地震谱衰减分析技术在乌审召天然气勘探中的应用  

Application of Seismic Frequency Spectrum Attenuation in Gas Exploration

作　　者：张永常 许建权[2] 王宝江 

机构地区：[1]东方地球物理公司长庆项目部,西安710021 [2]中国石油勘探开发研究院西北分院,兰州730020 [3]陕西延长石油(集团)研究院,西安710075

出　　处：《重庆科技学院学报（自然科学版）》2015年第1期53-56,共4页Journal of Chongqing University of Science and Technology：Natural Sciences Edition

基　　金：国家自然科学基金重点项目(40730424)

摘　　要：为了确定储层内部的流体性质及成分,运用地震衰减分析来确定地震信号谱与振幅特征的变化,分析在包含孔隙和裂隙的复杂地质条件下岩石属性特征和波的传播特征。与常规吸收衰减计算方法不同,该方法采用目标层上下开时窗分别计算上下信号谱及子波谱,从而避开了直接针对薄目的层计算谱的常规做法。分析乌审召实际地震资料可知,谱变化和衰减异常与岩石中存在的碳氢化合物有关,该地震衰减模式与高产区的关联能够帮助确定新的潜在区域和勘探目标。In order to identify the fluid contents in reservoir,seismic spectrum attenuation is applied to determine the changes of spectrums and amplitudes on seismic data,and it can be used to analysis the character of transmission for seismic data and even the attributes of rocks with porosity and fractures. Compared with conventional methods in calculating spectrum attenuation,we compute the spectrum of seismic and wavelet above and under the interest layer respectively,avoiding to obtaining those on thin layers directly. In this paper,combined with formar seismic data,we can conclude that spectrum attenuation abnormal is related to the hydro- carbon in rocks in WSZ area,and it can be used to determine potential prospecting area of interests by this relation.

关 键 词：地震信号谱 最大熵谱 衰减 天然气勘探 

分 类 号：TE132.14[石油与天然气工程—油气勘探]