
Research on microscopic damage characteristics of fracturing fluid in different types of tight sandstone reservoirs with the NMR
YongGang XIE, HuaQiang SHI, XiaoLin LI, LiAn ZHU, LeKai HOU, XiaoRui LIU, Li DING, XiaoHang LI, Teng LI
Prog Geophy ›› 2025, Vol. 40 ›› Issue (2) : 568-579.
Research on microscopic damage characteristics of fracturing fluid in different types of tight sandstone reservoirs with the NMR
The microscopic pore structure of tight sandstone reservoirs exhibits strong heterogeneity, and the characteristics of hydraulic fracturing fluid damage vary widely. By finely classifying the types of tight sandstone reservoirs and clarifying the microscopic damage characteristics of different types of tight sandstone reservoirs, effective guidance can be provided for hydraulic fracturing treatments of tight sandstone reservoirs. Based on this, the study focuses on the tight sandstone reservoirs of the Shanxi Formation in the northeastern part of the Ordos Basin. Building upon a refined characterization of reservoir types, nuclear magnetic resonance (NMR) quantitative characterization technology was employed to study the microscopic damage characteristics of different types of reservoirs. The results show that the tight sandstone reservoirs of the Shanxi Formation can be classified into three types: type Ⅰ, type Ⅱ, and type Ⅲ. Type Ⅰ reservoirs exhibit good porosity and permeability properties, high pore-throat selectivity coefficients, and a high percentage of movable fluids. Type Ⅱ reservoirs have relatively good porosity and permeability properties, good pore-throat selectivity coefficients but poor fluid mobility, while Type Ⅲ reservoirs exhibit overall poor physical characteristics. The results of NMR T2 spectra and T1-T2 spectra of hydraulic fracturing fluid microscopic damage show that Types Ⅰ and Ⅲ reservoirs suffer more significant fluid damage, which is closely related to the development of large pores and microfractures in these two types of reservoirs.
Tight sandstone / Fracturing fluid damage / Reservoir type / NMR T2 spectrum / NMR T1-T2 spectrum
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感谢审稿专家提出的修改意见和编辑部的大力支持!
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