丘陵地貌条件下并行电法的勘探实践研究

发布时间：2017-12-28 01:36

本文关键词：丘陵地貌条件下并行电法的勘探实践研究　出处：《安徽理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：电阻率法作为一种重要的地球物理探测方法,在解决水文、工程地质问题,在寻找金属和非金属矿产,在石油、煤田和地热等资源的勘探中都得到广泛的应用,山区丘陵地带工程地质探查任务逐渐增多,而此类地区地形条件复杂,起伏多变的地貌特征成为了电法勘探必须面对的难题,尤其是探查分辨率的提高是探查结果精度的保证。实际工作中,起伏地形条件下浅层介质探测精度和分辨率受诸多因素的干扰影响,因此需要进行专门的技术研究,为特殊地表条件探查提供基础。论文结合复杂地形条件下并行电法探查技术与应用展开讨论,从不同的深度、装置等方面入手,以有限元数值模拟为研究手段,分别对温纳-斯伦贝尔、二极、偶极-偶极、偶极-梯度、单极-偶极五种电法常用电极排列装置进行地形正演模拟,对模拟结果进行分析,总结地下探测分辨率的影响因素,并结合现场探查实验取得良好的应用效果和认识。丘陵地区地形条件复杂,通过模拟与对比得到:五种装置均能很好的完成地下地下异常体的探测,探测精度和分辨率各有优势,二极装置的探测深度最深,但是,其在起伏地形条件下的分辨率最差,且在地下起伏地层的探测中不能很好的体现地层起伏变化,无法呈现地下真是地层状况,且在异常体探测时,异常区域有被拉大的情况;偶极-梯度装置在起伏地形条件下的探测效果比较好,但其在探测地形起伏时,无法完成探测工作,未能还原地下地层分布情况;温纳-斯伦贝尔结合了温纳与斯伦贝尔装置两种的特点,在探测深度及横向分辨率方面表现优异;偶极-偶极装置无论在起伏地层还是起伏地形条件下,其探测精度和分辨率都比较理想,很好的反映了地下异常体或地层的形态特征等。深度对探测效果和精度能产生一定的影响,在相同装置、地质条件下,装置的纵向分辨力随着异常体深度的增加在逐渐减弱,表现在对地电体的相对位置、埋深以及形态等各方面分辨能力的减弱,同时对异常区域周围边界的界定及顶底分界面的反映能力也呈现出在递减形态,且异常特征的复杂性也逐渐提高。从而可以得出结论:装置的探测深度制约着其对地下异常体的分辨率,影响探测效果。
[Abstract]:The resistivity method as a important geophysical exploration method, to solve the hydrological and engineering geological problems, looking for metal and non-metallic minerals, is widely used in petroleum, coal and geothermal resources exploration in mountainous areas, the engineering geological exploration task gradually increased, and the terrain landform in this area complex. The variations of the fluctuation has become a problem of electrical exploration must face, especially the exploration of high resolution is to guarantee the precision of exploration results. In practice, the accuracy and resolution of shallow media are affected by many factors under the condition of undulate terrain. Therefore, special technical research is needed to provide a basis for the exploration of special surface conditions. The combination of parallel electrical exploration technology and application discussion under complex terrain conditions, from the aspects of different depth, device, using the finite element numerical simulation, respectively on the Wenner Schlumberger Seoul, dipole dipole, dipole dipole and dipole and monopole dipole gradient of five kinds of electrical common electrode array device for terrain is the simulation, the simulation results were analyzed and summarized and the factors influencing underground detection resolution, combined with field exploration experiment achieved good application effect and understanding. Complex terrain conditions in hilly area, obtained by simulation and comparison: detection of five kinds of devices were able to complete the underground underground abnormal body good, detection accuracy and resolution of the advantage, the deepest depth detection diode device, however, in the rugged terrain resolution is the worst, and does not reflect the formation changes very the ups and downs in the exploration of underground strata, it is unable to present the underground strata, and the anomaly detection, anomaly area has been widened; the detection effect of dipole gradient device in rugged terrain is better, but the detection of the terrain, unable to complete the detection work, failed to restore underground distribution; Seoul with Wenner Schlumberger Wenner and Schlumberger's device characteristics of two, excellent performance in detecting depth and lateral resolution; the dipole dipole device both in formation or fluctuation Under the condition of undulating terrain, the detection accuracy and resolution are ideal, and it is a good reflection of the morphological characteristics of underground abnormal bodies or strata. The depth can have a certain impact on the detection performance and accuracy, in the same device, geological conditions, the axial resolution of device with abnormal depth increases gradually weakened, weakening performance resolution in the relative position of the geoelectric body buried the depth and shape, at the same time to define and abnormal areas around the border the ability to reflect the interface of top and bottom is also showing a decline in morphology, complexity and abnormal characteristics is gradually increased. It can be concluded that the detection depth of the device restricts the resolution of the underground abnormal body and affects the detection effect.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P631.3

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