Abstract: The method of measuring radioactive radon in the soil is simple,economic and effective.It can define the range of oil field through finding the transitional belt of oil and water underground.The mech chanism is that the natural γ goes from strengh to weakness from oil layer to the earth's surface in vertical section,and the natural γ goes strong in the border and weak above the oil layer in different oil layers in plane.Experiments show that whether structural reservoir or lithologic reservoir or other kind of reservoir,the existing of abnormal radon is clear.Using this method evaluate sand boby,the result not only tallied with test well information,but also the two affirmed and negated test wells have been confirmed by drilling in later period.The prediction to a certain structure in new region has been verified.Defined borders in rolling developed area coincide with reality of production.This method can provide new developed well location for extending border in old region.

Key words: radon, oil-water boundary, reservoir type, evaluation, predict, application

摘要： 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γ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.

关键词: 氡, 油水边界, 油藏类型, 评价, 预测, 应用