A design of source spacing of the X-ray density logging tool based on numerical simulation

Table 1. Detector parameters of X-ray density logging tool
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Table 1. Detector parameters of X-ray density logging tool
探测器Detector 尺寸Size / mm
晶体材料
Crystal material
SSP_X ø38×28.6 NaI
BSP_X ø38×28.6 NaI
MSP_X ø38×58 NaI

Table 2. Efficiency of each detector of gamma density tool
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Table 2. Efficiency of each detector of gamma density tool
组别
Group
短源距组Short
spacing group
长源距组Long
spacing group
γ密度仪器探测器
Gamma density tool
$S S P_{g}$ $B S P_{g}$ $M S P_{g}$ $L S P_{g}$
探测效率
Detector efficiency
6.45×10^-5 1.49×10^-5 2.03×10^-5 5.39×10^-7

Table 3. Source spacing range satisfying index of detection efficiency in X-ray tool

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Table 3. Source spacing range satisfying index of detection efficiency in X-ray tool

组别Group

短源距组Short spacing group

长源距组Long

spacing group

X射线密度仪器探测器

Detector of X-ray density tool

S S P_{X}

B S P_{\begin{matrix} X \end{matrix}}

M S P_{\begin{matrix} X \end{matrix}}

源距范围Range of source distance / mm

[0, 270]

[0, 344]

Table 4. The formation density sensitive of each detector of gamma density tool

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Table 4. The formation density sensitive of each detector of gamma density tool

组别

Group

短源距组Short spacing group

长源距组

Long spacing group

γ密度仪器探测器

Gamma density tool

S S P_{\begin{matrix} g \end{matrix}}

B S P_{\begin{matrix} g \end{matrix}}

M S P_{\begin{matrix} g \end{matrix}}

L S P_{\begin{matrix} g \end{matrix}}

地层密度灵敏度Density sensitive of formation

0.480 2

0.846 8

1.499 8

2.616 9

Table 5. The source spacing range satisfying index of formation density sensitive in X-ray tool

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Table 5. The source spacing range satisfying index of formation density sensitive in X-ray tool

组别

Group

短源距组Short spacing group

长源距组Long spacing group

X射线密度仪器探测器Detector of X-ray density tool

S S P_{\begin{matrix} X \end{matrix}}

B S P_{\begin{matrix} X \end{matrix}}

M S P_{\begin{matrix} X \end{matrix}}

源距范围Range of source distance / mm

[0, 201]

[230, 386]

[274, 430]

Table 6. The DOI of the short source spacing detector in the gamma density tool
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Table 6. The DOI of the short source spacing detector in the gamma density tool
组别
Group
短源距组
Short spacing group
γ仪器探测器
Gamma tool detector
$S S P_{\begin{matrix} g \end{matrix}}$ $B S P_{\begin{matrix} g \end{matrix}}$
探测深度
Depth of investigation / mm
101 110

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Huilin WU, Yulian LI, Ya JIN, Qiong ZHANG. A design of source spacing of the X-ray density logging tool based on numerical simulation[J]. NUCLEAR TECHNIQUES, 2022, 45(10): 100402

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