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按赋存介质类型和与介质作用方式 ,油气微渗漏组分可以划分为挥发态、水溶态、吸附态、吸收态、包裹态和化合态。目前已根据不同赋存形态确立了十多种油气地球化学勘探方法。提出评价地球化学勘探方法检测油气有效性的油气指示性指标(SI)。用该指标评价鄂尔多斯盆地不同地区中所应用的 5种地球化学方法 ,依SI值由大到小的排序为 :微量元素电化学提取 ,酸解烃 ,热释汞 ,金属总量分析和蚀变碳酸盐 (二者SI值相同 )。有效性评价结果表明 ,微量元素吸收态的电化学提取方法具有很好的油气指示性和对油气藏边界的分辨能力 ,微量元素的谱图分析可作为油气微渗漏异常属性评价的一种新手段。图2表 1参 1 0
Depending on the type of media and the mode of interaction with the medium, microleakage components of oil and gas can be divided into volatile, water soluble, adsorbed, absorbed, entrapped, and combined states. At present, more than ten kinds of oil and gas geochemical exploration methods have been established according to different occurrences. A hydrocarbon indicator (SI) is proposed to evaluate the effectiveness of geochemical exploration methods for the detection of oil and gas. The five geochemical methods applied in different parts of the Ordos Basin are evaluated by this indicator. The order of decreasing the SI values is: Electrochemical extraction of trace elements, acid hydrolysis of hydrocarbons, pyrolysis mercury, total metal analysis and alteration Carbonate (both SI values the same). The evaluation results of the validity show that the electrochemical extraction method of trace element absorption has good indication of oil and gas and resolution of the boundary of the reservoir, and the trace analysis of trace elements can be used as a new evaluation of the abnormal property of micro-leakage of oil and gas means. Figure 1 Table 1 reference 1 0