Pore Structure and Fractal Characteristics of Continental Low Maturity Organic-Rich Shale in the Sha-4 Member of the Liaohe Western Depression

The research on pore structure and heterogeneity of shale reservoirs has always been a hotspot in the study unconventional reservoir characteristics. China is country dominated by continental shale. Compared with marine shale, lower maturity stronger heterogeneity. In this study, Sha-4 Liaohe Western Depression was selected for low-temperature nitrogen adsorption, scanning electron microscopy other experiments revealing fractal characteristics low mature organic-rich dimension calculated FHH model effects TOC mineral composition were discussed. results show that area mainly mesoporous main types are inorganic pores relatively large diameters, such as intergranular inter-crystalline pores. morphology very complex, narrow slit flat pore, often filled organic matter. dimensions D1 range from 2.58 to 2.87 D2 2.18 2.55, shows obvious dual affected quartz due degree thermal evolution their different those reservoirs. increase reduces reservoir. addition, particles strong weathering resistance stability can protect improve reduce This provide support member Depression.