油气微渗漏组分的赋存形态及其油气指示性

Speciation analysis of hydrocarbon microseeping components and their indicatives of oil and gas resources.

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

According to the nature of speciating medium and its form of interaction with the medium, speciation forms of hydrocarbon micro seeping components in soil and rocks include:(1) volatile, (2) solution, (3) adsorption, (4) absorption,(5) inclusion,and (6) combination. Extraction of different speciation forms of hydrocarbon micro seeping components has established more than ten geochemical methods for oil and gas exploration. An indicative index of oil gas resources ( SI ) is proposed to evaluate effectiveness of the geochemical methods. From estimating SI for 5 utilized methods (hydrocarbon acidolysis, mercury thermolysis, alteration carbonate, trace element electrochemically extracting and total metal analysis) for oil and gas detection in Ordos basin, their effectiveness is evaluated in the following order: trace element electrochemically extracting > hydrocarbon acidolysis > mercury thermolysis > total metal analysis = alteration carbonate. The results show that trace element electrochemically extracting method by utilizing absorption form of hydrocarbon micro seeping trace elements has good indicativity of oil gas resources and resolution for reservoir boundary, and that the spectral diagram of extracted trace elements can be used as a new tool to evaluate the attributes of the hydrocarbon microseepage anomalies.