上扬子区中新生代构造变形与海相油气分布
Meso-Cenozoic Structural Deformation and Marine Gas Distribution of Upper-Yangtze Block in Southern China
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摘要: 据重力航磁异常、中新生代构造演化及浅层变形特点,探讨了上扬子地区海相碳酸盐岩层系构造变形的区域不均一性,及其对海相油气分布的控制。研究表明,四川盆地及其周缘褶冲带在不同构造体制下发育了不同的构造样式,圈闭演化的差异性决定了晚期天然气的聚集与散失。其中,川西前陆扩展变形带隐伏断层及牵引背斜组合对海相油气聚集较为有利,川中南古背斜后期继承性演化、调整形成次生气藏,川东及川东北一带中构造层(包括上古生界和中、下三叠统)内断层及其相关褶皱发育,隐伏背斜为大型天然气成藏提供圈闭条件,湘西武陵地区除桑植-石门、花果坪等复向斜外,海相油气勘探难度大。Abstract: On the basis of studying surface deformational characteristics,seismic section and basement properties,we discuss on spatiotemporal differences of structural deformation of marine carbonate layer series in different parties of upper-Yangtze block since Indo-China movement.The results show that multi-period superimposed movements control the processes of late natural gas accumulation.The buried faults and dragged anticline located in the front of fold-thrust belt is favorable relatively for marine hydrocarbon accumulation in western Sichuan;the continuation and local adjustment of paleoanticline of central Sichuan zone formed secondary gas reservoirs;a lot of faults and related folds grow in middle structural layer of eastern Sichuan zone,its hidden folds provides traps conditions to large gas reservoirs;excerpts for Sangzhi-Shimen synclinorium,it is very difficult to explore marine hydrocarbon in western Hunan.
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Key words:
- upper-Yangtze block /
- marine layer series /
- marine hydrocarbon /
- Sichuan basin /
- gliding structure /
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