Fig. 9
Conceptual model explaining origin and migration of OM from the seawater into different lithologies in the Totalp unit. a The OM is represented by particulate and dissolved organic matter (POM and DOM, respectively). The OM infiltrates the basement rock by rock-fluid circulation. b Some OM may be deposited within the carbonate veins (e.g. calcite veins). c OM circulates with fluids through fractures and porosity of sediments to migrate into the basement rock. d OM is preserved at the surfaces and in the interlayer surfaces of clay minerals in the sediments