Study on the Migration of Crude Oil in Yan9 Subsection of the Yanan Formation, Maling Oilfield in Ordos Basin, China
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摘要: 我们首次对马岭油田延9油层组原油充注点和运移方向、期次、通道及动力进行了系统地研究。结果表明，马岭油田延9油层组原油中咔唑类化合物的运移分馏效应明显，不同地区原油样品中咔唑类化合物异构体分布特征反映了延9原油具有3个充注点，运移方向为向南东方向和向北西方向运移；纵向上是由下向上，即从延10以下层位向上运移的方向。油藏储层包裹体均一化温度分布呈现出两个主峰温度，说明油气经历了两次运移期和充注期。研究资料显示马岭油田延9油层组原油运移通道在纵向上主要是河道深切谷和延9与延10油层组河道砂体的相互纵向叠置直接接触部位，或者是延10油层组泥岩很薄处形成的油气运移窗口；横向上为联通的多分支河道。油气运移的纵向动力主要为毛细管力和剩余压力。该研究成果对鄂尔多斯盆地侏罗系油气的进一步勘探和开发具有一定的指导意义。
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关键词:
- 鄂尔多斯盆地马岭油田地球化学油气运移
Abstract: The charging and migration direction as well as migration time, pathway and power of crude oil in Yan9 subsection of the Yanan Formation of Maling oilfield in Ordos Basin have been studied for the first time. The migration fractionation of neutral nitrogen compounds in the crude oils indicate that the lateral charging direction of crude oil is from the southeast of the oilfield to the northwest and from the northwest of the oilfield to the southeast. It is also observed by means of the migration fractionation features of neutral nitrogen compounds in the oils that vertical migration direction of crude oil is upward. The homogenization temperature of fluid inclusions in the reservoir exhibits two peak temperatures, reflecting the two stages of migration and accumulation of oil. The migration pathway of oil is river sandstones. The migration power of oil is capillary strength and abnormally high pressure.-
Key words:
- Ordos Basin
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