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has been cited by the following article:

• TITLE: Porosity Formation and Evolution of the Deeply Buried Lower Triassic Feixianguan Formation, Puguang Gas Field, NE Sichuan Basin, China

  AUTHORS: Xuefeng Zhang, Tonglou Guo, Bo Liu, Xiaoyue Fu, Shuanglin Wu

  KEYWORDS: Porosity Evolution; Diagenesis; Lower Triassic Feixianguan Formation; Puguang Gas Field; Sichuan Basin

  JOURNAL NAME: Open Journal of Geology, Vol.3 No.4, July 24, 2013

  ABSTRACT: The deeply buried shoal dolomite reservoirs of the Lower Triassic Feixianguan Formation, giant Puguang Gas Field, NE Sichuan Basin, are exceptionally porous. The influences of diageneses on pore evolution are studied. Through petrologic investigation, diagenetic phases are divided into four stages, i.e., near-surface, pre-oil window, oil window, and gas window. The Adobe Photoshop system is used to quantify the rock texture components, porosity constitutions and the influences of diageneses on reservoir porosity. Porosity evolution curves are quantitatively recovered. The Feixianguan reservoir porosities are mainly created by early meteoric dissolution, dolomitization, and organic acids dissolution. Dissolution during deep burial is insignificant. Pores are formed in near-surface and pre-oil window stages and effectively preserved till present. This result may be of great significance to the further exploration of deeply buried carbonate reservoirs not only in NE Sichuan Basin, but also around the world.