The oil sand bitumen was formed by the biologically degraded crude oil which originates from terrigenous organic matter.
结果表明，其为陆源湖相有机质生成的原油经生物氧化降解形成的。
2
In Meizhou bay, the strong tidal stream transports its mud and sand from open sea, but is restricted to a certain extent, making the terrigenous clasts of the bay the main source of sediment.