岩浆岩地震波阻抗反演与厚度预测

doi:10.11720/wtyht.2020.1457

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摘要

岩浆岩的侵入对煤层有较大的破坏作用,严重影响煤矿的安全开采。高密度三维地震数据具有宽频带、宽方位和高密度采样的优势,包含着更丰富的构造和岩性信息,为岩浆岩的识别和预测奠定了基础。通过测井曲线综合对比分析,常规声波、密度等测井曲线对岩浆岩敏感性较差,无法识别和准确划分岩浆岩,电阻率和自然伽马等测井对岩浆岩反映敏感,可用于岩浆岩层位划分;以敏感曲线的层位划分结果为约束,对声波和密度曲线进行重构,获得对岩浆岩反映敏感的伪测井曲线,基于模型进行波阻抗反演,将地震信息转化为岩性信息,精细雕刻岩浆岩的空间展布规律,实现岩浆岩侵蚀范围和厚度预测。

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	李江
	智敏
	朱书阶

关键词 ：岩浆岩, 煤田, 地震勘探, 测井曲线, 反演

Abstract：

The erosion of magmatic rock has a great destructive effect on coal seam and seriously affects the safety of coal mining.High-density three-dimensional seismic data have the advantages of wide band,wide azimuth and high-density sampling,and contains abundant structural and lithological information,which lays a foundation for the identification and prediction of magmatic rocks.A comprehensive comparison of logging curves shows that conventional logging curves has many shortcomings,for example,acoustic wave and density are less sensitive to magmatic rocks,and it is impossible for them to identify and accurately classify magmatic rocks.Logs such as resistivity and natural gamma are sensitive to magmatic rocks,and can be used to classify magmatic strata.The acoustic wave and density curves are reconstructed based on the horizon division results of the sensitive curve,and then curves sensitive to magmatic rocks are obtained.Based on the seismic impedance inversion,the seismic information is transformed into lithological information,so the existing of magmatic rocks is clear and the erosion range and thickness can be predicted.

Key words： magmatic rocks coalfield seismic prospecting logging seismic inversion

收稿日期: 2019-07-23 出版日期: 2020-10-26

P631.4

基金资助:中煤科工集团西安研究院有限公司科技创新基金项目“岩浆岩地震识别与预测技术研究——以淮北矿区为例”(2019XAYQN03)

作者简介: 李江(1985-),男,博士,主要从事地震勘探数据处理和解释的研究工作。Email: 2739594195@qq.com

引用本文:

李江, 智敏, 朱书阶. 岩浆岩地震波阻抗反演与厚度预测[J]. 物探与化探, 2020, 44(5): 1233-1238.
LI Jiang, ZHI Min, ZHU Shu-Jie. The fictitious P-impedance inversion and thickness prediction of magmatic rock. Geophysical and Geochemical Exploration, 2020, 44(5): 1233-1238.

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https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2020.1457 或 https://www.wutanyuhuatan.com/CN/Y2020/V44/I5/1233

Fig.1 岩浆岩在地震剖面上的特征
a—常规三维地震勘探;b—高密度三维地震勘探

Fig.2 研究区岩浆岩测井曲线特征

Fig.3 真实测井曲线与伪测井曲线及其波阻抗对比
a—原始声波时差曲线;b—原始密度曲线;c—重构伪声波(红色)和密度曲线(绿色);d—原始波阻抗(黑色)与伪曲线计算的波阻抗(红色)

Fig.4 过井地震剖面及反演效果
a—过井地震剖面;b—原始测井曲线反演剖面;c—伪测井曲线反演剖面

Fig.5 岩浆岩厚度预测平面分布

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