Geochemical prospecting of oil and gas deposits in the sedimentary cover is based on the tendency of hydrocarbons to subvertical migration from the places of accumulation to the bottom surface. The driving force for the hydrocarbon migration is the gradients of concentration and pressure, and the conducting channels are disruptive disturbances in the earth's crust. Migrating hydrocarbon fluids form typical concentration anomalies in the near-surface bottom sediments.
We provide two types of marine geochemical surveys:
Areal geochemical survey covers the uniform data network test zone and is used to assess the oil and gas potential of promising areas. This method is relevant both at the preliminary stage, preceding the seismic survey, and at the final stage of exploration prior to delimitation of the discovered deposits. The detected geochemical anomalies can be related both to structural and nonstructural traps.
Profile geochemical survey is carried out along the seismic profiles and allows to obtain complex sections that combine geophysical and geochemical data. The detailed analysis of such sections significantly increases the information content and reliability of exploration works.