Porosity Formation and Evolution of the Deeply Buried Lower Triassic Feixianguan Formation, Puguang Gas Field, NE Sichuan Basin, ChinaReport as inadecuate




Porosity Formation and Evolution of the Deeply Buried Lower Triassic Feixianguan Formation, Puguang Gas Field, NE Sichuan Basin, China - Download this document for free, or read online. Document in PDF available to download.

The deeply buried shoal dolomite reservoirs of theLower Triassic Feixianguan Formation, giant Puguang Gas Field, NE Sichuan Basin, are exceptionally porous. Theinfluences of diageneses on pore evolution are studied. Through petrologicinvestigation, diagenetic phases are divided into four stages, i.e.,near-surface, pre-oil window, oil window, and gas window. The Adobe Photoshopsystem is used to quantify the rock texture components, porosity constitutionsand the influences of diageneses on reservoir porosity. Porosity evolutioncurves are quantitatively recovered. The Feixianguan reservoir porosities aremainly created by early meteoric dissolution, dolomitization, and organic acidsdissolution. Dissolution during deep burial is insignificant. Pores are formedin near-surface and pre-oil window stages and effectively preserved tillpresent. This result may be of great significance to the further exploration ofdeeply buried carbonate reservoirs not only in NE Sichuan Basin, but alsoaround the world.

KEYWORDS

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

Cite this paper

X. Zhang, T. Guo, B. Liu, X. Fu and S. Wu -Porosity Formation and Evolution of the Deeply Buried Lower Triassic Feixianguan Formation, Puguang Gas Field, NE Sichuan Basin, China,- Open Journal of Geology, Vol. 3 No. 4, 2013, pp. 300-312. doi: 10.4236-ojg.2013.34035.





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

Source: http://www.scirp.org/



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