油气地表化探中干扰因素的排除及其效果

地下油气藏中烃类垂向运移及其环晕效应已为很多油气田所证实;以此为基础,多指标多参数的油气化探方法在实际工作中得到了广泛应用.但化探效果并不总令人满意,究其原因主要是对地表自然条件的复杂性、油气圈闭类型的多样性及化探异常模式的多样性考虑不足.过去,一般在地质及地表地球化学条件都比较简单的情况下,容易取得化探效果;在复杂的情况下,就很难取得实效.本文通过笔者近年来亲自进行的部分油气化探勘查实例,总结了地表景观、介质等影响因素的排除方法及环晕异常与顶部异常识辨等问题.

THE ELIMINATION OF INTERFERENCE FACTORS IN OIL AND GAS SURFACE GEOCHEMICAL EXPLORATION AND ITS EFFECTS

Vertical migration of hydrocarbon in underground oil and gas accumulation and its ring halo effect have been demonstrated is many oil and gas fields. On such a basis, oil and gas geochemical exploration methods with multi-indices and multi-parameters have been widely used in practical work. Nevertheless, the effects of geochemical exploration have not been always satisfactory, which may be attibuted mainly to the inadequate consideration of such factors as the complexity of natural conditions at surface, the diversity of oil and gas trap types and the diversity of geochemical anomaly patterns. In the past, good geochemical exploration results seemed quite easily obtained in areas where geological and surface geochemical conditions were comparatively simple, whereas it was rather difficult to gain achievements under complex conditions. Based on some examples of oil and gas geochemical exploration conducted by the authors in recent years,the present paper has summarized the methods for eliminating such interference factors as surface Indscape and media as well as the problems of discriminatiog ring halo anomalies from top anomalies.