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通过对火焰山中央隆起带的石油地质和地球化学特征分析,对该区的稠油成因机理进行了研究。研究发现该区三叠系原油均有25-降藿烷和25,30-双降藿烷的存在,说明这一地区的原油普遍遭受了生物降解作用。其各个地区原油的降解程度也各不相同,其中构造低部位吐玉克地区降解程度相对较弱。英也尔地区原油的生物降解程度较高。流体包裹体的特征表明,在胜金口地区,原油充注时为正常原油,而后发生抬升和生物降解作用,从而形成稠油。玉东1井包裹体显示出现两次原油充注,稠油和正常原油。在鲁8、鲁9、鲁11、鲁2、鲁10井包裹体中,由西向东,随着埋藏深度的变低,第一期和第二期原油的充注逐渐由正常原油变为完全稠油充注。这说明原油可能在运移过程中逐渐稠化。而且鲁10井可能属于当时原油开始稠化时的关键点和开始组分散失与逸散的关键点。
Through the analysis of the petroleum geology and geochemistry of the central Huayingshan uplift belt, the genesis mechanism of heavy oil in this area was studied. The study found that Triassic crude oil in this area have 25-norhopane and 25,30-two hopanes, indicating that the region’s crude oil has generally been subjected to biodegradation. The extent of degradation of crude oil varies from region to region, and the degradation of the lower part of the reservoir is relatively weak. The oil in the area of Inle is more biodegradable. The characteristics of fluid inclusions indicate that crude oil is normal crude oil in the Shengjinkou area and then rises and biodegrades to form heavy oil. The Yudong-1 well shows two crude oil charges, heavy oil and normal crude oil. In the inclusions of Lu 8, Lu 9, Lu 11, Lu 2 and Lu 10, from west to east, as the burial depth becomes lower, the filling of the first phase and the second phase of crude oil gradually changes from normal crude oil to complete Heavy oil filling. This shows that crude oil may gradually thicken during migration. Moreover, well Lu 10 may belong to the key point when the crude oil began to thicken and the key points of the start of component loss and dissipation.