关键词: 新构造运动, 晚期成藏, 天然地震, 驱动力, 新生代, 中国近海盆地

Abstract: The classical petroleum geology suggests that oil and gas are generated from the degradation of organic matters and then slowly migrated into the traps with reservoirs by the seepage flow in the long period of geologic history.The process of hydrocarbon accumulation is slow and long.The traditional theories and concepts applied to the hydrocarbon exploration of the China offshore basins are gradually enriched with some new ideas.The hydrocarbon generation,migration and accumulation happened in the long period of geologic history and have still kept activity up to present.Especially,the neotectonism from Pliocene to present has been playing an important role in the distribution and formation of oil and gas fields in offshore basins.The neotectonism controls the late-stage hydrocarbon accumulation and maintains the sustained dynamic equilibrium,in which the amount of accumulation is always greater than that of the diffusion lost of oil and gas.In the slow and long-term geologic process of oil and gas migration and accumulation,the paroxysmal and rapid episodic migration,infilling and accumulation of oil and gas happened.The natural earthquake may be one of the main drive forces.The above viewpoints are discussed by elaborating the samples of the late-stage hydrocarbon supply of Eugene Island Block 330 in the Gulf of Mexico,the late-stage hydrocarbon accumulation of the PL19-3 Oil Field in the Bohai Bay Basin and the DF1-1 Gas Field in the Yinggehai Basin as well as the correlation between hydrocarbon activities and recent major earthquakes in our country.

Key words: neotectonism, late-stage hydrocarbon accumulation, natural earthquake, drive forces, Cenozoic, China offshore basin