Gray-black oil shale and black charcoal shale were high quality source rocks in Jurassic system comparatively.
灰黑色油页岩及黑色炭质页岩是侏罗系中的优质烃源岩。
The high salt medium is beneficial to organic concentration and preservation. The gray mudstone and shale in middle Shasi column was a kind of high quality source rocks in Dongying Depression.
高盐环境有利于有机质的富集和保存，沙四中亚段的灰色泥岩和页岩为东营凹陷的一套有效烃源岩。
Effective and high? Quality source rocks make a tremendous contribution to hydrocarbon reservoir forming in spite of a few thickness and special distribution.
有效烃源岩和优质烃源岩厚度不大、分布特殊，但是，它们对油气藏的形成作出了巨大的贡献。
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