利用零偏VSP数据求取横波速度——以七北101井VSP测井为例
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摘要
从七北101井零偏VSP记录中的一组强波出发,通过对零偏与非零偏VSP原始波场中直达纵波和下行转换波第一波至时间的分析,证明其一为纵波震源所激发的纵波在地表某个强阻抗差界面上产生的转换横波。由于这种波具有纯横波的运动学特点,我们可以用于计算横波的速度。利用直达波初至进行三分量矢量定位,在横向垂直分量上得到了信噪比较高的直达横波,选取振幅较强的同相轴提取初至时间,进一步求取了横波速度及泊松比。
The arrival time of the compressional waves and downward converted waves in zero and nonzero-offset VSP wave fields were analyzed based on a group of strong wave in zero VSP logs in Qibei 101. The result showed that one of them was converted S wave, converted from the compressional wave generated from compressional wave source, generated on a strong impedance surface. The S wave velocity is calculated by the converted waves as it is of kinematics feature of pure S wave. The three component vectors were adjusted by the arrival of direct wave, the direct S wave, which were high S/N ratio, were obtained and the arrival time were picked up from strong amplitude events. The velocities of shear waves and poisson ratio were calculated.
The arrival time of the compressional waves and downward converted waves in zero and nonzero-offset VSP wave fields were analyzed based on a group of strong wave in zero VSP logs in Qibei 101. The result showed that one of them was converted S wave, converted from the compressional wave generated from compressional wave source, generated on a strong impedance surface. The S wave velocity is calculated by the converted waves as it is of kinematics feature of pure S wave. The three component vectors were adjusted by the arrival of direct wave, the direct S wave, which were high S/N ratio, were obtained and the arrival time were picked up from strong amplitude events. The velocities of shear waves and poisson ratio were calculated.
引文
[1]吕功训.利用VSP资料中P-SV转换波求取横波速度.地球物理技术汇编,1991,15:150￣164
[2]朱光明.垂直地震剖面方法.北京:石油工业出版社,1988:143
[3]徐仲达,郝晓红等.用VSP数据中下行P-SV转换横波求取横波速度.石油物探,2002,41(3):274￣278
[4]于世焕,宋玉龙,刘美丽等.句容地区VSP转换波的研究.石油物探,2001,40(1):56￣63
[5]刘荣,李淑宁.VSP纵、横波联合解释及应用.石油物探,2000,39(4):95￣99
[6]郅东彪.非零井源距VSP三分量记录的处理.石油物探,1990,29(4):27￣32
[7]严又生等.非零井源矩VSP资料在煤层气勘探中的应用研究.煤田地质与勘探,2002,30(2):54￣57
[8]王广北,薛亚琴,王浩.西部新区VSP层位标定问题研究.石油物探,2005,44(增刊):46￣49
[9]张卫红,徐亦鸣,刘丽.VSP转换波成像技术及实例分析.石油物探,2003,42(1):42￣48
[2]朱光明.垂直地震剖面方法.北京:石油工业出版社,1988:143
[3]徐仲达,郝晓红等.用VSP数据中下行P-SV转换横波求取横波速度.石油物探,2002,41(3):274￣278
[4]于世焕,宋玉龙,刘美丽等.句容地区VSP转换波的研究.石油物探,2001,40(1):56￣63
[5]刘荣,李淑宁.VSP纵、横波联合解释及应用.石油物探,2000,39(4):95￣99
[6]郅东彪.非零井源距VSP三分量记录的处理.石油物探,1990,29(4):27￣32
[7]严又生等.非零井源矩VSP资料在煤层气勘探中的应用研究.煤田地质与勘探,2002,30(2):54￣57
[8]王广北,薛亚琴,王浩.西部新区VSP层位标定问题研究.石油物探,2005,44(增刊):46￣49
[9]张卫红,徐亦鸣,刘丽.VSP转换波成像技术及实例分析.石油物探,2003,42(1):42￣48
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