Marine carbonate sediments with large-thickness and gas shows are distributed widely in China.Complexity and difficulties of marine carbonate beds restrains our recognition to the appraisement of oil and gas potential.Establishment of terrestrial oil-generation theory and successful exploration in terrestrial basins paved the way for our petroleum industry.With the development of science and technology and further understanding to the theory,more and more oil fields have been discovered within marine carbonate beds,which have become an important oil-finding area in China.Current oil exploration theory developed in eastern China doesn't apply to or fail to guides oil/gas exploration in the marine sediments.Therefore,marine geological theory should depend on the terrestrial and foreign marine oil/gas theories so that an oil/gas geological theory which suits to marine carbonate beds can be established.