Geochemical Characteristics of Two Sets of Excellent Source Rocks in Dongying Depression
Geochemical Characteristics of Two Sets of Excellent Source Rocks in Dongying Depression
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发表时间：
2003
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通讯作者：
Zhu Guang-you
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作者：
Zhu Guang-you
东营凹陷原油主要来源于沙三段下、沙四段上两套烃源岩。本文以丰富的地球化学资料为基础，分析了两套烃源岩在沉积学和地球化学特征上的差异。3段上部沉积物形成于咸水-半咸水的深湖-半深湖环境，4段上部沉积物形成于咸水-咸水的浅湖-半深湖环境。探讨了有机质的聚集和保存特征，指出古生烃量高和缺氧环境控制了两套优质烃源岩的形成。卤水条件对四段上部有重要影响，藻华控制了四段上部和三段下部富有机质烃源岩的形成。
The crude oil in Dongying depression mainly came from underlayer of Member 3 and upperlayer of Member 4 source rocks in the Shahejie Formation. On the basis of abundant geochemical data, the authors analyzed the discrepancies in sedimen ta ry and geochemical characteristics of the two sets of source rocks. The underlay er of Member 3 developed in deep lake-semideep lake with saline water-semisal ine water, but the upperlayer of Member 4 formed in shallow lake-semideep lake wi th brine water-saline water. Moreover, the authors discussed the accumulatio n and preservation features of organic matter and pointed out that high paleo-pro duct ivity and anoxic environment controlled the formation of the two sets of excelle nt source rocks. Brine condition has an important effect on upperlayer of Membe r 4 and algal blooms controlled the formation of source rocks with rich organic m atter in upperlayer of Member 4 and underlayer of member 3.