Reservoir Evaluation of Upper Triassic Xujiahe Formation in Southwest Sichuan Basin
Received date: 2007-10-08
Revised date: 2008-01-03
Online published: 2008-02-10
According to core and thin-section observation,drilling,logging and reservoir physical property analysis, the reservoir body in the Xujiahe Formation of the southwest Sichuan basin is braided delta front sandbodyies which have wide distribution, poor physical properties, and low porosity and low permeability. The lithology is mainly feldspar quartz sandstone and lithic quartz sandstone, and the main pore spaces are relict primary intergranular pores, intergranular solution pores, intragranular solution pores, pores in grain films and fractures. Reservoirs of the Xu 2 and Xu 4 are well developed and the Xu 2 reservoir physical properties are better than Xu 4. Favorable reservoirs were underwater distributary channels and mouth bars. High quality reservoirs are controlled by structural conditions, sedimentary facies and particle size of rocks. The types of reservoirs in the Xujiahe Formation are mainly Types Ⅱ and Ⅲ, and the type I is less.
XIE Wu-ren,LI Xi-zhe,ZHANG Man-lang,YANG Wei,YANG Xiao,CHENG Di . Reservoir Evaluation of Upper Triassic Xujiahe Formation in Southwest Sichuan Basin[J]. Natural Gas Geoscience, 2008 , 19(1) : 94 -99 . DOI: 10.11764/j.issn.1672-1926.2008.01.94
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