Laboratory methods of pore water extraction from low permeability rocks to study its chemical composition

Pore water composition study is an effective diagnostic tool to understand and interpretate the physical and chemical processes during water-rock interaction. The correct choice of the laboratory extraction method directly defines the quality of its chemical composition results interpretation. The paper reviews the leading modern pore water extraction methods — the centrifugation, Rhizon samplers, high-pressure squeezing, indirect method of water extraction and the method by viscous fluid displacement. The paper presents a number of advantages and disadvantages of these methods, and also characterizes their effectiveness for low permeability rocks with different water saturation.