摘要
受煤层强反射同相轴的影响,煤层之下的薄砂岩预测难度大,常规的子波分解技术难以分解出稳定的子波集,即便是分解出的子波集也没有明确的地质意义。文中基于地震波形指示反演,利用地震波形相似性作为指示因子,驱动宽频测井曲线模拟,实现高分辨率薄层反演。首先利用奇异值分解实现地震波形动态聚类分析,建立地震波形与测井曲线结构特征的样本集;然后在小波域确定样本曲线中的共性结构作为初始模型;最后在贝叶斯框架约束下,根据实际地震波形修正初始模型得到高分辨率的反演成果。通过正演模型和准噶尔盆地侏罗系实例研究认为,波形指示反演克服了地震垂向分辨率的限制,能够较好地预测受煤层强屏蔽影响的薄砂岩。波形指示反演为准噶尔盆地、鄂尔多斯盆地和吐哈盆地等侏罗系受煤层屏蔽影响的薄砂岩预测提供了一种全新的思路,具有广泛的应用领域和重要的现实意义。
It is difficult to predict the thin sand beneath the coal seam because of the influence of the strong shield.It is difficult for con?ventional wavelet decomposition techniques to decompose stable wavelet sets,and even the decomposed wavelet sets have no definite ge?ological significance.In this paper,a new seismic meme inversion is proposed,which uses the similarity of seismic waveforms as an indi?cator factor to drive broadband logging curve simulation and realize high resolution inversion.Firstly,the dynamic clustering analysis of seismic waveform is realized by singular value decomposition,and the sample set of seismic waveform and well curve characteristics is established.Then the common structure in the sample is determined as the initial model in the wavelet domain,and the inversion results with high resolution are obtained by modifying the initial model according to the inversion of the actual seismic waveform structure under the constraint of the Bayesian framework.Through forward modeling and Jurassic case study in Junggar Basin,it is concluded that seis?mic meme inversion overcomes the limitation of seismic vertical resolution and can better predict thin sand affected by strong shield.Seismic meme inversion provides a new way for predicting thin sand affected by coal shield in Jurassic in Junggar Basin,Ordos Basin and Turpan?Hami Basin.It has a wide range of applications and important practical significance.
作者
陈彦虎
陈佳
CHEN Yan-Hu;CHEN Jia(School of Earth Science and Resource,China University of Geosciences(Beijing),Beijing 100083,China;PEGETE Group Inc,Beijing 100101,Chi?na;Cores and Samples Center of Natural Resources,Langfang 065201,China)
出处
《物探与化探》
CAS
北大核心
2019年第6期1254-1261,共8页
Geophysical and Geochemical Exploration
基金
国家自然科学基金项目(41572134)
关键词
波形指示反演
煤层屏蔽
薄砂岩预测
相控反演
贝叶斯原理
seismic meme inversion
coal shield
thin sand prediction
phase-control inversion
Bayes theory
