Characteristics and influencing factors of spontaneous imbibition in deep tight conglomerate reservoirs in the Mahu Sag.

ABSTRACT: Research on spontaneous imbibition in deep tight conglomerate reservoirs of the Mahu Sag is vital for enhancing oil recovery and optimizing development. This study employs porosity-permeability tests, CT scanning, contact angle measurements, volumetric imbibition experiments, and NMR T₂ spectrum/imaging to investigate impacts of core properties, size, temperature-pressure conditions, and contact modes. Findings reveal strong heterogeneity in porosity (5.4%-15.8%) and permeability (0.11-8.99 mD), poor porosity-permeability correlation, and weak connectivity with low coordination numbers (≤ 5 predominant); macroscopic connected porosity strongly correlates with permeability (r = 0.92). Reservoirs show strong hydrophilicity: interstitial clays < 10° contact angle, detrital grains averaging 30

SUBMITTER: Zhang P 

PROVIDER: S-EPMC12569075 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature