Characteristics of Miocene Guangle carbonate platforms in the Xisha area and its evolution
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摘要:
南海自海底扩张以来，在南北共轭大陆边缘发育了一系列的新生代碳酸盐台地，且碳酸盐台地分布面积广、厚度巨大。中新世时期，南海西北部陆缘发育有大量的生物礁碳酸盐台地，形成了重要的油气储层。在前期对南海西北部陆缘中新世碳酸盐台地与生物礁识别研究的基础上，结合对西沙海区地震资料与区域地质资料的分析，对广乐碳酸盐台地进行了深入研究。广乐碳酸盐台地位于西沙海区广乐隆起之上，地震反射特征具有分段性特点，自早中新世开始广泛发育，在构造作用控制下，一直持续发育至晚中新世，发育过程中表现出自西向东迁移的特点，最终由于构造沉降加速和西部中南半岛的陆缘碎屑物质注入导致水体环境改变，广乐碳酸盐台地在晚中新世被淹没。
Abstract:Cenozoic carbonate platforms of huge thickness are widely distributed on the conjugate continental margins of the South China Sea. A large number of Miocene reefs and carbonate platforms, which are potential reservoirs for hydrocarbon accumulation, have been found on the northwestern margin. The Guangle carbonate platforms are located on the Guangle Uplift of the Xisha region. Based on previous studies, the latest seismic data acquired are used by this paper for study of the seismic characteristics of the carbonate platforms. An evolutionary model is then proposed to reveal the history of the Guangle carbonate platforms. The platforms started growing in Early Miocene, built up and expanded towards east in early and middle Miocene, shrank by the end of Middle Miocene, and finally submerged under sea water due to tectonic subsidence and the environmental changes caused by the input of detrital sediments since late Miocene.
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Key words:
- carbonate platform /
- platform evolution /
- tectonics /
- terrigenous detrital input /
- Xisha Islands
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http://www.irgrid.ac.cn/handle/1471x/1102890?mode=full&submit_simple=Show+full+item+record ZHANG Xinyuan. The evolution and characteristics of Miocene carbonate platforms and reefs in the Xisha area, northwestern continental margin of the South China Sea [D]. Graduate University of Chinese Academy of Sciences (Institute of Oceanography), 2016.
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