Characteristics of the Upper Triassic Xujiahe Formation Sandstone Reservoirs and Controls on Oil and Gas in the Guang'an Gas Field, Central Sichuan
Received date: 2008-10-28
Revised date: 2009-01-19
Online published: 2009-04-10
Based on the petrologic data，sandstone thin sections and molded thin sections of about 38 wells, this paper describes the reservoir characteristics of the Upper Triassic sandstone reservoirs in the Guang′an gas field, analyzes the different rock type of gas reservoir, discusses diagenesis control on the distribution of gas reservoirs. The reservoirs have the medium texture maturity and lower maturity composition. Reservoir lithology is mainly feldspathic litharenite, feldspar quartz sandstone, lithic feldspar sandstone. The content of debris gradually increases from Xu2 to Xu6. Feldspathic litharenite sandstones are rich in gas. The reservoirs are low porosity and permeability. The main reservoir space includes primary intergranular pores, intragranular pores and intergranular pores (intergranular dissolved pores). The development degree of primary intergranular pores decides the reservoir basic properties. The reservoir has diagenetic facies of quartz secondary enlargement-lining chlorite facies, quartz secondary enlargement-dissolution facies, lining chlorite dissolution facies, lining chlorite-carbonate cementation facies, quartz secondary enlargement-carbonate cementation facies. The lining chlorite-dissolution facies and quartz secondary enlargement-dissolution facies are favorable for reservoir formation.
Key words： Guangan gas field; Xujiahe Formation; Rock type; Reservoir space; Diagenesis.
XIE Wu-Ren, XIE Zeng-Ye, YANG Wei, YANG Jia-Jing, JIN Hui, ZHU Qiu-Ying . Characteristics of the Upper Triassic Xujiahe Formation Sandstone Reservoirs and Controls on Oil and Gas in the Guang'an Gas Field, Central Sichuan[J]. Natural Gas Geoscience, 2009 , 20(2) : 204 -210 . DOI: 10.11764/j.issn.1672-1926.2009.02.204
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