地球天然电磁噪声在物探找油中的应用
Application of the Earth's Natural Electromagnetic Noise to Geophysical Prospecting and Seraching for Oil
摘要：
地球脉冲电磁场应用于地球物理勘探时，应考虑其时空变化特征。已知ENPEMF包括归因于大气雷暴的脉冲和岩石圈中通过岩石中的机械到电能转换产生的脉冲。显然，关于某一地区地球物理结构的最有价值的信息显然包含在源自该地区的脉冲中。本文介绍了一种记录地球天然脉冲电磁场空间变化的方法，该方法能充分考虑电磁场的时空变化，适合于揭示包括油气藏在内的地壳结构和岩性非均质性。我们使用一个系统的几个站同时记录的ENPEMF从ENPEMF记录中删除的时间变化，并整理出本地和远程起源的脉冲。有些台站是固定的（参考），只记录电磁场的时间变化。而其他站是移动的，测量脉冲特性的空间和时间的ENPEMF变化沿测量路线穿越该地区的调查。删除时间变化后留下的电磁场的空间变化和区域调查产生的脉冲显示了地球物理异常的可用性或缺乏。
英文摘要：
When applying the Earth's natural pulse electromagnetic fields to geophysical prospecting one should take into account characteristics of their spatial and temporal variations. ENPEMF is known to include both pulses attributed to atmospheric thunderstorms and pulses generated in the lithosphere by mechanic-to-electric energy conversion in rocks. It is evident that the most valuable information on the geophysical structure of a certain area is obviously contained in pulses originated from this area. This article covers a method of recording spatial variations of the Earth's natural pulse electromagnetic fields which is able to take due account of spatial and temporal variations of EM fields and suits to reveal crustal structural and lithologic heterogeneities including hydrocarbon pools. We use a system of several stations recording the ENPEMF concurrently to erase the temporal variations from ENPEMF records and to sort out the pulses of local and remote origin. Some stations are fixed (reference) and record only temporal variations of EM fields. While the other stations are mobile and measure pulse characteristics related to both spatial and temporal ENPEMF variations along measurement routes crossing the area investigated. Spatial variations of EM fields left after having deleted the temporal variations and pulses generated out of the area investigate show the availability or the lack of geophysical anomalies.
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