Pore structure characterization of Chang-7 tight sandstone using MICP combined with N₂GA techniques and its geological control factors.

ABSTRACT: Understanding the pore networks of unconventional tight reservoirs such as tight sandstones and shales is crucial for extracting oil/gas from such reservoirs. Mercury injection capillary pressure (MICP) and N₂ gas adsorption (N₂GA) are performed to evaluate pore structure of Chang-7 tight sandstone. Thin section observation, scanning electron microscope, grain size analysis, mineral composition analysis, and porosity measurement are applied to investigate geological control factors of pore structure. Grain size is positively correlated with detrital mineral content and grain size standard deviation while negatively related to clay content. Detrital mineral content and grain size are positively correlated with porosity, pore throat radius and withdrawal efficiency and

SUBMITTER: Cao Z 

PROVIDER: S-EPMC5103269 | biostudies-literature | 2016 Nov

REPOSITORIES: biostudies-literature