摘要
在分析青东凹陷构造、地层和沉积特征的基础上,探讨了该凹陷的成藏条件,认为受沂沭断裂带活动和东营运动的影响,青东凹陷形成东断西超、洼垒相间的构造格局。青东凹陷烃源岩有机质丰度高,母质类型为Ⅰ—Ⅱ1干酪根且处于低成熟—成熟阶段,具有较大的资源潜力。古近系沙河街组表现为砂泥频繁间互的特征,可以形成"自生、自储、自盖"的生储盖组合类型。由于青东凹陷构造分割性很强,主要断层晚期活动弱,生、排烃期均较晚,油气以侧向近距离运移为主,临近深洼陷与断层伴生的圈闭最为有利。
Pool-forming conditions in Qingdong Sag is discussed on the basis of analysis on structure,formation and deposition.Structural framework in Qingdong Sag is fault subsidence in the east and overlap in the west,and depression alternates with uplift because of the effect of Yi-Shu fault belt activity and Dongying movement.Resource abundance in Qingdong Sag is high owing to high organic content of oil source rock.Source material type is kerogenⅠ-Ⅱ1 and in low mature to mature stage.Paleogene Shahejie formation is interstratified between sandstone and mudstone,'self-generation,self-reservoir and self-seal' pool-forming types are common.Sideway and short distance hydrocarbon migration in Qingdong Sag is main with strong structural segmentation,major fault activity was weak in late period and hydrocarbon generation and expulsion is late.So the traps being close to deep depressions and associated with fault are the most favorable targets for prospecting.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2009年第5期43-48,共6页
Journal of Southwest Petroleum University(Science & Technology Edition)
基金
中国石化科技攻关项目(P02002)
关键词
青东凹陷
沙河街组
成藏条件
近距离运移
勘探方向
Qingdong Sag
Shahejie Formation
Pool-forming conditions
short-distance migration
prospecting target
