| 东营凹陷南缓坡浅水三角洲沉积特征与源-汇过程 |
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| 引用本文： | 秦祎,朱世发,朱筱敏,贾光华,唐东,陈涛,张维,高子颉.东营凹陷南缓坡浅水三角洲沉积特征与源-汇过程[J].地球科学,2017,42(11):2081-2094. |
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| 作者姓名： | 秦祎 朱世发 朱筱敏 贾光华 唐东 陈涛 张维 高子颉 |
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| 作者单位： | 1.中国石油大学地球科学学院, 北京 102249 |
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| 基金项目： | 国家科技重大专项2017ZX05001-002胜利油田科研项目30200018-16-ZC0613-0005 |
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| 摘 要： | 源-汇系统研究是当今地质学研究热点.东营凹陷南缓坡沙二段沉积时期是构造稳定的斜坡带，与其物源区广饶凸起构成完整的源-汇系统.基于岩心、测井、分析化验及三维地震资料，精细刻画研究区古地貌形态及沉积物搬运通道，明确沙二段浅水辫状河三角洲沉积特征；通过地震属性与钻井岩性标定，明确沉积体系分布及时空演化关系，探讨沉积主控因素及源-汇体系配置关系.结果表明，物源区自西向东发育i~iii三个汇水单元，及V1~V4四个古沟谷，碎屑沉积物通过古沟谷搬运输送，向滨-浅湖沉积环境的缓坡（0.52°~1.29°）沉积区供源，形成平面上河道频繁分叉改道、垂向上多个正韵律叠置、岩性以分选中等、磨圆较好的含砾砂岩为主的浅水辫状河三角洲沉积.自沙二下亚段沉积期到沙二上亚段沉积期，沉积体向前推进，规模增大，沉积体系垂向演化主要受控于古气候变化导致的湖平面升降.平面上，Ⅰ~Ⅲ沉积区内朵叶体形态及规模受控于源区汇水单元面积、垂向高差及通道形态与规模，朵叶体面积与垂向高差及汇水单元面积呈正相关.
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| 关 键 词： | 浅水三角洲 古地貌 源-汇系统 地震属性 沉积 东营凹陷 石油地质 |
| 收稿时间： | 2017-05-15 |
Shallow Water Delta Sedimentation and Source-to-Sink Process in the South Slope Belt,Dongying Sag |
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| Abstract: | The study of Source-to-Sink system is a hot topic in geology research. During the sedimentary period of the second member of the Shahejie Formation (Es2), the structural stable south slope belt in the Dongying sag and its source area Guangrao uplift constituted a complete Source-to-Sink system. In this study, we analyze the paleogeomorphy, the characteristics of sediment transfer pathways and the braided shallow-water delta depositional system based on cores, logging, analytical experiment data and 3D seismic data. This paper presents in detail the sedimentary system distribution, the spatial and temporal relationship, the dominant factor of sedimentary process and sediment-dispersal patterns of the Source-to-Sink system in study area by the seismic attribute and lithology analysis. The results show there are three (ⅰ-ⅲ) catchments, four (V1-V4) paleo-valleys from west to east in the source area. The clastic sediments supply to the deposition area, which is shore-shallow lake deposit environment gentle slope (0.52°-1.29°), by the transportation of paleo-valley. This process contributes to a moderate sorted, well rounding pebbly sandstone braided shallow-water delta system that river channel diverges frequently in the plane, several positive rhythm sediments overlay vertically. The sedimentary bodies increase from lower Es2 to upper Es2. The vertical evolution of the sedimentary system is mainly controlled by the lake-level fluctuation resulted from the paleoclimatic change. In the plane, the form and scale of the lobes body in Ⅰ-Ⅲ sedimentary area are controlled by the geomorphology vertical elevation difference of the source area, the area of the catchments, the form and scale of the pathways. It shows a positive correlation among the area of the lobes body, the vertical elevation difference and the area of the catchment. |
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