大气水在碎屑岩次生孔隙形成中的作用——以鄂尔多斯盆地三叠系延长组为例

黄思静; 武文慧; 刘洁; 沈立成; 黄成刚

Volume 28 Issue 4

Jul. 2003

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Article Navigation > Earth Science > 2003 > 28(4): 419-424

HUANG Si-jing, WU Wen-hui, LIU Jie, SHEN Li-cheng, HUANG Cheng-gang, 2003. Generation of Secondary Porosity by Meteoric Water during Time of Subaerial Exposure: An Example from Yanchang Formation Sandstone of Triassic of Ordos Basin. Earth Science, 28(4): 419-424.

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Generation of Secondary Porosity by Meteoric Water during Time of Subaerial Exposure: An Example from Yanchang Formation Sandstone of Triassic of Ordos Basin

State Key Laboratory of Oil/Gas Reservoir Geology and E xploitation, Chengdu University of Technology, Chengdu 610059, China

Received Date: 2003-04-18
Publish Date: 2003-07-25

Abstract

Abstract

Secondary porosity is the most important reservoir space in the sandstone. The authors present an example of leaching by meteoric water in the Yanchang Formation sandstone of Triassic of Ordos basin. The interpretation is based on the information of detailed research of thin sections and a lot of statistical data. Yanchang Formation sandstone lies beneath the unconformity at the base of the Jurassic section. Subsequent detailed petrographic study has confirmed that the potassium depletion has brought about potassium feldspar dissolution, resulting in precipitation of kaolinite and creation of secondary porosity. The evidence strongly suggests the subaerial exposure of the Yanchang Formation sandstone in Early Jurassic and consequent freshwater leaching of the Yanchang Formation sandstone and generation of the secondary porosity. So secondary porosity of Yanchang Formation sandstone is not formed by the dissolution of organic acid during the time of burying diagenesis. The prediction model of reservoir quality should be modified by means of the new mechanisms of generation of secondary porosity.
- Ordos basin,
- Yanchang Formation of Triassic,
- clastic reservoir,
- secondary porosity,
- meteoric water

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References(15)

References

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