Paleozoic basin prototype evolution and source rock development in the South Yellow Sea
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摘要: 钻井及露头证实下扬子陆区发育下寒武统幕府山组、上奥陶统五峰组—下志留统高家边组、二叠系3套烃源岩。盆地发育时期的动力学环境决定该时期的盆地原型,盆地原型影响盆内岩相及烃源岩展布。幕府山组沉积时期,南黄海盆地表现为张裂背景下的被动陆缘克拉通盆地,盆地相及深水陆棚相呈环带状围绕古隆起或台地发育,为烃源岩发育优势相带,推测南黄海盆地中部隆起及北部幕府山组烃源岩发育较好;五峰组—高家边组沉积时期,南黄海盆地表现为挤压背景下的前陆盆地,盆地相、斜坡相、深水陆棚相由西北向东南依次呈条带状分布,盆地相、深水陆棚相为烃源岩发育优势相带,预测五峰组—高家边组烃源岩主要在南黄海地区中北部发育且有一定厚度;上二叠统龙潭组沉积时期,南黄海盆地表现为挤压背景下的活动大陆边缘坳陷型盆地,在该盆地中各沉积相带呈环带状分布,三角洲相、潮坪相、沼泽相为烃源岩发育优势相带,发育龙潭组品质中等—好的烃源岩;预测龙潭组烃源岩在南黄海盆地中部发育,是南黄海盆地古生界的次要烃源岩。Abstract: Drill samples and outcrops confirmed that three sets of source rocks developed in the Lower Yangtze Block area, namely, the Lower Cambrian Mufushan Formation, the Upper Ordovician Wufeng Formation-the Lower Silurian Gaojiabian Formation, and the Permian. This tectonic environment determined the evolution of the basin, which then affected the distribution of lithofacies and source rocks. During the deposition of the Lower Cambrian Mufushan Formation, the South Yellow Sea Basin was a passive continental cratonic margin basin undergoing regional extension. The basin facies and deep-water shelf facies developed around the paleo-uplift or platform, which were the dominant facies for the development of source rocks. It was predicted that this set of source rock developed well in the Middle Uplift and the northern part of the South Yellow Sea Basin. During the depositing of Wufeng and Gaojiabian formations, the South Yellow Sea Basin was a compressional foreland basin. The basin facies, slope facies and deep-water shelf facies were distributed in strips from the northwest to the southeast of Lower Yangtze area. The basin facies and deep-water shelf facies were dominant facies in which source rocks developed well. It was predicted that the source rocks of Wufeng-Gaojiabian formations were distributed mainly in the middle and north part of the South Yellow Sea Basin. During the deposition of the Upper Permian Longtan Formation, the South Yellow Sea Basin experienced active continental margin convergence. The sedimentary facies in the basin were scattered in ring belts. Delta and tidal flat facies were dominant with moderate to good quality source rocks. It was predicted that the source rocks of the Longtan Formation developed in the middle part of the South Yellow Sea Basin, which was the secondary source rock of Paleozoic in the South Yellow Sea Basin.
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Key words:
- source rock /
- lithofacies and paleogeography /
- basin prototype /
- South Yellow Sea Basin
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表 1 下扬子—南黄海下寒武统幕府山组烃源岩厚度
Table 1. Source rock thickness of Lower Cambrian Mufushan Formation, Lower Yangtze and South Yellow Sea
样品点 烃源岩厚度/m 暗色泥岩厚度/m 盱眙GuanD1 93 442 泰州SD121 120 368 宣城W2 465 淮安NC1 46 南京幕府山露头 50~300 Q087 78 D002 111 -
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