摘要
运用层序地层学原理,对海拉尔盆地乌尔逊凹陷南部次凹断陷期铜钵庙组、南屯组层序格架以及内部体系域分布特征和控制因素进行了分析。结果表明,乌南次凹断陷期主要发育3个三级层序,在凹陷内每个层序体系域完整出现,其展布受坡折带控制,而在高部位则有不同程度的剥蚀现象。断陷期的水进域和高位域深湖、半深湖相暗色泥岩是乌南次凹的主要烃源岩,南一段低位域和高位域的扇三角洲前缘及辫状河三角洲前缘砂体是主要储层。这些砂体和烃源岩有效匹配是乌南次凹构造-岩性油藏的富集带,油气分布具有明显的分带性,中部坡折带是最有利的大规模油气成藏区带,南一段是构造-岩性油藏的有利聚集区,也是本区勘探的重点。
We analyzed the sequence stratigraphic framework, internal sedimentary characteristics and its controlling factors in Wunan sub-depression based on sequence stratigraphy principle. There are three third-order sequences in Wunan sub-depression during rift period. Each sequence is integrated in the sag and is denudated partially in Wudong ramp region, and the distribution range is controlled by faulted slope-break belt. Hydrocarbon source rock consists of high system tract and half deep lake facies in depressed stage. Main reservoir consists of the sand body of fan delta front and braided stream delta front which is present in high system tract or low system tract in lower part of Nantun Formation. The enriching belts of structural-lithological reservoir in Wanan sub-depression are due to the effective matching between source rock and reservoir. Hydrocarbon distribution shows zonation. The middle slope break is a main enrichment zone, and lower part of Nantun Formation is the main oil concentration area, which is a primary exploration area.
出处
《现代地质》
CAS
CSCD
北大核心
2009年第5期816-821,共6页
Geoscience
基金
中国石油天然气集团公司重点项目(2008B-0106)
关键词
乌南次凹
乌东斜坡带
层序地层
油藏类型
海拉尔盆地
Wunan sub-depression
Wudong ramp region
sequence stratigraphy
reservoir type
Hailaer Basin
