摘要
由于拉张和扭动作用 ,苏北盆地构造圈闭主要为断鼻断块。依其成因可将构造圈闭划分为 4类 :Ⅰ类 ,凹陷及斜坡地区的断鼻断块群 ;Ⅱ类 ,主控断裂两侧的断块 ;Ⅲ类 ,主控断层扭动转换部位的断鼻断块 ;Ⅳ类 ,断阶带之间的复杂断块。根据构造圈闭成因类型、油气源及油气聚集途径等组合特征的分析 ,将成藏样式总结为 3大类 6亚类 :由Ⅰ类圈闭形成的原生油藏及次生油藏 (a ,b型 ) ,由Ⅱ ,Ⅲ类圈闭形成的断层输导型及储层输导型油气藏 (c ,d ,e型 ) ,由Ⅳ类圈闭形成的f型油气藏。目前在苏北盆地两个主力凹陷———高邮凹陷和金湖凹陷 ,所发现的油气藏类型以a ,b类占主导地位 ,分布在凹陷斜坡地区 ,其次为主控断裂两侧的c型油气藏。另外在高邮凹陷南部断阶带内部发育一些f型油气藏。
Structural traps in Subei basin consist mainly of faulted noses and blocks. According to their origin or having resulted from extension and wrench movements, the structural traps in the basin can be divided into four types,including: typeⅠ,group of faulted noses and blocks that occur in the sag and on its slope one; typeⅡ,faulted blocks developed on both sides of major faults; type Ⅲ, faulted noses and blocks developed on the shearing and transforming position of major faults;and type Ⅳ, complicated faulted blocks that occur between fault-terrace belts. By analyzing the genetic types of structural traps and characteristics of oil sources and pathways of oil migration and accumulation, the reservoiring patterns can be divided into three major types and six subtypes,,i.e (1) primary and secondary reservoirs (subtype a and b) formed mainly typeⅠtraps;(2) subtypes c,d and e reservoirs formed in typeⅡand type Ⅲ traps and migrated either through faults or reservoir rocks;(3) subtype f reservoirs formed in type Ⅳtraps.Presently,the gas and oil reservoirs found in Gaoyou and Jinhu sags in Subei basin are mainly of subtype a and b, which distributed on the slope areas of the sags;secondly are subtype c reservoirs that distributed on both sides of major faults.Besides,there are also some subtype f reservoirs developed within the fault terrace belt in Gaoyou sag.
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
2003年第4期371-374,共4页
Oil & Gas Geology
关键词
构造圈闭
成藏模式
断鼻断块
苏北盆地
structural traps
reservoiring patterns
faulted noses and blocks
Subei basin
