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物探与化探  2019, Vol. 43 Issue (6): 1254-1261    DOI: 10.11720/wtyht.2019.1325
  地质调查·资源勘查 本期目录 | 过刊浏览 | 高级检索 |
波形指示反演在煤层屏蔽薄砂岩分布预测中的应用
陈彦虎1,2, 陈佳3
1. 中国地质大学(北京) 地球科学与资源学院,北京 100083
2. 北京中恒利华石油技术研究所,北京 100101
3. 自然资源实物地质资料中心,河北 廊坊 065201
The application of seismic meme inversion to thin sand distribution prediction under coal shield
Yan-Hu CHEN1,2, Jia CHEN3
1. School of Earth Science and Resource,China University of Geosciences (Beijing),Beijing 100083,China
2. PEGETE Group Inc,Beijing 100101,China
3. Cores and Samples Center of Natural Resources,Langfang 065201,China
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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。

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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    
Abstract

It is difficult to predict the thin sand beneath the coal seam because of the influence of the strong shield.It is difficult for conventional wavelet decomposition techniques to decompose stable wavelet sets,and even the decomposed wavelet sets have no definite geological significance.In this paper,a new seismic meme inversion is proposed,which uses the similarity of seismic waveforms as an indicator 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 seismic 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.

Key wordsseismic meme inversion    coal shield    thin sand prediction    phase-control inversion    Bayes theory
收稿日期: 2018-11-20      出版日期: 2019-11-28
:  P631.4  
基金资助:国家自然科学基金项目(41572134)
作者简介: 陈彦虎(1982-),男,高级工程师,现为中国地质大学(北京)矿产普查与勘探专业在读博士,从事储层预测、非常规储层研究工作。Email:yhchen08@qq.com
引用本文:   
陈彦虎, 陈佳. 波形指示反演在煤层屏蔽薄砂岩分布预测中的应用[J]. 物探与化探, 2019, 43(6): 1254-1261.
Yan-Hu CHEN, Jia CHEN. The application of seismic meme inversion to thin sand distribution prediction under coal shield. Geophysical and Geochemical Exploration, 2019, 43(6): 1254-1261.
链接本文:  
https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2019.1325      或      https://www.wutanyuhuatan.com/CN/Y2019/V43/I6/1254
Fig.1  地震波形指示反演示意
a—依据地震波形优选样本;b—确定样本集共性特征
Fig.2  地质模型与不同反演结果对比
a—地质模型;b—合成地震道;c—稀疏脉冲反演结果;d—波形指示反演结果
Fig.3  加随机噪声正演地震道与波形指示反演结果
a—加10%随机噪声合成地震道;b—加20%随机噪声合成地震道;c—加10%随机噪声波形指示反演结果;d—加20%随机噪声波形指示反演结果
Fig.4  A、B井纵波阻抗曲线和地震道
Fig.5  岩性直方图
Fig.6  A井~E井连井砂体对比特征
Fig.7  A井~E井连井地震特征和反演效果分析
a—地震剖面;b—稀疏脉冲反演剖面;c—波形指示反演剖面
Fig.8  反演砂体厚度
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