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Affect of Feldspar Dissolution to Properties of Sandstone Reservoir of Chang 8 Oil Layer in Jiyuan Area, Ordos Basin
|Authors:||He Yanxiang; Zhang Wei; Hu Zuowei; Lan Yefang; Huang Peipei|
|Author Affiliations:||Primary: |
Chengdu University of Technology, Institute of Sedimentary Geology, Chengdu, China
PetroChina Coalbed Methane Company, China
|Volume Title:||Tianranqi Diqiu Kexue Natural Gas Geoscience|
|Source:||Tianranqi Diqiu Kexue = Natural Gas Geoscience, 21(3), p.482-488. Publisher: Kexue Chubanshe, Beijing, China. ISSN: 1672-1926|
|Note:||In Chinese with English summary|
|Summary:||Based on casting thin section, cathodoluminescence, scanning electron microscope, we discuss the lithological feature, petrophysical property and diagenesis of sandstone in the Chang 8 oil layer of Jiyuan area of Ordos basin. The research results show that the reservoir rock consists of feldspathic lithic sandstone and lithic feldspathic sandstone, with low compositional maturity and textural maturity, and average value of Q1/(F1+R1) less than 0.8. The dissolution of feldspar in the reservoir rock was happened under diagenetic fluid and atmospheric water action. There is a lot of clay mineral, authigenic quartz and calcite in the dissolved feldspar brim and developed pores. The feldspar dissolved matters give an influence to reservoir physical property, where the self-kaolinite and authigenic quartz give a positive role to the pore formation and protection of, whereas the carbonate and authigenic illite play a negative action to it.|
|Copyright Information:||GeoRef, Copyright 2021 American Geosciences Institute.|
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