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应用油田水中的水溶烃对有争议的鄂尔多斯盆地天然气的成因进行研究,从而为天然气的成因提供了新的证据:中部气田奥陶系马家沟组水溶烃样品的水溶烃组成中轻组分含量高,重质成分含量低.陕12井和陕78井地层水水溶烃中具有相对较高丰度的三环萜烷.三环萜烷/藿烷的比值分别达到1.48和0.36.孕甾烷和升孕甾烷丰富,藿烷/甾烷低,Pr/Ph低于2.0,反映出以海相碳酸盐有机质生源为主要特征.陕81井样品,三环萜烷和孕甾烷和升孕甾烷缺失,藿烷/甾烷高,Pr/Ph为3.27,主要反映出陆相源岩有机质的贡献.陕37井和陕34井具有微量的三环萜烷,则可能为碳酸盐和陆源有机质混源特征.成熟度参数也同样支持上述推论,以海相碳酸盐有机质生源为主要特征的陕12井和陕78井具有较高的成熟度,而以陆相源岩有机质的贡献为主的陕81井则成熟度最低.具有混源贡献的陕37和陕34井样品的成熟度则介于二者之间.
Hydrolysed hydrocarbons in oilfield water are used to study the origin of natural gas in the controversial Erdos basin, which provides new evidence for the origin of natural gas. The water-soluble hydrocarbons in the Ordovician Majiagou Formation in the central gas field are lightly-fractionated High and heavy content.The content of tricyclic terpanes in the water-soluble hydrocarbons in the formation water of Shan 12 well and Shaan-78 well is relatively high.The ratio of tricyclic terpane / hopane reaches 1.48 and 0.36, respectively.Pregnantane And rose pregnane rich, low hopane / sterane, Pr / Ph less than 2.0, reflecting the marine carbonate organic matter source as the main characteristics of Shaan 81 well samples, tricyclic terpanes and gestaistane and l Progesterine is missing, hopane / sterane is high, Pr / Ph is 3.27, which mainly reflects the contribution of organic matter from continental facies source rocks.There are trace amounts of tricyclic terpanes in Shan37 and Shan34 wells, which may be carbonate and terrestrial Organic matter mixed source characteristics.The maturity parameters also support the above inference that the Shan 12 well and the Shaanxi 78 well, which are mainly characterized by marine carbonate organic source, have higher maturity, while the contribution of organic matter from the continental source rocks is dominant Well 81 is the lowest maturity in Shaanxi Province Maturity is interposed therebetween.