| 济阳坳陷东营凹陷古近系沙河街组深湖相油页岩的特征及成因 |
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| 引用本文： | 朱光有,金强,张水昌,戴金星,王冠民,张林晔,李剑.济阳坳陷东营凹陷古近系沙河街组深湖相油页岩的特征及成因[J].古地理学报,2005,7(1):59-69. |
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| 作者姓名： | 朱光有 金强 张水昌 戴金星 王冠民 张林晔 李剑 |
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| 作者单位： | [1]中国石油勘探开发研究院，北京100083 [2]石油大学地球资源与信息学院，山东东营257061 [3]中国石化胜利油田地质科学研究院，山东东营257015 |
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| 基金项目： | 中国石油天然气集团公司石油科技中青年创新基金资助 (0 4E70 5 0 )，中国博士后科研基金资助 (2 0 0 40 3 5 0 69) |
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| 摘 要： | 古近系沙河街组沙三段下部发育的深湖相油页岩是东营凹陷最重要的优质烃源岩。该油页岩呈深灰色或棕褐色，页理发育，主要由富含有机质纹层和浅灰色钙质纹层形成的毫米级沉积层偶组成。其中有机质纹层中的有机碳含量在5％以上，富含藻类化石及鱼化石等；钙质纹层主要由方解石组成，呈灰白色。沉积环境分析表明，该油页岩形成于湿润气候条件下的半咸水-微咸水的深湖缺氧环境中，沉积速率较慢，湖盆处于欠补偿状态，水体分层结构使沉积有机质得到有效保存。藻类等水生生物勃发吸收了更多的CO2，从而诱发大量内生成因的碳酸盐沉淀，形成碳酸盐纹层，而藻类的死亡则导致湖水有机质输送通量增多，使沉积物中有机质保存量增大，促使高有机质丰度烃源岩的形成。因此，分层的水体结构和藻类的勃发是油页岩形成的重要控制因素。
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| 关 键 词： | 纹层 油页岩 古近系 东营凹陷 烃源岩 湖相 形成 沙河街组 济阳坳陷 沉积有机质 |
Characteristics and origin of deep lake oil shale of the Shahejie Formation of Paleogene inDongying Sag,Jiyang Depression |
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| Zhu Guangyou Jin Qiang Zhang Shuichang Dai Jinxing Wang Guanmin Zhang Linye Li Jian Research Institute of Petroleum Exploration and Development,PetroChina Company Ltd.,Beijing Faculty of Geo-resource and Information,University of Petroleum,Dongying ,Shandong Geological Scientific Research Institute of Shengli Oilfield Co.Ltd.,SINOPEC,Dongying ,Shandong.Characteristics and origin of deep lake oil shale of the Shahejie Formation of Paleogene inDongying Sag,Jiyang Depression[J].Journal of Palaeogeography,2005,7(1):59-69. |
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| Authors: | Zhu Guangyou Jin Qiang Zhang Shuichang Dai Jinxing Wang Guanmin Zhang Linye Li Jian Research Institute of Petroleum Exploration and Development PetroChina Company Ltd Beijing Faculty of Geo-resource and Information University of Petroleum Dongying Shandong Geological Scientific Research Institute of Shengli Oilfield CoLtd SINOPEC Dongying Shandong |
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| Affiliation: | Zhu Guangyou 1 Jin Qiang 2 Zhang Shuichang 1 Dai Jinxing 1 Wang Guanmin 2 Zhang Linye 3 Li Jian 1 1 Research Institute of Petroleum Exploration and Development,PetroChina Company Ltd.,Beijing 100083 2 Faculty of Geo-resource and Information,University of Petroleum,Dongying 257061,Shandong3 Geological Scientific Research Institute of Shengli Oilfield Co.Ltd.,SINOPEC,Dongying 257015,Shandong |
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| Abstract: | Deep lake oil shale in the lower part of Member 3 of Shahejie Formation is the most important high quality source rock in Dongying Sag. This dark grey or brown oil shale develops numerous lamellation and is composed of tenuous organic lamina and grey calcareous lamina. In organic lamina,the content of organic carbon exceeds 5% and algae fossils and ichthyolite are abundant.Calcareous lamina is made up of calcalcite and has a grey-white color. The analysis of sedimentary environments shows that this oil shale was formed in semi-saline water or saline water of deep lake anoxic environments under humid climate. In this environment,the sedimentation rate was low,the lake basin was in a starved condition,and the delamination of water body effectively preserved sediment organic matter. By absorbing more CO 2 ,algal blooming results in lots of carbonate sedimentation and formed carbonate laminas. However,the algal death spurs the formation of source rocks with high organic content. Therefore,delamination of water body and algal blooming are the main controlling factors in the formation of oil shale. |
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| Keywords: | oil shale algal blooming delamination of water body lamina Dongying Sag |
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