Source and Accumulation Time of Condensates in Hongzhuang Oilfield, Qintong Sag, North Jiangsu Basin
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摘要: 根据原油和烃源岩中三芳甾烷及甲基三芳甾烷组成特征，结合稳定碳同位素值，分析了苏北盆地溱潼凹陷红庄油田古近系凝析油的油源特征。结果表明，红庄油田凝析油主要来源于溱潼凹陷深部烃源岩，而并非来自于古近系烃源岩。应用储层岩石流体包裹体测试技术，根据油气包裹体特征及盐水包裹体均一化温度，结合地层埋藏史，分析了红庄油田S245井戴一段砂岩储层流体成藏期次。研究表明，与烃类包裹体共生的盐水包裹体均一化温度分布范围主要介于80～110℃，油气充注时期为新近纪中新世晚期，开始充注的时间大约为6 Ma。Abstract: Based on the characteristics of triaromatic steranes, alkyl triaromatic steranes and stable carbon isotopes, the sources of the condensates were analyzed in Paleogene in Hongzhuang Oilfield in Qintong Sag, Northern Jiangsu Basin. It shows that the condensates have not genetic affinity with Paleogene source rocks and were mainly sourced from the deep sources rock in Hongzhuang Oilfield. Based on the characterizations of hydrocarbon inclusions and homogenization temperatures, combining with the strata burial history, the time of hydrocarbon accumulation were confirmed in Ed1 reservoirs in Qintong Sag, North Jiangsu Basin. The result shows that cogenetic aqueous inclusions from quartz in sandstone in Well S245 show homogenization temperatures ranging from 80 to 110 ℃ and petroleum filling began Late Miocene, approximately 6 Ma ago.
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