拉拉铜矿隐伏含矿构造地震成像试验研究

发布时间：2018-10-09 10:14

【摘要】：拉拉铜矿周围的红泥坡—绿水靶区存在一处隐伏矿。矿体首先是被点上的钻探工作发现的,后来做过磁法及电磁法勘探,取得了一些小比例尺的面上资料成果。但是在大比例尺精度上了解地层构造以及矿体在横向空间展布情况的时候,常规地球物理的金属矿勘探方法遇到了方法本身的局限。为此,本文打破常规,首次采用地震勘探方法在该地区进行高精度的地层构造以及矿体赋存状况的成像试验。本项研究工作牵涉到的内容比较多,包括地震勘探、多尺度地球物理资料解释、三维地震正演方法技术工具研发以及正演计算分析等方面。这是一个从理论到实践全面覆盖的综合性较强的研究项目。此外,由于地震勘探实验是针对金属矿勘探进行的,工作内容涉及到金属矿反射勘探与折射勘探的震源试验,需要解决数据采集、处理与解释方面的各种特殊问题。因此这也是一项探索性较强的试验工作。本项试验取得了满意的研究结果,包括:(1)利用10条地震剖面,以规则网格的方式对探区地下地层以及矿体的空间展布进行了高密度控制;(2)综合折射波浅部信息和反射波资料的深部信息获得了工区的地震波速度参数模型;(3)在整个工区的反射波资料50 ms到100 ms深度范围内存在的强反射同相轴,揭示了地表松散风化层底界面的埋深;(4)反射地震剖面下部普遍存在能量较强、地震波速较高的地震散射体,不仅与激发极化法资料的异常体深度范围一致,而且与钻探在160 m深度上发现的高品位铜矿资料相吻合,揭示了含矿构造在工区范围内的空间展布情况;(5)此外,本文综合建立了该区域的三维地震结构模型,用有限差分法对进行了三维波动方程正演模拟,通过模拟数据与勘探数据的吻合度,验证了三维地震结构模型的可靠性。本项试验工作全面完成了预定的研究目标。
[Abstract]:There is a hidden ore in the red mud slope-green water target area around Lala Copper Mine. The orebody was first discovered by drilling work on the point, and then it was explored by magnetic and electromagnetic methods, and some data on the surface of small scale were obtained. However, when the stratigraphic structure and the distribution of ore bodies in the transverse space are understood in large scale accuracy, the conventional geophysical methods of metal ore exploration meet the limitations of the methods themselves. Therefore, in this paper, the seismic exploration method is used for the first time to carry out the high-precision imaging tests of stratigraphic structures and the occurrence of orebodies in this area. This research involves many aspects, such as seismic exploration, multi-scale geophysical data interpretation, 3D seismic forward modeling techniques and tools, forward calculation analysis, and so on. This is a comprehensive and comprehensive research project from theory to practice. In addition, because the seismic exploration experiment is aimed at the exploration of metal ore, the work involves the seismic source test of reflection exploration and refraction exploration of metal ore, so it is necessary to solve various special problems in data acquisition, processing and interpretation. Therefore, this is also a strong exploratory experimental work. Satisfactory results have been obtained in this experiment, including: (1) using 10 seismic profiles, The spatial distribution of underground strata and orebodies in the exploration area is controlled by a regular grid method, (2) the seismic velocity parameter model of the working area is obtained by synthesizing the shallow and deep information of refraction wave data, and (3) the velocity parameter model of seismic wave in the working area is obtained by integrating the shallow information of refraction wave and the deep information of reflected wave data. The strong reflection cophase axis exists in the depth range of 50 ms to 100 ms from the reflected wave data of the whole working area. It reveals the buried depth of the bottom interface of the loose weathered layer on the surface. (4) there is a strong energy and high seismic wave velocity in the lower part of the reflection seismic profile, which is not only consistent with the depth range of the anomalous body of the induced polarization method. In addition, the spatial distribution of ore-bearing structures in the working area is revealed. (5) in addition, the 3D seismic structure model of this area is established synthetically in this paper. The forward modeling of 3-D wave equation is carried out by finite difference method. The reliability of 3D seismic structural model is verified by the coincidence between simulated data and exploration data. The experimental work has fully completed the intended research objectives.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P631.4

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