The matrix for many geochemical processes is water.
Water is ubiquitous in sedimentary basins. It may occur as a free aqueous phase in rock pores, as a water film around mineral grains (the so-called irreducible water content), or is bound into the crystal lattice of clay minerals or others. As such, the aqueous microsphere in the subsurface is the reactor in which a seemingly limitless number of hydrogeochemical processes takes place.
Rather unique underground systems are petroleum systems in which hydrogeochemical processes took/take place. Based on thermodynamics of chemical equilibrium, calculation of interrelated , complex organic-inorganic interactions is thus essential to quantify the the WHERE, WHEN and HOW MUCH of these processes.
The pure-basic considerations of the WiPS.consulting approach about hydrogeochemical processes in petroleum systems are based on several scientific key publications: