Characteristics of Effective Source Rocks in the Jurassic and Hydrocarbon Accumulation Patterns in the Areas near the Northern Margin of the Qaidam Basin
详细信息
- 责任者：Zhai Zhiwei (Research Institute of Exploration and Development ; Qinghai Oilfield Company ; PetroChina ; Dunhuang 736202 ; China) ; Zhang Yongshu
- 刊名：Natural Gas Industry
- 出版年：2013
- 卷期：33(9)
- 关键词：烃源岩 ; source rocks ; 油气聚集 ; oil and gas accumulation ; 柴达木盆地 ; Qaidam Basin
- 页码：p.36-42
- 图表：6 illus., 2 tables, 16 refs.
- 分类号：1003
- issnNo：ISSN1000-0976
- isbnNo：CN51-1179/TE
摘要
The area near the northern margin of the Qaidam Basin has the typical characteristics of a foreland basin,and the oil/gas discoveries are mainly made in the Lenghu-Nanbaxian tectonic zone.In order to find large hydrocarbon fields there,this paper studies the characteristics of effective source rocks and hydrocarbon accumulation patterns in this study area.The effective source rocks were mapped by analyzing the geochemical behaviors of outcrops and core samples.Based on the analysis of the hydrocarbon generation potentials of major source rocks in the Lenhu-Yibei and Delinha kitchens,the Jurassic natural gas resource volume was estimated to be 490.34 billion m3.The following findings were made from the study of hydrocarbon pooling mechanisms in this study area.a.There are four reservoir-seal combinations,namely basement buried hills,the Jurassic,Paleogene,and Neogene Fms,and four source rock-reservoir combinations including source rock-reservoir being the same layer,lower source rock-upper reservoir,lower source rock-lateral upper reservoir,and source rock-reservoir outside kitchen.b.After experiencing multiple tectonic movements in Late Yanshanian and Himalayan Periods,the above source rock-reservoir combinations were formed with the Low and Middle Jurassic Fms as source rocks,and the basement rock,Jurassic,Paleogene and Neogene Fms as reservoirs.c.Faults,permeable sandbodies and unconformities acted as the major pathways for hydrocarbon migration;faulting,rock fracturing and tectonic movement provided the major driving forces for hydrocarbon migration and accumulation.
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