| 山东东营凹陷古近系沙河街组湖盆演化及烃源岩赋存相带 |
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| 引用本文： | 张海峰,刘庆,张林晔,张建中.山东东营凹陷古近系沙河街组湖盆演化及烃源岩赋存相带[J].古地理学报,2005,7(3):383-397. |
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| 作者姓名： | 张海峰 刘庆 张林晔 张建中 |
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| 作者单位： | 中国地质大学能源学院,北京,100083;中国石化胜利油田股份有限公司地质科学研究院,山东,东营,257015;中国石化胜利油田股份有限公司地质科学研究院,山东,东营,257015 |
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| 摘 要： | 确定烃源岩在盆地范围内的纵向变化规律及横向分布特征，建立有效烃源岩和油气藏的时空组合关系，正在成为高勘探程度地区继续寻找隐蔽油气藏的一种新的研究方向。东营凹陷沙河街组四段至沙河街组二段下部沉积时期，主要发育湖泊-三角洲沉积体系，通过对近百口钻井的地球化学、沉积学、古生态学等资料的分析，认为该沉积时期古湖盆演化可以划分为五个阶段，即沙四早中期裂陷初始阶段过补偿间歇湖、沙四晚期裂陷加速阶段欠补偿闭流湖、沙三早期裂陷鼎盛阶段欠补偿闭流湖-敞流湖、沙三中期裂陷稳定阶段均衡补偿深水敞流湖以及沙三晚期至沙二早期裂陷衰退阶段过补偿浅水敞流湖。在湖盆特定演化阶段的特定位置，往往出现独特的沉积环境和水面波动规律，从而形成了具有独特有机地球化学特征的烃源岩赋存相带。其中，沙四晚期闭流湖中可以划分出6种，沙三早期闭流湖－敞流湖中可以划分出4种，沙三中期至沙二早期敞流湖中可以划分出6种各具特色的烃源岩赋存相带，主要反映在有机质丰度和有机质类型方面，从而决定了其中烃源岩的生烃特点及生烃潜力。通过对烃源岩赋存相带的沉积环境与烃源岩特征的对比发现，东营凹陷沙四段至沙二段下部烃源岩生烃潜力以及有机地球化学特征，主要受到古湖盆类型、水深以及物源供应三大因素的控制。
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| 关 键 词： | 东营凹陷 烃源岩 湖盆演化 古近系 沙河街组 沉积相 烃源岩赋存相带 |
| 文章编号： | 1671-1505（2005）03-0383-15 |
| 收稿时间： | 2004-09-10 |
| 修稿时间： | 2004-12-26 |
Lacustrine basin evolution and favorable sedimentary facies belt for source rocks abounding in the Shahejie Formation of Paleogene in Dongying Sag, Shandong Province |
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| Zhang Haifeng,Liu Qing,Zhang Linye,Zhang Jianzhong.Lacustrine basin evolution and favorable sedimentary facies belt for source rocks abounding in the Shahejie Formation of Paleogene in Dongying Sag, Shandong Province[J].Journal of Palaeogeography,2005,7(3):383-397. |
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| Authors: | Zhang Haifeng Liu Qing Zhang Linye Zhang Jianzhong |
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| Institution: | 1.School of Energy, China University of Geosciences, Beijing 100083;2.Geological Science Research Institute of Shengli Oilfield，SINOPEC, Dongying 257015, Shandong |
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| Abstract: | In the exploration of subtle oil reservoirs, it is a new researching aspect to determine the relationship between available source rocks and oil reservoirs. So it is essential to make clear the variation and distribution regularities of source rocks. Lacustrine-delta system was mainly developed during the sedimentary period from Member 4 to the lower part of Member 2 of Shahejie Formation in Dongying Sag. By analyzing on geochemistry, sedimentology and palaeoecology data of over 100 drilling holes, the paleo-lacustrine basin evolution can be divided into five stages including over-compensated intermittent lake at the beginning of rifting during the early to middle sedimentary period of Member 4 of Shahejie Formation, permanently blind lake through the acceleration of rifting during the late sedimentary period of Member 4 of Shahejie Formation, blind-outflowing lake at the maximum of rifting during the early sedimentary period of Member 3 of Shahejie Formation, deep water outflowing lake during the subsidence period and shallow outflowing lake through the acceleration of the fall of base level. At different lacustrine stages or different geographical locations of the Dongying Sag, there exist different favorable sedimentary facies belts for source rocks bearing with unique geochemical features.There are 6 kinds of favorable sedimentary facies belts during the late sedimentary period of Member 4 of Shahejie Formation, 4 kinds during the early sedimentary period of Member 3 of Shahejie Formation and 6 kinds during the middle sedimentary period of Member 3 to the early sedimentary period of Member 2 of Shahejie Formation. The comprehensive analyses on depositional environments and geochemical features show that favorable sedimentary facies belts for source rocks bearing are mainly influenced by the palaeo-lacustrine features, water depth and sediments supply. |
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| Keywords: | Dongying Sag source rocks lacustrine basin evolution Paleogene Shahejie Formation sedimentary facies favorable sedimentary facies belt for source rocks abounding |
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