利用黏滞剩磁进行水平地应力定向的试验研究
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摘要
为了快速准确地对地层水平地应力进行定向,指导页岩气的水力压裂开采,研究利用岩心的黏滞剩磁定向方法。该方法可以克服一般古地磁定向的不足,在不考虑地层年代和复杂构造运动的情况下还原岩心在地层中的原始方位。利用热退磁手段分离出黏滞剩磁,对岩心进行定向,并对取自重庆涪陵地区某页岩气井多个层位的岩心进行了古地磁测试。结合声发射Kaiser效应测得的地应力资料,对测试结果进行处理,得到取心层位最大水平主应力的方位角,与先期地震资料的结果进行比较,二者具有较好的一致性。研究结果表明,利用黏滞剩磁进行水平地应力定向的方法是可行、而且有效的。
In order to determine the orientation of horizontal in-situ stress conveniently and accurately,and provide help in hydraulic fracturing of shale gas,a technique called Viscous Remnant Magnetization(VRM)was investigated.Compared with conventional methods,VRM can help to provide the determination of core orientation without considering the deposit age and tectonic movement of the formation.In the experiment,the procedure of thermal demagnetization was introduced in detail to extract VRM for core orientation determination from a shale gas well in Fuling of Sichuan basin.Combining the results of Kaiser effect,the orientation of maximum horizontal stress was obtained.It indicated that results from VRM were basically consistent with those from seismic data.So it is feasible and effective to utilize VRM horizontal insitu stress orientation determination.
In order to determine the orientation of horizontal in-situ stress conveniently and accurately,and provide help in hydraulic fracturing of shale gas,a technique called Viscous Remnant Magnetization(VRM)was investigated.Compared with conventional methods,VRM can help to provide the determination of core orientation without considering the deposit age and tectonic movement of the formation.In the experiment,the procedure of thermal demagnetization was introduced in detail to extract VRM for core orientation determination from a shale gas well in Fuling of Sichuan basin.Combining the results of Kaiser effect,the orientation of maximum horizontal stress was obtained.It indicated that results from VRM were basically consistent with those from seismic data.So it is feasible and effective to utilize VRM horizontal insitu stress orientation determination.
引文
[1]陈勉,金衍,张广清.石油工程岩石力学[M].北京:科学出版社,2008:67.Chen Mian,Jin Yan,Zhang Guangqing.Rock mechanics in petroleum engineering[M].Beijing:Science Press,2008:67.
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[3]葛洪魁,林英松,王顺昌.水力压裂地应力测量有关技术问题的讨论[J].石油钻采工艺,1998,20(6):53-56.Ge Hongkui,Lin Yingsong,Wang Shunchang.Discussion on technical problems related to measurement of earth stress through hydraulic fracturing[J].Oil Drilling&Production Technology,1998,20(6):53-56.
[4]谢润成,周文,杨志彬.非定向全直径岩心现今地应力特征试验测试一体化研究[J].石油钻探技术,2010,38(4):108-111.Xie Runcheng,Zhou Wen,Yang Zhibin.Research on integrated test of in-situ stress from unoriented core[J].Petroleum Drilling Techniques,2010,38(4):108-111.
[5]吴超,刘建华.区域油田地应力及井壁稳定性综合预测方法[J].断块油气田,2011,18(6):705-709.Wu Chao,Liu Jianhua.Predicting method of regional in-situ stress of oilfield and borehole stability[J].Fault-Block Oil&Gas Field,2011,18(6):705-709.
[6]李光泉,王怡,陈海军,等.利用井眼坍塌信息求取最大水平主应力的方法[J].石油钻探技术,2012,40(1):37-41.Li Guangquan,Wang Yi,Chen Junhai,et al.Analysis of the maximum horizontal principal stress based on wellbore collapse information[J].Petroleum Drilling Techniques,2012,40(1):37-41.
[7]鲍洪志,孙连环,于玲玲,等.利用岩石声发射Kaiser效应求取地应力[J].断块油气田,2009,16(6):94-96.Bao Hongzhi,Sun Lianhuan,Yu Lingling,et al.Obtainment of ground stress by Kaiser effect of rock acoustic emission[J].Fault-Block Oil&Gas Field,2009,16(6):94-96.
[8]侯守信,田国荣.粘滞剩磁(VRM)岩芯定向的应用[J].岩石力学与工程学报,2000,19(增刊1):1128-1131.Hou Shouxin,Tian Guorong.The application of viscous remanent magnetization in orientation determination by using drill cores[J].Chinese Journal of Rock Mechanics and Engineering,2009,19(Supplement 1):1128-1131.
[9]Aidona E,Kondopoulou D.Palaeomagnetic and rock magnetic properities of sediment cores from Chalkidiki,Greece[J].Phys.Chem.Earth:A,2001,26(11/12):879-884.
[10]董平川.利用岩芯古地磁定向研究油藏水平主应力方向[J].岩石力学与工程学报,2004,23(14):2480-2483.Dong Pingchuan.Orientation determination of maximum horizontal stress in reservior formation by paleomagnetic orientation of cores[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(14):2480-2483.
