The response of the Indosinian Movement to the South Yellow Sea basin and its influence on the hydrocarbon geological conditions
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摘要:
南黄海盆地位于扬子地块东缘,占据了下扬子地块的主体,其构造演化过程可与中—上扬子区类比。南黄海盆地自震旦纪以来,经历了多期构造演化过程,其中印支运动在盆地的定型及改造过程中起到了至关重要的作用,但印支运动在盆地不同部位的构造响应特征及其油气地质意义并不明确。依据南黄海盆地多年的研究成果,结合最新区域地震、钻井等资料,认为印支运动在南黄海盆地不同区域具有不同的构造表现。盆地中部崂山隆起受印支运动影响最弱,之后拉伸构造反转作用也相对最弱,南部青岛坳陷次之,而北部烟台坳陷受印支运动影响最强烈。从油气地质条件看,印支运动对不同期次油气藏具有不同影响,对下古生界油气藏具有调整改造作用,对于上古生界的圈闭具有定型作用。印支运动断裂系统对深部油气的疏导、储层裂缝的发育具有积极意义。
Abstract:The South Yellow Sea basin is located at the eastern margin of Yangtze Platform and dominated the Lower Block, whose tectonic evolution can be correlated with Middle-Upper Yangtze region.The South Yellow Sea basin had suffered several tectonic evolution phases since Sinian, of which the Indosinian Movement had played a key role in basin formation and modification.However, the tectonic response of the Indosinian Movement to different parts of the basin and its petroleum geological significance are not clear.Based on the research results of the South Yellow Sea Basin for many years, combined with new regional seismic and drilling data, it is concluded that the Indosinian Movement had different tectonic manifestations in different regions of the South Yellow Sea Basin.The Laoshan uplift in the middle of the basin was the least affected, and the subsequent tension inversion was also relatively weak.While, the Yantai depression in the north was the most strongly affected by the Indosinian Movement, followed by the Qingdao depression in the south.As to geological conditions of hydrocarbon mineralization, it had different effects on the sub-reservoirs of different periods.Which had modified the oil and gas reservoir in the Lower Paleozoic and finalized ones in the Upper Paleozoic.The fault system has also positive significance for the drainage of deep hydrocarbon and the development of reservoir fissure.
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