Research on Three-dimensional Mechanical Parameters′ Distributionof the Tight Sandstone Reservoirs in Daniudi Gasfield
Received date: 2014-12-02
Revised date: 2015-02-04
Online published: 2015-10-10
Based on mechanical parameters testing by uniaxial/triaxial compression experiment and compressinal & shear acoustic velocities testing,the relationship between the static and dynamic elastic parameters of the tight sandstone reservoirs of Daniudi Gasfield in the Ordos Basin was established,then a single-well calculation model of mechanical parameters was constructed referring to predecessors′ achievements,further the characteristics of mechanical parameters field were investigated with log data and three-dimensional seismic interval velocity data.The results show that the cohesion of the Upper Paleozoic tight sandstone reservoirs ranges from 2MPa to 10MPa,the angle of internal friction being between 30° and 42°,the tensile strength mostly being between 5MPa and 15MPa,and the compressive strength mostly being between 150MPa and 250MPa.The modulus of elasticity of C2t2-P1x1 sandstone reservoirs is mostly between 15GPa and 40GPa,and their Poisson′s ratio is between 0.22 and 0.27.The rock elastic parameters show obvious inhomogeneities horizontally and their values increase with depth vertically.The research results can provide basic mechanical parameters for stress field simulation,gas drilling & completion design and target-layers′ fracturing,additionally the quantitative relationship between the static and dynamic mechanical parameters and that between the shear and longitudinal wave velocity might supply a reference for similar study in surrounding areas.
LU Shi-kuo，WANG Di，LI Yu-kun，MENG Xian-jun，HU Xiang-yang，CHEN Shu-wei . Research on Three-dimensional Mechanical Parameters′ Distributionof the Tight Sandstone Reservoirs in Daniudi Gasfield[J]. Natural Gas Geoscience, 2015 , 26(10) : 1844 -1850 . DOI: 10.11764/j.issn.1672-1926.2015.10.1844
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