| 断陷湖盆差异湖侵过程与层序格架下沉积体系特征响应: 以霸县凹陷古近系沙河街组为例* |
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| 引用本文： | 张自力,朱筱敏,李琦,张锐锋,耿荣燕,曹兰柱,施瑞生.断陷湖盆差异湖侵过程与层序格架下沉积体系特征响应: 以霸县凹陷古近系沙河街组为例*[J].古地理学报,2020,22(3):440-456. |
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| 作者姓名： | 张自力 朱筱敏 李琦 张锐锋 耿荣燕 曹兰柱 施瑞生 |
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| 作者单位： | 1.中国石油大学(北京)地球科学学院,北京 102249;2.中国石油大学(北京)油气资源与探测国家重点实验室,北京 102249;3.中国地质大学(北京)海洋学院,北京 100083;4.中国石油华北油田分公司,河北任丘 062552 |
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| 基金项目： | *国家重大科技专项(编号: 2017ZX05001-002-002)和中国石油天然气股份有限公司重大科技专项(编号: 2017E-15)联合资助 |
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| 摘 要： | 断陷湖盆充填演化过程中发生的多期差异湖侵,控制了层序格架及其内部沉积体系类型和分布。基于霸县凹陷的三维地震资料,结合800口探井钻/测井、岩心及古生物等资料,在明确古近系湖盆演化过程的基础上,以沙河街组三段和一段为研究目标,分析差异湖侵作用过程中的层序结构及层序格架下的沉积差异特征。研究结果表明,沙三段沉积时期的缓慢湖侵过程中发育断坡—坡折层序结构,以多期退积型三角洲、扇三角洲沉积为主,形成厚层优质烃源岩。沙一段沉积时期的快速湖侵过程中,形成弯折—宽缓坡型层序结构样式,发育混积滩坝、小型近岸水下扇(扇三角洲)沉积。根据上述研究结果,认为断陷湖盆差异沉降控制了层序结构样式,古地貌和物源供给调节岩相的空间分布,湖盆不同演化阶段层序结构和沉积体系都存在显著的差异。在此基础上,建立差异湖侵作用下沉积体系特征的响应模型,可为同类型盆地中的油气勘探特别是岩性油气藏的勘探提供借鉴。
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| 关 键 词： | 霸县凹陷 古近系 断陷湖盆 层序格架 沉积体系 差异湖侵 |
| 收稿时间： | 2020-03-08 |
Differential transgression of rift basin and characteristic response of sedimentary system within sequence framework: An example from the Paleogene Shahejie Formation in Baxian sag,Bohai Bay Basin |
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| Zhang Zi-Li,Zhu Xiao-Min,Li Qi,Zhang Rui-Feng,Geng Rong-Yan,Cao Lan-Zhu,Shi Rui-Sheng.Differential transgression of rift basin and characteristic response of sedimentary system within sequence framework: An example from the Paleogene Shahejie Formation in Baxian sag,Bohai Bay Basin[J].Journal of Palaeogeography,2020,22(3):440-456. |
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| Authors: | Zhang Zi-Li Zhu Xiao-Min Li Qi Zhang Rui-Feng Geng Rong-Yan Cao Lan-Zhu Shi Rui-Sheng |
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| Institution: | 1.College of Geosciences, China University of Petroleum(Beijing),Beijing 102249,China;2.State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;3.School of Ocean Sciences, China University of Geosciences(Beijing),Beijing 100083,China;4.PetroChina Huabei Oilfield Company,Hebei Renqiu 062552,China |
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| Abstract: | Multi-stage differential transgression controls sequence architecture and its sedimentary type and distribution during the tectonic evolution of lacustrine rift basin. Combined with the seismic data of the Baxian sag as well as drilling,logging,core and paleontological materials from 800 exploration wells,the study targeted the Members 1 and 3 of the Shahejie Formation to analyze sequence architecture and sedimentological difference within the sequence framework during the differential lake transgression,based on the investigation of the Paleogene lake basin evolution. The results showed that the fault slope-break slope architecture was well developed with back-stepping deltas and fan deltas during the slow lake transgression of the Member 3 of Shahejie Formation,in which forms thick high quality source rocks. The flexural-gentle slope architecture was well developed with mixed beach bar and small scale nearshore subaqueous fans(fan deltas)during the rapid transgression of the Member 1 of Shahejie Formation. The differential subsidence controlled the sequence architecture,paleogeomorphology and provenance supply,regulating the spatial lithological distribution. And there are significant differences in sequence architecture and sedimentary system during the different evolution stages of the lake basin. On this basis,the response model of sedimentary system characteristics under differential lacustrine transgression is established,which can be used for reference for oil and gas exploration,especially for lithologic oil and gas reservoir in the same type of basin. |
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| Keywords: | Baxian sag Paleogene rift basin sequence architecture sedimentary system differential lake transgression |
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