摘要
分析海塔盆地中部主要断陷带南二段油气分布及其与成藏条件之间时空匹配关系,研究油气富集成因及主控因素.结果表明:南二段油气分布存在2种形式:一种与上覆大磨拐河组伴生;另一种仅分布在南二段.前者为晚期反转成因,在青元岗组沉积时期,由于构造反转形成于下伏南一段源岩生成的油气沿长期断裂向南二段运移并聚集;后者为早期侧接成因,形成于早期伸展断裂使其上盘南二段与下盘南一段源岩侧接,南一段源岩生成的油气在伊敏组沉积末期向对盘南二段运移聚集.晚期反转成因油气的形成受到3方面因素控制:①源岩区控制晚期反转成因油气聚集与分布;②反转构造及其附近是反转成因油气聚集的有利部位;③长期发育断裂为晚期反转成因油气形成提供输导通道.南二段侧接成因油气聚集受到3方面因素控制:①源岩区控制早期侧接成因油气聚集与分布;②反向断裂上盘是早期侧接成因油气聚集的有利部位;③早期伸展断裂为早期侧接成因油气聚集提供遮挡条件.
By the study of oil and gas distribution and relation between it and oil and gas accumulation conditions,formation causes and main controlling factors of oil and gas accumulation were studied,it is considered that there are two forms of oil distribution in K1n2,one is oil of K1n2 which is together with oil of K1d,another is oil only distributing in K1n2,the former was formed by reversion,it was formed in faulted traps of K1n2 by oil of K1n1 migrating through long-period developing faults because of tectonic reversion in the K1q sedimentary period.The latter is formed by lateral touch,it was formed in faulted traps of K1n2 by oil of K1n1 migrating into opposite block because of lateral touch of K1n1 sourcerock and K1n2 reservoir in the end of K1y sedimentary period.Oil and gas accumulation formed by reversion in later period was controlled by following factors:①Distribution of sourcerock controls oil and gas accumulation and distribution of oil reservoirs formed by reversion in later period.② Reversion structures and their surrounding areas are favorable places for oil and gas accumulation formed by reversion in later period.③Long-period developing faults provide transporting pathways for oil and gas accumulation formed by reversion in later period.Oil and gas accumulation by lateral touch in early period was controlled by following factors:① Distribution of sourcerock controlled oil and accumulation and distribution by lateral touch in early period.② Upper blocks of transoid faults are favorable places for oil and gas accumulation by lateral touch in early period.③Early-expanding faults provide sealing condition for oil and gas accumulation by lateral touch in early period.
出处
《大庆石油学院学报》
CAS
北大核心
2012年第3期41-45,85,共6页
Journal of Daqing Petroleum Institute
基金
国家973重大基础研究项目(2001CB209104)
关键词
油气分布形式
形成机制
主控因素
反转成因
侧接成因
南二段
海塔盆地
oil distribution pattern
formation causes
main controlling factors
reversal formation
lateral touch
K1n2
Haita Basin
