含煤地层岩浆岩侵入体地震波场模拟  

Seismic wave simulation of magmatic rock intrusion in coal bearing strata

作　　者：李江 LI Jiang(Xi'an Research Institute of China Coal Technology and Engineering Group,Xi'an 710077,China)

机构地区：[1]中煤科工集团西安研究院有限公司,西安710077

出　　处：《地球物理学进展》2021年第2期746-752,共7页Progress in Geophysics

基　　金：国家自然科学基金项目(41874123)资助.

摘　　要：从地质特征出发分析了岩浆岩侵入对煤层的影响,在此基础上建立岩浆岩侵入模型进行地震叠前波场正演与成像处理,对岩浆岩侵入体不同厚度、岩浆岩对煤层不同的侵蚀程度、不同间距等多种模型进行地震正演模拟,分析了几种情况下的地震反射波特征及岩浆岩侵入对煤层反射波的影响.研究结果表明,岩浆岩侵蚀区地震波场复杂,高精度的成像结果是正确识别岩浆岩反射波特征的基础.岩浆岩侵入体在地震剖面上一般形成能量较强的反射波,岩浆岩完全侵蚀煤层之后,引起了煤层反射波同相轴中断与相位反转.当岩浆岩侵入体与煤层间距小于40 m时,岩浆岩侵入煤层上部与下部对煤层反射波影响差异较大.通过地震波场模拟了解了岩浆岩侵入区的地震波场特征,为矿井岩浆岩侵入区地震资料处理和反射波识别提供参考.The influence of magmatic intrusion on coal seam was analyzed from the geological characteristics,and magmatic geological model was established for seismic wave field simulation and imaging processing.Seismic modeling were carried out and the characteristics of reflection wave were analyzed on various models,such as different thickness of magmatic intrusion,different erosion degree of magmatic rock to coal seam and different spaces between magmatic rock and coal seam.The results showed that seismic wave in the intrusion area of magmatic rock is complex,therefore the high precision imaging results is the basis for correctly identifying the characteristics of magmatic rock reflected wave.The magmatic intrusions generally formed strong reflection waves,after the magmatic rocks completely erode the coal seam the normal reflection wave is interrupted and phase is reversed.It is also conclude that the seismic reflection characteristics of magmatic and its influence on the reflection wave of coal seam are different when the spaces between magmatic rock and coal is less than 40 m.Finally,the seismic wave field characteristics of magmatic intrusion area was recognized by seismic wave field simulation,which provides reference for seismic data processing and reflection wave identification in mine magmatic intrusion area.

关 键 词：岩浆岩 煤层 地震勘探 数值模拟 

分 类 号：P631[天文地球—地质矿产勘探]