零偏VSP在提取深层地层物性参数中的应用  

Application of zero bias VSP in extracting physical parameters of deep strata

作　　者：颜晓霞[1] 毛锐强 蔡存军 康智清 郑明 Yan Xiaoxia;Mao Ruiqiang;Cai Cunjun;Kang Zhiqing;Zheng Ming(Sinopec Petroleum Engineering Geophysics Co.,Ltd.,Henan Zhengzhou 450000)

机构地区：[1]中国石化石油工程地球物理有限公司,河南郑州450000 [2]中国石化海洋石油工程有限公司物探分公司,上海200120

出　　处：《石化技术》2020年第7期124-125,共2页Petrochemical Industry Technology

摘　　要：对发育有转换横波的零偏VSP资料,可以通过拾取下行纵波和横波波至时间,提取出井旁地层的物性参数,供岩性识别和含油气性预测。通常在零偏VSP原始资料中,下行转换横波在浅中层地层中偶尔有发育,但在深层地层中被各种噪声所压制而不能识别。对零偏VSP资料做偏振极化处理的基础上,进行波场分离,分离掉压制转换横波的噪声,从而加强转换横波能量,提高转换波信噪比和同相轴连续性。从零偏VSP原始Z分量拾取纵波初至,从波场分离后的下行转换波中拾取横波波至时间,可以计算出深层地层精确的物性参数。For VSP data with converted S-wave,the physical parameters of the formation near the well can be extracted by picking up the arrival time of the down going P-wave and S-wave for lithology identification and oil-gas prediction.Generally,in the zero bias VSP data,the down converted S-wave is occasionally developed in the shallow and middle strata,but it is suppressed by various noises in the deep strata and cannot be identified.On the basis of polarization polarization processing of zero bias VSP data,wave field separation is carried out to separate the noise that suppresses converted S-wave,so as to strengthen converted S-wave energy,improve converted wave signal-to-noise ratio and in-phase axis continuity.The accurate physical parameters of deep strata can be calculated by picking up the first arrival of P-wave from the original z-component of VSP and the time of S-wave from the down converted wave after wave field separation.

关 键 词：零偏VSP 极化处理 波场分离 物性参数 

分 类 号：P631.4[天文地球—地质矿产勘探]