Distribution and Origin of Secondary Pores in Xujiahe Formation Sandstone Reservoirs in Mid-south Sichuan Basin
Received date: 2008-06-03
Revised date: 2009-02-26
Online published: 2009-04-10
The research of petrologic character in the mid-south Sichuan Basin indicates that reservoir spaces in Upper Triassic Xujiahe Formation are mainly crude residual intergranular pores and secondary pores. The origin of the secondary pores is the dissolution of feldspar, debris, carbonate cement and clay mineral by organic and carbonic acids, which are generated during the evolvement of organic material. Moreover, the secondary pores are related to the thickness and distribution of source rock, sedimentary microfacies of sandstones, and faults. Two secondary pores belts exist vertically from 1 700 m to 2 050 m. The distribution of the secondary pores in plane is mainly affected by original component of sediments.
CHEN Gang, WEI Guo-Ji, YANG Wei, LIU Man-Cang, SHI Zhen-Sheng, SHEN Yu-hong, ZHU . Distribution and Origin of Secondary Pores in Xujiahe Formation Sandstone Reservoirs in Mid-south Sichuan Basin[J]. Natural Gas Geoscience, 2009 , 20(2) : 192 -198 . DOI: 10.11764/j.issn.1672-1926.2009.02.192
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