Origin of Condensate Oil/Gas Reservoir: A Case Study in Qijia-Gulong Depression of Songliao Basin
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摘要: 为了阐明齐家-古龙凹陷所发现的凝析油气藏的成因, 结合研究区凝析油气藏所处的地质背景、油油对比认识, 设计进行了原油的热蒸发模拟实验.结果表明, 区内凝析油与下伏的黑油同源, 这暗示了其次生成因; 实验室热蒸发模拟实验支持上部的凝析油为下部黑油的热蒸发作用所产生.这种热蒸发作用可能是通过断层或微裂缝实现的.热蒸发成因将使区内形成大规模的凝析气藏的可能性减小, 勘探的有利目标应该在有利于蒸发作用发生的通道、但目前埋深仍然较大、温压较高的地区.Abstract: In order to elucidate the origin of condensate oil-gas reservoir discovered in Qijia-Gulong depression, a thermal evaporation experiment was designed and carried out based on the knowledge of the geological background of condensate oil-gas reservoir and the oil-oil correlation.The result indicates that the condensate oil and the underlying black-oil are from the same source rock, which hints their secondary origin. The thermal evaporation experiment supports that the condensate oil is from the underlying black-oil by thermal evaporation. This kind of thermal evaporation is possibly realized through faults or micro-fractures. The possibility of forming large-scale condensation gas reservoirs in this area is discounted because of the thermal evaporation origin. Therefore, the advantaged exploration target should be focused on such areas as where there are pathways propitious to thermal evaporation, with deeper bury depth and higher temperature and pressure.
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Key words:
- condensate oil /
- condensate gas /
- thermal evaporation /
- Qijia-Gulong depression /
- simulation experiment
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图 1 英51井不同油层正构烷烃含量对比
Fig. 1. n-alkane distribution correlation of different reservoirs in well Ying 51
图 2 英51井不同油层正构烷烃单体烃碳同位素对比
Fig. 2. Correlation of single hydrocarbon carbon isotope of n-alkane for different reservoirs in well Ying 51
图 3 英51井不同油层色谱指纹对比
Fig. 3. GC fingerprint correlation of different reservoirs in well Ying 51
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