Diagenetic Environment Evolution of Deep Sandstones in ihe Upper Es4 of the Palaeogene in Lijin Sag
详细信息
- 责任者：Tang Xinping (Research Institute of Exploration and Development ; Dagang Oilfield Company ; CNPC ; Tianjin 300280 ; China) ; Huang Wenhui
- 刊名：Earth Science
- 出版年：2013
- 卷期：38(4)
- 页码：p.843-852
- issnNo：ISSN1000-2383
- isbnNo：CN42-1233/P
摘要
This paper focuses on the diagenetic environments of deep sandstones in the upper Es4 of the palaeogene in Lijin sag, where core samples are obtained. Microscopic observations, including light, fluorescent, and cathodoluminescence microscopy, as well as scanning electron microscopy, are carried out. The contents of clay mineral and some chemical composition are also detected. 2 types of diagenetic environment are classified. The acidic diagenetic environment is indicated by the dissolution of carbonates and feldspar, the development of kaolinite and autogenic quartz at the same time. The alkaline diagenetic environment is marked by feldspar overgrowth, carbonate cement and the dissolution of quartz at the same time. The evolution of diagenetic environment is discussed. Alkaline environment dominated the syndiagenetic stage, which was formed by the sedimentary salt water. Early diagenetic stage went through temporary acidic environment, formed by early hydrocarbon evolution, and mostly alkaline environment, formed by inherited alkaline fluid. The A1 period of middle diagenetic stage (in the depth of 2 700-3 200 m) was dominated by acidic environment, formed by the organic maturation. The A2 period of middle diagenetic stage was dominated by alkaline environment, formed by the alkaline fluid from the deep fault. The B period of middle diagenetic stage was dominated by acidic environment, formed by the continued evolution of second filled oil.
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