苏北下第三系源岩“浅”熟的构造背景  

STRUCTURAL SETTING FOR "SHALLOW" MATURATION OF THE LOWER TERTIARY SOURCE ROCKS IN SUBEI BASIN, CHINA

作　　者：陈安定[1] 

机构地区：[1]江苏石油勘探局地质科学研究院

出　　处：《石油勘探与开发》1996年第4期6-10,共5页Petroleum Exploration and Development

摘　　要：在苏北盆地金湖、高邮和洪泽凹陷，地处斜坡或隆起部位的下第三系源岩，程度不同地存在＂浅＂熟现象。＂浅＂熟区源岩的地球化学异常和磷灰石裂变径迹资料及古埋深恢复表明，其源岩经过渐新世以褶皱抬升为主的改造后，今埋深小于古埋深。本文探讨了苏北箕状断陷的成因机制和演化史，及其对成油地质条件的控制作用。In the Lower Tertiary source rocks of the Jinhu, Gaoyou and Hongze sags, there exists the so-called 'shallow' maturation at the slope or uplifted positions of the sags. The geochemical anomaly, fission-track analysis and the restoration of paleo-burried depth of the source rocks in the 'shallow' matured regions indicate that the present-day buried depth is smaller than the paleo-burried depth of the source rocks after undergoing the Oligocene reworking dominated by folding and uplifting. This paper discusses the origin and evolution of the Subei (north Jiangsu) half-graben fault depression and its control over the geological conditions for oil generation.

关 键 词：苏北盆地 生油层 埋藏史 断陷 构造演化 

分 类 号：P618.130.1[天文地球—矿床学] P542[天文地球—地质学]