Paleo-Weathering Crust at the Top of Sinian Dengying Formation in Northern Guizhou and Its Petroleum Exploration Significance
详细信息
- 责任者：Liu Jiahong (Chengdu Institute of Geology and Mineral Resources ; Chengdu 610082 ; China) ; Yang Ping
- 刊名：Geology in China
- 出版年：2012
- 卷期：39(4)
- 关键词：风化壳 ; weathering crust ; 油气藏形成 ; reservoir formation ; 贵州 ; Guizhou Province
- 页码：p.931-938
- 图表：4 illus., 2 tables, 17 refs.
- 分类号：1001
- issnNo：ISSN1000-3657
- isbnNo：CN11-1167/P
摘要
The paleo-weathering crust is important for karst reservoir formation and hydrocarbon accumulation. Field geological survey reveals that there exists a paleo-weathering crust at the top of Sinian Dengying Formation in northern Guizhou Province, which was formed by Tongwan tectonic movement and is composed of yellowish brown scoriaceous clay rock. Its geochemistry is characterized by depletion of MgO and relative enrichment of SiO2, Al2O3, Fe2O3, Fe2O, P2O5, and TiO2. The paleo-weathering crust is somewhat different in different facies, which results in the difference of underlying karst reservoirs.