flat slope meaning in English

平坦坡度

According to the differences of sedimentary facies and environment , the source rock are divided into four types such as lime - mud reef in platform margin , platform inner sag , deep - water flat slope or continental shelf , abyssal basin , the lime - mud reef type is distributed in platform margin of upper ordovician , the remained three types are widely distributed in cambrian - ordovician system
根据沉积相带与沉积环境的不同，可将烃源岩划分为在不同沉积环境中的4种类型烃源岩；台地边缘灰泥丘型烃源岩、台地内凹陷型烃源岩、深水缓坡与陆棚型烃源岩、深海盆地型烃源岩。