渤海湾盆地东营凹陷中央洼陷带沙三段基准面旋回变化与岩性圈闭

EVOLUTION OF BASE-LEVEL CYCLES AND LITHOLOGIC TRAPS OF THE SHA-3 MEMBER IN THE CENTRAL SAG OF THE DONGYING DEPRESSION, THE BOHAIWAN BASIN

王居峰 蔡希源 邓宏文 苏法卿

WANG Ju-feng CAI Xi-yuan DENG Hong-wen SU Fa-qing

中国地质大学, 北京, 100083 2. 中国石化, 胜利油田, 地质科学研究院, 山东, 东营, 257015 3. 中国石油化工集团公司, 北京, 100027

China University of Geosciences, Bejing 100083, China 2. Shengli Oilfield, SINOPEC, Dongying, Shandong 257015, China 3. China Petroleum and Chemical Corporation, Beijing 100027, China

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。

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.

中国石化重点科技攻关项目(P01013).

https://doi.org/10.11781/sysydz200304357