Types of Subtle Buried-Hill Oil Reservoirs and Their Accumulation Simulation in Jizhong Depression, Bohai Bay Basin
详细信息
- 责任者：Zhao Xianzheng (PetroChina Huabei Oilfield Company ; Renqiu 062552 ; China) ; Jin Fengming
- 刊名：Petroleum Exploration and Development
- 出版年：2012
- 卷期：39(2)
- 关键词：潜山油气藏 ; buried-hill reservoir ; 隐蔽油气藏 ; subtle reservoir ; 冀中坳陷 ; Jizhong Depression
- 页码：p.137-143
- 图表：7 illus., 2 tables, 20 refs.
- 分类号：1003
- issnNo：ISSN1000-0747
- isbnNo：CN11-2360/TE
摘要
The types of subtle buried-hill resevoirs and their accumulation characteristics are analyzed based on the exploration progression of subtle buried-hill reservoirs in the Jizhong Depression in recent years. These reservoirs are classified into easily discovered buried-hill head reservoirs, and difficultly discovered buried-hill slope reservoirs and buried-hill internal reservoirs. Effective seal is the key factor for the formation of buried-hill internal reservoirs, and mountain controlling faults are the important hydrocarbon migration pathways. As for buried-hill slope reservoirs, two sealing conditions must be satisfied, including the argillaceous caprocks at the top of the unconformities and the buried-hill internal barriers at the flank, and the unconformities act as the primary migration pathways. Simulation experiments on petroleum migration and accumulation by a 2D experimental model show that the preferential charging location of hydrocarbon is determined by the charging force and the permeability ratio of transport pathways (faults or unconformities) to buried-hill reservoirs. When faults or unconformities are high-efficient transport pathways, hydrocarbon will charge the top of the buried hills preferably, thus forming buried-hill head reservoirs. If faults or unconformities are poor in permeability or they are characterized by heterogeneity, hydrocarbon will charge the internal layers or slopes of buried hills, forming buried-hill internal reserovirs or buried-hill slope reservoirs when there are high-permeability reservoirs at the internal layers or slopes of the buried hills.
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