高密度三维地震数据驱动的煤层岩浆岩侵入区综合解释方法与应用

High density 3D seismic data-driven comprehensive interpretation method of magmatic intrusion zones in coal seams and its application

淮北矿区主采煤层多存在岩浆岩侵入现象,且具有侵入煤层多、分布面积广、侵入方式复杂等特点,常规地震勘探无法保证其解释精度。针对该问题,以全数字高密度三维地震勘探数据体为基础,对比分析不同岩浆岩侵入状态的地震响应特征;综合利用基于地层物性差异的地震多属性分析技术、基于波形差异的地震相分析技术和基于阻抗差异的测井约束波阻抗反演技术,进行煤层岩浆岩侵入区的识别与解释,精细雕刻其空间分布规律。研究表明:薄层岩浆岩侵入区以测井约束的波阻抗反演解释精度高,厚层岩浆岩侵入区预测则综合地震属性分析与地震相分析结果。因此,根据矿区的煤层分布和岩浆岩侵入特征,综合运用地震属性技术、地震相技术与波阻抗反演技术,能有效刻画出岩浆岩侵入煤层的分布范围。

Magmatic rock intrusion is present in most of the main coal seams in Huaibei mining area,is characterized by multi-layer intrusion,wide spatial distribution and complex intrusion modes,etc.Conventional seismic exploration can't guarantee the interpretation accuracy.Focused on the problem,the seismic response characteristics of different magmatic intrusive modes are compared and analyzed based on the high density 3D seismic exploration.The seismic multi-attributes analysis technology based on rock physical property difference,the seismic facies analysis technology based on waveform difference and the log constrained impedance inversion technology based on impedance difference are comprehensively utilized to identify and interpret the magmatic intrusive area,and the spatial distribution are carved in detail.The results show that the log constrained impedance inversion has high precision in thin layered magmatic intrusive area,and the prediction of thick layered magmatic intrusive area can rely on seismic attribute analysis and seismic facie analysis.Therefore,according to the coal seam distribution and the characteristics of intrusive magmatic rock,the seismic attribute technology,seismic facies technology and seismic impedance inversion technology can be used comprehensively to effectively depict the distribution of magmatic rock in coal seam.