基于数值模式匹配法的过套管电阻率测井响应层厚和围岩影响
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摘要
过套管电阻率测井能够有效测量金属套管外地层电阻率,对国内油气田的剩余油评价和动态监测具有重要意义。采用数值模式匹配法(NMM)对层厚和围岩对过套管电阻率测井响应的影响进行了分析,数值模拟结果表明当目标地层厚度大于电极距时,地层和围岩电阻率的差异对测井影响不明显,视电阻率曲线可以反映真实的地层信息。当目标地层厚度小于电极距时,地层和围岩电阻率的差异越大,测井响应数值和地层真实值差别越显著。在数值计算的基础上建立了层厚和围岩影响校正图版,提出了采用校正图版进行层厚和围岩校正的方法。
Through casing resistivity logging can measure the layer resistivity efficiently, so it has great significance on the residual oil evaluation and dynamic monitor. In this paper the influence of layer thickness and surrounding rock on through casing resistivity logging response is analyzed based on numerical mode-matching method(NMM). The results show that when the layer thickness is larger than electrode distance, the difference between layer and surrounding rock has little effect on the logging response. When the layer is smaller than the electrode distance, the apparent resistivity deviates from the real value of layer more obvious when the difference between layer and surrounding rock becomes larger. Based on numerical computing resultsly, as correction plate is established and corresponding correction method is proposed to correct the results due to the influence of layer thickness and surrounding rock.
Through casing resistivity logging can measure the layer resistivity efficiently, so it has great significance on the residual oil evaluation and dynamic monitor. In this paper the influence of layer thickness and surrounding rock on through casing resistivity logging response is analyzed based on numerical mode-matching method(NMM). The results show that when the layer thickness is larger than electrode distance, the difference between layer and surrounding rock has little effect on the logging response. When the layer is smaller than the electrode distance, the apparent resistivity deviates from the real value of layer more obvious when the difference between layer and surrounding rock becomes larger. Based on numerical computing resultsly, as correction plate is established and corresponding correction method is proposed to correct the results due to the influence of layer thickness and surrounding rock.
引文
[1]谭茂金,张庚骥.用模式匹配法计算电阻率测井响应研究进展[J].地球物理学进展,2006,21(1):208-213.Tan Maojin,Zhang Gengji.Progress in numerical mode-matching method of electrical logs[J].Progress in Geophysics,2006,21(1):208-213.
[2]刘福平,陈小安,杨长春.过套管电阻率测井响应数值模拟研究进展[J].地球物理学进展,2011,26(6):2018-2025.Liu Fuping,Chen Xiaoan,Yang Changchun.The progress on calculation of resistivity logging response through casing[J].Progress in Geophysics,2011,26(6):2018-2025.
[3]谢树棋,储昭坦,李克沛,等.套管井电阻率测井方法研究[J].测井技术,1999,23(5):338-343.Xie Shuqi,Chu Zhaotan,Li Kepei,et al.On methodology of resistivity logging through casing[J].Well Logging Technology,1999,23(5):338-343.
[4]Padensi M A.Method to calculate the reflection and transmission of guide waves[J].Journal of the Optical Society of America,1982,72(1):126-130.
[5]Chew W C,Barone S,Anderson B,et al.Diffraction of axisymmetric waves in a borehole by bed boundary dis-continuities[J].Geophysics,1984,49(1):1586-1595.
[6]Tsang L,Chan A K,Gianzero S.Solution of the fundamental problem in resistivity logging with a hybrid method[J].Geophysics,1984,49(24):1596-1604.
[7]张庚骥,汪涵明,汪功礼.成层介质中交流电测井响应[J].地球物理学报,1995,38(6):840-849.Zhang Gengji,Wang Hanming,Wang Gongli.AC logging responses in layered media[J].Chinese Journal of Geophysics,1995,38(6):840-849.
[8]张庚骥,汪涵明.普通电阻率测井的数值模式匹配解法[J].石油大学学报,1996,20(2):23-29.Zhang Gengji,Wang Hanming.Solution of the Normal resistivity logging with the numerical mode-matching method[J].Journal of the University of Petroleum,1996,20(2):23-29.
