Title: Research on reservoir quality characterisation methods for tight sandstone reservoirs - a case study of the Southern Ordos Basin

Authors: Min Zou; Dongling Xia; Dongdong Xia; Linlin Wang

Addresses: Sinopec Petroleum Exploration and Production Research Institute, No. 197 Baisha Road, Changping District, Beijing, 102206, China ' Sinopec Petroleum Exploration and Production Research Institute, No. 197 Baisha Road, Changping District, Beijing, 102206, China ' Sinopec Petroleum Exploration and Production Research Institute, No. 197 Baisha Road, Changping District, Beijing, 102206, China ' Sinopec Petroleum Exploration and Production Research Institute, No. 197 Baisha Road, Changping District, Beijing, 102206, China

Abstract: An integrating innovation method, carrying three steps, was proposed to characterise reservoir quality distribution and select sweet spots in tight sandstone reservoir. Firstly, at the microscale, starting from the characteristics of micro-pore throats, the fundamental differences in reservoir quality due to variations in micro-pore structure are examined, establishing the relationship between different pore-throat combinations and reservoir quality. Secondly, at the mid-scale, based on the characteristics of reservoir structure at the single well level, three reservoir structure styles are proposed, and the degrees of diagenetic modification was inspected with each structure, clarifying the distribution characteristics of high-quality reservoirs within different reservoir structure. Finally, at the macroscale, starting from sedimentary differences, the impacts of differences in sedimentary scale and sedimentary clastic composition on reservoir structure types and diagenetic types are identified, thereby controlling the spatial distribution of reservoir quality. Based on these steps, a comprehensive reservoir quality characterisation method, constrained by both sedimentation and diagenesis, is developed. [Received: January 19, 2024; Accepted: March 15, 2024]

Keywords: characterisation methods; reservoir quality; tight sandstone; Ordos Basin.

DOI: 10.1504/IJOGCT.2024.140913

International Journal of Oil, Gas and Coal Technology, 2024 Vol.36 No.3, pp.245 - 271

Received: 13 Jan 2024
Accepted: 15 Mar 2024
Published online: 03 Sep 2024 *

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