基于Gray方程的三参量AVO反演及煤层气富集区预测
|
摘要
通过AVO(Amplitude Versus Offset)反演可直接求取煤层气储层的弹性参数,指导储层的评价工作。在介绍Gray近似方程的基础上,应用该方程进行了三参量AVO反演方法的研究,直接计算出了煤层气储层的密度、体积模量和剪切模量;依据煤层气富集区3个弹性参数的特征,对比求取3个弹性参数剖面后,圈定出煤层气富集区;最后,通过模型和实例分析,验证该方法的可行性。
Elastic parameters of coal reservoir can be got directly through AVO inversion to guide the evaluation of reservoir. Based on the introduction of the Gray approximate equation, the equation is used to study the three-parameter AVO inversion, the density, the bulk modulus and the shear modulus of CBM reservoir can be calculated directly. According to the characteristics of three elastic parameters in CBM enrichment zone, CBM enrichment zone was delineated after comparing the three elastic parameters. Finally,through model and case analysis, the feasibility of the method was verified.
Elastic parameters of coal reservoir can be got directly through AVO inversion to guide the evaluation of reservoir. Based on the introduction of the Gray approximate equation, the equation is used to study the three-parameter AVO inversion, the density, the bulk modulus and the shear modulus of CBM reservoir can be calculated directly. According to the characteristics of three elastic parameters in CBM enrichment zone, CBM enrichment zone was delineated after comparing the three elastic parameters. Finally,through model and case analysis, the feasibility of the method was verified.
引文
[1]覃思.煤层气AVO研究与应用[D].成都:成都理工大学,2008:3–35.
[2]HILTERMAN F J.地震振幅解释[M].孙夕平,赵良武,译.北京:石油工业出版社,2006:51–64.
[3]陈同俊.P波方位AVO理论及煤层裂隙探测技术[M].徐州:中国矿业大学出版社,2009:16–20.
[4]GOODWAY B,CHEN T,DOWNTON J.Improved AVO fluid detection and lithology discrimination using Lamépetrophysical parameters[C]//67th Annual International SEG meeting.1997:183–186.
[5]陈建江.AVO三参数反演方法研究[D].北京:中国石油大学,2007:11–21.
[6]GRAY D,GOODWAY B,CHEN Taiwen.Bridging the gap:Using AVO to detect changes in fundamental elastic constants[C]//69th Annual Internet Expanded Abstract.1999:852–855.
[7]张玉华.基于岩石物理的AVO正演模拟研究[D].北京:中国石油大学,2007:27–43.
[8]王一兵,田广文,李五忠.中国煤层气选区评价标准探讨[J].地质通报,2006,25(9/10):1104–1107.WANG Yibing,TIAN Guangwen,LI Wuzhong.Criteria for the evaluation of coalbed methane area selection in China[J].Geological Bulletin of China,2006,25(9/10):1104–1107.
[9]王红岩,李贵中,李景明.中国煤层气的富集特征[J].中国煤层气,2006,3(2):7–10.WANG Hongyan,LI Guizhong,LI Jingming.Characteristics of CBM enrichment in China[J].China Coalbed Methane,2006,3(2):7–10.
[10]彭苏萍,高云峰.含煤地层振幅随偏移距变化正演模型研究[J].科学通报,2005,50(1):131–137.PENG Suping,GAO Yunfeng.Research of amplitude variation with offset by forward modeling[J].Chinese Science Bulletin,2005,50(1):131–137.
[11]彭苏萍,杜文凤,苑春方.不同结构类型煤体地球物理特征差异分析和纵横波联合识别与预测方法研究[J].地质学报,2008,82(10):1311–1322.PENG Suping,DU Wenfeng,YUAN Chunfang.Identification and forecasting of different structural coals by P-wave and S-wave from well-logging[J].Acta Geologica Sinica,2008,82(10):1311–1322.
[12]王保丽,印兴耀,张繁昌.基于Gray近似的弹性波阻抗方程及反演[J].石油地球物理勘探,2007,42(4):435–439.WANG Baoli,YIN Xingyao,ZHANG Fanchang.The elastic impedance equation based on Gray approximate and inversion[J].Oil Geophysical Prospecting,2007,42(4):435–439.
[13]孙鹏远.多属性AVO分析及弹性参数反演方法研究[M].长春:吉林大学出版社,2004:35–79.
[2]HILTERMAN F J.地震振幅解释[M].孙夕平,赵良武,译.北京:石油工业出版社,2006:51–64.
[3]陈同俊.P波方位AVO理论及煤层裂隙探测技术[M].徐州:中国矿业大学出版社,2009:16–20.
[4]GOODWAY B,CHEN T,DOWNTON J.Improved AVO fluid detection and lithology discrimination using Lamépetrophysical parameters[C]//67th Annual International SEG meeting.1997:183–186.
[5]陈建江.AVO三参数反演方法研究[D].北京:中国石油大学,2007:11–21.
[6]GRAY D,GOODWAY B,CHEN Taiwen.Bridging the gap:Using AVO to detect changes in fundamental elastic constants[C]//69th Annual Internet Expanded Abstract.1999:852–855.
[7]张玉华.基于岩石物理的AVO正演模拟研究[D].北京:中国石油大学,2007:27–43.
[8]王一兵,田广文,李五忠.中国煤层气选区评价标准探讨[J].地质通报,2006,25(9/10):1104–1107.WANG Yibing,TIAN Guangwen,LI Wuzhong.Criteria for the evaluation of coalbed methane area selection in China[J].Geological Bulletin of China,2006,25(9/10):1104–1107.
[9]王红岩,李贵中,李景明.中国煤层气的富集特征[J].中国煤层气,2006,3(2):7–10.WANG Hongyan,LI Guizhong,LI Jingming.Characteristics of CBM enrichment in China[J].China Coalbed Methane,2006,3(2):7–10.
[10]彭苏萍,高云峰.含煤地层振幅随偏移距变化正演模型研究[J].科学通报,2005,50(1):131–137.PENG Suping,GAO Yunfeng.Research of amplitude variation with offset by forward modeling[J].Chinese Science Bulletin,2005,50(1):131–137.
[11]彭苏萍,杜文凤,苑春方.不同结构类型煤体地球物理特征差异分析和纵横波联合识别与预测方法研究[J].地质学报,2008,82(10):1311–1322.PENG Suping,DU Wenfeng,YUAN Chunfang.Identification and forecasting of different structural coals by P-wave and S-wave from well-logging[J].Acta Geologica Sinica,2008,82(10):1311–1322.
[12]王保丽,印兴耀,张繁昌.基于Gray近似的弹性波阻抗方程及反演[J].石油地球物理勘探,2007,42(4):435–439.WANG Baoli,YIN Xingyao,ZHANG Fanchang.The elastic impedance equation based on Gray approximate and inversion[J].Oil Geophysical Prospecting,2007,42(4):435–439.
[13]孙鹏远.多属性AVO分析及弹性参数反演方法研究[M].长春:吉林大学出版社,2004:35–79.