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西沙海区碳酸盐岩台地地震反射特征及沉积模式
Seismic Characteristics and Depositional Model of Carbonate Platforms in Xisha Area Sea Area
投稿时间:2009-12-01  修订日期:2010-04-26
DOI:
中文关键词:  西沙海区 生物礁 碳酸盐台地 深水油气 沉积模式
英文关键词:Xisha Area, Reef, Carbonate platform, Deepwater hydrocarbon, Depositional model
基金项目:国家重点基础研究发展计划(973计划)
作者单位邮编
马玉波* 中国科学院海洋研究所 266071
吴时国 中国科学院海洋研究所 
姚根顺 中国石油杭州杭州地质研究院 
吕福亮 中国石油杭州杭州地质研究院 
董冬冬 中国科学院海洋研究所 
赵撼霆 中国科学院海洋研究所 
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中文摘要:
      随着南海海盆的持续扩张,西沙海区整体沉降,早中新世开始,西沙碳酸盐台地开始发育,且在台地之上发育有不同类型的生物礁。作者通过地震识别认为,西沙海区生物礁在地震剖面上表现为顶底强振幅、丘形连续反射、内部弱振幅杂乱反射;碳酸盐台地表现为顶部强振幅连续平行反射、底部界面局部模糊,内部强弱相间亚平行连续反射。本文通过对西沙海区地层层序的分析以及大量地震资料的解释认为,西沙碳酸盐台地的发育早期受到基底构造的控制,而后期主要受多期海平面变化的影响,其发育演化经历了初始生长-加积-出露-二次生长-淹没等一系列阶段,复杂的演化过程也使得西沙碳酸盐岩具有较好的储集条件和油气远景。
英文摘要:
      Xisha Area subsided along with the sea floor spreading of South China Sea, carbonate platform and different types of reef began developed from Early Miocene in this area. Based on seismic analysis, reefs in Xisha Area show high-amplitude moundy continuous reflection at the top and bottom, chaotic reflection inside the reef, carbonate platform show high-amplitude continuous sub-parallel reflection at the top and partly obscure bottom boundary, the internal reflection show high-amplitude reflection interbedded with weak-amplitude reflection. Based on stratigraphic sequence analysis in Xisha Area and the seismic interpretation, this paper figured that development of Xisha carbonate platforms were mainly controlled by the basement structure at the early stage and then mainly be controlled by the relative sea-level fluctuation, so Xisha carbonate platforms experienced several development stages such as initial establishment stage, aggradation stage, exposure stage and flooding stage. The complicated develop process make the carbonate reservoir have favorable reservoir properties and hydrocarbon potential.
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