respectively. This model presents a regional 3D picture of the northern Bowen Basin and offers significant insights and implications for various energy and resource sectors.

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