土壤△C碳酸盐的分析方法及石油化探应用

本文介绍一种新的石油化探方法——土壤热释碳酸盐(△C)法.该方法以测定地表土壤中热释二氧化碳为基础.油气田上方烃类气体在向上迁移的过程中,从还原环境穿过潜水面,到达近地表氧化环境时,被氧化生成CO₂,由CO₂产生的重碳酸根与近地面土壤中的阳离子结合,生成次生碳酸盐,造成土壤碳酸盐蚀变. 

ANALYSIS OF AC CARBONATE IN SURFACE SOIL AND ITS APPLICATION TO PETROLEUM EXPLORATION

A novel method of petroleum geochemical exploration is introduced in this paper,i.e.the thermo-released analysis of AC carbonate in surface soils.AC carbonate referred here means the secondary carbonates which were derived from hydrocarbons and bought about erosion to the surface soils.Such an erosive carbonate is named as AC carbonate which occurs in the crystal lattices of surface soils with invariant content not effected external conditions.In view of its generative relation to hydrocarbons,positive abnormal geochemical haloes formed at surface could be used as indication of oil/gas pool in the underlying strata.The analytical method of AC is studied systematically in this paper.AC analytic device is designed and the analytical procedures of AC carbonates are established after various conditions have been tested.Furthermorer,the method is applied to petroleum exploration of various areas in combination with geochemical researches in order to test the feasibility of the method.