Influence of pre-Paleogene tectonics on Upper Paleozoic-Mesozoic source rocks in Bohai Sea area
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摘要: 渤海湾盆地渤海海域区前古近系可划分为5个构造层,通过分析石炭—二叠系及中生界地层分布,认为渤海海域区地层分布与渤海湾盆地演化有很大关系,具有明显的阶段性和继承性。晚古生代受北部兴蒙洋活动大陆边缘俯冲造山的影响(海西运动)以及多次的海侵作用,造成该区烃源岩发育从北向南逐渐变好;晚古生代末—三叠纪,由于印支运动的影响,烃源岩不是很发育;中生代的燕山运动,该区形成了大量的内陆坳陷湖盆沉积,湖盆中心区形成了大量的优质烃源岩。Abstract: The Bohai Sea area can be divided into 5 structural layers. The distribution of Carboniferous, Permian and Mesozoic strata was studied, indicating for close relationship between stratigraphic distribution and basin evolution. Due to the subduction of the continental margin orogeny of the northern Xingmeng ocean activities in the Late Paleozoic (the Hercynian Movement), and influenced by a number of transgression, source rocks became better from north to south gradually. From the Late Paleozoic to Triassic, source rocks became worse because of the Indosinian Movement. The Yanshan Movement during Mesozoic resulted in a large number of inland warped lake deposition in the area and excellent source rocks of large quantity generated in the center of lake basin.
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Key words:
- source rock /
- Upper Paleozoic /
- Mesozoic /
- tectonic evolution /
- pre-Paleogene /
- Bohai Bay Basin
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