航磁梯度在地质解释中的应用研究

发布时间：2018-02-16 08:54

本文关键词： 航磁梯度转换处理方法技术应用解释优势分析　出处：《中国地质大学(北京)》2016年博士论文　论文类型：学位论文

【摘要】：完成了磁梯度数据的转换处理方法理论研究,主要包含有梯度数据上延理论公式推导、模型理论研究和实例应用分析,理论公式的推导证明航磁梯度数据完全可以作相应的化极转换处理,但是通过理论模型试验发现在地磁倾角大于20°的工作区域采集到的梯度数据可以进行化极处理,而在地磁倾角为0°—18°之间的梯度数据经过化极后的效果并不理想,即在这个纬度区间内梯度数据的化极作用并不能得到很好地体现;梯度数据上延理论公式推导、模型理论研究和实例应用分析,梯度数据的上延处理突出了浅部的异常体,对相对埋藏较深的异常体进行了压制,但这是在梯度数据相对于总场而言突出浅部异常体的前提下成立的,这为在梯度解释中分离深部异常体和浅部异常体提供了有效证明;斜导数方法在地质体边界上的提取理论模型研究和实例应用分析,通过模型试验和实际数据的应用可知,利用斜导数方法判断地质体边界具有较好的地质效果,另实测的梯度数据的利用斜导数方法的反映好于由总场转换而来的梯度数据。利用航磁及航磁梯度数据,运用所研究的化极、上延及斜导数方法等开展了保定梯度试验区的地质找矿解释方法技术研究,对保定梯度试验区开展了异常选编、岩体边界圈定、断裂构造划分及找矿远景区划分的主要工作,并形成了一套利用梯度数据开展地质解释的思路,为今后利用梯度数据进行地质解释奠定了基础。分析了梯度数据在断裂构造划分、压制和提取异常信息及磁和磁梯度数据联合研究减少地质多解性的特点。同时分析了梯度数据在异常提取方面的优势,梯度数据反映的是高频成分,也就是浅部磁性地质体所产生的异常信息,浅部的异常信息应该位于能进行正常的人工采矿作业的深度位置,有可能更深,因此对于浅部的矿产所产生的异常信息,梯度数据是完全能够反映出来的。另外,航磁全轴梯度的测量在中低纬度和低纬度地区具有航磁总场测量无可比拟的优势,那就是航磁总场数据在进行岩体圈定、构造推断解释和成矿远景预测时需要进行化极或化赤后才能进行位场数据处理,也就是算出梯度数据,从而进行较准确的分析,而中低纬度和低纬度地区的化极和化赤问题一直被公认为是比较难的课题,即使做了化极或化赤处理,效果的理想程度还有待于进一步的确认,但是如果采集航磁全轴梯度数据,不仅直接得到了梯度数据,而且还可以利用梯度数据转换成总场数据配合实测的梯度数据进行异常的选编工作,大大降低了工作难度。
[Abstract]:Complete conversion of magnetic gradient data processing method of theoretical research, mainly includes gradient data extension of theoretical derivation, theoretical research and case analysis application model, the theoretical formula of aeromagnetic gradient data can prove the corresponding pole conversion processing, but through the theoretical model test found the work area to collect the gradient data more than 20 degrees in the geomagnetic inclination can be reduced to the pole, and the geomagnetic inclination for gradient data between 0 ~ 18 degrees after the pole effect is not ideal, namely gradient in this latitude range data of polar effect and can not be well reflected; gradient data extension formulas are derived. The theory study and case analysis application model, gradient data extension processing highlights the shallow anomaly, the anomaly body relatively deep were suppressed, but this is in relative gradient data The establishment of prominent shallow anomaly in the premise of the total field, which provides effective evidence for the separation of the deep and shallow anomaly anomaly in gradient interpretation; analysis of oblique derivative method in geological body boundary extraction theory model research and application, through the application of the model test and the actual data, judgment the geological boundary has good geological effect by the oblique derivative method, gradient data using oblique derivative method to reflect the gradient data measured is better than the other from total conversion comes. Using aeromagnetic and aeromagnetic gradient data, by applying the research on pole, and the tilt derivative method to carry out geological Baoding gradient test prospecting methods of interpretation technology, Baoding test area to carry out the selection of gradient anomaly, rock boundary delineation, mainly tectonic division and prospecting area division, and the formation of arbitrage Geological interpretation of the idea of developing the gradient data, laid the foundation for the future use of gradient data for geological interpretation. Analysis of gradient data of fault structure in division, pressing and extracting anomaly information and magnetic gradient data combined with geological study to reduce the ambiguity characteristics. At the same time analyzed the gradient data in the anomaly extraction advantage the gradient data reflect the high frequency components, the abnormal information is generated by the magnetic geologic body in shallow, shallow anomaly information should be located to the normal position of the depth of artificial mining operations, there may be deeper, because of the abnormal information about shallow mineral produced by gradient data is able to reflect. In addition, the measurement of aeromagnetic axial gradient has the advantages of aeromagnetic total field measurement There is nothing comparable to this at middle and low latitudes and low latitudes, the aeromagnetic total field data in the delineation of rock mass, Tectonic and metallogenic prediction interpretation requires extreme or red to potential field data processing, also is to calculate the gradient data, then carries on the analysis more accurate, while the low latitude and low latitude area of the pole and the red has been recognized as a difficult task, even if the polar or red, ideal effect has yet to be further confirmed, but if the acquisition of aeromagnetic axial gradient data, not only from the gradient data, but also can be converted into the data field with gradient data measured by abnormal selection gradient data, greatly reduce the difficulty of the work.

【学位授予单位】：中国地质大学(北京)
【学位级别】：博士
【学位授予年份】：2016
【分类号】：P631.222

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