小面元三维地震勘探技术在西山屯兰矿南五采区的应用
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摘要
屯兰矿南五采区地形复杂,最大高差达271m,地表大面积为第四系黄土覆盖,激发困难。为探索研究小面元三维地震勘探技术的应用效果,在常规三维地震勘区域内划出1km2,采用5m×5m小面元进行采集。在地震数据采集过程中,采取了加大激发井深、提高覆盖次数、减小CMP面元网格和加大接收排列等技术措施,做到"四小三高、二中一深、两个等高面"。通过插值、抽线及扩大面元处理,获得2.5m×2.5m×1ms、5m×5m×1ms、5m×10m×1ms、10m×10m×1ms以及不同叠加次数的三维数据体。资料解释工作主要是在5m×5m×1ms、2.5m×2.5m×1ms两个数据体上进行,解释落差大于或等于5m的断层6条,落差3～5m的断层8条;查明长轴直径20～30m的陷落柱4个,30～100m的陷落柱1个,大于100m的陷落柱3个。与相邻区常规三维地震比较,小面元三维地震勘探有利于对小陷落柱、小断层的控制和解释。
The S5 winning district of Tunlan coalmine has complicated surface relief;maximum height difference could be 271m as high.Quaternary loess has covered in a great measure,thus a difficult shot condition.To probe into the applicable effect of small surface element 3D seismic prospecting technology,an 1 km2 area has lined out to carry out 5m×5m small surface element acquisition.Technical measures of to increase shothole depth and fold,reduce CMP surface element grid and increase receiving array have adopted,and lived up to "4 smaller 3 higher,2 medium 1 deep and 2 contour planes".After interpolating,line extracting and surface element enlarging,obtained 2.5m×2.5m×1ms,5m×5m×1ms,5m×10m×1ms,10m×10m×1ms and different stacking fold 3D data volumes.Data interpretation is mainly carried on 5m×5m×1ms and 2.5m×2.5m×1ms data volumes,interpreted 6 faults with throw ≧5m,8 faults with throw 3-5m;4 subsided columns with major axis diameter 20～30m,1 subsided column with major axis 30～100m and 3 >100m.Compared with neighboring area conventional 3D seismic,the small surface element 3D seismic is in favor of small sized subsided column and minor fault interpretation.
The S5 winning district of Tunlan coalmine has complicated surface relief;maximum height difference could be 271m as high.Quaternary loess has covered in a great measure,thus a difficult shot condition.To probe into the applicable effect of small surface element 3D seismic prospecting technology,an 1 km2 area has lined out to carry out 5m×5m small surface element acquisition.Technical measures of to increase shothole depth and fold,reduce CMP surface element grid and increase receiving array have adopted,and lived up to "4 smaller 3 higher,2 medium 1 deep and 2 contour planes".After interpolating,line extracting and surface element enlarging,obtained 2.5m×2.5m×1ms,5m×5m×1ms,5m×10m×1ms,10m×10m×1ms and different stacking fold 3D data volumes.Data interpretation is mainly carried on 5m×5m×1ms and 2.5m×2.5m×1ms data volumes,interpreted 6 faults with throw ≧5m,8 faults with throw 3-5m;4 subsided columns with major axis diameter 20～30m,1 subsided column with major axis 30～100m and 3 >100m.Compared with neighboring area conventional 3D seismic,the small surface element 3D seismic is in favor of small sized subsided column and minor fault interpretation.
引文
[1]宋长愿,段建华,费明泽,等.小面元采集三维地震勘探技术应用初探[J].中国煤田地质,2007,19(S2).
[2]宋长愿,等.山西焦煤集团西山煤电股份有限公司屯兰矿南五采区精细三维地震勘探报告[R].河北邯郸:中国煤炭地质总局水文物测队,2007.
[2]宋长愿,等.山西焦煤集团西山煤电股份有限公司屯兰矿南五采区精细三维地震勘探报告[R].河北邯郸:中国煤炭地质总局水文物测队,2007.
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