阵列侧向测井正演响应分析及环境因素快速校正方法研究

doi:10.11720/wtyht.2019.0095

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摘要

电阻率测井资料是定性划分油气层和定量计算含油饱和度的重要依据,但电阻率测井资料易受到环境因素的影响,造成资料失真。本文以阵列侧向测井仪器EALT(elis array laterolog tool)为例(测量MLR1-MLR4四条视电阻率曲线),基于有限元数值模拟方法,研究了井眼、围岩、泥浆侵入对其响应的影响。计算结果表明,MLR1、MLR2、MLR3当井径大于8 in后即明显受到井眼影响,MLR4基本不受井径的影响,在高阻泥浆环境中测量结果严重失真;MLR1、MLR2、MLR3、MLR4当层厚小于0.4 m时受层厚影响严重;围岩电阻率与目的层电阻率差别越大,ELAT响应受到影响越大;MLR1-MLR3在侵入半径小于30 in时受其影响较大,地层电阻率与侵入带电阻率比值分别达到5、10、100后,视电阻率失真程度可达50%以上。基于正演分析,计算绘制了井眼、围岩、泥浆侵入影响校正图版,并针对较复杂的围岩校正图版提出了快速校正方法,可对阵列侧向测井资料环境因素校正提供一定参考。

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	刘迪仁

关键词 ：阵列侧向测井, 井眼, 围岩, 泥浆侵入, 校正图版

Abstract：

Resistivity logging data constitute an important basis for qualitative division of oil and gas reservoirs and quantitative calculation of oil saturation. However, resistivity logging data are vulnerable to environmental factors, which results in distortion of resistivity logging data. Taking array laterolog instrument as an example and based on finite element numerical simulation method, te authors studied the influence of borehole, surrounding rock and mud intrusion on its response. The results show that MLR1, MLR2 and MLR3 are obviously affected by borehole diameter when the borehole diameter is greater than 8 minutes, MLR4 is basically not affected by borehole diameter, and EALT results in high resistance mud environment are seriously distorted. MLR1, MLR2, MLR3 and MLR4 are seriously affected by the thickness of the layer when the thickness of the layer is less than 0.4m. The larger the difference of resistivity between the surrounding rock and the target layer, the greater the influence of ELAT response. When the invasion radius is less than 30 minutes, R1-MLR3 is greatly affected. When the ratio of formation resistivity to invasion zone resistivity reaches 5,10,100, the apparent resistivity distortion can be higher than 50%. Based on forward analysis, the authors drew the correction chart of EALT wellbore, surrounding rock and mud invasion and propose a fast correction method for the complex correction chart of surrounding rock, which can provide some reference for the correction of environmental factors of EALT logging data.

Key words： array laterolog borehole surrounding rock mud invasion correction chart

收稿日期: 2019-02-25 出版日期: 2019-10-25

P631

基金资助:国家重大专项项目“南海东部海域勘探新领域及关键技术”(2016ZX05024-004-006);国家重点研发计划项目(2018YFC0603300)

通讯作者: 刘迪仁

作者简介: 冯进(1972-),男,高级工程师,硕士,现主要从事地球物理测井相关工作。Email: fengjin@cnooc.com.cn

引用本文:

冯进, 倪小威, 杨清, 管耀, 刘迪仁. 阵列侧向测井正演响应分析及环境因素快速校正方法研究[J]. 物探与化探, 2019, 43(5): 1097-1104.
Jin FENG, Xiao-Wei NI, Qing YANG, Yao GUAN, Di-Ren LIU. Forward analysis of array laterolog and rapid correction of environmental factors. Geophysical and Geochemical Exploration, 2019, 43(5): 1097-1104.

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https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2019.0095 或 https://www.wutanyuhuatan.com/CN/Y2019/V43/I5/1097

Fig.1 电极系结构

Fig.2 地层模型

Fig.3 井眼的影响
a—井径的影响;b—泥浆电阻率的影响

Fig.4 井眼校正图版

Fig.5 围岩的影响
a—层厚的影响; b—围岩电阻率的影响

Fig.6 围岩校正图版

Table 1 MLR1围岩校正系数(0.1 m≤H≤0.4 m)

Table 2 MLR1围岩校正系数(0.4 m≤H≤1 m)

Table 3 MLR1围岩校正系数表(1 m≤H≤2 m)

Fig.7 泥浆侵入的影响
a—侵入半径的影响;b—侵入带电阻率的影响

Fig.8 泥浆侵入校正图版

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