Diagenesis has both favorable and unfavorable effects for quartz-poor sandstone of high clay mineral content.
成岩作用对高含粘土矿物的贫石英砂岩既有有利的一面，也有不利的一面。
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.
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。
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