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天然γ能谱测井在岩层对比和矿物资源勘探方面的应用是有成效的。它还可能用于区分岩性。方法的原理是分别测量不同天然放射源(钍、铀和钾)的一次γ射线。天然γ能谱测井已成功地用于解决圣巴巴拉河谷的地层对比问题。该河谷的火山灰含钍很丰富,是一个有用的地层对此的时间标志。同样,由于能谱测井可甄别钾射线,因此可用于勘探钾矿床。本文介绍了利用能谱测井和中子活化分析法进行放射性元素野外测定的优越性。在活化测井工作中,通常把中子源和探测单元联结在一起。最适用于金属矿床活化测井的元素有铜、铁和铝等。有可能对上述元素作定量测定。另一个可能的用途是作化学成分和矿物成分的分析,用以判别地质年代或地质事件。通过某些关键性元素(例如硅、铝、锰、钾、氧、铁和钙)的原地定量测定,活化分析也有可能用于区分岩性。
The application of natural γ-ray logging in stratigraphic correlation and mineral resources exploration is effective. It may also be used to distinguish between lithologies. The principle of the method is to measure the gamma rays of different natural sources (thorium, uranium and potassium) separately. Natural γ-ray logging has been successfully used to solve stratigraphic correlation in the Santa Barbara Valley. The volcanic ash in the valley is rich in thorium and is a useful indicator of the timing of this formation. Similarly, the energy spectrum can be used to prospect potash because it can discriminate potassium rays. This article describes the advantages of using EDS and neutron activation analysis for field detection of radioactive elements. In activated logging, the neutron source and detection unit are usually linked together. Most suitable for metal deposit activation logging elements are copper, iron and aluminum. It is possible to make quantitative determinations of these elements. Another possible use is the analysis of chemical composition and mineral composition, to determine geological age or geological events. Activation analysis is also possible for distinguishing lithology from the in situ quantitative determination of certain key elements such as silicon, aluminum, manganese, potassium, oxygen, iron and calcium.