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        3. [1]康曉泉,伍東,趙秀峰,等.地層各組分熱中子宏觀俘獲截面Σ值的最優化確定[J].測井技術,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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          地層各組分熱中子宏觀俘獲截面Σ值的最優化確定()
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          《測井技術》[ISSN:1004-1338/CN:61-1223/TE]

          卷:
          第42卷
          期數:
          2018年06期
          頁碼:
          658-661
          欄目:
          處理解釋
          出版日期:
          2018-12-31

          文章信息/Info

          Title:
          Optimization of Regional Formation Parameter-Σ and Its Applications
          文章編號:
          1004-1338(2018)06-0658-04
          作者:
          康曉泉伍東趙秀峰何志明盧炳文
          中國石油集團長城鉆探工程公司國際測井公司,北京100101
          Author(s):
          KANG XiaoquanWU DongZHAO XiufengHE ZhimingLU Bingwen
          Great Wall Drilling Corporation, International Logging Company, Beijing 100101, China
          關鍵詞:
          測井解釋地層組分Σ參數最優化套后飽和度
          Keywords:
          log interpretation formation composition Σ optimization formation saturation behind casing
          分類號:
          P63184
          DOI:
          10.16489/j.issn.1004-1338.2018.06.009
          文獻標志碼:
          A
          摘要:
          由于含氫量和地層水礦化度不同,地層各組分的熱中子宏觀俘獲截面Σ參數有一個變化范圍,導致PNN定量計算套后飽和度時選取組分參數的不確定性。傳統方法輸入骨架Σ數值,根據公式、圖版等計算、讀取相關Σ數值,實際資料處理結果表明計算結果殘差偏大。計算Σ的方程組是一個超定方程組,存在地層組分Σ參數的最優解。采用歸一化的非線性最小二乘法原理,在PNN測井解釋中,對區域地層各組分的Σ參數進行了優化計算。討論最優化方程建立、參數初始值確定、約束條件和選擇深度點的原則。組分參數反映地區巖石物理特征,可以更準確地計算套后飽和度。可以利用該思路進行最優化計算確定。
          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.

          參考文獻/References:

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          備注/Memo

          備注/Memo:
          第一作者:康曉泉,男,1979年生,高級工程師,從事測井資料處理與解釋研究工作。[email protected]
          更新日期/Last Update: 2018-12-31
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