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《WELL LOGGING TECHNOLOGY》 1997-03
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Quantitative Interpretation of Fracture Porosity in Carbonates.

Li Shanjun, Xiao Chengwen, et al  
In this paper, the equivalence between response of a medium with paralell fractures of equal spacing and that of a macroscopically anisotropic medium is proved theoretically. With 3 D FEM, the responses of dual laterolog to single fracture, parallel fractures with equal spacing and anisotropic medium are obtained at different fracture dip, and it is found that the equivalence holds only when the fracture spacing is small enough. According to the functional dependence of the response of anisotropic medium upon the fracture dip, the fractures are classified into three kinds: subhorizontal fracture, dipping fracture and subvertical fracture. A method of fracture classification is given. The functional relationships between the response and the physical parameters of the fractured formation are set up. Two sets of formulae for the estimation of fracture porosity are presented, among which one for manual application, the other for computer. The distribution characteristics of the fracture aperture in the carbonate fracture type reservoir of Tarim basin are obtained through core analysis. The core is divided into a series of elementary segments of unit length, which is assumed to be the vertical resolution of the dual laterolog (about 0 5 m). The porosity of them are calculated, from which the distribution characteristics of the fracture porosity are derived. The fracture porosity of the elementary segment is used to calibrate the aforementioned formulae for estimation of fracture porosity. Also, the quantitative interpretation models are established, which can be used to compute the fracture porosity with the dual laterolog data. Application of the above models for quantitative estimation of the fracture porosity in the carbonate fracture type reservoir of Tarim basin has yielded good results.
【Fund】: 国家“八五”攻关课题
【CateGory Index】: TE15
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