三分量VSP资料在裂缝检测中的应用  

Application of three-component VSP data in fracture detection.

作　　者：曹立斌 李亚林 梁波 吴战培 程莉莉[2] 杨冬梅 

机构地区：[1]中国石油四川石油地球物理勘探公司,四川成都610213 [2]成都理工大学研究生院,四川成都610059

出　　处：《石油物探》2008年第1期67-71,17,共5页Geophysical Prospecting For Petroleum

摘　　要：介绍了利用纵波震源零井源距三分量VSP资料的下行横波信息对井旁裂缝进行检测的原理和实现方法。首先采用能量最大法对水平分量检波器重新定位,获得P-SV波和SH波剖面;然后采用中值滤波法将下行横波从P-SV波和SH波剖面中分离出来,并拾取下行P-SV和SH波初至,进行下行横波拉平处理,得到下行横波拉平剖面;最后在下行横波拉平剖面上取一段时窗进行快、慢横波分裂,并进行分析,确定裂缝的发育方位和裂缝密度(以快、慢横波时差表示)。实际资料处理表明,采用上述方法可以有效地确定地层裂缝的主体方位和密度,结合测井资料可以对储层进行综合分析和描述。Theories and method of fracture detection by down going S- wave information from zero offset three-component VSP data were introduced.Firstly.the horizontal component geophone was re[o- eared by using the maximum energy method to obtain the P SV and P SH wave sections.Then the median filtering was used to extract the down-going S-wave from P-SV and P SH wave sections and to pick the first break of down-going P SV and P-SH wave.After that,the down-going S-wave was leveled to get leveling sections. Finally,the time window was selected from the down-going S-wave leveling sections to carry on fast and slow S-wave splitting;and then.the result was analyzed to determine the azimuth and density of fractures developed(expressed by moveout of fast and slow S- wave).Actual application shows that the method can effectively i dentify the main azimuth and density of formation factures and can make comprehensive analysis and description on reservoirs with logging data.

关 键 词：三分量VSP资料 纵波震源 横波分裂 裂缝方位 裂缝密度 

分 类 号：P631.4[天文地球—地质矿产勘探]