Alkali Diagenesis of Xujiahe Sandstone in Hebaochang Block in Sichuan Basin

Abstract

Abstract: The typical quartz dissolution of alkali diagenesis of Xujiahe formation in Hebaochang block in Sichuan basin is firstly discovered, which forms secondary porosity characterized by such a quartz dissolution. Based on the analyses of thin section, scanning electron microscope, X-ray diffraction, combined with the regional geology conditions, the characteristics and formation mechanism of alkali diagenesis in this area are studied. The results show that the sandstone of Xujiahe formation undergoes strong diagenesis and enters into the stage of late diagenetic B, with transition from early acidity to late alkalinity. The alkali diagenesis reconstructs the sandstone of Xujiahe formation and allows its physical property to be much better.

Key words: Sichuan basin, Xujiahe formation, alkali diagenesis, diagenetic environment, quartz dissolution

CLC Number:

TE111.3

ZHANG Sheng-bin, LIU Zhen, LIU Hong-jun, SONG Ya-hui, LI Xin-min, XU Tao. Alkali Diagenesis of Xujiahe Sandstone in Hebaochang Block in Sichuan Basin[J]. Xinjiang Petroleum Geology, 2011, 32(5): 464-468.

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