title: Impact of focused gamma ray beam angle on the response of density logging tool.
abstract: The response of the gamma-gamma density logging tool with different focused gamma ray beam angle is investigated by using the MCNP code. This work focuses on the four aspects of spatial distribution and energy spectrum of scattered gamma rays, measurement uncertainty, the depth of investigation, and vertical resolution of the logging tool. The results show that the density measurement accuracy can be improved when a relative larger collimator angle is employed, and the vertical resolution of the tool would not get worse.
authors.affiliation: School of Geosciences, China University of Petroleum (East China), Qingdao 266580, China; Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China.
authors.forename: He
authors.initials: H
authors.lastname: Wu
authors.affiliation: School of Geosciences, China University of Petroleum (East China), Qingdao 266580, China; Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China. Electronic address: zhfxy_cn@upc.edu.cn.
authors.forename: Feng
authors.initials: F
authors.lastname: Zhang
authors.affiliation: Exploration and Development Research Institute, Tarim Oilfield, PetroChina, Korla 841000, China.
authors.forename: Hongbo
authors.initials: H
authors.lastname: Guo
authors.affiliation: Exploration and Development Research Institute, Tarim Oilfield, PetroChina, Korla 841000, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Xin
authors.affiliation: Exploration and Development Research Institute, Tarim Oilfield, PetroChina, Korla 841000, China.
authors.forename: Zhongyue
authors.initials: Z
authors.lastname: Han
keywords: Density well logging; Focused gamma ray beam angle; Logging response; Monte Carlo simulation; Source collimator