4th International Conference of Palaeogeography

190 / 2019-06-12 11:22:34

Importance of Hydrodynamic Conditions on Distribution of Terrestrial Source Organic Matter in Deep Water Region

Delta-shallow sea sedimentary system; Oil and Gas Exploration in Deep Water Area; Terrestrial organic matter; Hydrodynamic conditions

The delta-shallow sea sedimentary system is a special sedimentary system with both terrestrial and marine organic matter. It has been found that terrestrial organic matter contributes greatly to hydrocarbon generation in deep water exploration practice. Based on a large number of investigations on the distribution law of terrestrial organic matter and related influencing factors, this paper expounds the significance of hydrodynamic conditions for the occurrence of terrestrial organic matter in deep water. There are many factors controlling the distribution of terrestrial organic matter, including debris particle size, mineral composition, hydrodynamic type, hydrodynamic intensity and water salinity. The terrigenous organic matter diffused into the deep water region by the dissolved state is largely removed, which is not enough to form effective parent material for large-scale hydrocarbon generation. In oil and gas exploration, great breakthroughs have been made under the guidance of deep-water turbidite source rock model. Therefore, large-scale hydrodynamic transport of organic matter may be the key factor for the existence of terrestrial organic matter in deep water areas, and it is of great significance to study the relationship between hydrodynamic conditions and the occurrence of terrestrial organic matter in deep water areas.