Research on rock physical modeling and "sweet spot" prediction methods for tight sandstone reservoirs

YuQing ZHOU, JiaJia ZHANG, GuangZhi ZHANG, Ying LIN

Prog Geophy ›› 2025, Vol. 40 ›› Issue (1) : 255-265.

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Prog Geophy ›› 2025, Vol. 40 ›› Issue (1) : 255-265. DOI: 10.6038/pg2025HH0436

Research on rock physical modeling and "sweet spot" prediction methods for tight sandstone reservoirs

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Abstract

In recent years, the production of tight sandstone gas in China has been rising, how to analyze the internal "sweet spot" of tight sandstone reservoir based on the characteristics of low porosity and low permeability has become a key issue. In this paper, the petrophysical model of tight sandstone is established by analyzing the petrophysical characteristics of tight sandstone and aggregating the pore structure connectivity of tight sandstone. Then, combined with the characteristics of the actual work area, the geophysical "sweet spot" are divided according to the porosity, P-wave impedance and other parameters. The sensitive parameters of "sweet spot" of tight sandstone reservoir, such as the ratio of bulk modulus to shear modulus(K/μ) and the ratio of P-wave velocity to S-wave velocity, are obtained, which lay a foundation for subsequent pre-stack seismic inversion for "sweet spot". Finally, the reflection coefficient equation applicable to the sensitive parameters of tight sandstone "sweet spot" is derived based on the elastic impedance inversion, and the quantitative prediction of class Ⅰ sweet spot to class Ⅱ sweet spot (coarse-grained rock facies) is realized according to the P-wave modulus and the sensitive parameters of "sweet spot", which effectively indicates the gas-bearing reservoir area and provides a reference for the evaluation and development of low permeability tight sandstone reservoir.

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Tight sandstone / Sweet spot / Rock physics model / Elastic impedance inversion

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YuQing ZHOU , JiaJia ZHANG , GuangZhi ZHANG , et al. Research on rock physical modeling and "sweet spot" prediction methods for tight sandstone reservoirs[J]. Progress in Geophysics. 2025, 40(1): 255-265 https://doi.org/10.6038/pg2025HH0436

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