摘要
针对东濮凹陷方里集地区沙河街组烃源岩地球化学特征不明和油源认识不清的问题,应用有机地球化学方法对比分析了不同层段烃源岩有机质丰度、类型、成熟度和沉积环境特征,明确了不同油藏的石油来源。研究结果表明,方里集地区Es_3~2烃源岩有机质丰度中等—高,干酪根类型为II—III型,处于成熟—高熟阶段,是有效的烃源岩,而Es_1~2和Es_3~1烃源岩均难以大量生烃;沙河街组烃源岩沉积于还原—弱氧化环境,Es_1~2和Es_3~1烃源岩沉积于淡水—咸水环境,Es_3~2为淡水—微咸水环境。方里集地区油藏为自生自储型,其中Es_3~2下部原油来源于Es_3~2下部烃源岩,Es_3~1及Es_3~2上部原油主要来源于Es_3~2上部烃源岩。
The geochemical characteristics of Shahejie Formation source rocks in Fangliji area,Dongpu sag,is not clarified and the origin of hydrocarbons is not determined.With organic geochemical method,based on comparison analysis of organic matter content,type,maturity and depositional environment characteristics of sources rocks from different layers,oil sources of different reservoirs are clarified.The results show that the source rocks of Es_3~2 with medium to high organic matter abundance,type II and III dominated kerogen type and middle to high mature stage are most effective,while the source rocks of Es_1~2 and Es_3~1 with limited hydrocarbon generation potential are less effective.The source rocks in Shahejie Formation are deposited in reducing to weakly oxidizing environments.The source rocks in Es_1~2 and Es_3~1 are mainly deposited in fresh to brackish water environments,while the depositional environment of source rocks in Es_3~2 tends to be fresh to weakly brackish water environments.The reservoir in Fangliji area is self-generating and self-preserving,the oil in the bottom of Es_3~2 mainly originates from the source rocks in the bottom of Es_3~2,while the oil in Es31 and the top of Es_3~2 is mainly from the source rocks in the top of Es_3~2.
出处
《中国海上油气》
CAS
CSCD
北大核心
2017年第6期53-60,共8页
China Offshore Oil and Gas
基金
国家自然科学基金项目"致密砂岩微米-纳米孔喉系统石油充注的有效性及其成藏效应(编号:41472114)"部分研究成果
关键词
东濮凹陷
方里集地区
沙河街组
地球化学特征
油源对比
Dongpu sag
Fangliji area
Shahejie Formation
geochemical characteristics
oil-source correlation
