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运用生物标志化合物参数及同位素资料,综合划分北部湾盆地涠西南凹陷原油成因类型和烃源岩供烃组合,认为涠西南凹陷原油可划分为三大类,流沙港组烃源岩在剖面上可划分出2个供烃组合。在此基础上进行油—源精细对比,明确涠西南凹陷流沙港组一段、二段隐蔽油气藏原油的来源,它们分别来自流沙港组烃源岩的不同供烃组合。与此同时,根据隐蔽圈闭与烃源岩的接触关系,提出流沙港组发育有“类构造”和“类岩性”2种独特的隐蔽油气藏成藏模式,二者具有不同成藏特征及成藏主控因素。流沙港组一段、二段隐蔽油气藏在烃源岩、输导体系及成藏模式等方面存在差异。
Based on the biomarker parameters and isotopic data, a comprehensive analysis of the genetic types of source rocks and hydrocarbon source rocks in the southwest depression of Beibu Gulf Basin suggests that the crude oil in the southwest depression can be divided into three major categories. Divided into two for hydrocarbon combinations. On this basis, the oil-source fine correlation is made and the sources of the crude oil in the first and second sub-reservoirs of the Liushagang Formation in the southwestern sag are identified. They are derived from the different hydrocarbon source combinations of the source rocks in the Liushagang Formation. At the same time, according to the contact between the subtle traps and source rocks, two unique subtle reservoir models have been developed with “structural” and “lithologic” features, both of which have Different accumulation characteristics and controlling factors of hydrocarbon accumulation. There are differences in source rocks, transport systems and reservoir-forming models between the first and the second sub-reservoirs of the Liushagang Formation.