Public Defence: Magnhild Sydnes
The effects of magmatic intrusions on temperature history and diagenesis in sedimentary basins and petroleum systems.
Magnhild Sydnes had her PhD public defence on April 23, 2020. Here she presented her disseration:
”Effects of magmatic intrusions on temperature history and diagenesis in sedimentary basins - and the impact on petroleum systems”
Magma unable to reach the surface and remaining in the subsurface, are referred to as magmatic instrusions. At the time of intrusion, the magma may have a temperature above 1000 °C, while the surrounding environments in which the intrusion occurs may have considerably lower temperature. In a sedimentary basin such heat supply will, among other things, accelerate the transformation process of organic matter (Fig. 1).
In her dissertation, Magnhild investigates the effects of intrusions on temperature history and hydrocarbon maturation, how sensitive temperature history is to various factors in structurally complex basins with magmatic intrusions, and what effects intrusions have on diagenesis and porosity development.
Figure 1: Magmatic intrusions accelerate the transformation process of organic matter in surrounding environments. The Figure illustrates the differences in maturation levels when a); one compares a basin without intrusions to a basin in which there are 100 meter thick intrusions, and b); one compares a basin with 50 meter thick intrusions to a basin with100 meter thick intrusions.