Pre-Jurassic Palaeogeomorphology and Its Control Action in Zhidan Area, Northern Shaanxi Province

详细信息   

• 责任者：Wang Jianmin (School of Earth Science and Engineering ; Xi’an Petroleum University ; Xi’an 710065 ; China) ; Tian Dong’en
• 刊名：Journal of Lanzhou University (Natural Sciences)
• 出版年：2012
• 卷期：48(4)
• 关键词：古地形 ; paleorelief ; 油气藏 ; oil and gas reservoir ; 陕西 ; Shaanxi Province
• 页码：p.1-7
• 图表：3 illus., 14 refs.
• 分类号：1003
• issnNo：ISSN0455-2059
• isbnNo：CN62-1075/N

摘要

Comprehensive methods, such as impression method, residual thickness method, deposition method etc., were used to divide Zhidan area into four basic units, i.e. erosion highland, erosion valley, erosion slop and erosion monadnock. The results indicate that pre-ancient landform had an important control action and influence on the formation, structure, sedimentation and reservoir characteristics of the hydrocarbon accumulation of the areas located at upper and lower erosion surface. The top erosion structural features of Chang 2 oil bearing set under the erosion surface well show some basic configuration of the eroded ancient landform of Indo-China movement; the early deposition of Yan’an Formation above the erosion surface is a mirror image of the pre-ancient landforms; Yan 10 oil bearing set’s top structure has a feature of centralized growth around an old upland background.