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沉积学报  2015 

北黄海盆地东部坳陷中生界沉积特征及演化

DOI: 10.14027/j.cnki.cjxb.2015.03.014, PP. 561-567

Keywords: 北黄海盆地,东部坳陷,中生界,沉积相,沉积演化

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Abstract:

北黄海盆地是我国近海勘探及研究程度均较低的中新生代叠合断陷盆地,而东部坳陷是其内最具油气勘探前景的二级构造单元。通过岩芯观察与测井相分析,结合三维地震资料,认为东部坳陷中生界主要发育扇三角洲、辫状河三角洲、三角洲与湖泊沉积。受构造演化阶段的制约,不同时期具有不同的沉积演化特征。其中中侏罗世处于湖盆的初期断陷期,半深湖—深湖亚相发育,仅在坳陷边缘见少量小规模的扇三角洲沉积。晚侏罗世处于断陷扩展期,整体为一个完整的湖进—湖退旋回,早期北部缓坡发育三角洲沉积,南部及东部陡坡见扇三角洲沉积,中后期则由于湖平面上升,发育暗色泥岩为主的湖泊沉积,晚期北部缓坡见小规模三角洲前缘沉积。早白垩世处于断陷萎缩期,垂向发育2个正旋回沉积序列,其中旋回下部以扇三角洲、辫状河三角洲相为主,向上渐变为滨浅湖沉积。

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