After multi-stage superimposing of tectonic movement, the petroleum geological conditions of the marine sequence in China are influenced increasingly by the postnatal factors. The oil and gas reservoirs discovered at present are the residual and secondary oil and gas reservoirs which have undergone the relocation and phase change. Thus, the particularities caused by the evolution of late oil and gas reservoirs should be given more attention in the oil and gas exploration in the marine sequence to deepen the influence of the overall preservation of environment on the formation and preservation of oil and gas reservoirs.