| 沙垒田凸起前古近系基岩分布及源—汇过程 |
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| 引用本文： | 刘强虎,朱筱敏,李顺利,李慧勇,石文龙.沙垒田凸起前古近系基岩分布及源—汇过程[J].地球科学,2016,41(11):1935-1949. |
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| 作者姓名： | 刘强虎 朱筱敏 李顺利 李慧勇 石文龙 |
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| 作者单位： | 1.中国石油大学油气资源与探测国家重点实验室，北京 102249 |
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| 基金项目： | 国家自然科学基金项目41272133 |
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| 摘 要： | 沙垒田凸起及围区凹陷是一个完整的源-汇系统.基于钻井岩心、三维地震及锆石测年等资料，刻画了沙垒田凸起前古近系基岩组成及分布并探讨了古近纪早期源-汇体系配置关系.研究表明，沙垒田凸起自南向北依次发育太古界-元古界混合花岗岩、奥陶-寒武系碳酸盐岩与碎屑岩、中生界火山碎屑岩；其中，凸起东段以元古代混合花岗岩为主，西段以奥陶-寒武系碳酸盐岩为主.结合古地貌可知，砂岩富集区与源-汇耦合系统相对应，即基岩组成、汇水区、物源通道及边界样式共同控制沉积砂体组成样式与规模.对比分析凸起东西段、南北侧各控制要素与沉积砂体间关联性，可知凸起东段南侧混合花岗岩基底、较大的汇水面积与物源通道及斜坡带对应高效源-汇系统.
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| 关 键 词： | 基岩 源-汇体系 锆石定年 古地貌 沙垒田凸起 沉积学 |
| 收稿时间： | 2016-05-23 |
Pre-Palaeogene Bedrock Distribution and Source-to-Sink System Analysis in the Shaleitian Uplift |
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| Abstract: | During the early stage of the Palaeogene, the Shaleitian uplift and its surrounding areas constituted a complete source-to-sink system. In this paper, we analysze the characteristics of Pre-Palaeogene bedrocks and sediment-dispersal patterns of the source-to-sink systems based on detritus, thin section, zircon and integrated seismic-logging data analysis. The results show that the Shaleitian uplift was filled by Archeozoic and Proterozoic metamorphic rock sediments, and Lower Palaeozoic carbonate rocks stacked with southward Mesozoic igneous rocks. The bedrocks mainly consist of Proterozoic metamorphic rocks in the southern part of eastern Shaleitian uplift, while the Lower Palaeozoic carbonate rocks in the northern part of western Shaleitian uplift. Based on the palaeogeomorphology, it is found a sand-rich area corresponds to a complete source-to-sink coupling system in the rift basin, and the stacked style and size of sandbodies in the sink are jointly controlled by the composition of bedrocks, catchment areas, sediment-transport pathways, fracture system and detritus accommodation space. It is concluded thateffective source-to-sink systems are mainly located in the southern part of the eastern Shaleitian uplift through comparative analysis of the coupling relationship among the various controls with sandbodies properties in the Shaleitian uplift and surrounding areas. |
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