【摘要】 <正> 利用近地面土壤吸附烃的研究成果,指示地下油、气藏的区域展布规律,是石油化探的基本方法之一。但是,在应用时应该注意两个方面的重要影响。第一,某些现代沉积物可能生成烃气,被保留在土壤中。第二,不同类型的土壤,具有不同的物理化学性质和地球化学背景,致使对烃气的吸附性能存在较大的差异性。为了避免这些影响因素的干扰,必须谋求一个合理的工作方法。笔者曾在同一地区,利用不同的方法,进行了三次实验研究工作,试图对上述问题作一肤浅的探讨,本文的实验数据均系101队分析。更多还原

【Abstract】 It is known that saturated gaseous hydrocarbons can find their way upwards to the earth’s surface through infiltration and diffusion, creating adsorbed-on-soil hydrocarbon anomalies. Research data from the Dongying Depression show that the concentration of gaseous hydrocarbons adsorbed on surface soil is closely related to the pedogenetic environment, and the grain size of soil as well as the contents of organic carbon, calcium carbonate, and iron or aluminium oxides in the soil.Soil samples collected at the same depth are usually representative of different sediments formed under different geological backgrounds, so there exist significant differences in geochemistry for various soils. For this reason, the amount of adsorbed gaseous hydrocarbons is quite different from one soil to another. If this is not taken into consideration, the hydrocarbon anomalous zone outlined is of no indicative significance for oil and gas fields. Only soil samples are collected from the same selected layer, so that the nature of samples and the geological background may be consistent with each other, is a hydrocarbon anomalous zone so defined of indicative significance for oil and gas fields. Petroleum exploration practice has proved successful in the new target areas.更多还原