This book systematically introduces the petroleum geological characteristics and exploration theory of marine strata in China. On the basis of four major basins, 14 typical cases have been studied in which 13 cases are from conventional oil and gas fields and 1 case is from shale gas field, along with their hydrocarbon generation, migration, accumulation, and distribution characteristics. The book provides a reference for geologists around the globe to understand the exploration history, methods and advances in marine strata oil and gas exploration in China.