[1]康晓泉,伍东,赵秀峰,等.地层各组分热中子宏观俘获截面Σ值的最优化确定[J].测井技术,2018,42(06):658-661.[doi:10.16489/j.issn.1004-1338.2018.06.009]
 KANG Xiaoquan,WU Dong,ZHAO Xiufeng,et al.Optimization of Regional Formation Parameter-Σ and Its Applications[J].WELL LOGGING TECHNOLOGY,2018,42(06):658-661.[doi:10.16489/j.issn.1004-1338.2018.06.009]
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地层各组分热中子宏观俘获截面Σ值的最优化确定()
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《测井技术》[ISSN:1004-1338/CN:61-1223/TE]

卷:
第42卷
期数:
2018年06期
页码:
658-661
栏目:
处理解释
出版日期:
2018-12-31

文章信息/Info

Title:
Optimization of Regional Formation Parameter-Σ and Its Applications
文章编号:
1004-1338(2018)06-0658-04
作者:
康晓泉伍东赵秀峰何志明卢炳文
中国石油集团长城钻探工程公司国际测井公司,北京100101
Author(s):
KANG XiaoquanWU DongZHAO XiufengHE ZhimingLU Bingwen
Great Wall Drilling Corporation, International Logging Company, Beijing 100101, China
关键词:
测井解释地层组分Σ参数最优化套后饱和度
Keywords:
log interpretation formation composition Σ optimization formation saturation behind casing
分类号:
P63184
DOI:
10.16489/j.issn.1004-1338.2018.06.009
文献标志码:
A
摘要:
由于含氢量和地层水矿化度不同,地层各组分的热中子宏观俘获截面Σ参数有一个变化范围,导致PNN定量计算套后饱和度时选取组分参数的不确定性。传统方法输入骨架Σ数值,根据公式、图版等计算、读取相关Σ数值,实际资料处理结果表明计算结果残差偏大。计算Σ的方程组是一个超定方程组,存在地层组分Σ参数的最优解。采用归一化的非线性最小二乘法原理,在PNN测井解释中,对区域地层各组分的Σ参数进行了优化计算。讨论最优化方程建立、参数初始值确定、约束条件和选择深度点的原则。组分参数反映地区岩石物理特征,可以更准确地计算套后饱和度。可以利用该思路进行最优化计算确定。
Abstract:
Due to the difference in hydrogen content and formation water salinity, the thermal neutron macro-capture cross section (Σ)of each component of the formation have a range of variation. When using PNN logging to quantitatively calculate the saturation behind the casing, the uncertainty of Σ can cause a certain amount of error in the result. The traditional method for determining the Σ is as follows: First, input the Σ of matrix, and then calculate and read the corresponding Σ according to the formula and the plate, but the actual application shows that the result residual is too large. Based on the study, it is found that the equations for calculating Σ are an overdetermined system of equations, so there must be an optimal solution for the Σ. Therefore, during the PNN logging interpretation, the normalized nonlinear least squares principle is used in this paper to optimize Σ of each component. In addition, the paper also discusses the establishment of optimization equations, the determination of initial parameter value, constraints and the principle of selecting depth points. The application results show that the Σ obtained by this method can reflect the petrophysical characteristics in the study area, which provides a basis for more accurate calculation of the formation saturation behind the casing. This method can also be applied when other logging curves such as natural gamma, neutrons, etc. vary with the parameters of the area and the composition of the formation.

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备注/Memo

备注/Memo:
第一作者:康晓泉,男,1979年生,高级工程师,从事测井资料处理与解释研究工作。kangxiaoquan@cnlc.cn
更新日期/Last Update: 2018-12-31