title: Numerical study on determining formation porosity using a boron capture gamma ray technique and MCNP.
abstract: Formation porosity can be determined using the boron capture gamma ray counting ratio with a near to far detector in a pulsed neutron-gamma element logging tool. The thermal neutron distribution, boron capture gamma spectroscopy and porosity response for formations with different water salinity and wellbore diameter characteristics were simulated using the Monte Carlo method. We found that a boron lining improves the signal-to-noise ratio and that the boron capture gamma ray counting ratio has a higher sensitivity for determining porosity than total capture gamma.
authors.affiliation: School of Geosciences, China University of Petroleum, Qingdao 266580, Shandong Province, China.
authors.forename: Juntao
authors.initials: J
authors.lastname: Liu
authors.affiliation: School of Geosciences, China University of Petroleum, Qingdao 266580, Shandong Province, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Zhang
authors.affiliation: School of Geosciences, China University of Petroleum, Qingdao 266580, Shandong Province, China.
authors.forename: Xinguang
authors.initials: X
authors.lastname: Wang
authors.affiliation: School of Geosciences, China University of Petroleum, Qingdao 266580, Shandong Province, China.
authors.forename: Fei
authors.initials: F
authors.lastname: Han
authors.affiliation: School of Geosciences, China University of Petroleum, Qingdao 266580, Shandong Province, China.
authors.forename: Zhelong
authors.initials: Z
authors.lastname: Yuan
keywords: Boron lining; Capture gamma ray; Monte Carlo simulation; Porosity