Petroleum Science >2012,??Issue 4:??463-468 DOI: https://doi.org/10.1007/s12182-012-0231-8
Calculating standard captured γ spectra offormation elements Open?Access
文章信息
作者：Wu Wensheng,Xiao Lizhi,Zhang Lijuan and Niu Wei
作者單位：
State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China ?;State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China ?;State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China ?;State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China ?
投稿時間：2012-01-05
引用方式：Wu, W., Xiao, L., Zhang, L. et al. Pet. Sci. (2012) 9: 463. https://doi.org/10.1007/s12182-012-0231-8
文章摘要
Multi-element gamma-ray spectrum logging requires standard spectra of individual elements
for its interpretation. Since the standard element spectra are usually derived using Monte Carlo simulation
of either a pure element or its oxide, we synthesized the standard neutron captured γ spectra (as would
be observed using a NaI(Tl) detector) of elements H, Si, Ca and Fe from each element and its oxide. To
compare the standard spectra from the elements and oxides, we operated three simulations of sandstone,
limestone and mixed formation of sandstone and limestone each with ten different porosities, and used
the two kinds of standard spectra to analyze the mixed spectra modeled from sandstone and limestone
formations. The results show that the standard element spectra from oxides have more prominent energy
peaks than the standard spectra from pure elements. The calculated formation element contents are close
to the theoretical values when the standard element spectra from oxides are used to analyze the formation
mixed spectra. Therefore, the formation element standard spectra should be calculated from oxide models
in the analysis of neutron captured γ spectra by logging tools.
for its interpretation. Since the standard element spectra are usually derived using Monte Carlo simulation
of either a pure element or its oxide, we synthesized the standard neutron captured γ spectra (as would
be observed using a NaI(Tl) detector) of elements H, Si, Ca and Fe from each element and its oxide. To
compare the standard spectra from the elements and oxides, we operated three simulations of sandstone,
limestone and mixed formation of sandstone and limestone each with ten different porosities, and used
the two kinds of standard spectra to analyze the mixed spectra modeled from sandstone and limestone
formations. The results show that the standard element spectra from oxides have more prominent energy
peaks than the standard spectra from pure elements. The calculated formation element contents are close
to the theoretical values when the standard element spectra from oxides are used to analyze the formation
mixed spectra. Therefore, the formation element standard spectra should be calculated from oxide models
in the analysis of neutron captured γ spectra by logging tools.
關鍵詞
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Standard spectrum, spectrum analysis, neutron captured γ spectrum, formation element