<p>We proposed and demonstrated an improved fracturing treatment, which combines a mixture of solid delayed acid generating material (SDAGM) with microproppants in the pad/pre-pad fluids during the engineering process, to be an effective production stimulation technology for unconventional reservoirs. A series of laboratory experiments and mesoscopic fluid dynamics–microscopic solid mechanics coupling simulations have been conducted. In this work, first, two scaling equations are proposed and verified for recovering transient and steady-state flow response inside a fracture using porous media flow model. Then, two field-scale porous media fluid flow models, consisting of rock matrix, randomly distributed microfractures and a major hydraulic fracture, are developed to evaluate the production enhancement of using microproppants for a producing well in an unconventional reservoir. The rock matrix is constructed as porous media with hydraulic properties of tight carbonate formation. The fluid flow in the rock matrix and fractures are mutually communicated. The permeability of zones representing hydraulic fracture and microfractures are determined by upscaling and preserving the hydraulic conductivities of fracture and microfractures containing supporting proppants and microproppants. The simulation can predict the well productivity with and without microproppants in the hydraulic fracturing treatment. This developed model may be applied to optimize the concentration of microproppants in the field operation to maximize the well productivity.</p>