Title: Micro-nano pore throat structure and occurrence characteristics of tight sandstone gas: a case study in the Ordos Basin, China

Authors: Fengjiao Wang; Chaoyang Hu; Yikun Liu; Jiqiang Zhi

Addresses: Department of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China; Key Laboratory for Enhanced Oil and Gas Recovery of the Ministry of Education, 163318, China ' Department of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China; Key Laboratory for Enhanced Oil and Gas Recovery of the Ministry of Education, 163318, China ' Department of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China; Key Laboratory for Enhanced Oil and Gas Recovery of the Ministry of Education, 163318, China ' Department of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China; Key Laboratory for Enhanced Oil and Gas Recovery of the Ministry of Education, 163318, China

Abstract: To characterise the pore structure, pore throat size and movable fluid occurrence state, a case study was conducted on the Sulige tight sandstone gas field in Ordos Basin. The experiments contented mercury intrusion capillary pressure, nuclear magnetic resonance (NMR), centrifugal test and routine core analysis. The relationship between microscopic pore structure and macroscopic performance was established. The micropores in Sulige tight sandstone gas field is the dominant factor affecting the microscopic pore throat structure characteristics. The transport ability in pore throat is mainly affected by the size of throat and the pore-throat ratio. Due to the frequent alternation of larger pores and smaller pores, the fluid seepage resistance increases greatly, which is attributed to poorer percolation capacity of tight sandstone gas reservoir. The results are also of great significance for the quantitative characterisation of pore structure characteristics and for industry petroleum exploration of tight sandstone gas reservoirs. [Received: June 15, 2018; Accepted: March 29, 2019]

Keywords: tight sandstone gas reservoir; pore throat structure; fluid occurrence state; constant speed mercury intrusion; nuclear magnetic resonance; Sulige gas field; Ordos Basin; China.

DOI: 10.1504/IJOGCT.2020.110390

International Journal of Oil, Gas and Coal Technology, 2020 Vol.25 No.3, pp.237 - 257

Received: 15 Jun 2018
Accepted: 29 Mar 2019

Published online: 01 May 2020 *

Full-text access for editors Access for subscribers Purchase this article Comment on this article