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。
A big breakthrough of natural gas exploration were made in petroliferous Changling Faulted Depression, and high quality source rocks were also developmented in this region.
长岭断陷是一个富气凹陷，天然气勘探取得较大突破，其深层发育了优质的烃源岩。
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。
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