长石砂岩次生溶孔的形成机理

doi:10.11743/ogg20050214

Abstract

Abstract:

In acidic aqueous media, feldspar minerals can be dissolved to some extents, leading to the formation of secondary pores. Secondary porosity can be quantitatively estimated based on the composition and physicochemical properties of the original and secondary minerals. Secondary porosity formed by dissolution of K-feldspar can be as high as 11.91%, while that of calcium feldspar is the lowest, being only 0.27%, and that of sodium feldspar and andesine range between the former two. Some of the CO₂ needed for dissolving feldspar might have been sourced from meteoric water and/or dissolved from the air when water got in touch with atmospheric air, while the others might have been the products of decomposition of organic matter during generation of hydrocarbons.

Key words: arcose, dissolution, secondary porosity

CLC Number:

TE112.221

Li Wenguo, Zhang Xiaopeng, Zhong Yumei. Formation mechanism of secondary dissolved pores in arcose[J]. Oil & Gas Geology, 2005, 26(2): 220-223,229.

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Formation mechanism of secondary dissolved pores in arcose

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