如何提高测井曲线解释断层的可靠性  

How to Improve Reliability of Logging Trace Fault Interpretation

作　　者：刘栋梁 

机构地区：[1]云南省煤田地质局143队,云南曲靖655000

出　　处：《中国煤炭地质》2009年第2期56-58,74,共4页Coal Geology of China

摘　　要：断层在地质剖面上的表现是使地层厚度和层间距发生变化,通常情况下受正断层的影响会使地层缺失,从而导致地层的层间距(或厚度)减小;而受逆断层的影响则会造成地层重复,使层间距(或厚度)变大。因此通过研究相邻钻孔之间测井曲线在横向和纵向的形态变化规律,根据标志层的缺失与重复进而对断层位置、性质、断距大小作出准确判断。而确定断层存在的关键是要找准标志层,标志层的准确性代表了成果的可靠性。实例表明,利用常规测井曲线如视电阻率、散射伽马伽马和自然伽马曲线在煤、岩层对比中的响应规律,可识别出反映局部地段地层的沉积规律及特征,并依据其特殊标志准确的划定断层性质。The representation of fault on geological section is changes of strata thickness and interval between strata, generally, the normal fault causes stratigraphic hiatus, it follows reduction of interval between strata （or thickness）; while the reverse fault causes strata repeated emergence, increase of interval between strata （or thickness）. Thus, through study of transverse and longitudinal configuration changing pattern of logging traces between boreholes, marker bed hiatus or recurrent can judge fault position, nature, displacement size correctly. In turn, the key to determine existence of fault is to find marker bed （s） exactly, while accuracy of marker bed can represent reliability of results. Practices has demonstrate that, conventional logging traces such as apparent resistivity, scattered gamma-gamma and natural gamma traces response patterns can help to find out strata depositional rules and characteristics in partial sections, and based on special markers to determine fault nature correctly.

关 键 词：测井 视电阻率 散射伽马伽马 自然伽马 断层 

分 类 号：P631.8[天文地球—地质矿产勘探]