Distribution of Kaolinite and Its Influencing Factors in the Reservoir of Shahejie Formation in Dongying Depression
详细信息
- 责任者：Guo Jia (State Key Laboratory of Petroleum Resources and Prospecting ; China University of Petroleum ; Beijing 102249 ; China) ; Zeng Jianhui
- 刊名：Geoscience
- 出版年：2013
- 卷期：27(5)
- 关键词：砂岩储集层 ; sandstone reservoirs ; 高岭石 ; kaolinite ; 东营凹陷 ; Dongying Sag
- 页码：p.1089-1098
- 图表：14 illus., 24 refs.
- 分类号：1003
- issnNo：ISSN1000-8527
- isbnNo：CN11-2035/P
摘要
Kaolinite widely distributed in the sandstone reservoir of the Shahejie Formation in Dongying depression,which is an important factor affecting the reservoir physical properties.But the research on its distribution characteristics and controlling factors is less comparatively.This paper goes on to research the distribution characteristics and controlling factors of kaolinite by analyzing the data from casting lamella,X-ray diffraction,cathode luminescence image,electron scan microscope.Research results show that kaolinite mainly developed in the range of depth 1,200-3,600 m.The average relatively content of kaolinite are much higher in Es2 and Es3.As to the kaolinite content in Es1 to Es3,the central uplift belt is higher than northern steep slope and southern ramp zone of Dongying depression.Distribution of kaolinite in the sandstone reservoirs of Shahejie Formation is obviously affected by thermal evolution of organic matter.Different temperatures(buried depth) affect the content of kaolinite in different horizons of Shahejie Formation and its distribution in plane and profile by controlling the formation and transformation of clay minerals.The overpressure has an important influence on the distribution of kaolinite.Due to overpressure,the overpressured top boundary is generally characterized by well-developed kaolinite.Tectonic activity of central uplift belt of Dongying is strong,which is advantageous to the acidic fluid from deep to shallow filling.And hydrodynamic force is strong,leading to kaolinite content in Es1 to Es3 of the central uplift belt is higher.The pathway system composed of fault and unconformity surface transport a large number of acidic fluid into the shallow reservoirs,which lead to considerable development of kaolinite.Lithology and sedimentary microfacies change the fluid chemistry and hydrodynamic conditions,thus has an important influence on kaolinite distribution.
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