东营凹陷东辛2-4井上新世至全新世天文地层研究THE PLIOCENE-HOLOCENE ASTROSTRATIGRAPHIC STUDY OF WELL DONGXIN 2-4 IN THE DONGYING DEPRESSION
姚益民,徐道一,张海峰,韩延本,张守鹏,尹志强,何青芳,边雪梅
摘要(Abstract)：
东辛2-4井钻取岩芯0—530.1m,明化镇组上段的上亚段至平原组划分为18个层,其中,下更新统平原组一段(简称平一段)的底作为第四系下界;同时进行了古地磁研究,测定出布容、松山、高斯和吉尔伯特等4个极性时。由于天文地层研究的需要,对90年代古地磁的年龄与"国际地层表"(2004)对比,作了相应调整,确定井深242.5m处的年龄为781ka,274.5m处的为2581ka,452.0m处的为3596ka和529.5m处的为4493ka,井深242.5m和452.0m这两个界线的年龄值作为天文地层计时的标定。研究大致分为两步:①以磁化强度(MI)数值曲线的频谱和小波分析,选定平原组一段102.4m周期和明化镇组上段68.36m周期分别对应于天文偏心率404ka旋回,求出了堆积速率为0.1584mm/a和0.1692mm/a及其他各层位的年龄:井深274.5m处上新统明上(上)亚段顶界的年龄为2546ka,平一段底界的年龄是970ka,不整合的延续时间大约为1.6Myr。②推测明上(上)亚段顶2546—1806ka期间可能沉积了129m地层;而在1806—908ka期间,由于构造活动上升,把原沉积又剥蚀掉了,形成井深274.5m处的一个大的不整合面,对储层孔隙的扩张和压实有重要影响,成为最后二次烃源物质的卸载和封堵。
关键词(KeyWords)： 磁性地层;沉积速率;天文地层;上新统;全新统;东营凹陷;山东
基金项目(Foundation): 中石化“东营凹陷成烃成藏定量研究”课题;; 国家自然科学主任基金项目(No40542007)资助
作者(Author): 姚益民,徐道一,张海峰,韩延本,张守鹏,尹志强,何青芳,边雪梅
DOI: 10.19839/j.cnki.dcxzz.2007.s2.006
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