海相沉積沉積相的一個一級相組。受海水物理化學條件、水動力狀況、海底地形與海水深度等因素影響,海相沉積又可分為濱岸相淺海陸棚相半深海相深海相等多個二級相組,各相組下又可再分為數個三級相。海洋是沉積物堆積的重要場所,世界上許多大油氣田多出現於海相地層,例如四川油氣田塔里木油氣田等均屬海相沉積。

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