测井曲线小波变换特性在层序地层划分中的应用  

Application of Wavelet Inversion Characteristics of Logging Curve in the Classification of Sequence Stratigraphy

作　　者：李霞[1] 范宜仁[1,2] 杨立伟[3] 房文静[1] 

机构地区：[1]中国石油大学,山东东营257061 [2]大港油田博士后工作站,天津300280 [3]大庆油田有限责任公司地质录井分公司,黑龙江大庆163411

出　　处：《大庆石油地质与开发》2006年第4期112-115,共4页Petroleum Geology & Oilfield Development in Daqing

摘　　要：测井曲线包含了丰富的地质信息,对研究地层多级别旋回性及识别地层信息多分辨突变具有优势。测井信号的时频分析将一维测井信号拓展为二维时频域,从而使地层内部的旋回性结构得以清晰展示。对测井曲线进行连续小波变换,将测井信号与深度的关系转换为与深度和尺度域的变化关系,通过研究多种伸缩尺度下小波系数曲线表现出的周期性振荡特征,可与各级层序界面建立一定的对应关系。以胜坨油田某井为例,运用小波变换的多尺度特性探测到地层序列中不同尺度的层序界面,与传统方法所划分的界面基本一致。这些探索为地层层序的划分提供了一种新的思路和有效途径。Logging curve containing abundant geology information has the advantage not only for study of stratigraphic multi stage cycling but also for identification of stratigraphic multi resolution abrupt change.Time-frequency analysis of logging signal can expand time-frequency field of logging signal from 1D into 2D,making stratum cycling structure much clearer.Continuous wavelet inversion of logging curve is performed and relation of logging signal and depth is conversed into relation of depth and scale field.Based on periodic oscillating feature of microwave coefficient curve in multi expansion sales,certain corresponding relations can be built with each sequent interface.Taking one well in Shengtuo Oilfield as the example,sequent interfaces in stratigraphic sequence with different scales can be detected using multi scale features of wavelet inversion,which accord with that of conventional method.The research above mentioned has provided a new idea and an efficient approach for classification of serigraphic sequence.

关 键 词：测井曲线 小波变换 层序地层 层序界面 

分 类 号：P631.81[天文地球—地质矿产勘探]