地震初至波速度层析反演在多金属矿探测中的应用
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摘要
多金属矿区由于含矿岩体结构与岩性的特殊性,地震反射波法一般应用效果较差。利用地面长排列接收到的初至波场信息建立初始速度模型,针对复杂地表和介质条件下,利用旅行时线性插值射线追踪方法(LTI方法)进行的初至波射线追踪正演模拟以及带松弛因子的联合迭代重建算法(SIRT)进行速度层析反演,获取与矿体或岩体的结构与岩性变化有关的速度场信息,以求解探测目标的分布范围和展布特征。结果表明,反演速度场中的异常变化带与地表地质调查结果中的矿体分布以及断裂构造吻合较好。因探测深度可达到数百米,可为浅层隐伏矿体和构造等的确定提供较可靠的依据,该方法技术可行。
Since the particularity of the ore rock structure and lithology in multi-metal mining area,it's difficult for seismic reflection to form a continuous and stable and gentle reflecting interface,and the application of seismic reflection method are generally not effective.This paper established a initial velocity model by using the first break information which was received by means of the ground long arrangement,then utilized the first arrival ray tracing forward modelling and SIRT velocity tomographic inversion technique in the complex surface and medium conditions,which did not rely on the existence of the bed interface,to obtain the velocity field information about the structure and lithology changes of ore bodies or rock bodies,and then the distribution range and exhibition characteristics of the detection target were acquired.The testing results show that the method is feasible,and anomalous changes of the velocity inversion coincide with the results of geological survey.Since the detecting depth of this method can reach hundreds of meters,it could provide a reliable basis for the detection of shallow insidious ore bodies and structures.
Since the particularity of the ore rock structure and lithology in multi-metal mining area,it's difficult for seismic reflection to form a continuous and stable and gentle reflecting interface,and the application of seismic reflection method are generally not effective.This paper established a initial velocity model by using the first break information which was received by means of the ground long arrangement,then utilized the first arrival ray tracing forward modelling and SIRT velocity tomographic inversion technique in the complex surface and medium conditions,which did not rely on the existence of the bed interface,to obtain the velocity field information about the structure and lithology changes of ore bodies or rock bodies,and then the distribution range and exhibition characteristics of the detection target were acquired.The testing results show that the method is feasible,and anomalous changes of the velocity inversion coincide with the results of geological survey.Since the detecting depth of this method can reach hundreds of meters,it could provide a reliable basis for the detection of shallow insidious ore bodies and structures.
引文
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[2]刘盛东,李承华.地震走时层析成像算法与比较[J].中国矿业大学学报,2000,29(2):211-214.
[3]张建中,陈世军,余大祥.最短路径射线追踪方法及其改进[J].地球物理学进展,2003,18(1):146-150.
[4]潘艳梅,董良国,刘玉柱,等.近地表速度结构层析反演方法综述[J].勘探地球物理进展,2006,29(4):229-235.
[5]王运生,苏建黎.浅层地震联合成像技术及其应用研究[J].工程地球物理学报,2007,4(4):306-311.
[6]裴正林,余钦范.井间地震走时波形层析成像方法[J].现代地质,2001,15(3):333-338.
[7]荣立新.应用于金属矿勘查中的地面地震层析成像技术[J].物化探计算技术,2007,29(增刊):125-129.
[8]Asawaka E.Seismic ray tracing using linear travel time interpola-tion[J].Geophysical Prospecting,1993,41(1):99-112.
[9]Wan Xiong,Gao Yiqing,Yu Shenglin.Study of limited-viewtomography algorithms for plasma diagnostics[M]//WengZhicheng,Sasian Jose M,Wang Yongtian.Optical Design andTesting(Proceedings Volume).Washington:SPIE Press,2002:625-633.
[10]Wan Xiong,Yu Shenglin,Gao Yiqing,et al.Self-adaptive re-construction algorithm for emission spectral volume tomography[J].Optical Engineering,2004,43(5):1244-1250.
[11]周小仙.利用地震反射和折射联合层析成像探测深部构造方法研究[D].北京:中国地质大学(北京),2010:1-50.
[12]马德堂.弹性波场数值模拟及井间地震初至波旅行时层析成像[D].西安:长安大学,2005:1-20.
[13]景月红.地震初至波旅行时层析成像与近地表速度建模[D].西安:长安大学,2009:1-20.
[14]杨文采.地球物理反演和地震层析成像[M].北京:地质出版社,1989:1-20.
[15]吴律.层析基础及其在井间地震中的应用[M].北京:石油工业出版社,1997:1-20.
[16]Nolet.地震层析成象及应用[M].王椿镛,吴远宁,李幼铭,等译.北京:学术书刊出版社,1989:1-20.
[17]江西省地质矿产勘查开发局.银坑、黄石幅1∶5万区域地质调查报告[R].南昌:江西省地质矿产勘查开发局,1995.
[18]江西省地质矿产勘查开发局赣南地质调查大队.于都—赣县矿集区银坑示范区地质剖面测量成果[R].赣州:江西省地质矿产勘查开发局赣南地质调查大队,2010.
[19]江西省地质矿产勘查开发局赣南地质调查大队.江西省于都县银坑矿田江背—刘屋地质剖面图(145线)[R].赣州:江西省地质矿产勘查开发局赣南地质调查大队,2010.
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