Different from the conventional sandstone reservoirs，the pore structure of tight sandstone reservoirs is more complex，and it is difficult to divide the reservoirs by a single parameter such as porosity or permeability.Due to the difficulty of single-parameter in reservoir classification，multi parameters that can describe reservoir characteristics have been integrated to evaluate tight sandstone gas reservoirs.Take western Kelasu Gas Field in Tarim Basin as an example，after fracturing，reservoirs can be divided into four types according to gas well productivity.And combined reservoir characteristics，the stoneley slowness，stoneley permeability，reflection coefficient and porosity can be used to reflect the development of reservoir pores and fractures more sensitively.These four parameters are used as discriminant sets for reservoir evaluation of tight sandstone gas reservoirs.So a method named multivariate membership function which based on fuzzy mathematics is introduced to divide tight sandstone gas reservoirs，which clearly distinguish these four types of reservoirs.
Zhao Jun, Cao Gang, Wu Yan-liang
. Application of multivariate membership function for tight sandstone reservoir classification[J]. Natural Gas Geoscience, 2018
, 29(11)
: 1553
-1558
.
DOI: 10.11764/j.issn.1672-1926.2018.09.004
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