Abstract: Deep and ultra-deep clastic rock reservoirs are the critical target for current hydrocarbon exploration and development in the Tarim Basin. However, due to the lack of systematic research on the rock physical properties of these reservoirs, the establishment of the comprehensive evaluation and prediction systems by using well-logging and seismic methods in relevant formations has been constrained. Therefore, taking the Ahe Formation reservoirs in the eastern Kuqa Depression of the Tarim Basin as an example, through systematic testing of the petrological characteristics, reservoir characteristics and rock physical parameters of typical sandstone samples, the variation patterns and influencing factors of the rock physical properties are analyzed, and the key geological factors for the variations in seismic elastic properties of the sandstone samples are also determined. Then, a quantitative rock physical template is constructed to reflect the influence of pore structure, fluid saturation and frequency on the seismic elastic properties of Ahe formation sandstone. The research results show that the sandstones in the Ahe formation sandstone can be divided into three main petroface types: ductile lithic-lean sandstone, lithic-rich sandstone and tightly carbonate-cemented sandstone according to the differences of petrological components, lithic type and pore structure. The petrophysical properties of sandstone samples generally show typical low-porosity and low-permeability characteristics, with porosity and permeability being positively correlated, and permeability and porosity is negatively correlated with the content of ductile lithic. The rock physical properties of the Ahe formation sandstones are controlled by rock components (especially the content of ductile lithic), pore structure and pore fluid type, and the influence of temperature is relatively weak, which results in the corresponding seismic rock properties to show the features of regional distribution in the cross plots of velocity versus velocity ratio and porosity versus velocity. The preferred orientation arrangement of ductile lithic and micro-cracks is the main reason for velocity anisotropy. Under high effective pressure, velocity anisotropy is positively correlated with ductile lithic content, and can be expressed by a power exponent equation. The quantitative rock physical template is constructed based on the rock framework and pore structure characteristics of the Ahe formation sandstone, which can give a well depiction on the influence of crack, pore-fluid saturation, rock framework properties and frequency on the rock physical parameters. The research results can provide experimental basis and theoretical supports for well-logging and seismic evaluation of the key reservoir parameters of deep and ultra-deep clastic rock reservoirs.