摘要
受地层的吸收衰减作用影响,地震子波在地下传播时会发生振幅衰减、相位畸变,导致地震数据的分辨率降低,导致地层尖灭难以通过地震剖面反射特征准确识别。为解决地震剖面上尖灭点位置识别不准确的问题,利用同步挤压广义S变换高时频分辨率与聚焦性的优势,研究从时频域进行尖灭点识别的可能性,提高尖灭点的识别精度。通过模型试验发现:地层尖灭会在单频剖面中形成亮点,通过提取不同的单频剖面发现,高频分量可以更准确识别尖灭点的位置,验证了方法的有效性。将该方法应用到实际资料砂体尖灭点识别中,提取地震数据高频剖面,有效提高了尖灭点的识别精度。
Effected by the absorption and attenuation of the stratum,the amplitude attenuation and phase distortion of the seismic wavelet in the underground propagation will occur,which would lead to the decrease of the resolution of the seismic data,and it is difficult to accurately identify the stratum pinch out by the reflection characteristics of the seismic profile.In order to solve the problem of pinch out inaccurate recognition on seismic profiles,we use the advantages of high time-frequency resolution and focus of synchrosqueezing generalized S-transform to study the possibility of pinch out recognition from the time-frequency domain,and improve the accuracy of pinch out recognition.After model test,it is found that the formation pinch-out will form bright spot in the single-frequency profile.By extracting different single-frequency profiles,the high-frequency components can more accurately identify the location of the pinch out,which verifies the effectiveness of the method.In the application of pinch out recognition of sand body in actual data,the high frequency profile of seismic data is extracted.This method also has high time-frequency resolution,which improves the recognition effect of pinch out.
作者
刘艺林
周怀来
廖璐瑶
王元君
陈罗元
巫南克
LIU Yilin;ZHOU Huailai;LIAO Luyao;WANG Yuanjun;CHEN Luoyuan;WU Nanke(Chengdu University of Technology Geophysical Institute,Chengdu 610059,China;Chengdu University of Technology State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu 610059,China;Chengdu University of Technology Key Laboratory of Earth Exploration and Information Technology of Ministry of Education,Chengdu 610059,China)
出处
《物探化探计算技术》
CAS
2021年第5期554-562,共9页
Computing Techniques For Geophysical and Geochemical Exploration
基金
十三五国家重大专项(2016ZX05026-001-005)。
关键词
尖灭点识别
时频分析
同步挤压广义S变换
pinch-out recognition
time-frequency analysis
synchrosqueezing generalized S transform
