地下水中铀的油气化探意义及其应用

THE SIGNIFICANCE OF GROUNDWATER-BORNE URANIUMIN OIL-GAS GEOCHEMICAL PROSPECTING ANDITS APPLICATION

经过20多年的实验研究,逐渐认识了地下水中铀的油气化探意义和特性,从而掌握了它对油气的指标意义,并在油气化探中得到了应用。油田水和深层地下水由于处在还原和弱还原环境中,铀的浓度分异效应不显著;潜水处于氧化环境中,铀的浓度分异效应显著,储集着与油气有关的信息。文章阐述了油气藏上方潜水中铀的异常特征,接着论述了铀指标的特性,即稳定性、直观性和单一性。最后以松辽中央拗陷南部和东濮凹陷为例,介绍了应用实例。

Abstract: As a result of more than 20 years' experimental studies, we have gradually understo-od the mechanism and behaviors of groundwater-borne uranium in oil-gas geochemical prospecting, realized its index significance for oil and gas and applied it in oil-pas geochemical prospecting. As oil-field water and deep groundwater lie in a reduction or weak reduction environment, the concentration differentiation effect of uranium is not obvious; in contrast, phreatic water is in an oxidation enviornment and hence exhnoits apparent concentration differentiation effect, which undoubtedly preserves information related to oil and gas. This paper describes characteris-tics of uranium anomalies in phreatic water over the oil and gas accumulation, and deals with properties of the uranium index, i. e. stability, direct perceivability and singleness. With the southern part of Songliao central depression and Dongpu depression as examples, the paper also introduces its practical application.