塔河油田近地表微测井记录中低频段研究  

THE STUDY OF THE LOW-FREQUENCY SECTION IN THE NEAR-SURFACE MICRO-LOGGING RECORD OF THE TAHE OILFIELD

作　　者：宋智强[1] 刘斌[1] 陈吴金[1] 张丽娜[1] 

机构地区：[1]中国石化地球物理公司胜利分公司,山东东营257100

出　　处：《物探与化探》2014年第1期46-50,共5页Geophysical and Geochemical Exploration

摘　　要：在塔河油田近地表微测井数据中普遍存在一段频率低、能量强、波形胖的低频段记录,一般出现在高速层顶界附近。那么,这一特殊的低频段是如何产生的,对激发井深的选择又会产生什么样的影响,是该地区地震采集时不得不面临的重要问题。以往认为该低频段是由岩性变化引起,并且在井深设计方面是选择避开低频段。笔者通过实际资料、理论分析、井深试验的结果分析,认为该低频段是由虚反射引起,在低频段中激发并不改变单炮质量;并对低频段的表现特征、产生机理及对激发井深选择的影响进行了详细的分析,在激发井深设计中可以不考虑低频段的影响。There generally exists the record of a low-frequency band characterized by low frequency,strong energy and fat wave form in the near-surface micro-logging data of the Tahe oilfield,which usually occurs near the top of the high-velocity layer. The reason for the formation of this special low-frequency band and its influence on the selection of IP well depth are important problems that geologists have to face in seismic data acquisition in this area. The low-frequency band was previously considered to be produced by lithological change,and hence in well depth design,the low-frequency band was intentionally avoided.Based on practical data,theroretical analysis and well depth test,the authors hold that the low-frequency band results from ghosting,and that the IP in the low-frequency band will not change the single gun quality.The characteristics and the formation mechanism of the low-frequency band as well as its impact on the selection of IP well depth are analyzed in detail,and it is considered that the influence of the low-frequency band can be ignored in the IP well depth design.

关 键 词：低频段 激发井深 微测井 正演模拟 频谱 塔河油田 

分 类 号：P631.4[天文地球—地质矿产勘探]