东营凹陷东辛2-4井上新世—全新世介形类生物地层HOLOCENE AND PLIOCENE OSTRACODE BIOSTRATIGRAPHY OF WELL DONGXIN 2-4 IN THE DONGYING DEPRESSION
何青芳
摘要(Abstract):
东辛2-4井是胜利油田东营凹陷南斜坡上的一口浅层水井,全部取芯,深度0—530.10m,对628块样品进行了系统的介形类化石分析,利用介形类化石组合特征将东辛2-4井进行了地层划分,划分出17个介形类化石组合带,介形类以Ilyocypris gibba-Candoniella albicans陆相组合为主,在28.3—161.0m井段即上更新统平原组出现了海陆交替的介形类化石组合类型,海相介形类化石出现了6次,说明该时期具有6次小规模的海侵现象,海相化石为Echinocythereis dongyin gensis-Neomonoceratina dongtaiensis-Leguminocythereis hodgii组合,这为第四纪海侵提供了可靠的证据。同时将东辛2-4井与SD1和SH2井进行了海侵层的对比,为本区沉积环境变迁提供了依据。
关键词(KeyWords): 生物地层;介形类;海相;上新世;新近纪;第四纪;东营凹陷;山东
基金项目(Foundation):
作者(Author): 何青芳
DOI: 10.19839/j.cnki.dcxzz.2007.s2.011
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