Geometric characteristics and evolution of channel-levee system in Upper India Fan since the Miocene
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摘要:
以中新世以来上印度扇水道−堤岸体系为研究对象，利用高精度二维地震资料开展地震精细解释与几何学分析，刻画水道−堤岸体系几何学特征及时空演化过程，探讨中新世以来上印度扇发育演化主要期次及特征。结果表明，中新世以来上印度扇水道−堤岸体系可划分为中新世、上新世及更新世至今三大期次，整体表现出“单期水道-侧向迁移-扁长型”到“多期水道-垂向叠置-厚窄型”的演化特征。深入探讨中新世以来上印度扇水道−堤岸体系的几何学特征及演化可为重力流水道的沉积构型样式研究提供新的例证，并为深海油气勘探开发提供参考。
Abstract:Taking the Miocene Upper Indian fan channel-levee system as the research object, we used high-precision two-dimensional seismic data to carry out seismic fine interpretation and geometric analysis, depicted the geometric characteristics of the channel-levee system and the spatio-temporal evolution process, and discussed the main stages and characteristics of the development and evolution of the Miocene Upper Indian fan. Results show that the Miocene Upper India fan channel-levee system can be divided into three developmental phases: the Miocene, the Pliocene, and the Pleistocene to present. The channel-levee system evolved from “single-phase channel–lateral migration–flat type” to “multi-phase channel–vertical stacking–thick-narrow type”.An in-depth discussion of the geometric characteristics and evolution of channel-levee system in Upper India Fan since the Miocene can provide new examples for the study of the sedimentary architecture of gravity flow channels, and provide reference for deep-sea oil and gas exploration and development.
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Key words:
- deep water deposit /
- channel-levee system /
- Miocene /
- Upper Indian Fan
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表 1 中新世以来水道−堤岸体系平均宽度、平均厚度、平均宽厚比
Table 1. The average width, thickness, and width-thickness ratio of the channel-levee system since the Miocene
平均宽度/m 平均厚度/m 平均宽厚比 近端 中端 远端 近端 中端 远端 近端 中端 远端 更新世至今 5328 19087 13003 547 738 524 9.9 24.7 26.2 上新世 4564 17608 11734 438 571 559 12.3 33.3 22.0 中新世 10520 19755 14182 629 543 452 16.1 37.8 35.2 
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