[11]张家振,陈勉,鲍洪志,等.非定向岩心粘滞剩磁重定向方法[J].油气地球物理,2008,6(2):14-18.Zhang Jiazhen,Chen Mian,Bao Hongzhi,et al.The viscous remanence method applied to redirect non-oriented core[J].Petroleum Geophysics,2008,6(2):14-18.
[12]李学森,吴汉宁,张小浩,等.钻井岩心重定向的古地磁方法及其可靠性研究[J].油气地球物理,2006,4(2):24-32.Li Xuesen,Wu Hanning,Zhang Xiaohao,et al.The paleomagnetic method applied to reorient core and its reliability[J].Petroleum Geophysics,2006,4(2):24-32.
[13]徐世浙.古地磁学概论[M].北京:地震出版社,1982:14-49.Xu Shizhe.Introduction to paleomagnetism[M].Beijing:Seismological Press,1982:14-49.
[14]刘椿.古地磁学导论[M].北京:科学出版社,1991:30-31.Liu Chun.Paleomagnetism guide[M].Beijing:Science Press,1991:30-31.
[15]DD 2006-04古地磁测试技术要求[S].DD 2006-04Technical requirement of paleomagnetism testing[S].
[2]谢润成,周文,邓虎成,等.现今地应力场特征评价一体化研究[J].石油钻采工艺,2008,30(4):32-35.Xie Runcheng,Zhou Wen,Deng Hucheng,et al.Integrated research methods of in-situ stress field characteristics[J].Oil Drilling&Production Technology,2008,30(4):32-35.
[3]葛洪魁,林英松,王顺昌.水力压裂地应力测量有关技术问题的讨论[J].石油钻采工艺,1998,20(6):53-56.Ge Hongkui,Lin Yingsong,Wang Shunchang.Discussion on technical problems related to measurement of earth stress through hydraulic fracturing[J].Oil Drilling&Production Technology,1998,20(6):53-56.
[4]谢润成,周文,杨志彬.非定向全直径岩心现今地应力特征试验测试一体化研究[J].石油钻探技术,2010,38(4):108-111.Xie Runcheng,Zhou Wen,Yang Zhibin.Research on integrated test of in-situ stress from unoriented core[J].Petroleum Drilling Techniques,2010,38(4):108-111.
[5]吴超,刘建华.区域油田地应力及井壁稳定性综合预测方法[J].断块油气田,2011,18(6):705-709.Wu Chao,Liu Jianhua.Predicting method of regional in-situ stress of oilfield and borehole stability[J].Fault-Block Oil&Gas Field,2011,18(6):705-709.
[6]李光泉,王怡,陈海军,等.利用井眼坍塌信息求取最大水平主应力的方法[J].石油钻探技术,2012,40(1):37-41.Li Guangquan,Wang Yi,Chen Junhai,et al.Analysis of the maximum horizontal principal stress based on wellbore collapse information[J].Petroleum Drilling Techniques,2012,40(1):37-41.
[7]鲍洪志,孙连环,于玲玲,等.利用岩石声发射Kaiser效应求取地应力[J].断块油气田,2009,16(6):94-96.Bao Hongzhi,Sun Lianhuan,Yu Lingling,et al.Obtainment of ground stress by Kaiser effect of rock acoustic emission[J].Fault-Block Oil&Gas Field,2009,16(6):94-96.
[8]侯守信,田国荣.粘滞剩磁(VRM)岩芯定向的应用[J].岩石力学与工程学报,2000,19(增刊1):1128-1131.Hou Shouxin,Tian Guorong.The application of viscous remanent magnetization in orientation determination by using drill cores[J].Chinese Journal of Rock Mechanics and Engineering,2009,19(Supplement 1):1128-1131.
[9]Aidona E,Kondopoulou D.Palaeomagnetic and rock magnetic properities of sediment cores from Chalkidiki,Greece[J].Phys.Chem.Earth:A,2001,26(11/12):879-884.
[10]董平川.利用岩芯古地磁定向研究油藏水平主应力方向[J].岩石力学与工程学报,2004,23(14):2480-2483.Dong Pingchuan.Orientation determination of maximum horizontal stress in reservior formation by paleomagnetic orientation of cores[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(14):2480-2483.
[11]张家振,陈勉,鲍洪志,等.非定向岩心粘滞剩磁重定向方法[J].油气地球物理,2008,6(2):14-18.Zhang Jiazhen,Chen Mian,Bao Hongzhi,et al.The viscous remanence method applied to redirect non-oriented core[J].Petroleum Geophysics,2008,6(2):14-18.
[12]李学森,吴汉宁,张小浩,等.钻井岩心重定向的古地磁方法及其可靠性研究[J].油气地球物理,2006,4(2):24-32.Li Xuesen,Wu Hanning,Zhang Xiaohao,et al.The paleomagnetic method applied to reorient core and its reliability[J].Petroleum Geophysics,2006,4(2):24-32.
[13]徐世浙.古地磁学概论[M].北京:地震出版社,1982:14-49.Xu Shizhe.Introduction to paleomagnetism[M].Beijing:Seismological Press,1982:14-49.
[14]刘椿.古地磁学导论[M].北京:科学出版社,1991:30-31.Liu Chun.Paleomagnetism guide[M].Beijing:Science Press,1991:30-31.
[15]DD 2006-04古地磁测试技术要求[S].DD 2006-04Technical requirement of paleomagnetism testing[S].
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