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利用有机地球化学方法中的氯仿“A”抽提、族组成、气相色谱、砂岩热解对储集层中的油气进行定量分析，判断油、气、水层，评价油层原油性质及估算产能，是一种有效的油藏地球化学评价方法。该方法可以大大提高油层解释的准确度，对油层定量评价，特别是在新盆地、新区块，对油气层的正确认识有很大的实用价值。
The oil and gas in the reservoir were quantitatively analyzed by using “A” extraction of chloroform, organic composition, gas chromatography and sandstone pyrolysis in the organic geochemical method to evaluate the properties of the crude oil in the reservoir and estimate the productivity. It is an effective reservoir geochemical evaluation method. The method can greatly improve the accuracy of interpretation of the oil layer. The quantitative evaluation of the oil layer, especially in the new basins and new blocks, has great practical value for the correct understanding of the hydrocarbon layer.