油气化探中热相态碳酸盐指标的研究

A STUDY OF THERMAL PHASE STATE CARBONATEINDlCES IN GEOCHEMICAL OIL-GAS PROSPECTING

土壤碳酸盐△C测量法已成为国内石油化探的一个主要方法，已在地表油气化探不同测量阶段（概查，普查，详查）中使用，并取得了较好的效果，但也发现该法在某些地区测量时地球化学异常不明显。为提高△C测量法的效果使其在不同景观区均获得好的显示，我们进行了较为深入系统的基础性实验研究。本文详细介绍了研究结果，指出了△C法效果差的原因，并提出了在不同景观区采用不同热相态碳酸盐作为有效指标，代替过去仅用△C一个指标进行测量的新方法。

: The soil carbonate △C survey now becomes a major method in China's geocbemical petroleum prospecting and has been used in different stages of surface geochemical oil-gas prospecting (rough survey, reconnaissance and detailed investigation, with fairly good results obtained; nevertheless, it has been found that this method fails to yield distinct geochemical anomalies in some areas. In order to raise the effectiveness of △C survey and make it display anomalies satisfactorily in different landscape areas, we performed rather thorough and systematic basic experimental research. This paper describes in detail the result of the study, and points out the causes of such unsatifactory result in using △C method. It is suggested that carbonates with different sorts of thermal phase state be adopted as effective indices in different landscape areas to replace the previous method which only used a single index (△C) to conduct survey.