土壤放射性测氡是一种简便易行、经济快速、效果十分明显的勘探方法。该方法是通过寻找地下油水过渡带，确定油田边界来实现勘探目的；它的机理可以从纵向上，自然从油层到地表由强到弱渐变，平面上油层上方不同层面井中自然呈油田周边强顶部弱的特征得到证实。试验表明，无论是含油区还是含气区，是构造型还是岩性型油气藏，对应其边缘都存在明显的氡值异常。无油气的空构造圈闭区不存在氡异常。应用土壤测氡评价砂体含油性，其成果不但与已知相吻合，肯定和否定的两口探井也被后期钻探所验证。对新区某构造含工业气的预测结果得到了证实，为滚动开发区确定的边界与生产实际相一致。该方法为老区扩边提供了新的开发井位，显示了良好的应用前景。 Radon measurement of soil radioactivity is a simple and easy to operate, economic and rapid, the effect is very obvious exploration methods. The method is to search for the transition zone of oil and water in the subsurface and determine the boundary of the oil field to realize the exploration purpose. Its mechanism can change from strong to weak vertically and naturally from the oil layer to the ground surface. Strong weak top features have been confirmed. Experiments show that either oil-bearing or gas-bearing zones are tectonic or lithologic reservoirs with obvious radon anomalies corresponding to their edges. There is no anomalon of radon in the empty zone without oil and gas. The application of soil radon to evaluate the oil content of sand bodies not only matches the results with the known results, but also validates and negates the two exploration wells which have been verified by later drilling. The forecast result of industrial gas with a certain structure in a new district has been confirmed. The boundary defined for rolling development zone is consistent with the actual production. The method provides a new development well for the expansion of the old area and shows a good application prospect.