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原油甾、萜烷的分布表明 ,QHD32 6 3井明化镇组不同油组的原油来自相同生烃层系 ,但各油组原油色谱特征及芳烃系列化合物组成具有明显的差别。色谱特征的差异主要是第 2期油气的不均衡充注造成的。NmⅠ 油组原油正构烷烃与 2 5 降藿烷共存 ,说明本油组油藏接受了 2期原油注入 ,早期注入的原油遭受了生物降解 ,而后又接受了后期热演化程度较高原油的注入 ;NmⅡ 和NmⅣ 油组原油正构烷烃的缺失及 2 5 降藿烷的检出 ,表明其也遭受了强烈的生物降解 ,但第 2期油气对NmⅡ 和NmⅣ 油组没有影响。芳烃化合物组成的差异是由于各油组生物降解的程度不同所致。NmⅡ油组原油强烈的生物降解与水体的活动有关 ,由此推测其油藏可能为底水油藏 ,而不是以往所认为的边水油藏。
The distribution of crude oestrone and terpane shows that the crude oils of different oil groups in Minghuazhen Formation of QHD32 6 3 well are from the same hydrocarbon generation strata. However, the chromatographic characteristics of crude oil and the composition of aromatics series of each oil group are obviously different. The difference in chromatographic features is mainly caused by the unbalanced charge of the second oil and gas. Nm Ⅰ oil group crude n-alkanes and 2 hopanes coexist, indicating that the reservoir group received two crude oil injection, early injection of crude oil has been biodegraded, and later accepted a high degree of late thermal evolution of crude oil injection The absence of normal paraffins and the detection of nornatanes in NmⅡ and NmⅣ oil reservoirs indicated that they also suffered strong biodegradation. However, the No.2 oil and gas had no effect on NmⅡ and NmⅣ oil groups. The difference in the composition of aromatic compounds is due to the different degrees of biodegradation of the oil groups. The strong biodegradation of crude oil in the NmⅡ oil group is related to the activity of the water body. Therefore, it is presumed that the reservoir may be the bottom water reservoir rather than the previously considered edge water reservoir.