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地震地质方法历来是寻找油气藏的主要手段,但技术复杂、成本高、成功率较低。用α卡测量在多个已知油田上作了试验,证明了222Rn可以作为油气藏的探途元素,其方法简单,成本甚低。异常特点是低强度的样品点与岩性无关并落在含油区的外围及构造上方,如果不考虑构造断层的影响,则油田边界反映出较高的222Rn异常。本文就异常的形成机理,模型和α卡测量的物理前提作了探讨。
Seismological and geological methods have always been the main means to find oil and gas reservoirs, but the technology is complicated, the cost is high and the success rate is low. It has been proved that 222Rn can be used as an exploration element for oil and gas reservoirs by using α-card measurement in a number of known oilfields. The method is simple and the cost is very low. The anomalous feature is that the low-intensity sample points have nothing to do with lithology and fall on the periphery of the oil-bearing area and the top of the structure. The high 222Rn anomalies are reflected in the oilfield boundary without considering the influence of tectonic faults. In this paper, the formation mechanism of anomaly, the model and the physical premise of α-card measurement are discussed.