[9]谭茂金,张庚骥,谢关宝.电阻率测井三维模式匹配法中的平面数值分析[J].中国石油大学学报,2007,31(2):59-63.Tan Maojin,Zhang Gengji,Xie Guanbao.Numerial analysis of 3-D numerical mode-matching method in resistivity logs[J].Journal of the University of Petroleum,2007,31(2):59-63.
[10]谭茂金,张庚骥,运华云,等.非轴对称条件下用三维模式匹配法计算电阻率测井响应[J].地球物理学报,2007,50(3):939-945.Tan Maojin,Zhang Gengji,Yun Huayun,et al.3-D numerical mode-matching(NMM)method for resistivity logging responses in nonsymmetric conditions[J].Chinese Journal of Geophysics,2007,50(3):939-945.
[11]刘宇,刘国强.基于NMM法的水泥环过套管电阻率测井影响及校正研究[J].现代科学仪器,2013(3):49-52.Liu Yu,Liu Guoqiang.Research on cement sheath influence and correction for through-casing resistivity logging based on NMM[J].Modern Scientific Instruments,2013(3):49-52.
[12]张庚骥.电测井算法[M].北京:石油工业出版社,2009.
[2]刘福平,陈小安,杨长春.过套管电阻率测井响应数值模拟研究进展[J].地球物理学进展,2011,26(6):2018-2025.Liu Fuping,Chen Xiaoan,Yang Changchun.The progress on calculation of resistivity logging response through casing[J].Progress in Geophysics,2011,26(6):2018-2025.
[3]谢树棋,储昭坦,李克沛,等.套管井电阻率测井方法研究[J].测井技术,1999,23(5):338-343.Xie Shuqi,Chu Zhaotan,Li Kepei,et al.On methodology of resistivity logging through casing[J].Well Logging Technology,1999,23(5):338-343.
[4]Padensi M A.Method to calculate the reflection and transmission of guide waves[J].Journal of the Optical Society of America,1982,72(1):126-130.
[5]Chew W C,Barone S,Anderson B,et al.Diffraction of axisymmetric waves in a borehole by bed boundary dis-continuities[J].Geophysics,1984,49(1):1586-1595.
[6]Tsang L,Chan A K,Gianzero S.Solution of the fundamental problem in resistivity logging with a hybrid method[J].Geophysics,1984,49(24):1596-1604.
[7]张庚骥,汪涵明,汪功礼.成层介质中交流电测井响应[J].地球物理学报,1995,38(6):840-849.Zhang Gengji,Wang Hanming,Wang Gongli.AC logging responses in layered media[J].Chinese Journal of Geophysics,1995,38(6):840-849.
[8]张庚骥,汪涵明.普通电阻率测井的数值模式匹配解法[J].石油大学学报,1996,20(2):23-29.Zhang Gengji,Wang Hanming.Solution of the Normal resistivity logging with the numerical mode-matching method[J].Journal of the University of Petroleum,1996,20(2):23-29.
[9]谭茂金,张庚骥,谢关宝.电阻率测井三维模式匹配法中的平面数值分析[J].中国石油大学学报,2007,31(2):59-63.Tan Maojin,Zhang Gengji,Xie Guanbao.Numerial analysis of 3-D numerical mode-matching method in resistivity logs[J].Journal of the University of Petroleum,2007,31(2):59-63.
[10]谭茂金,张庚骥,运华云,等.非轴对称条件下用三维模式匹配法计算电阻率测井响应[J].地球物理学报,2007,50(3):939-945.Tan Maojin,Zhang Gengji,Yun Huayun,et al.3-D numerical mode-matching(NMM)method for resistivity logging responses in nonsymmetric conditions[J].Chinese Journal of Geophysics,2007,50(3):939-945.
[11]刘宇,刘国强.基于NMM法的水泥环过套管电阻率测井影响及校正研究[J].现代科学仪器,2013(3):49-52.Liu Yu,Liu Guoqiang.Research on cement sheath influence and correction for through-casing resistivity logging based on NMM[J].Modern Scientific Instruments,2013(3):49-52.
[12]张庚骥.电测井算法[M].北京:石油工业出版社,2009.