石油普查中放射性同位素222Rn测量及其效果

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.

THE RADIOACTIVE ISOTOPE 222Rn SURVEY IN OIL PROSPECTING AND ITS EFFECT

Seismic prospecting has been a traditional means in search for oil-gas reser-voirs; nevertheless, it has such disadvantages as complicated -technology, high cost and less success. The a card measurement test performed in a number of oilfields indicates that ²²²Rn can serve as a pathfinder element for oil-gas re servoirs. Its technique is quite simple and its cost is extremely low. Anomali es are characterized by the phenomenon that the sampling points of low inten sity have nothing to do with the lithologic characters and fall to peripheral areas of the oil-bearing district or over the structure. If the effects of struc tural faults are not considered, the boundary of the oilfield is likely to be indi cated by relatively high 222Rn anomalies. This paper makes a tentative discuss ion on formation mechanism and model of the anomaly and physical prerequi site for a card measurement.