The properties and relationship of the brittleness, mineral composition and porosity for tight oil reservoirs

Article type: Research Article

Authors: Zhang, Li gang^{a; b; *} | Qu, Si ning^a | Li, Shi bin^a | Li, Wei^a | Guan, Bing^a | Wang, Chang hao^a

Affiliations: [a] Department of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China | [b] College of Engineering and Applied Science (CEAS), University of Cincinnati, USA

Correspondence: [*] Corresponding author. E-mail: [email protected].

Abstract: The brittleness is widely used as the key parameter to evaluate the potential effectiveness of hydraulic fracture in tight oil reservoirs. In this study, the main purpose is to evaluate and reveal the brittleness and influence factors for tight gas reservoirs. Therefore, porosity, X-ray diffraction (XRD) and triaxial compress experiments are carried out for 35 specimens in Song Liao basin, and the value of porosity, mineral composition, mechanics parameters and brittleness index are obtained in the same pressure and temperature environment. The relation between the brittleness and minerals content, porosity is analyzed by the single factor and multiple factors analysis method. The predicted model of the brittleness index with porosity and minerals content is proposed and verified by experiment. It is robust and effective for predicting brittleness index. The research result supply the basis for development plan design of tight oil reservoirs.

Keywords: Tight oil reservoir, brittleness, mineral composition, porosity, rock mechanical characteristics

DOI: 10.3233/SFC-170201

Journal: Strength, Fracture and Complexity, vol. 10, no. 2, pp. 89-99, 2017