Abstract: Geochemical exploration is one of geological prospecting method for oil and gas.An important role has been played by such a technique in finding oil and gas over years.The presence of trace amount of light hydrocarbons in surface soil or in ground water,however,are either the micro-seepage from subfurface hydrocarbon accumulations or other sources due to photodecomposition of organic matters and microorganism activities.This paper gives a discussion on the screening out of significant information from surface geochemical data based on a comprehensive study and computer processing of the data as well as improvement of sampling methods in order to enhance the successful ratio in predicting the potential hydrocarbon deposits.

摘要： 化探是油气勘探的方法之一,在找油气方面发挥了一定的作用,近地表检测油气微渗漏形迹具有多解性。本文从化探工作布署原则、野外采样方法、数据电算处理、综合研究及评价方法等方面探讨了化探资料中提取油气信息的技术与方法,提高了化探预测的成功率。