Abstract:
The Vøring Basin, in the Norwegian midland near the sea has favorable geological conditions for hydrocarbon accumulation. To gain a deeper understanding on the fault structure and hydrocarbon exploration potential in the basin, available gravity and magnetic data have been analyzed systematically. The Varimax transformation technique was applied to eliminate the influence of latitude changes on the magnetic data. Additionally, the edge detection technique for potential fields was utilized to delineate the edge of the local field in this area. By integrating existing geological and geophysical knowledge, a systematic analysis on the gravity and magnetic anomalies in the study area was conducted, and ultimately the fault structure features of the Vøring Basin were identified and the outlining favorable areas for hydrocarbon exploration were defined. Result indicates that the secondary faults in the Vøring Basin exhibit complex orientations, including mainly two sets of major faults in northeast and nearly north-south directions respectively. Additionally, there are other two sets of faults trending northwest and nearly east-west, and they often cut across the first two sets of faults. The basin is surrounded by four major boundary faults (F1~F4), which control the development of secondary structures in the area. Favorable hydrocarbon exploration areas in the Vøring Basin were delineated, represented by high-amplitude anomalies with clear gradients in the second-order vertical derivative anomalies, as well as anomalous bands controlled by faults and their flanks, as evidenced on the gravity gradient map.