孟加拉盆地东部褶皱带差异构造变形及成因

发布时间：2018-05-12 14:17

本文选题：构造变形 + 滑脱层　；参考：《海相油气地质》2017年02期

【摘要】：基于野外地质调查和地震资料分析,证实了孟加拉盆地东部褶皱带发育底部和中部两套滑脱层。底部滑脱层在整个褶皱带均发育,而中部滑脱层仅发育于北段—中段的陆上和陆架区,在中段的陆坡-洋盆区及南段则不发育。中部滑脱层的发育受古陆坡富泥沉积控制。北段—中段主要发育滑脱褶皱及被断层突破的滑脱褶皱,而南段主要发育泥底辟和泥火山构造。孟加拉盆地东部褶皱带滑脱层系及构造样式的差异变形特征主要受区域挤压作用、沉积作用以及地层流体超压等方面存在着差异的共同影响。
[Abstract]:Based on the field geological survey and seismic data analysis, it is confirmed that two sets of slip layers are developed in the eastern fold belt of Bangladesh basin. The bottom slip layer is developed in the whole fold zone, while the central slip layer is only developed in the land and shelf areas of the northern and middle segments, but not in the continental slope-ocean basin region and the southern part of the middle segment. The development of the central detachment is controlled by the mud-rich deposits on the paleo-continental slope. The north and middle segments mainly developed slip fold and the slip fold which was broken through by fault, while the south segment mainly developed mud diapir and mud volcano structure. The differential deformation characteristics of delamination and structural styles in the fold belt in eastern Bangladesh basin are mainly influenced by regional compressibility, sedimentation and fluid overpressure.
【作者单位】：中国石油杭州地质研究院;
【基金】：中国石油天然气集团公司科学研究与技术开发项目“海外重点战略大区勘探技术研究与实践”子课题“海外海洋勘探技术与有利目标评价研究”(编号:2014D-0908)资助
【分类号】：P542.2;P618.13

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