Characteristics and Main Enrichment Controlling Factors of Chang 7 Tight Oil in Xunyi-Yijun Area,Ordos Basin
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摘要: 利用岩心、测录井、分析化验及试油试采等资料，从岩石学特征、储集性能、流体性质、砂岩分布特征等入手，分析工区内致密油地质特征与富集主控因素。认为工区内延长组长7油层组浊积砂岩发育，属致密储层，储集空间以小孔隙为主；原油性质好，为低密度、低黏度、低凝固点的轻质原油，具有低含硫、可流动性强等特点。同时，长7烃源岩分布广，厚度大，有机质丰度高，类型好，Ro平均为0.78%，已进入成熟阶段，为致密油形成提供了丰富的物质基础；长71和长72亚油层砂岩厚度大、分布广，是致密油富集的关键；断层的发育对致密油富集起破坏作用，良好的保存条件是该区致密油聚集成藏的必要条件。Abstract: Based on the data of core, well logging and oil test, etc, this paper analyzed the characteristics of tight oil and the main enrichment controlling factors of Chang 7 member through the aspects of reservoir distribution, reservoir performance and fluid properties. It is concluded that the turbidite sand body is developed in Chang 7 member and the reservoir space is tight and mainly with small pores; the crude oil has the good properties of low density, low viscosity, low freezing point, low sulfur and strong fluidity. The Chang 7 source rock is rich in organic matter with the average Ro of 0.78%, which provides a rich material basis for the formation of tight oil. The sand bodies of the Chang 71 and Chang 72 sub oil formations are thick and widely distributed, in favour of the accumulation of tight oil. However, the development of faults may destroy the accumulation of tight oil. Good preservation condition is necessary for the accumulation of tight oil in this area.
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