ACCUMULATION CHARACTERISTICS AND EXPLORATION PERSPECTIVE OF THE TIGHT OIL IN SOUTHERN POYANG DEPRESSION
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摘要: 通过对南鄱阳坳陷所发现原油的储层孔渗特征、烃源岩地球化学特征、"源-储"接触关系、原油物理性质及原油显示特征进行分析,初步证明了所发现原油为致密油,确认了南鄱阳坳陷致密油的存在。结合南鄱阳坳陷致密油成藏地质要素、油源对比及流体包裹体成藏年代学研究,揭示了南鄱阳坳陷致密油的主要烃源岩为乐平组老山段含煤泥页岩,致密油为喜马拉雅早期成藏,总结了官山段致密油的成藏过程。在南鄱阳坳陷油气显示特征研究的基础上,初步总结出沉积相、烃源岩及断层为南鄱阳坳陷致密油的成藏主控因素。结合南鄱阳坳陷致密油的成藏条件及主控因素分析,总结了官山段致密油的富集规律,阐述了南鄱阳坳陷具备广阔的致密油勘探前景。Abstract: The integrated study of the reservoir porosity and permeability, the geochemistry of hydrocarbon source rocks, the contact relationship of the source rocks and reservoir, the physical properties of crude oil and the crude oil display characteristics suggests that the crude oil in the southern Poyang Depression is a kind of tight oil. In combination of the geology elements for petroleum accumulation, oil-source correlation and petroleum accumulation geochronology with fluid inclusion, it is revealed that the major source rocks in the Poyang Depression is the coaly shale in the Laoshan Member of the Leping Formation and the tight oil was formed in the early stage of Himalayan. The accumulation process of the tight oil in the Guanshan Member was studied. Based on the study of the display characteristics of oil and gas in southern Poyang Depression, it's believed that sedimentary facies, source rocks and faults are the main control factors for the accumulation of tight oil. The mechanism of enrichment of tight oil in the Guanshan Member is summarized in this paper. All the data bring us to the conclusion that the tight oil has broad exploration prospects in the southern Poyang Depression.
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Key words:
- tight oil /
- southern Poyang Depression /
- accumulation conditions /
- enrichment mechanism
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