结合实见构造对地震资料再解释
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摘要
西山煤电集团公司自2001年至今已施工三维地震勘探面积22.8km2,目前近1/3的采区已进行了井下采掘工程,验证其三维地震资料准确率在30%～55%之间。利用实见矿井地质构造资料对三维地震资料进行再解释,发现漏报、误报、错报地质构造的原因有多种:一是在资料处理时,使用剩余静校正等手段容易造成与小构造有关的煤层反射波异常特征弱化现象;二是三维地震线束方向与地质构造发育方向近乎平行,导致异常反映较差;三是煤层埋藏过浅,最大炮检距过大,造成动校拉伸畸变,导致信噪比与分辨率的降低;四是对矿井地质构造发育规律认识不清。通过已揭露的地质构造资料对地震资料异常特征的重新解释,新发现了不少中小型构造,表明三维地震勘探只有紧密结合采区生产实践,才能有效解决勘探报告与实见构造相矛盾的问题。
From 2001 up to the present,the Xishan Coal Electricity Group Co.Ltd.has carried out 3D seismic prospecting 22.8km2,about 1/3 winning districts carried out underground mining works,validated 3D seismic data accuracy 30%～55%.After reinterpretation of seismic data combined with mine actual structures have found that causations of non-disclosure,misinformation and misstatement of structures have: the first is means of residual statics etc.during data processing easy to cause minor structure related coal seam reflection wave anomalous characteristic attenuation;the second is near parallel 3D seismic wave packet direction and structure development direction caused poor anomalous reflection;the third is too shallow coal seam depth and too large offset caused dynamic correction stretching distortion and lowering down S/N ratio and resolution;the fourth is imperfect knowledge on coalmine geologic structure development orderliness.Through revealed structural data to reinterpret anomalous characteristics in seismic data have found many new medium and minor structures,thus indicated only if closely combined with winning district production practice,3D seismic prospecting can solve contradiction between prospecting report and actual structures.
From 2001 up to the present,the Xishan Coal Electricity Group Co.Ltd.has carried out 3D seismic prospecting 22.8km2,about 1/3 winning districts carried out underground mining works,validated 3D seismic data accuracy 30%～55%.After reinterpretation of seismic data combined with mine actual structures have found that causations of non-disclosure,misinformation and misstatement of structures have: the first is means of residual statics etc.during data processing easy to cause minor structure related coal seam reflection wave anomalous characteristic attenuation;the second is near parallel 3D seismic wave packet direction and structure development direction caused poor anomalous reflection;the third is too shallow coal seam depth and too large offset caused dynamic correction stretching distortion and lowering down S/N ratio and resolution;the fourth is imperfect knowledge on coalmine geologic structure development orderliness.Through revealed structural data to reinterpret anomalous characteristics in seismic data have found many new medium and minor structures,thus indicated only if closely combined with winning district production practice,3D seismic prospecting can solve contradiction between prospecting report and actual structures.
引文
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[2]程保洲.山西晚古生代沉积环境与聚煤规律[M].太原:山西科学技术出版社,1992.
[3]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].中国煤炭地质,2007,19(S2).
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