An integrated workflow for characterizing gas potential: Axios-Thermaikos basin (Greece)

• Published in: Acta geophysica Vol. 72; no. 6; pp. 4225 - 4246
• Main Authors: Chavanidis, Konstantinos, Harishidayat, Dicky, Stampolidis, Alexandros, Tsokas, Grigorios N., Salem, Ahmed, Soupios, Pantelis
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 2024; Springer Nature B.V
• Subjects: Carbon dioxide; Carbon dioxide fixation; Data analysis; Earth and Environmental Science; Earth Sciences; Economic importance; Geological mapping; Geological surveys; Geophysical surveys; Geophysics; Geophysics/Geodesy; Geotechnical Engineering & Applied Earth Sciences; Hydrocarbons; Neogene; Oil and gas fields; Pile extraction; Qualitative analysis; Research Article - Applied Geophysics; Seismic activity; Seismic surveys; Seismological data; Stratigraphy; Structural Geology; Tectonics; Three dimensional models; Two dimensional analysis; Workflow; Greece; Axios-Thermaikos basin; Gas prospectivity; Modeling; Data integration
• ISSN: 1895-7455; 1895-6572; 1895-7455
• DOI: 10.1007/s11600-024-01358-8

The Axios-Thermaikos basin in northern Greece is a sedimentary composite depocenter that developed tectonically during the Neogene. It has been considered promising for hydrocarbon resources, with a proven offshore gas field. Several geological and geophysical surveys, including drilling, were conducted in previous decades. However, a complete model of the basin subsurface has yet to be constructed. This paper seeks to understand the hydrocarbon prospectivity of the onshore Axios-Thermaikos basin by analyzing various geophysical (gravity, magnetic, seismic reflection) data and integrating the geophysical model with other available data. Our approach started with a qualitative analysis of the gravity and magnetic data to extract the structural and lithological trends controlling the basin formation and development. Magnetic data were further used to map the interface between the sedimentary pile and the basement. Seismic data were interpreted using different attributes and mapped in detail the geologic contacts and the tectonic regime of the basin. The density variations in depth were investigated using two-dimensional forward modeling constrained by seismic data. As a result, the 2D gravity model displays the interfaces between the formations and the main seismic-scale faults. Based on the seismic and stratigraphic data from wells, preliminary three-dimensional models were built showing the stratigraphic and tectonic regimes, including the presence of structural hydrocarbon traps, and the different depositional environments that have acted in the basin through time. The mapped tectonic structures in the onshore Axios-Thermaikos basin might also be useful for other activities of economic importance, such as gas storage and CO
2
sequestration.