利用VSP资料分析地层衰减特性  

ANALYSIS ON FORMATION ATTENUATION CHARACTER BY VSP DATA

作　　者：曹立斌[1] 梁波[1] 欧阳明华[1] 巫芙蓉[1] 程莉莉[2] 

机构地区：[1]中国石油天然气集团公司川庆钻探工程公司地球物理勘探公司,610213 [2]成都理工大学研究生院

出　　处：《天然气工业》2008年第5期41-43,140-141,共3页Natural Gas Industry

摘　　要：地层的衰减特性与岩石类型、流体类型和流体饱和度有关,应用地震数据和VSP数据并加以校正和补偿后,可研究地层的衰减特性。首先根据VSP各测点初至的振幅、初至的频谱以及初至的子波随深度的变化情况定性分析各地层的衰减特性,随后利用频谱比法求得了地层的品质因子并用于定量分析地层的衰减特性,最后将品质因子值资料和测井资料结合起来对储层进行描述和分析。经对BQ205井的地层衰减特性进行研究,认为利用各测点初至振幅、初至频谱以及初至子波的变化可以对各地层的衰减特性进行定性分析,能够初步确定出地层的衰减规律;品质因子曲线结合测井曲线能较好地对地层的衰减规律进行定量描述,并能确定储层的范围,但不能准确地划分出薄储层的顶、底界。Since formation attenuation character is related to rock type, fluid type and fluid saturation, it can be studied after correcting and compensating seismic data and VSP data. First, the formation attenuation character is analyzed qualitatively after watching how the primary amplitude, primary frequency spectrum and primary wavelet for each VSP measuring point change by the depth; then, quality factor of formation is figured out by spectral ratio method and used to analyze formation attenuation character quantitatively; last, reservoir is described and analyzed through combination of quality factor materials and logging data. After study on formation attenuation character of the well BQ205, it is regarded that the change of primary amplitude, primary frequency spectrum and primary wavelet for each measuring point can analyze each formation attenuation character qualitatively and confirm the rule of formation attenuation initially; quality factor curve combined with logging curve can give a better quantitative description on the rule of formation attenuation, confirm reservoir bound but cannot give a correct classification on bottom bound and top bound of thin reservoir.

关 键 词：垂直地震剖面法 地层 衰减 振幅 频谱 

分 类 号：P631.4[天文地球—地质矿产勘探]