EVOLUTION OF BASE-LEVEL CYCLES AND LITHOLOGIC TRAPS OF THE SHA-3 MEMBER IN THE CENTRAL SAG OF THE DONGYING DEPRESSION, THE BOHAIWAN BASIN
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摘要: 东营凹陷中央洼陷带沙三段以三角洲和浊积岩的发育为主要特点。通过钻井和三维地震资料的综合解释,建立了沙三段高分辨率层序地层格架。将三角洲的主要发育层段沙三中亚段划分为6个短期基准面旋回,每个短期基准面旋回包含着多个较小规模的次级基准面升降旋回。岩性圈闭主要由浊积成因的砂体组成,可划分为滑塌浊积岩、坡移浊积扇和湖底扇圈闭3种类型,每种类型圈闭的形成和分布都与基准面的升降变化密切相关。湖底扇和坡移浊积扇圈闭形成于基准面上升期,是该区主要的储油圈闭;滑塌浊积岩圈闭主要形成于基准面下降期,规模相对较小,储积物性较差。该研究成果对于确定浊积岩(扇)体的发育与分布规律具有重要的指导意义,可以更好地指导该区及类似地区的岩性油气藏勘探工作。Abstract: Based on study of drilling data and seismic data, the high-resolution sequence stratigraphical framework of Sha-3 member in the central sag of Dongying depression has been established. The middle member of Sha-3 can be divided into one long-term and six short-term of base level cycles. In accordance with the characteristics of the base levels and the forming mechanism of the sandbody, the lithologic traps can be divided into three types: slump turbidite trap, slope-moving turbidity fan trap and sublacustrine fan trap. The formation of traps was related to the evolution of base levels. The sub-lacustrine fan and slope-moving turbidity fan which consisted of the main reservoirs were formed during rising stage of the base level, and the slump turbidite was formed during the falling of base level.
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Key words:
- the Sha-3 Member /
- base-level cycle /
- lithologic trap /
- the Dongying Depression /
- the Bohaiwan Basin /
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