国内外海相大油气田的烃源岩均为粘土矿物含量较高的笔石页岩、油页岩和泥灰岩，形成于由台地向海槽过渡的深水斜坡环境。
High content clay mineral shale, oil shale and marlite are the main source rocks for large oil or gas fields in the world, which formed in deep water slopes between platform and open sea.
藏南定日地区在白垩纪中期发育一套浅灰色深灰色的以钙质页岩、泥灰岩及微晶灰岩为主的浅海陆棚相沉积，岩石中除含较高的粘土矿物及陆源石英矿物颗粒以外，还含有十分丰富的有孔虫化石。
The Middle Cretaceous shallow sea sediments, represented by a series of light dark gray marine clastic and carbonate rocks, were well exposed along the Gongzha Section in Tingri, southern Tibet.
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