It is known that the organic matter in the upper layer of sediments gets lost fast

but not in the South Huanghai Sea (Yellow sea). Some of the major characteristics of organic geochemistry of sediments in the South Huanghai Sea can be summarized as follows: A scattered show of organic matter does not necessarily indicate the presence of petroleum in recent marine sediments. In research into the genesis of petroleum

people pay more attention to the study of the organic geochemistry of recent marine sediments. How much organic materials was lost during the deposition up to the diagenesis? The problem is as important as the study on the transformation of organic matter. This study on the organic geochemistry of the sediments is based on surveying data of oil pollution in the northern part of the South Huanghai Sea.