Author(s)

Chunhua Lu, Hanqiao Jiang, Chengcheng You, Shiyuan Qu and Junjian Li

Corresponding Author

Chunhua Lu

ABSTRACT

Understanding the pore structure of tight reservoirs is essential to improve the development of tight oil. In this paper, 12 cores in C2 and C7 section of Ordos Basin were subjected to pressure-controlled porosimetry (PCP) experiments and rate-controlled porosimetry (RCP) experiments to characterize the pore throat structure of tight cores. The results show that the pore radius varies from 100μm to 350μm with small difference. The throat controls the shape of the mercury intrusion curve and is the main storage space for tight sandstone, with radius less than 10μm. The combined PCP pore-throat radius curve and RCP throat radius curve show that when the radius is less than 0.12μm, the denser the core, the pore-throat shows similar properties to the throat on the mercury injection curve.

KEYWORDS

Tight reservoirs, pore structure, pressure-controlled porosimetry, rate-controlled porosimetry