短时傅里叶变换在火成岩储层中裂缝识别中的应用  

Short-time Fourier Transform in the Application of the Igneous Rock Reservoir in Fracture Identification

作　　者：郑武[1] 王祝文[1] 向旻[1] 周大鹏[1] 杨晓辉[1] 王文华[2] 

机构地区：[1]吉林大学地球探测与科学技术学院,吉林长春130026 [2]吉林大学地球科学学院,吉林长春130061

出　　处：《东华理工大学学报（自然科学版）》2016年第1期42-47,共6页Journal of East China University of Technology(Natural Science)

基　　金：国家973项目"辽河盆地东部凹陷火成岩分布特征与典型区解剖研究>"(2012CB822002)

摘　　要：火成岩的储层具有物性差.非均质性强的特征。因此裂缝发育程度是制约火成岩油气藏的重要因素,那么如何识别火成岩储层的裂缝就成为火成岩油气藏开发的难点。通常采用双侧向电阻率的大小和差异识别裂缝,由于电阻率还受其他因素影响,故裂缝识别的分辨率不高。以辽河油田为例,利用电阻率与裂缝之间的关系,从短时傅里叶变换的原理出发,利用时-频方法来挖掘双侧向电阻率曲线的蕴含信息识别裂缝,并将常规的测井曲线识别裂缝与该方法相结合效果更佳显著。研究表明,采用汉明窗函数并取55个采样点来求取电阻率曲线频谱及幅值效果更好,其裂缝的识别度也较高。这种时频分析方法较好地解决了火成岩识别裂缝的问题,对地区火成岩油气藏的裂缝识别有一定的借鉴意义。The volcanic rock reservoir is poor physical property and heterogeneity is strong. So the degree of fracture development is an important factor of restricting the volcanic rock reservoirs,and then it would become the difficulty of the development of volcanic rock reservoirs that how to identify the volcanic reservoir cracks. The size and difference of dual laterolog resistivity are commonly used to identify fractures. But it is also affected by other factors,so the resolution of fracture identification is not high. In Liaohe oilfield as an example,using the relationship between the resistivity and crack,starting from the principle of short-time Fourier transform,using the timefrequency dual lateral resistivity curve method to mining of implicit information to identify cracks,the effect is better that the method combined with conventional logging curve to identify cracks and that. It is shown that its effect is better with using the hamming window function and take 55 samples to calculate the resistivity curve of spectrum and amplitude,and the fracture identification degree also is higher. The time-frequency analysis method is better solved the problem of the volcanic rock identification of fracture,and volcanic rock reservoirs has a certain reference significance in other areas of fracture identification.

关 键 词：火成岩油气藏 双侧向电阻率 短时傅里叶变换 裂缝识别 

分 类 号：P631.81[天文地球—地质矿产勘探]