Pore Structure Characterization Of Shale At The Micro And Macro Scale

Download or read book Pore Structure Characterization of Shale at the Micro- and Macro-scale written by Chunbi Jiang and published by . This book was released on 2016 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pore structures within two Barnett shale samples at the microscale and macroscale were constructed based on conventional core analysis techniques (mercury intrusion capillary pressure (MICP), nitrogen sorption, and helium porosimetry). Measurements were performed on both bulk samples (core 2 and core 6) and organic matter isolated from bulk samples. Pore size distributions obtained from both core 2 and core 6 contain a large volume of micropores, while pore size distributions obtained from isolated organic matter do not, indicating that organic matter-associated pores are mesopores and most of the micropores are within the matrix. The organic matter-associated pore volume of core 2 is about 22% of the total pore volume, and the organic matter-associated pore volume of core 6 is about 41% of the total pore volume. A bundle of short conduits model with constraints can explain the measured nitrogen desorption isotherm on organic matter, and this model was used to represent the microscale pore structure within organic matter. Fragment size effect was observed on both MICP curves and nitrogen sorption isotherms measured on bulk Barnett samples: smaller fragment size results in larger mercury intrusion or nitrogen gas sorption. Fragment size effect does not appear in helium porosity measurement on bulk samples.