| 引用本文: | 姚玉来, 林春明, 高丽坤, 刘玉瑞, 马英俊, 李艳丽, 张霞, 张志萍.苏北盆地高邮凹陷深凹带东部古近系戴南组二段沉积相及沉积演化[J].沉积与特提斯地质,2010,(2):1-10.[点击复制] |
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| 苏北盆地高邮凹陷深凹带东部古近系戴南组二段沉积相及沉积演化 |
| 姚玉来,林春明,高丽坤,刘玉瑞,马英俊,李艳丽,张霞,张志萍 |
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(1. 南京大学地球科学与工程学院内生金属矿床成矿机制研究国家重点实验室;
2. 中石化江苏油田分公司地质科学研究院;
3. 中石化华东分公司规划设计研究院) |
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| 摘要: |
| 通过岩心观察描述和测井、录井、分析化验资料等综合分析,结合区域地质背景,对高邮凹陷深凹带东部古近系戴南组二段的沉积相类型及其分布、演化特征进行了系统研究。结果表明,戴二段发育扇三角洲、三角洲和湖泊三种沉积相类型,扇三角洲分布在南部陡坡区,三角洲分布在北部缓坡区,湖泊分布在扇三角洲、三角洲侧翼及深凹带中央地带,这种沉积格局受凹陷周边断层和古地形控制。平面上从凹陷边缘至中心,沉积相由扇三角洲相或三角洲相渐变为滨浅湖相;垂向上自下而上,沉积物粒度呈现粗-细-粗的变化规律。戴二段沉积演化可划分为初、早、中、晚和末期五个阶段。各时期的沉积特征、沉积相展布表现各异,总体表现出水体由浅变深,再次变浅,扇三角洲和三角洲先退积后进积的特点。末期湖盆整体抬升,戴二段地层顶部遭受剥蚀,与上覆地层呈不整合接触。 |
| 关键词: 高邮凹陷 戴南组二段 扇三角洲 三角洲 沉积相 沉积演化 |
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| Sedimentary facies and evolution of the second member of the Palaeogene Dainan Formation in the deep area of eastern Gaoyou depression,North Jiangsu Basin |
| YAO Yu-lai, LIN Chun-ming, GAO Li-kun, LIU Yu-rui, MA Ying-jun, LI Yan-li, ZHANG Xia, ZHANG Zhi-ping |
(1. School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, Jiangsu, China;
2. Research Institute of Geological Sciences, Jiangsu Oil Field Company, SINOPEC, Yangzhou 225009, Jiangsu, China;
3. Research Institute of Planning and Designing, East China Branch, SINOPEC, Nanjing, 210036, Jiangsu, China) |
| Abstract: |
| The present paper gives a detailed description,on the basis of cores,well logs and regional geological background,of the sedimentary facies and evolution of the second member of the Palaeogene Dainan Formation in the deep area of eastern Gaoyou depression,North Jiangsu Basin.The second member of the Dainan Formation consists of the fan delta facies,delta facies and lacustrine facies.The fan delta facies appears in the southern steep slope zone;the delta facies develops in the northern ramp zone,and the lacustrine facies is organized around the fan delta and delta facies and in the central zone of the deep area.The sedimentary framework is generally controlled by the faults and palaeotopography.From the margin to the centre of the depression,the sedimentary facies pass from the fan delta or delta facies to the littoral-shallow lacustrine facies.Vertically,there are coarse-fine-coarse gradations in the grain sizes of the sediments from bottom to top.Five stages can be distinguished for the sedimentary evolution during the deposition of the second member of the Dainan Formation.On the whole,the water bodies displayed the shallow-deep-shallow variations during these periods.The retrogradation occurred first in the fan delta and delta facies,followed by the progradation.At the latest stage,the lake basin was subjected to the uplift and erosion,which resulted in the unconformable contact with the overlying strata. |
| Key words: Gaoyou depression second member of the Dainan Formation fan delta delta sedimentary facies sedimentary evolution |
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