title: Real-time detection of dielectric anisotropy or isotropy in unconventional oil-gas reservoir rocks supported by the oblique-incidence reflectivity difference technique.
abstract: Current geological extraction theory and techniques are very limited to adequately characterize the unconventional oil-gas reservoirs because of the considerable complexity of the geological structures. Optical measurement has the advantages of non-interference with the earth magnetic fields, and is often useful in detecting various physical properties. One key parameter that can be detected using optical methods is the dielectric permittivity, which reflects the mineral and organic properties. Here we reported an oblique-incidence reflectivity difference (OIRD) technique that is sensitive to the dielectric and surface properties and can be applied to characterization of reservoir rocks, such as shale and sandstone core samples extracted from subsurface. The layered distribution of the dielectric properties in shales and the uniform distribution in sandstones are clearly identified using the OIRD signals. In shales, the micro-cracks and particle orientation result in directional changes of the dielectric and surface properties, and thus, the isotropy and anisotropy of the rock can be characterized by OIRD. As the dielectric and surface properties are closely related to the hydrocarbon-bearing features in oil-gas reservoirs, we believe that the precise measurement carried with OIRD can help in improving the recovery efficiency in well-drilling process.
authors.affiliation: State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, 102249, China.|Beijing Key Laboratory of Optical Detection Technology for Oil and Gas, China University of Petroleum, Beijing, 102249, China.
authors.forename: Honglei
authors.initials: H
authors.lastname: Zhan
authors.affiliation: Beijing Key Laboratory of Optical Detection Technology for Oil and Gas, China University of Petroleum, Beijing, 102249, China.
authors.forename: Jin
authors.initials: J
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, 102249, China.|Beijing Key Laboratory of Optical Detection Technology for Oil and Gas, China University of Petroleum, Beijing, 102249, China.
authors.forename: Kun
authors.initials: K
authors.lastname: Zhao
authors.affiliation: Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
authors.forename: Huibin
authors.initials: H
authors.lastname: Lű
authors.affiliation: Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
authors.forename: Kuijuan
authors.initials: K
authors.lastname: Jin
authors.affiliation: Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
authors.forename: Liping
authors.initials: L
authors.lastname: He
authors.affiliation: Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
authors.forename: Guozhen
authors.initials: G
authors.lastname: Yang
authors.affiliation: State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, 102249, China.
authors.forename: Lizhi
authors.initials: L
authors.lastname: Xiao