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Quantitative prediction of fracture density based on friction effect
SONG Fan1, SU Nina1, FENG Jianwei1, LUO Caiming2, CHEN Jingjing3, SONG Mingfu3
(1.School of Geosciences in China University of Petroleum, Qingdao 266580, China;2.Exploration and Development Research Institute, Petrochina Tarim Oilfield Branch, Korla 841000, China;3.Luming Exploratory Development Limited of Shengli Oilfield, Dongying 257001, China)
Abstract:
Aiming at low-permeability reservoirs in compressional basins, a new fracture density quantitative prediction method considering surface friction energy was developed using rock mechanic tests and theoretical derivation of relationships between the stress field and fracture parameters. The results show that the combination of rock deformation criteria with the energy conversion laws is an effective approach to establish the mechanical model of the stress field and fracture parameters. The fracture density increases with strain energy density, after the inner stress state exceeds failure conditions. In addition to breaking the inner cohesion in the sandstone, the formation of cracks has to overcome the resistance of the confining pressure and the frictional effect. The Coulomb-Moire criterion can be used to estimate rock rupture, and then to clarify the mathematic relation between the stress-strain and rock fracture density. The predictions of the established model are in good agreement with the observed fracture density of low permeability sandstone in the northwest margin of Junggar Basin.
Key words:  low permeability sandstone  stress-strain  friction energy  fracture density  quantitative prediction