葛店矿双庙扩大区三维地震勘探
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摘要
葛店煤矿双庙扩大区位于豫、皖两省交界处。勘探区为一轴向北北东向的不对称向斜构造,地层倾角26°～30,°测区深部有岩浆岩侵入体,严重影响煤层赋存形态;地表条件复杂,村庄密集、河流较多,测区东侧塌陷区水塘大面积分布,三维地震勘探野外施工难度大。本区地震勘探观测系统设计为12线18炮制,为避免偏移归位及叠加次数降低等问题,在向斜轴部两侧、村子周边及河岸处适当加密炮点,并在塌陷区利用钢钎插置检波器以保证CDP点完整性。数据处理采取了叠前反褶积、叠前时间偏移等技术,数据处理效果显著。遵循多波组对比、多个数据体综合解释的原则,以纵向、横向和任意时间剖面相结合,充分利用三维可视化技术进行地震资料解释。本次勘探成果查明了主采煤层三22、二2煤层的构造形态及埋藏深度;解释落差5m以上断层34条,其中修改原有断层5条;另外新发现小于5m的异常断点22个。经巷道验证煤层底板标高误差0.43%～1.96%,巷道已揭露断层7条,与解释成果基本一致。
The Gedian coalmine Shuangmiao extending area is situated on the boundary between Henan and Anhui provinces.The prospecting area is a NNE axial direction asymmetrical syncline,strata dip angle 26°~30°,deep part has igneous rock intrusive seriously impact coal seam hosting configurations.Surface condition is complex,densely covered by villages,numerous rivers,and in eastern part of the prospecting area distributed large area water ponds formed by subsidence,so it is very difficult to carry out 3D seismic field works.Seismic prospecting field setup in the area is 12 lines 18 shots designed,to avoid migration,homing and stacking fold falling,properly thickening shotpoints on both sides of syncline axis,village peripheral and river banks,and using steel chisel sticking in geophones in subsided area to ensure integrity of CDP points.Data processing has used prestack deconvolution,prestack time migration techniques to make good results.Comply with multiple wave groups' contrast,multiple data cubes comprehensive interpretation principle combined longitudinal with horizontal and random time sections,to take full advantages of 3D visual technique carry out seismic data interpretation.The prospecting has found out structural configuration and burying depth of main mineable coal seams Nos.III22 and II2;interpreted 34 faults with throws larger than 5m,among them,5 original faults revised,besides,22 fault points with throws less than 5m have newly found.After roadway verified coal seam floor elevation error is 0.43%~1.96%,revealed 7 faults,basically coincided with interpreted results.
The Gedian coalmine Shuangmiao extending area is situated on the boundary between Henan and Anhui provinces.The prospecting area is a NNE axial direction asymmetrical syncline,strata dip angle 26°~30°,deep part has igneous rock intrusive seriously impact coal seam hosting configurations.Surface condition is complex,densely covered by villages,numerous rivers,and in eastern part of the prospecting area distributed large area water ponds formed by subsidence,so it is very difficult to carry out 3D seismic field works.Seismic prospecting field setup in the area is 12 lines 18 shots designed,to avoid migration,homing and stacking fold falling,properly thickening shotpoints on both sides of syncline axis,village peripheral and river banks,and using steel chisel sticking in geophones in subsided area to ensure integrity of CDP points.Data processing has used prestack deconvolution,prestack time migration techniques to make good results.Comply with multiple wave groups' contrast,multiple data cubes comprehensive interpretation principle combined longitudinal with horizontal and random time sections,to take full advantages of 3D visual technique carry out seismic data interpretation.The prospecting has found out structural configuration and burying depth of main mineable coal seams Nos.III22 and II2;interpreted 34 faults with throws larger than 5m,among them,5 original faults revised,besides,22 fault points with throws less than 5m have newly found.After roadway verified coal seam floor elevation error is 0.43%~1.96%,revealed 7 faults,basically coincided with interpreted results.
引文
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[3]庄益明,吴亦峰.三维地震勘探解释煤层地质异常体的应用[J].中国煤田地质,2007,19(1).
[4]吴有信.煤矿采区三维地震资料解释中的切片技术及其应用[J].中国煤田地质,2005,17(5).
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