New insights into Australian NW Shelf Upper Triassic Mungaroo Formation depositional systems based on the deep exploration well Ironbark-1 and a regionally merged 3D seismic data set
| Autor: | Daniel Bishop, Vincent Dykmans |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Předmět: | |
| DOI: | 10.5281/zenodo.7955993 |
| Popis: | The Ironbark-1 exploration well was drilled by bp and plugged and abandoned as a dry hole on the Australian NW Shelf in January 2021 after drilling to 5592 mTVDSS, providing an important new opportunity to gather data and understand the depositional and petroleum systems of the deep Upper Triassic Mungaroo Formation. Post-well correlation of the well data and results to a regionally merged 3D seismic data set has enabled extrapolation of the well findings into the broader area. Generation of 3D well-calibrated derivative seismic attribute volumes such as Extended Elastic Impedance (EEI) and Amplitude Versus Offset (AVO) classified volumes has enabled detailed mapping of the depositional systems at multiple Triassic levels and provided semi-quantitative estimates of the variability in reservoir and seal presence and quality. Fluvial channel systems within the Carnian Lower Mungaroo Formation are more poorly developed within the Ironbark-1 area than anticipated pre-drill and compared with their occurrence inboard to the east. Development was poorer in terms of channel system breadth, thickness, and reservoir quality. Individual, more isolated fluvial channels within the Norian Middle Mungaroo Formation were more as anticipated, being narrow, low sinuosity, but reasonably thick channel bodies with good reservoir quality. These younger channels may readily be mapped subregionally using the 3D seismic data and derivative attributes and may act as both conduits and traps for hydrocarbons. These new seismic and well observations help explain the effectiveness of the petroleum system as well as the occurrence and nature of hydrocarbon indicators in the well. Open-Access Online Publication: May 22, 2023 |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|