近地表土壤中油气微渗漏烃的赋存特征及化探指标的实验性研究

通过对近地表土壤中渗漏烃类气体不同赋存状态的特征分析,结合已知油气藏上方化探指标(顶空气、游离烃、热释烃、酸解烃等)异常的研究,认为这些指标在同一油气藏上方的不同时期的测试含量会有差异,但在各指标异常范围和变化趋势上仍能显示深部油气藏存在的信息,反映出这些指标的有效性、重现性和稳定性,因此,近地表土壤中不同赋存状态的烃类分析可为有效地利用油气化探指标寻找油气藏提供科学依据.

THE EXPERIMENTAL RESEARCH ON THE OCCURRENCE MODES AND GEOCHEMICAL INDICES OF OIL-GAS MICROPERCOLATED HYDROCARBON IN NEAR-SURFACE SOIL

Based on characteristic analysis of different occurrence modes of percolated hydrocarbon gases in near-surface soil and combined with such geochemical indices over the known oil and gas accumulations as gas over the geological body, free hydrocarbon, heat released hydrocarbon and hydrocarbon by acidolysis, the authors hold that, although the test values of these indices over the same oil and gas accumulation show some differences in different periods, the anomaly range and variation trend of every index remain effective in indicating the information of deep oil and gas accumulation, and this reflects the effectiveness, reproducibility and stability of these indices. Therefore, the analysis of hydrocarbons of different modes of occurrence in near-surface soil can provide scientific basis for the effective utilization of oil and gas geochemical indices to the search of oil and gas accumulations.