Genesis and Identification of High Gamma Sandstone in the First Member of Nantun Formation of Wunan Depression in Hailar Basin
详细信息
- 责任者：Yu Zhenfeng (College of Earth Sciences ; Jilin University ; Changchun 130061 ; China) ; Cheng Rihui
- 刊名：Journal of China University of Petroleum
- 出版年：2012
- 卷期：36(3)
- 关键词：砂岩储集层 ; sandstone reservoirs ; 海拉尔盆地 ; Hailar Basin
- 页码：p.76-83
- 图表：illus., 3 tables, 25 refs.
- 分类号：1003
- issnNo：ISSN1673-5005
- isbnNo：CN37-1441/TE
摘要
In order to improve the accuracy of logging lithology identification of high natural gamma sandstone in Wunan Depression in Hailar Basin,in terms of rock core and microscopic sections description and logging analysis,the causes and identification of high gamma sandstones were discussed.The results show that the factors affecting these sandstones with high natural gamma are tuffaceous matter,clay,oil,feldspar and calcium.High natural gamma sandstones express high content of thorium or uranium from logging data.The tuffaceous matter leads to the enrichment of thorium,clay leads to the enrichment of uranium,thorium and potassium,oil leads to the enrichment of uranium,feldspar leads to the enrichment of potassium,and calcareous matter leads to the decrease of uranium content. The affecting factors of sandstone nature gamma ray are high tuffaceous matter,high feldspar and high clay ranging from edge to center of the depression.
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