横贯黄海的中朝造山带与北、南黄海成盆成烃关系

doi:10.11743/ogg20050208

摘要/Abstract

摘要：

中国大陆边缘和西太平洋洋壳之间的黄海海域,属于过渡型地壳结构。由于受周边大地构造制约,北黄海盆地的基底属于华北地块,而南黄海盆地则属于下扬子地块,地壳结构极为复杂。由郯庐断裂平移走滑活动、苏北板块沿断裂向北的巨大推覆作用,以及鲁苏超高压变质带的切入等迹象,结合地层古生物及岩石测年为220～230Ma,表明三叠纪早期,华北地块与下扬子地块发生碰撞,形成横贯于黄海中部的中朝造山带。该带由苏胶造山带-千里岩隆起带-临津江造山带组成,西宽东窄形似楔状,整体呈北东东向。中侏罗世以后,由于造山带的再度隆起导致两侧的北、南黄海产生裂陷,而开始沉积上侏罗统和白垩系。北黄海盆地蕴藏着两套含油气系统,其中,以深湖或半深湖相沉积的上侏罗统是盆地内主要烃源岩,上侏罗统及下白垩统砂岩和砂质砾岩为良好储层构成的含油气系统,已得到606井等产油井的证实;以第三系沼泽相煤系为烃源层,第三系硅质碎屑岩为储层的含油气系统,应重视天然气的勘探。南黄海盆地进一步划分为北部坳陷、中部隆起区及南部坳陷。南、北部坳陷的烃源岩主要为下第三系阜宁组及戴南组,其次,泰州组上段和浦口组为可能的烃源岩。中部隆起由于长期处于隆升状态,缺失中生代和早第三纪沉积,中部隆起应加强下古生界油气勘探,有望在深部发现志留-泥盆系高产天然气藏。

关键词: 中朝造山带, 成盆成烃, 含油气系统, 化石

Abstract:

Yellow Sea area, located between the margin of China's mainland and the oceanic crust of the Western Pacific Ocean, has transitional crustal structure. Being controlled by the surrounding tectonics, the basement in North Yellow Sea basin is of the North China landmass, while that in South Yellow Sea basin is of the Lower Yangtze landmass, as a result, the crustal structure is very complicated. Based on the strike-slip movement of Tancheng-Lujiang fracture, massive northward overthrusting of North Jiangsu plate along the fracture and the cut-in of Shandong-Jiangsu ultra-high pressured metamorphic zone, and in combination with stratigraphic paleontologic study and dating of rock to be 220～230 Ma, it is believed that North China landmass would have collided with the Lower Yangtze landmass in early Triassic, leading to the formation of Sino-Korean orogenic belt traversing the middle of Yellow Sea. The NEE trending Sino-Korean orogenic belt, with a wedge shape being wide in the west and narrow in the east, is composed of Sujiao orogenic zone, Qianliyan uplift zone and Linjinjiang orogenic zone. Since Middle Jurassic, the re-uplifting of the orogenic belt resulted in the rifting and subsiding of the North and South Yellow Sea basins and deposition of Upper Jurassic and Cretaceous strata. There are two petroleum systems in North Yellow Sea basin. The first one, with the Upper Jurassic deep or semi-deep lacustrine sediment to be the major source rocks and the Upper Jurassic and Lower Cretaceous sandstones and sandy conglomerate to be the good reservoirs, has been verified by well producing wells,such as the.606 well. While the second one, with the Tertiary paludal coal measures to be the source rocks and the Tertiary siliceous clastic rocks to be the reservoirs, has gas potentials. South Yellow Sea basin can further be subdivided into northern depression, middle uplift zone and southern depression. In the southern and northern depressions, Lower Tertiary Funing and Dainan Formations are the major source rocks, and the Taizhou and Pukou formations are the possible source rocks. The Mesozoic and Lower Tertiary are absent in the middle uplift zone, since it has long been uplifting. Exploration of the Paleozoic should be strengthened in the middle uplift zone, where prolific gas reservoirs are expected to be discovered in Silurian-Devonian.

Key words: Sino-Korean orogenic belt, basin evolution and hydrocarbon generation, petroleum system, first discovery of fossil

中图分类号:

TE111.2

蔡乾忠. 横贯黄海的中朝造山带与北、南黄海成盆成烃关系[J]. 石油与天然气地质, 2005, 26(2): 185-192,196. doi: 10.11743/ogg20050208 Cai Qianzhong. Relationship between Sino-Korean orogenic belt traversing Yellow Sea and basin evolution and hydrocarbon generation in North and South Yellow Sea basins[J]. Oil & Gas Geology, 2005, 26(2): 185-192,196. doi: 10.11743/ogg20050208

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