Weathered Volcanic Crust and Its Petroleum Geologic Significance: A Case Study of the Carboniferous Volcanic Crust in Northern Xinjiang
详细信息
- 责任者：Hou Lianhua (Research Institute of Petroleum Exploration and Development ; PetroChina ; Beijing 100083 ; China) ; Luo Xia
- 刊名：Petroleum Exploration and Development
- 出版年：2013
- 卷期：40(3)
- 关键词：结晶岩类储集层 ; crystalline reservoirs ; 风化壳 ; weathering crust
- 页码：p.257-265,274
- 图表：illus., 29 refs.
- 分类号：1003
- issnNo：ISSN1000-0747
- isbnNo：CN11-2360/TE
摘要
The Carboniferous volcanic crust in northern Xinjiang was analyzed as an example to study the characteristics and distribution of volcanic crust and its petroleum significance using the analysis of outcrops,core samples,oil testing,and logging data,etc.A complete weathered volcanic crust has a six-layer structure,which includes soil layer,hydrolysis zone,leached zone,broken-down zone I,broken-down zone II,and underlying bedrock.The characteristics and indicators for the crust of different layers are different.Effective reservoirs are developed within the leached zone and broken-down zone I.Weathered thickness is controlled by leaching time.The maximum thickness of weathered volcanic crust is about 550 m corresponding to the leaching time of 46.3 Ma.The physical properties of weathered volcanic crust are controlled by litho-facies and weathered intensity.Faults and fractures are the main controlling factors of the percolation ability of weathered volcanic reservoirs.The closer the reservoir is to the fault zone,the better the percolation ability would be.The crust is mainly distributed at the paleo-topographic high place,slopes and low place with developed faults.The vertical span of reservoirs is bigger near the fault zones.According to the established evaluation method and model of weathered volcanic intensity and effective reservoirs,the weathered volcanic intensity and effective reservoirs of none-coring wells can be evaluated.
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