复杂金属矿体地震波正演模拟研究-以庐枞罗河-泥河-大包庄矿床为例
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国家科技专项“深部矿产资源立体探测技术与试验(SinoProbe-03)”与国家危机矿山接替资源勘查专项新技术方法项目(200699065)


The Research of Seismic Modeling in Complex Metal Ore Region-Take Luzong Luohe-Nihe-Dabaozhuang Deposits for an Example
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    摘要:

    地震勘探在金属矿勘查中发挥越来越重要的作用,但复杂的介质结构、矿体形态通常使金属矿地震解释异常困难,为深入研究复杂金属矿体的地震波场特征,有效开展金属矿地震解释,本文以庐枞矿集区的罗河、泥河和大包庄矿床为例,在详细开展物性测量和地质与地球物理建模的基础上,对均匀介质复杂矿体模型、简单矿体模型和随机介质简单矿体模型进行了金属矿地震波场模拟研究。使用波动方程交错网格有限差分法对模型进行正演模拟,并对模拟结果做叠后偏移处理,分析了各种模型的波场特征,并与实际矿区地震反射剖面进行了对比。结果表明:含磁铁矿、黄铁矿的金属矿体与火山沉积岩、熔岩等围岩都有明显的波阻抗差异,理论上可以用反射地震方法进行深部矿床勘探;对似层状的复杂矿体,当其厚度远大于(4-5倍)地震信号的理论分辨率(/4)时,反射地震可以探测复杂矿体的结构形态;矿体陡倾时,反射能量明显减弱或消失;随机介质与实际介质更接近,当不均匀程度大于5%或更大时,散射噪声将淹没矿体有效反射信号。波场模拟与实际地震剖面对比结果表明,反射地震在实际矿区的应用,面临的挑战要大很多,其中干扰、介质的不均匀性、矿体的形态是影响地震勘探效果的主要因素。

    Abstract:

    Seismic exploration plays an increasingly important role in the metal ore exploration, But the seismic interpretation in ore district is often extremely difficult because of the complex structures and ore bodies shape. To study the wave field characteristics of complex metal ore and effective seismic interpretation, this article take Luohe, Nihe and Dabaozhuang mineral deposits in the Luzong ore area as an example, elaborate how do the petrophisical property statistics and manufacture the geology and geophysics models using the drill hole data in the complex geological condition, where rock is serious alteration and changeable. Establish the complex and simplified geophysical models respectively, and generate random medium model using different random parameters based on simplified model. We apply the wave equation staggered grid finite difference method to model the wave field, and process the simulated data by poststack migration. Discuss the wave field characteristics of each model, and compare with the actual data profile. The result show that: There is obvious impedance difference between ore body with magnetite, pyrite and volcanic sedimentary and lava rocks, the reflection seismic method can be used in deep mineral deposits exploration in theory; Reflection seismic method can be used to prospect complex ore body’s structure for the stratiform-like deposit when the thickness is much larger than (4-5 times) the theoretical resolution (/4) of seismic signals; When the ore body steep and sloping, the reflection energy is obvious weakened or loss out; Random medium is closer to the actual medium, when the level of heterogeneous is greater than 5%, the reflection signal will be submerged in scatter noise. The result of comparative analysis of wave field simulation and the actual seismic profiles indicate that: seismic reflection method faces great challenge in the actual ore district, the noise, heterogeneous in medium and ore body shape are the main factors in influencing seismic exploration.

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引用本文

廉玉广,吕庆田,韩立国,赵金花.2011.复杂金属矿体地震波正演模拟研究-以庐枞罗河-泥河-大包庄矿床为例[J].地质学报,85(5):887-899.
Lian Yuguang, Lv Qingtian, Han Liguo, Zhao Jinhua.2011. The Research of Seismic Modeling in Complex Metal Ore Region-Take Luzong Luohe-Nihe-Dabaozhuang Deposits for an Example[J]. Acta Geologica Sinica,85(5):887-899.

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  • 收稿日期:2011-03-28
  • 最后修改日期:2011-03-28
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  • 在线发布日期: 2011-05-16
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